Tax Season Guide: What to File, When to File, What to Gather, and Where People Get Burned

January 16, 2026

Tax season tends to show up the same way each year. A stack of forms lands in your inbox or mailbox, and suddenly you’re trying to remember what changed since last time. A new job. A side gig that actually made money. A brokerage account that had more activity than expected. A retirement distribution. A move. Or that one K 1 that shows up late and turns “I’m filing this weekend” into “maybe next weekend.”

This guide is for that reality. It’s written for W 2 employees, self employed earners, small business owners, high income households, investors who receive K 1s, retirees, and new immigrants filing a US return for the first time. The goal is simple: help you file with fewer surprises by getting clear on what to gather, what to file, when to file, and where people tend to run into problems.

And if tax season feels like more than a filing problem, you’re not imagining it. Taxes connect to cash flow, investing decisions, charitable giving, and retirement withdrawals. That is where planning comes in. If you want to talk through the bigger picture and coordinate that plan with your tax preparer, a fiduciary wealth manager can help. Landsberg Bennett Private Wealth Management works with households on tax aware investing, cash management and cash flow planning, retirement planning, and inter-generational wealth transfer planning.

Note: This content is general information, not individualized tax advice. Filing positions and state rules depend on your facts, so your tax professional should confirm what applies to you.

General Information About 2026 Tax Filing

Tax season goes smoother when you pin down five things early: when the IRS starts accepting returns, when the payment clock matters, what an extension really changes, how quarterly payments work, and what is different for digital assets this year.

1) When can you start filing your 2025 federal return?

January 26, 2026. The IRS announced this as the first day of the 2026 filing season for individual returns.

Practical takeaway: If you have a straightforward W 2 return, filing in late January or early February can be fine. If you are waiting on brokerage packages, K 1s, or corrected forms, filing too early is one of the fastest paths to an amended return.

2) When is the federal deadline?

April 15, 2026 for most calendar year filers. The Form 4868 instructions state this date directly for 2025 calendar year returns, and IRS guidance repeats the April 15 deadline.

What “deadline” means in real terms:

It is the deadline to file your return, or file an extension
It is also the deadline to pay any tax you owe for 2025 if you want to limit penalty and interest exposure

3) If you file an extension, what does it actually do?

An extension gives you more time to file, not more time to pay.

The IRS extension page says the extension is only for filing and you should pay any tax you owe by the April due date. The Form 4868 instructions also say Form 4868 does not extend the time to pay taxes.

Extension reality check

Situation	Extension helps with	Extension does not fix
You are waiting on K 1s or corrected forms	Time to file accurately	Paying late if you owe (IRS)
Your documents are complete but you are behind	Avoids late filing issues if filed on time	Underpayment if you do not pay by April 15 (IRS)
You have complex investing or digital asset activity	Time to reconcile basis and lot detail	Missing records or mismatched totals

What you do if you expect to owe and need an extension:

File the extension by the April due date
Pay an estimated amount by the same date. That is the cleanest way to reduce the “file later, pay later” trap.

4) Estimated tax due dates (common schedule)

If you have income that is not fully covered by withholding, estimated tax can become part of your year. The IRS FAQ lays out the standard due dates tied to the payment periods.

Estimated tax due dates (typical schedule):

April 15 for income earned January 1 to March 31
June 15 for income earned April 1 to May 31
September 15 for income earned June 1 to August 31
January 15 of the following year for income earned September 1 to December 31

Who should pay attention to estimated tax in the real world:

You are self employed, even part time
You sold investments at a gain and withholding is not covering the extra tax
You receive meaningful pass through income (often via K 1)
You take retirement distributions without enough withholding

If you are a high income W 2 household, you can still end up needing estimated payments if bonuses, investment income, or one time transactions are large enough. The trigger is not your job type, it is whether enough tax is being paid during the year.

5) Big change for digital assets: Form 1099 DA is now in play for 2025 activity

This is the year that broker reporting for digital assets starts showing up in a new way.

The IRS says broker reporting on sales and exchanges of digital assets is required on Form 1099 DA beginning with transactions on or after January 1, 2025.
The IRS instructions for Form 1099 DA state that for sales effected in 2025, brokers are not required to report basis information.

Why that matters for your return: If your 1099 DA shows proceeds but does not include basis, your return still needs accurate cost basis to calculate gain or loss. That usually means your own records still matter for 2025 activity, especially if you moved assets between platforms or used self custody.

Digital asset reporting snapshot:

Year of sale	What brokers must report	What you should still verify
2025	Gross proceeds reporting begins (IRS)	Your cost basis and holding detail, because basis may not be reported for 2025 sales (IRS)
2026 and later	Basis reporting expands for certain covered transactions (IRS)	Whether a transaction is covered vs noncovered, plus transfers and lot history

A fast “do this now” checklist (so you do not scramble later)

Circle your filing profile: W 2 only, W 2 plus investing, self employed, K 1, retiree, new immigrant
Make a waiting list: brokerage package, K 1, corrected statements, digital asset exports
Decide your filing timing: early filing only if your documents are complete
If you expect to owe: plan the payment by April 15 even if you file an extension
If estimated tax applies: set reminders around the IRS due dates

1) Your tax season calendar (2026 filing season for 2025 returns)

Tax season gets harder when dates feel vague. Once you anchor the calendar, you stop guessing and start making clean decisions about timing, missing forms, extensions, and payments.

The calendar that actually matters

Date or window	What happens	What you do	Where people get burned
January 26, 2026	IRS begins accepting 2025 federal returns (IRS)	File only if your document stack is complete, including investment activity and any pass through income packages	Filing before brokerage packages or K 1s arrive, then amending later
By Feb 2, 2026	W 2s must be furnished by the employer deadline when Jan 31 falls on a weekend (Social Security)	Check your payroll portal first. If you changed addresses, confirm HR has the right address	Using estimates from paystubs and missing Box detail like local wages or retirement plan codes
February 1 to mid February	Early waves of 1099s show up, but not all 1099 types are due yet	Make a “waiting list” of forms you still need: 1099 B, consolidated brokerage package, K 1, 1099 R, SSA 1099	Filing when you have some 1099s, but not the full set
By Feb 17, 2026	Due date to furnish recipient statements for Forms 1099 B and 1099 DA, including consolidated brokerage statements (IRS)	If you invest in taxable accounts, plan your filing date around when your brokerage issues the consolidated statement	Entering trades from a transaction export, then later seeing a consolidated statement that changes totals
Late February to early March	Brokerages often finalize consolidated tax packages, corrected forms can still happen	Look for language like “final” or “corrected” in your brokerage portal. If you have a lot of transactions, wait for the consolidated package before you lock your numbers	Cost basis issues, wash sale adjustments, foreign tax paid totals, or late corrections
March 16, 2026	Partnerships and S corporations file 2025 calendar year returns and issue K 1s on the business side (IRS)	If you receive K 1s, assume your personal filing can be pushed later. Many K 1 recipients file an extension as a planning move	Filing without the K 1, then reconciling later with an amendment
April 15, 2026	Federal filing and payment deadline for 2025 returns (IRS)	If you cannot file accurately, file an extension and pay what you estimate you owe by this date (IRS)	Confusing “extension to file” with “extension to pay,” then seeing penalty and interest
April 15, June 15, Sept 15, Jan 15	Common estimated tax due dates by payment period (IRS)	If you are self employed, have investment income, or expect a tax bill each year, map these dates now	Underpaying through the year and trying to catch up in April
October 15, 2026	Extension deadline for many individual filers (IRS)	Use the extension window to file cleanly once all forms are final	Using October as an excuse to avoid decisions about payment and documentation

A quick “what filing month fits you” guide

This is not about rushing. It is about matching your situation to your document cycle.

File in late January or early February if:

You are W 2 only, or W 2 plus simple bank interest
You already have your W 2 and any other income statements that apply to you

Aim for mid February through early March if:

You have taxable investment accounts
You want your brokerage consolidated statement before you file, since 1099 B and 1099 DA statements are due to recipients by Feb 17, 2026

Plan for March into April, and consider an extension, if:

You receive K 1s and your K 1 timing is uncertain
Your investing activity is high volume or involves basis complications
You have digital asset activity across multiple platforms, and you need time to reconcile records

The two timing traps that create avoidable rework

Trap 1: Filing before everything is in: This is common if you file as soon as the IRS opens e file. IRS acceptance starts January 26, 2026, but that date is not a signal that your forms are complete. If you invest, your brokerage statements have their own cycle. If you receive K 1s, your timeline is often set by business filings.

Trap 2: Waiting until April and rushing: Rushing tends to produce a specific kind of error: things that are not obvious on a first pass. Capital loss carryovers, wash sale adjustments, basis gaps, missing 1099s, misclassified self employment expenses, and missed state or local withholding detail.

If you are waiting on forms, here is what you can still do in January and February

You can make progress without entering a single number into a tax return.

Build your “missing forms list”: Write down what you still need and who issues it.

Example: W 2 from employer, consolidated 1099 package from brokerage, 1099 R from custodian, SSA 1099 for benefits, K 1 from partnership.

Pull a prior year return and mark carryover items: Capital loss carryover and charitable carryovers tend to move forward. Knowing they exist helps you check your current year entry.
Decide if you are an extension candidate early: If you have K 1s or complicated investment reporting, it is often cleaner to plan on extending and paying what you estimate you owe by April 15, then filing once your final forms are in. The IRS is clear that an extension is time to file, not time to pay.
If you are self employed or have non wage income, map estimated payments now
Quarterly estimated tax due dates follow set payment periods. Put them on your calendar early.

2) What you need to gather (documents that map to the return)

If tax season is a math problem, your documents are the inputs. When the inputs are incomplete, the return gets messy fast. A clean approach is to group documents the same way the return is built: income, deductions and credits, investing, and life events.

Start with this 10 minute setup

Do this before you open any filing software.

Create one folder for each bucket: Income, Deductions and Credits, Investing, Life Events
Create a one page “missing forms list” with three columns: Issuer, Form, Expected date
Pull your prior year return and highlight anything that carries forward: capital loss carryover, prior year charitable carryover, credits, depreciation schedules if you have rentals or a business

Document to return map (with issuer and why it changes your numbers)

What you gather	Who issues it	What it affects	Where it typically lands
W 2	Employer or payroll provider	Wages, withholding, retirement plan entries	Form 1040 wages and withholding
1099 INT	Banks, credit unions, brokers	Interest income	Often Schedule B
1099 DIV	Brokers, mutual funds	Dividend income, qualified dividend detail	Often Schedule B
Consolidated brokerage package, 1099 B detail	Brokerage	Sales proceeds, cost basis, wash sales, capital gains and losses	Form 8949 and Schedule D
K 1	Partnership, S corp, trust, estate	Pass through income, deductions, credits, state information	Often Schedule E plus K 1 attachments
1099 NEC and your income records	Clients, platforms, your bookkeeping	Self employment income	Schedule C plus self employment tax forms
1099 K, platform payout summaries	Payment platforms, marketplaces	Gross receipts reported by platform	Schedule C reconciliation to your records
SSA 1099	Social Security Administration	Social Security benefits reporting	Form 1040 Social Security section
1099 R	IRA custodian, plan administrator	Retirement distributions, withholding, rollover coding	Form 1040 plus supporting forms for rollovers and conversions
HSA contribution and distribution forms	HSA custodian	HSA contribution limits and qualified use	Form 8889
Mortgage interest statement, property tax records	Lender, county, escrow	Itemized deduction inputs	Schedule A
Charitable receipts and written acknowledgments	Charity	Itemized deductions and planning decisions	Schedule A plus planning review
Childcare statements	Daycare provider	Dependent care credit inputs	Schedule 3 and related forms
Education forms and tuition statements	School, loan servicer	Education credits and deductions	Education forms tied to credits
Digital asset activity reports, wallet logs	Exchanges, brokers, your records	Proceeds, basis tracking, gain loss calculation	Form 8949 and Schedule D, plus broker reporting where applicable

What you should gather based on your situation

Pick the list that matches you and build your missing forms list around it.

If you’re W 2 only

W 2
Any bank interest statements
Any education or childcare statements if you plan to claim credits
Prior year return if you expect carryovers

If you have investing activity in a taxable account

Consolidated brokerage tax package, not just a transaction export
Any separate statements for foreign tax paid, if shown
Prior year capital loss carryover detail from your last return
Notes on inherited holdings and account transfers, since basis is where errors happen

If you receive K 1s

K 1 for each entity
Any state pages attached to the K 1
Prior year passive activity carryovers if you have them
A realistic filing plan, since K 1 timing often drives whether you extend

If you’re self employed or run a small business

1099 NEC and 1099 K forms you received
A revenue summary that ties to your bank deposits
Expense categories with receipts or statements, separated from personal spending
A mileage log if you claim vehicle use
A list of software subscriptions, insurance, home office details, and contractor payments if relevant

If you’re retired or taking retirement distributions

SSA 1099
1099 R for each IRA or retirement plan that had a distribution
Any withholding elections you made on distributions
Notes on rollovers and Roth conversions, because codes and timing matter

If you’re a new immigrant filing a US return for the first time

All US income forms you received
Your residency and filing status facts documented for your preparer
Any foreign account and foreign income documentation, if it applies to your situation

Four things people miss, even with good intentions

Cost basis on investment sales: Basis issues are common after account transfers, inherited assets, older lots, or sales involving lots that were not tracked cleanly. Your consolidated brokerage package is usually the right source document, not a spreadsheet export.

Carryovers from prior years: Capital loss carryovers show up more than people expect. Charitable carryovers can also exist if you had a larger giving year. Your prior return is the fastest way to confirm what must carry forward.

Retirement distribution details: Rollovers, Roth conversions, and after tax contributions can be reported correctly on the form but misunderstood in your workflow. If you are unsure what a distribution code means, flag it for your tax professional instead of guessing.

Self employment deductions without clean backup: Estimating expenses is how filings turn into follow up work. Separate business transactions, keep statements and receipts, and keep a short note for anything unusual so you can explain it quickly.

A clean filing workflow you can actually follow

This is the process that reduces rework for investors, K 1 recipients, and self employed earners.

List every issuer before you list every form: Employer, each brokerage, each bank, each platform, each retirement custodian, each K 1 source
Match forms to accounts, not to memory: If you have two brokerages, you usually have two sets of tax packages. Same for retirement accounts and HSAs
Wait for the right version of the brokerage package: Corrected statements are common. If your investing activity is heavy, waiting for the consolidated package helps avoid amendments
Reconcile revenue if you are self employed: Your goal is one number that ties out: gross receipts per your records, supported by deposits and platform summaries
Build a basis file if you invest or have digital assets: Save trade confirmations, transfer history, and any lot detail you need to support gain loss math. Some digital asset broker reporting for 2025 sales may not include basis detail, so your records still matter

3) What to file (Form 1040 plus the schedules that matter)

A federal return is not one form. It is Form 1040 (or 1040 SR for many seniors) plus schedules that explain where your income, deductions, taxes, credits, and payments came from. The IRS instructions for 2025 explicitly point filers to Form 1040 or Form 1040 SR depending on age.

A clean way to think about it is this: Form 1040 is the summary page. The schedules are the proof behind the summary.

The schedule map in plain English

Schedule A: Itemized deductions: This is where deductible medical expenses subject to limits, state and local taxes, mortgage interest, and charitable gifts get tallied when you itemize. The IRS notes you typically pay less federal income tax by taking the larger of itemized deductions or the standard deduction.

Schedule B: Interest and dividends: This is where interest and dividends get detailed when required, and where certain foreign account questions can come into play depending on your facts.

Schedule C: Business income and expenses: This is for sole proprietors and many side gigs. The IRS guidance is clear that an activity generally needs a profit motive and continuity and regularity to qualify as a business for Schedule C reporting.

Schedule D and Form 8949: Capital gains and losses: Schedule D is where your overall capital gain or loss gets calculated. Form 8949 is where you list and reconcile sales and exchanges, especially when amounts reported to you need adjustments. The IRS Schedule D instructions say to complete Form 8949 before certain Schedule D lines.

Schedule E: Rentals and pass through income: This is where rental real estate activity and pass through income from partnerships and S corporations is typically reported, often driven by K 1s.

Schedule 1: Additional income and adjustments: Use it when income or adjustments do not fit directly on Form 1040. The IRS instructions lay out that Schedule 1 Part I totals flow to Form 1040 line 8, and Schedule 1 Part II totals flow to Form 1040 line 10.

Schedule 2: Additional taxes: This is where certain extra taxes live, such as self employment tax and other tax items that do not fit on the front of the return.

Schedule 3: Credits and payments: This is where many credits and payments not shown directly on Form 1040 get captured.

A quick “which schedules apply to you” decision map

Read it like a checklist. If you answer yes, flag the schedule.

You got a W 2 only, plus a small amount of bank interest: Form 1040 may be close to enough. Schedule B might show up if interest and dividends cross certain thresholds or specific conditions apply

You have a side gig or run a small business: Schedule C is in play, and that usually brings self employment tax considerations tied to Schedule SE and additional taxes reflected in Schedule 2

You sold investments in a taxable brokerage account: Schedule D is in play. If you have multiple trades, adjustments, or basis differences, Form 8949 is the workhorse behind the total

You received a K 1: Schedule E is the typical landing spot for partnership and S corporation flow through activity. K 1 detail can also trigger credits, deductions, and state information that must be handled correctly

You own rental property: Schedule E is typically where rental income and expenses are reported. Depreciation and passive activity rules can change how losses show up

You itemize deductions: Schedule A is in play. You are comparing itemized deductions against the standard deduction and taking the larger amount in many cases

You claim credits beyond simple situations: Schedule 3 can be involved, depending on which credits apply

The order that reduces mistakes for investors and K 1 recipients

This is a workflow detail that saves time because it matches how the IRS expects the math to roll up.

Build income schedules first: Schedule C for business income, Schedule E for K 1s and rentals, Schedule B for interest and dividends, plus any other additional income that lands on Schedule 1
Build capital gain reporting next: Form 8949 first, then Schedule D totals, because Schedule D pulls from Form 8949 lines in several places
Decide itemized vs standard deduction after your income picture is stable: Schedule A depends on the final set of deductible expenses and it affects taxable income
Add additional taxes, credits, and payments last: This is where Schedule 2 and Schedule 3 items are finalized, and where withholding and estimated payments get matched to your final tax liability

What wealth managers look for when reviewing the “what to file” list

This is not about filing the return for you. It is about catching planning and cash flow issues that show up through the schedule mix.

If Schedule C shows up: You are in estimated tax territory more often, your retirement contribution options may widen, and your recordkeeping quality becomes part of your tax outcome

If Schedule D and Form 8949 show up: Cost basis accuracy becomes the difference between clean reporting and later corrections. Wash sale adjustments and carryovers also deserve attention

If Schedule E shows up because of K 1s: Timing matters. K 1s often arrive later, and the return may be cleaner with an extension and a planned payment approach

If Schedule A shows up: Charitable giving strategy and the timing of deductible expenses can matter, especially in high income years

“If this is you, this is what matters” (Form 1040 plus the schedules that follow)

Your situation	What usually matters in real terms	What you check before you file	Common forms and schedules
W 2 employee	Withholding accuracy, credit eligibility, standard deduction vs itemizing	Your W 2 boxes match your final paystub, all W 2s are present, any childcare or education forms are in hand	Form 1040 or 1040 SR
High income W 2 household	Underwithholding risk on bonuses, RSUs, side income, investment income coordination, charitable timing	Year end withholding vs your actual tax liability trend, capital gains totals, any pass through income statements, whether you should extend to wait for final packages	Form 1040, Schedule B, Schedule D with Form 8949, Schedule A, Schedule 3
Self employed or side income	Clean revenue and expense categories, estimated tax rhythm, retirement contribution planning tied to business cash flow	Your gross receipts reconcile to deposits and platform payouts, expenses are supported, you have a plan for quarterly payments	Schedule C, self employment tax related forms and additional taxes reflected in Schedule 2, estimated tax workflow
Investor with sales	Cost basis accuracy, wash sale adjustments, carryovers, gain management	You have the consolidated brokerage statement, you reviewed basis for transferred or inherited lots, your prior year capital loss carryover is applied	Form 8949, Schedule D
K 1 recipient	Timing, passive activity limits, state filing spillover, matching K 1 boxes to the correct schedule lines	You have final K 1s for every entity, you reviewed any state pages attached, you are prepared to extend if K 1 timing is late	Schedule E plus K 1 detail attachments
Retiree	Social Security taxation, distribution sequencing, rollover and Roth conversion coding, withholding elections	SSA 1099 and every 1099 R are present, rollovers are documented, you know whether withholding needs adjustment for next year	Form 1040 or 1040 SR, SSA 1099, 1099 R reporting
New immigrant filing a US return for the first time	Residency and filing status facts, first year complexity, foreign account and income reporting exposure	Your residency timeline is documented, your income is categorized by source and date, you flagged any foreign financial accounts for your tax professional	Form 1040 plus specialized reporting depending on facts

Source: About Form 1040, U.S. Individual Income Tax Return

Standard deduction vs itemizing (what to look at for 2025 returns filed in 2026)

A lot of households take the standard deduction because it is larger than itemized deductions. You still want to understand the decision, because itemizing is where planning shows up.

Standard deduction amounts for tax year 2025

For 2025, IRS Form 1040 instructions list the standard deduction as:

$31,500 for married filing jointly or qualifying surviving spouse
$15,750 for single or married filing separately
$23,625 for head of household

The IRS also published that these 2025 amounts reflect amendments connected to the One Big Beautiful Bill.

If you are 65 or older: there is a new senior deduction layer

For 2025 through 2028, people age 65 and older may qualify for an additional $6,000 deduction per eligible individual, with a phaseout based on modified adjusted gross income.
That sits on top of existing age based standard deduction rules, so your tax software or preparer needs the age flags correct.

Itemizing becomes realistic when three things stack up

Itemizing is usually about the total, not one line item.

State and local taxes, but now the cap looks different for 2025: The 2025 Schedule A instructions state the SALT deduction limit increased to $40,000, or $20,000 if married filing separately. It phases down when modified adjusted gross income exceeds $500,000, or $250,000 if married filing separately, and it will not be reduced below $10,000, or $5,000 if married filing separately.
Mortgage interest: Mortgage interest can move the needle if your balance and rate create meaningful annual interest. Your lender statement is the anchor document.
Charitable giving: Charitable deductions generally require itemizing.
If you donate appreciated capital gain property, IRS guidance explains that the deductible amount is generally fair market value in many cases, subject to rules and limits.

A quick way to decide without guesswork

Do this on a scratch sheet before you commit.

Add your capped SALT amount under the 2025 rules
Add mortgage interest from your lender statement
Add charitable contributions you can substantiate and that are eligible under IRS rules
Compare that total to your standard deduction for your filing status

If your itemized total is only slightly higher than the standard deduction, the extra documentation and audit exposure is usually not worth sloppy records. If your itemized total clears the standard deduction by a meaningful margin, documentation becomes the priority.

A charitable planning note that shows up in real portfolios

If you already plan to donate and you hold appreciated positions in a taxable account, donating long term appreciated assets can change the tax math versus donating cash. The IRS rules often allow a deduction based on fair market value for capital gain property, and you may avoid recognizing capital gains that would have been triggered by selling first.

This is not something you decide inside your tax software at midnight. It is a planning choice that belongs on your year round checklist.

4) When you should consider an extension and how to do it cleanly

An extension is a planning move when your return is not ready to be finalized. It can reduce errors when you are waiting on forms that change totals, basis, or reporting categories. It does one thing: it extends the time to file.

The IRS is clear on the key point: an extension gives you more time to file, and you should still pay what you owe by the original due date.

What an extension changes and what it does not change

Here is the straight version.

Extension changes your filing deadline.
Extension does not move the payment deadline for the tax you owe for the year.

That distinction matters because penalty and interest risk is driven by payment timing, not whether the PDF gets uploaded by April.

When an extension is practical

File an extension when the return would be based on incomplete or unstable inputs.

Common situations where an extension is often the clean choice:

You are waiting on one or more K 1s, or you have K 1s that often arrive late.
Your brokerage statement history includes corrected forms, or you have heavy investment sales with basis questions.
You have digital asset activity across multiple platforms and you still need a consolidated gain loss report and clean basis support.
You received a corrected W 2, corrected 1099, or a revised statement that changes totals.
You moved, changed jobs, got married, got divorced, had a child, or had a major shift in income and the paperwork is still settling.

If any of these apply, an extension is less about delay and more about accuracy.

Quick decision check: should you extend

If you answer yes to any of the questions below, an extension deserves a look.

Are you missing any forms that affect income, withholding, or sales reporting.
Do you expect a K 1 that has not arrived.
Did you sell investments and you do not have your consolidated brokerage package in hand.
Do you have digital asset activity and you are still reconciling transfers and lots.
Are you still seeing corrected statements in your accounts.

If you are stable on forms and you have clean records, you can usually file without extending.

How to file an extension cleanly

You’re trying to do two things by the deadline: submit the extension and handle payment planning.

Extension mechanics

File Form 4868 by the filing due date if you need more time.
Keep confirmation that it was accepted if you file electronically.

Payment mechanics

Estimate your total 2025 tax and subtract what you already paid through withholding and any estimated payments.
Pay the estimated balance by the original due date to reduce penalty and interest exposure. The IRS extension guidance says you should estimate and pay any owed amount by the due date.

The “pay first, file later” mindset with real numbers

Here is how this looks in a normal household workflow.

You pull your W 2 withholding total.
You add withholding from any 1099 R distributions.
You add any quarterly estimated payments you already made.
You estimate tax on income that is already known, then you treat missing items like K 1s and late statements as variables.
You make a reasonable payment by the deadline, then you finalize the return once every form is in.

You are not trying to guess perfectly. You are trying to avoid the situation where you file late and pay late.

Extension scenarios people run into

Investor waiting on final brokerage statements: You have capital gains activity and you know your brokerage sometimes issues corrected 1099s. You extend, pay what you estimate you owe, and file once the consolidated package is final.

K 1 household: You receive pass through income and your K 1 timing is unpredictable. You extend, pay based on what you know, then file when the K 1 arrives so your Schedule E reporting matches the issued forms.

Self employed with uneven income: You have business income that swings month to month. You extend if your bookkeeping is not closed, and you use the extension window to clean up revenue and expenses so Schedule C reporting is defensible.

Digital asset activity with transfers: You have transactions across platforms and self custody. You extend while you reconcile transfers and establish cost basis support, especially because 2025 reporting can still require your own records for basis accuracy.

Where a planning conversation helps

Extensions are not just filing mechanics. They are often a signal that something in your tax workflow needs structure.

A planning conversation can focus on:

Withholding adjustments so you do not end up with a surprise bill next April.
Estimated tax cadence that matches your income pattern.
Tax aware investing decisions that manage realized gains and losses.
Charitable planning decisions that consider timing and the type of asset donated.
Retirement tax strategy decisions that affect withholding and taxable income.

If you want help pressure testing your withholding and estimated tax approach for 2026 while you are finishing the 2025 return, book a call with us.

5) Estimated taxes (the part people ignore until it hurts)

Estimated taxes show up when your tax bill is not being covered through withholding. That is not a “small business only” issue. It can hit you if you have investment income, a profitable side gig, a large retirement distribution, or K 1 income that does not come with withholding.

The IRS lays out estimated tax due dates by payment period. The IRS also explains the pay as you go framework and points you to Form 1040 ES and your prior year return as the starting point for calculating payments.

Source: IRS

The IRS “safe harbor” rules people actually use

The underpayment penalty is avoidable when you pay enough tax during the year through withholding and estimated payments. The IRS lists two common safe harbor tests, plus the “owe less than $1,000” threshold.

You may avoid the penalty if:

Your return shows you owe less than $1,000 after subtracting withholding and credits
You paid at least 90% of the tax shown on the return for the current year
You paid 100% of the tax shown on the prior year return, or 110% if prior year AGI was over $150,000 ($75,000 if married filing separately)

This is why wealth managers look at your prior year total tax and your current year withholding trend early. It gives you a target that is grounded in IRS rules, not guesswork.

The practical process that keeps you out of trouble

You do not need to forecast perfectly. You need a repeatable process.

Step 1: Pull two numbers from last year

Total tax from your prior year return
Total federal withholding and estimated payments you made

The IRS explicitly points you to the prior year return and Form 1040 ES worksheet as a guide.

Step 2: Forecast income by bucket

Think in buckets that behave differently for taxes:

Wages (with withholding)
Self employment or business income (usually no withholding unless you set it up)
Investment income (interest, dividends, realized gains)
Retirement income (distributions can have withholding if you elect it)

Step 3: Decide whether to solve the gap with withholding, estimated payments, or both.

Here is how that choice looks in practice.

If your income is mainly from	What tends to work better	Why
W 2 wages plus a predictable side income	Increase W 2 withholding	Withholding is treated as paid throughout the year for penalty purposes in many cases, and it is easier to automate
Self employment or uneven business income	Quarterly estimated payments using Form 1040 ES	The IRS expects pay as you go, and Form 1040 ES is designed for this.
Investment gains that can swing	Combination approach	You can do a mid year projection, then adjust withholding or make a catch up payment based on realized gains
Retiree with IRA distributions	Add withholding on distributions	You can adjust withholding on periodic payments using Form W 4P.

Source: Underpayment of estimated tax by individuals penalty

Step 4: Recheck mid year and again after any big income event

If you sell a large position, close a business deal, or take a large distribution, your tax picture can change quickly. That is the moment to run a quick projection and update your payment plan.

A fast projection method you can use without building a spreadsheet

Use this when you need a clean answer in under 20 minutes.

Take your prior year total tax
Decide which safe harbor target applies to you (90% current year, or 100% or 110% prior year)
Subtract what you expect to pay through withholding for the year
The remaining amount is your estimated payment target across the remaining due dates

If you are late in the year and you are behind, withholding can sometimes catch you up faster than estimated payments because you can change it immediately.

The IRS highlights tools like the Tax Withholding Estimator for adjusting withholding decisions.

What happens if you underpay

Underpaying can trigger the underpayment penalty. The IRS notes that if you did not pay enough through withholding or estimated payments, you may owe a penalty, and the IRS can calculate it for you.

If you need to calculate it yourself because certain conditions apply, Form 2210 is the form used for underpayment of estimated tax. The form instructions also note that many filers do not need to file it because the IRS will compute the penalty.

Three real world scenarios and what you do next

Scenario 1: You’re W 2, but you had a big taxable gain

You sold investments in a taxable account and realized gains were higher than expected. Your paycheck withholding did not change. A mid year check tells you whether you are still within safe harbor based on what you have paid so far. If you are behind, you can make an estimated payment or increase withholding for the rest of the year.

Scenario 2: You’re self employed and income is uneven

You had a strong spring, then a slower summer. Instead of paying the same amount each quarter, you may benefit from aligning payments to the IRS payment periods. The IRS due dates are tied to these payment periods.

Scenario 3: You’re retired and took distributions without withholding

You took IRA distributions and skipped withholding. You can elect withholding on periodic payments using Form W 4P, and you can use Publication 505 for withholding guidance. Read more about our Roth IRA guide.

Where a fiduciary wealth manager fits in

Estimated taxes are a cash flow problem first, then a tax form problem. A fiduciary wealth manager can help you model cash needs across the year, anticipate taxable events tied to portfolio activity, and coordinate with your tax preparer so payment decisions match your broader plan.

If you want to pressure test your withholding and quarterly payment approach for 2026 while you finish the 2025 return, book a call with us.

6) Where to file (without turning this into a software debate)

Where you file is really a risk decision. You’re choosing how much complexity you want to manage yourself, how much you want reviewed, and how much time you want to spend reconciling documents.

You have three routes that cover almost every situation.

Route 1: Self prepared filing

This fits when your return is stable, your documents are complete, and you can explain every number on the screen using a form in your folder.

Self prepared filing tends to work well if:

Your income is mainly W 2, plus modest interest or dividends
You did not sell a lot of investments
You do not have K 1s, rentals, or multi state issues

Self prepared filing starts to get risky when:

You have heavy investment sales and need cost basis and wash sale detail
You have digital asset activity across multiple platforms and need a clean gain loss file
You have side income where revenue and expenses need a real bookkeeping trail

The risk is not “getting audited.” The risk is filing numbers that do not reconcile to the forms you received, then fixing it later when a corrected statement arrives.

Route 2: A paid tax preparer (CPA, enrolled agent, or attorney)

This is worth considering when the schedule mix expands beyond a simple W 2 return.

The IRS points taxpayers to practical steps for choosing a tax professional, including using the IRS preparer directory and checking credentials.
The IRS also notes that paid preparers are required to have a valid PTIN and sign the return, and not signing is a red flag.

Use a preparer if you have:

K 1 income, rentals, or multi state reporting
A year with large realized gains, complex basis, or a lot of 1099 B entries
Self employment income that needs clean Schedule C treatment
A first year US filing situation with residency and foreign reporting questions

Route 3: Hybrid (you organize, a professional reviews or files)

This is the route that often makes sense for households who want accuracy without outsourcing every step.

Hybrid usually looks like:

You build the document stack and a summary sheet
You reconcile totals to the forms
The preparer reviews, makes technical calls, and files

Hybrid can reduce prep cost and back and forth because you’re not paying someone to chase missing paperwork.

A simple “pick your route” table

Your return profile	What tends to break under pressure	Route that usually fits
W 2 only, no investing sales	Missing a form, wrong withholding entry	Self prepared or hybrid
W 2 plus investment sales	Basis gaps, wash sale adjustments, corrected 1099s	Hybrid or preparer
K 1 income	Late arriving K 1, state pages, passive activity limits	Preparer or hybrid
Self employed	Revenue reconciliation, expense documentation, estimated tax planning	Preparer or hybrid
Retiree with distributions	1099 R coding, withholding choices, Social Security reporting	Hybrid or preparer
New immigrant first year	Residency facts, foreign reporting exposure, documentation trail	Preparer

7) State notes with a Florida focus (and nearby state awareness)

You can do everything “right” on the federal side and still get tripped up at the state level, usually because income and withholding do not line up with where you actually lived or worked.

The Florida anchor

Florida does not have a state personal income tax. That changes your tax season workflow in a very specific way: you are usually filing only the federal return unless you have income sourced to another state.

What Florida does not change:

You still have a federal filing obligation when your income requires it
You still need to track withholding, estimated payments, and taxable investing activity the same way you would in any state
If you earn income sourced to another state, you may have to file a nonresident return there based on that state’s rules

A Florida planning nuance that catches people: if you pay income tax to another state as a Florida resident, there is no Florida resident return that gives you a “credit for taxes paid to another state.” That can make withholding setup and quarterly payment planning more important when you have cross state income.

The clean way to spot a state filing issue in under 3 minutes

Check these items before you assume “Florida means no state return.”

Look at your W 2, box 15 through 17: If you see a state abbreviation and state withholding for a state that is not Florida, that is your first flag that a state return may be needed
Look at your K 1 state pages: K 1 packages often include state sourced income detail or composite filing notes, especially when the entity operates in multiple states
Look at rental addresses and business locations: Rents and business activity tied to a state often create a nonresident filing obligation in that state, even if you live in Florida
Look at withholding that continued after you moved: A common issue is changing jobs or relocating and payroll withholding stays in the old state longer than it should

Nearby states quick reference table

State	Individual income tax note	Practical tax season impact
Florida	No state personal income tax (AARP States)	Your state return load is usually zero unless you have income sourced to another state
Georgia	Flat rate change: effective July 1, 2025 the rate is 5.19%, with other updates like standard deduction changes and personal exemption repeal except a dependent exemption (Department of Revenue)	If you worked in Georgia, had Georgia sourced income, or received flow through income tied to Georgia, you may need a Georgia filing even if you live in Florida (Department of Revenue)
Alabama	Progressive rates that top out at 5% (Alabama Department of Revenue)	Alabama sourced wages, business income, or property income can require a nonresident return (Alabama Department of Revenue)
South Carolina	South Carolina DOR notes the 2025 top marginal individual income tax rate is 6% (South Carolina Department of Revenue)	If you have South Carolina sourced wages or pass through income, confirm whether a return is required and whether withholding matches your situation
North Carolina	Flat individual income tax rate of 4.25% for taxable years beginning in 2025 (NCDOR)	Remote work and job changes often create withholding mismatches if payroll does not switch to the right state quickly
Mississippi	Tax year 2025: excess of $10,000 of taxable income is taxed at 4.4% per Mississippi DOR (dor.ms.gov)	If you have Mississippi sourced income, you may have a filing obligation even when you live elsewhere

If you live in Florida but earned income in Georgia or Alabama

This is where people get surprised because they assume “no state tax” means “no state returns.”

Georgia: Georgia DOR states that nonresidents who work in Georgia or receive income from Georgia sources and are required to file a federal return are required to file a Georgia Form 500. Georgia also gives examples of Georgia source income such as wages, Georgia Lottery winnings, flow through entity income, and rents.

Alabama: Alabama DOR states that nonresident individuals receiving taxable income from property owned or business transacted in Alabama, including wages for personal services, should file a Nonresident Individual Income Tax Return, Form 40NR.

Practical takeaway

If you have Florida residency and Georgia or Alabama source income, you are often solving two separate problems:

Filing the nonresident return accurately
Fixing withholding or estimated payments so next year does not produce a large balance due

Two state level problems that show up in real households

Payroll withholding is in the wrong state

You moved or switched to remote work and payroll kept withholding for the prior state. You can end up filing a nonresident return to recover over withholding, plus another state return if required based on where you lived and worked

K 1 spillover into multiple states

You receive a K 1 and suddenly you have state source amounts in several states. Sometimes there is entity withholding, sometimes there is composite filing, sometimes there is nothing. This is where your K 1 detail pages matter as much as the federal numbers

Planning angle that actually helps

If your state footprint is more than Florida, the planning work is usually about:

Getting withholding pointed to the correct state while the year is still in progress
Setting estimated payments when income does not have withholding attached
Managing the timing of taxable portfolio activity when you know a nonresident return will apply

8) Crypto and digital assets: what changed, and what you should do now

Here is the key development that affects 2025 activity filed in 2026.

The Treasury and IRS issued final regulations and related guidance requiring brokers to report certain digital asset dispositions, with Form 1099 DA beginning for transactions on or after January 1, 2025.

The IRS Form 1099 DA instructions also make an important transitional point: for sales effected in 2025, brokers are not required to report basis information, and broader basis reporting ramps in later years.

Source: Final regulations and related IRS guidance for reporting by brokers on sales and exchanges of digital assets

What that means in practice for you

You may receive reporting that shows proceeds without full basis detail for 2025 activity, depending on platform and transaction type.
Your own records still matter for gain and loss accuracy.
If you moved assets between platforms or wallets, you should keep transfer notes so you can reconcile acquisitions, units, and disposal lots.

Your minimum recordkeeping checklist for digital assets

Date acquired and date sold
Units, proceeds, fees
How you acquired it (purchase, transfer, reward, other)
Any transfers between wallets or platforms
Documentation you can share with a preparer

This is a place where a coordinated plan helps. If you have meaningful investment activity across taxable accounts and digital assets, the conversation is not only “report it correctly,” it is also “how do gains interact with your broader tax picture.”

9) Where people get burned (the recurring issues that cost money or time)

These are the spots that repeatedly create amended returns, surprise tax bills, or planning regret.

1) Filing too early when you still have missing inputs

K 1 timing, brokerage corrections, and complex investment activity can make early filing risky. Filing early is not “wrong,” it just needs complete data.

2) Underwithholding plus no estimated tax plan

If your income has shifted from wages to business or investment income, withholding might not cover the bill. The IRS estimated tax schedule is clear, and missing it can create penalties and a cash crunch.

3) Cost basis mistakes, especially after transfers or inheritance

Basis errors are common after account transfers, inherited holdings, or missing acquisition detail. This changes capital gains tax.

4) Charitable giving that is generous but not structured

You can support causes you care about and still be deliberate about timing and asset selection. Donating appreciated assets is one planning approach that can reduce capital gains exposure.

5) Retirement distributions done without a tax plan

Retirement income choices often trigger ripple effects, including Social Security taxation and bracket management. Landsberg Bennett’s retirement and tax strategy content speaks to this planning lens.

10) How a fiduciary wealth manager helps during tax season (without preparing your return)

Tax season has a way of turning into a single question: “What do you need to file?”

A fiduciary wealth manager usually hears a different question underneath it: “Are you paying the right amount through the year, and are you making decisions that create avoidable tax friction?”

That is the lane. Not preparing the return. Not replacing your CPA or tax preparer. Helping you connect the filing inputs to the plan you’re actually living.

What that looks like in real life

You’re not coming in with a vague goal like “lower taxes.” You’re coming in with specific situations that repeat in higher income households, investors, retirees, and people with side income.

A few examples:

You sold positions in a taxable account and you’re not sure how much of the tax bill is locked in versus manageable.
You received a bonus or RSUs and withholding did not keep up.
You have K 1 income and your cash flow does not match when taxes are due.
You’re taking retirement distributions and the tax impact feels unpredictable.
You donate each year, but the donation method and timing has not been reviewed against your capital gains picture.

The five areas where planning changes outcomes

1) Tax aware investing and gain management

This is about controlling the tax character of what you sell and when you sell it.

Reviewing realized gains and losses year to date
Checking cost basis and lot selection issues before a sale becomes final
Using losses to offset gains where the rules allow
Avoiding accidental wash sale issues when you harvest losses and then buy back too quickly

If you have a taxable brokerage account, this is often the difference between a surprise April bill and a planned outcome.

2) Cash flow planning for taxes, withholding, and quarterly payments

A lot of households get hit because tax payments are treated like an annual event instead of a year round cash flow line item.

Comparing current year withholding pace versus a realistic year end tax target
Deciding whether to solve a gap through W 2 withholding changes, withholding on retirement distributions, quarterly estimated payments, or a mix
Setting a calendar for the April, June, September, and January estimated tax deadlines when they apply

This is not busywork. It is how you avoid underpayment issues and avoid scrambling for cash in April.

3) Charitable planning that connects to your portfolio

If giving is part of your life, the tax impact depends on what you give and when you give it.

Determining whether you are itemizing or taking the standard deduction for the year
Reviewing whether donating appreciated assets makes sense versus donating cash
Timing gifts in a year when you have large realized gains or elevated income

The planning value is not the receipt. It is the structure.

4) Retirement tax strategy that respects sequencing

Retirement is where tax strategy becomes sequencing.

Deciding which accounts to draw from first in a way that manages brackets
Coordinating Social Security with withdrawals so you understand how benefits are taxed
Reviewing Roth conversions as a multi year strategy, not a single year impulse
Setting withholding on distributions so quarterly payments are not a constant problem

This is where tax season becomes a planning season, because the decisions compound over years.

5) Inter generational and beneficiary planning that avoids tax surprises

This part shows up when accounts and beneficiaries are not aligned with the current plan.

Reviewing beneficiary designations across retirement accounts and insurance
Coordinating ownership and titling where it affects taxes and settlement
Checking how future distributions may land across family members, especially when there are multiple heirs or trust structures involved

It is hard to fix this in April. It is manageable when reviewed intentionally.

What to bring to a tax season planning call

If you want the conversation to be concrete, bring these items:

Your prior year return
Your latest paystub or your latest retirement distribution statement
Your brokerage year to date realized gains and losses report
A list of expected K 1s if applicable
A short note on any life changes: job change, move, marriage, divorce, new child, sale of property, new business income

That set of inputs is enough to have a real planning discussion.

The type of questions you should expect in the call

If you hear questions like these, you’re in a planning conversation, not a filing intake.

What taxable events already happened this year, and what might still happen.
What is your withholding pace versus your likely year end liability.
Which accounts are driving taxes, and which are driving cash flow.
Are you donating regularly, and what assets are funding those gifts.
What retirement distributions are planned this year, and what is being withheld.

FAQ

Do you have to file a tax return?

It depends on filing status, age, and income type. Even if you are below a filing threshold, filing can still be useful if you had withholding, refundable credits, or you need to document tax compliance for other reasons. A tax professional can confirm your specific filing requirement.

If you file an extension, do you get more time to pay?

No. An extension generally gives more time to file paperwork, while payment timing still matters for penalties and interest.

When do estimated tax payments apply?

Estimated taxes often apply when you have income not covered by withholding, such as self employment income or investment income. The IRS due date schedule is typically April 15, June 15, September 15, and January 15.

What is Form 1099 DA and why does it matter?

Form 1099 DA is part of the broker reporting framework for certain digital asset sales and exchanges beginning with transactions on or after January 1, 2025.

When should you wait to file?

If you are still waiting for K 1s, corrected brokerage forms, or consolidated digital asset transaction detail, waiting can reduce the chance of amending later.

Conclusion

Tax season gets easier when you treat it as a process, not a sprint. You now have a clean framework for filing 2025 taxes in 2026: lock the calendar, gather documents that map to Form 1040 and the schedules, decide early if an extension is the clean move, and set a plan for withholding and estimated payments before April forces the issue.

If you live in Florida, the lack of state income tax simplifies one piece of the puzzle, but out of state income can still create state filing and withholding problems that deserve attention. If your return includes investing activity, K 1s, self employment income, or retirement distributions, the filing is only part of the story.

The bigger opportunity is aligning tax decisions with your cash flow, portfolio actions, charitable giving, and retirement strategy so you can avoid preventable surprises and make choices with clarity.