How to File a US Tax Return in 2026: Step by Step

Two things trip people up every filing season, and neither is complicated once said plainly. The first: Form 4868 is an extension of time to file, not an extension of time to pay. People file the extension, relax, and discover in October that the failure-to-pay penalty and interest have been accruing since April. The second is newer. Paper refund cheques to individuals have essentially stopped — the Internal Revenue Service generally ceased issuing them after 30 September 2025 under Executive Order 14247. The bank details box on your return is no longer optional housekeeping. It is how you get your money.

Filing a US return is a sequence, and the sequence matters. Decide whether you must file. Pick your filing status, which is the single highest-leverage choice on the form. Collect the documents, which arrive on a known timetable. Pick the right 1040. Send it electronically. Pay what you owe by 15 April whatever else happens. Then watch for the refund or the notice.

This guide walks that sequence for the tax year 2025 return, due 15 April 2026, with the tax year 2026 figures flagged where they differ. Returns filed in early 2026 are tax year 2025 returns. Every figure below carries its year.

Who this guide is for

• First-time filers who want the order of operations rather than a glossary
• Freelancers with net self-employment earnings over the US$400 threshold
• Anyone who has previously filed on paper and is being pushed to e-file
• People who usually get a refund by post and have not noticed that route closing
• Married couples deciding between joint and separate, which is a bigger decision than it looks
• Anyone who filed and then realised something was missing
• Taxpayers aged 65 or over, who have a form option most people do not know exists

Quick answer

The tax year 2025 return is due 15 April 2026. Form 4868 gives an automatic six-month extension to 15 October 2026, to file only — pay your estimate by 15 April or the 0.5%-per-month failure-to-pay penalty and 7% interest begin. Choose your filing status first, because it sets your standard deduction (tax year 2025: US$15,750 single or married filing separately, US$31,500 married filing jointly or qualifying surviving spouse, US$23,625 head of household) and your bracket thresholds. Most of your documents arrive by 2 February 2026, with Form 1099-B and Form 1099-DA on 17 February 2026. Use Form 1040 if you are a citizen or resident alien, Form 1040-NR if you are a nonresident alien, or optionally Form 1040-SR if you are 65 or older. E-file. Give bank details, because paper refund cheques to individuals generally stopped after 30 September 2025 under Executive Order 14247. If you owe, pay by Direct Pay with a US routing number or by card for a fee — EFTPS has closed to new individual enrolments. If you got something wrong, amend on Form 1040-X.

Who must file

There are three separate questions here and people collapse them into one.

Does your income reach the threshold? The Internal Revenue Service publishes gross-income filing thresholds by filing status and age in the Form 1040 instructions, and they move each year. Check them there rather than relying on a remembered number.

Do you have self-employment income? If your net self-employment earnings reach US$400, you must file. That threshold is not indexed and has not moved. It is low enough that a modest side income creates an obligation on its own, independent of the general income threshold.

Are you a US citizen or resident alien living abroad? Then you file Form 1040 like anyone else. Living outside the United States does not remove the obligation; it changes the deadline and adds forms.

Separately, two reporting duties sit alongside the return and are easy to miss. The FBAR — FinCEN Form 114 — is required if your foreign financial accounts aggregated over US$10,000 at any time during the year, not at year end, and it is filed electronically through the FinCEN BSA E-Filing System separately from your return. Form 8938 under FATCA is filed with the return, at thresholds starting at over US$50,000 at year end or over US$75,000 at any point for an unmarried filer living in the United States. Neither replaces the other.

And one question everyone must answer regardless of anything else: the digital asset question on Form 1040. You answer it whether or not you transacted.

Choosing your filing status

This is the highest-leverage decision on the form, and it is made before any arithmetic happens. Status sets your standard deduction, your bracket thresholds, your phase-out thresholds and, in several cases, your eligibility for specific deductions outright.

Three things follow from that table that are not obvious from it.

Married filing separately is rarely a saving. Each spouse gets the single standard deduction, and the bracket thresholds are tighter than half the joint ones at the top. For tax year 2026 the married-filing-separately 37% threshold is US$384,350. Separate filing also disqualifies you from the new tips and overtime deductions, which require a joint return if you are married.

Head of household is worth checking carefully. The difference between single and head of household for tax year 2025 is US$7,875 of extra standard deduction, and the tax year 2026 brackets are wider all the way up — 12% starts at US$17,700 rather than US$12,400, and 22% at US$67,450 rather than US$50,400. If you maintain a home for a qualifying person, work out whether you qualify rather than defaulting to single.

Qualifying surviving spouse gets joint-level treatment. The standard deduction matches married filing jointly. It is a time-limited status with conditions, and it is the one people most often fail to claim when they are entitled to it.

If you are 65 or older or blind, add the age or blindness amount on top — US$1,600 per condition for tax year 2025 (US$2,000 if unmarried and not a surviving spouse), rising to US$1,650 and US$2,050 for tax year 2026. The conditions stack.

Gathering your documents

Your documents arrive on a published timetable. Filing before they land is how returns get amended.

The 31 January deadline falls on a Saturday in 2026, hence 2 February. The mid-February deadline moves to 17 February because 15 February is a Sunday and 16 February is Washington's Birthday.

Two thresholds are worth knowing because they explain documents that never arrive. Form 1099-K is only issued if your business transactions exceeded US$20,000 and more than 200 transactions — both conditions, not either. And the 1099-NEC and 1099-MISC threshold rises from US$600 to US$2,000 for tax year 2026, so next year you will receive fewer of them. In both cases the income is still reportable. A missing information return is not a missing tax liability.

Form 1099-DA is new. For 2025, brokers may report your cost basis but are not required to, so the figure may simply be absent and you will need your own records.

Picking the right form and sending it

Three forms, one choice.

Form 1040 is for US citizens and resident aliens, including those living abroad. This is most people.

Form 1040-NR is for nonresident alien individuals, estates and trusts.

Form 1040-SR is an optional alternative to Form 1040 if you are 65 or older. Larger print, the same schedules, and — this is the part people get wrong — no income restriction. It is not a simplified form for small incomes. It is the same return, set in bigger type.

The tax year 2025 Form 1040 has been redesigned, so do not pattern-match from memory. Dependents now sit in numbered rows. Several items that used to be hand-written write-ins have dedicated checkboxes. There is a deceased box with a date field. And there is a new checkbox asking whether your main home was in the United States for over half of 2025, which affects the earned income credit.

On e-file versus paper: e-file. Electronic filing gets you validation before submission, a confirmed receipt, and faster processing. Paper is still accepted but it is slow, it is the route where transcription errors enter, and the wider direction of travel under Executive Order 14247 is away from paper in both directions. If you are filing a pro forma Form 1120 with Form 5472 attached for a foreign-owned US disregarded entity, note that one cannot be e-filed at all — it goes by fax or post to a dedicated address.

How refunds work now — Executive Order 14247

This is the practical change most likely to catch a returning filer, so it gets its own section.

Under Executive Order 14247, the Internal Revenue Service generally stopped issuing paper refund cheques to individuals after 30 September 2025. If your mental model of filing ends with a cheque arriving in the post, update it. Refunds are now electronic.

What that means in practice:

The bank details on your return are load-bearing. Routing number and account number, entered correctly, are now the mechanism by which you are paid. Transpose a digit and you have a problem that is slow to unwind. Check them against a statement, not from memory.

If you do not have a US bank account, solve that before you file, not after. This hits US citizens living abroad hardest. A foreign account will not generally take a domestic electronic refund, and the paper fallback has gone.

Payment in the other direction is moving the same way. EFTPS stopped taking new individual enrolments after 17 October 2025 and the Internal Revenue Service says it "will be sunset for individuals later in 2026." Paper cheques and money orders to the Internal Revenue Service are still accepted "for now" but are being phased down under the same order.

So if you owe, the realistic electronic options are:

• IRS Direct Pay — free, no sign-in required, and you can change or cancel within two days. It requires a US routing number.
• Debit or credit card through an authorised processor, for a fee. Pay1040: US$2.15 flat for debit, 1.75% consumer credit with a US$2.50 minimum, 2.89% commercial. ACI Payments: US$2.10 debit, 1.85% consumer credit with a US$2.50 minimum, 2.95% commercial. Figures as published when the Internal Revenue Service page was reviewed on 24 September 2026.

One honest gap: the Internal Revenue Service does not state whether foreign-issued cards are accepted by its processors. Do not assume either way; test a small payment or contact the processor.

Filing, step by step

1. Confirm you must file. General threshold in the Form 1040 instructions; US$400 of net self-employment earnings on its own; always if you are a citizen or resident alien, wherever you live.
2. Choose your filing status. Do this before anything else. It sets the standard deduction and every threshold downstream.
3. Wait for your documents. Most by 2 February 2026, Forms 1099-B and 1099-DA by 17 February 2026.
4. Pick your form. Form 1040, Form 1040-NR, or Form 1040-SR if you are 65 or older.
5. Compare standard deduction against itemising. With the state and local tax cap at US$40,000 for tax year 2025 (US$40,400 for tax year 2026, with reduction starting above US$505,000 of modified adjusted gross income), itemising is viable again for many filers.
6. Check Schedule 1-A. Tips, overtime, car loan interest and the senior deduction are claimable whether or not you itemise.
7. Answer the digital asset question. Mandatory regardless of your answer.
8. Enter your bank details and verify them. This is how you get a refund now.
9. E-file, and keep the acknowledgement.
10. Pay anything owed by 15 April 2026, even if you are extending the filing deadline.
11. If you need more time to file, submit Form 4868 for an automatic extension to 15 October 2026 — and pay your estimate anyway.

Mistakes that cost money

Treating Form 4868 as an extension to pay. It is not. Failure to pay runs at 0.5% per month to a 25% maximum, and interest on individual underpayments is 7% as of the fourth quarter of 2026. Both start from 15 April.

Not filing because you cannot pay. This is backwards. Failure to file is 5% per month to a 25% maximum — ten times the monthly rate of failure to pay. When both apply, the failure-to-file penalty is reduced by the failure-to-pay penalty, giving a combined 5% per month for five months and then 0.5% continuing alone. File on time, pay what you can, arrange the rest.

Filing before Form 1099-B arrives. It is due 17 February 2026, not 2 February. Anyone with a brokerage account who files in early February is likely to be amending.

Assuming no document means no income. The 1099-K threshold of US$20,000 and 200 transactions, and the 1099-NEC threshold rising to US$2,000 for tax year 2026, mean plenty of real income arrives unreported to you. It is still reportable by you.

Entering bank details carelessly. With paper refund cheques to individuals gone, a wrong account number is no longer a minor error with a fallback.

Defaulting to single when head of household applies. US$7,875 of extra standard deduction for tax year 2025, plus wider brackets. Worth ten minutes of checking.

Choosing married filing separately without running the numbers. It usually costs more and it disqualifies you from the tips and overtime deductions.

Ignoring estimated tax. If you expect to owe US$1,000 or more and your withholding is below the safe harbour, instalments are due 15 April 2026, 15 June 2026, 15 September 2026 and 15 January 2027. The safe harbour is the smaller of 90% of current-year tax or 100% of prior-year tax, rising to 110% if prior-year adjusted gross income exceeded US$150,000, or US$75,000 married filing separately.

After you file, and amending

An e-filed return gives you an acknowledgement. Keep it — it is your proof of timely filing, and the date on it is what matters if a penalty question arises later.

If the Internal Revenue Service disagrees with something, you get a notice rather than a phone call. Read the notice number, respond by the date on it, and do not ignore it on the assumption it will resolve itself. Under an approved installment agreement the failure-to-pay rate drops to 0.25% per month; after a notice of intent to levy it rises to 1% per month. That spread is the reason to engage early.

If you find an error after filing, amend on Form 1040-X. Amend for anything that changes your tax, your filing status, your dependents or your income — a late Form 1099-B, a missed Schedule 1-A deduction, a status you were entitled to and did not claim. Do not amend for arithmetic the Internal Revenue Service will correct itself. There is a time limit on claiming a refund through an amended return; check the current limit on the Internal Revenue Service's own pages before assuming an old year is still open.

Disclaimer

This guide describes general federal filing procedure and figures as published by the Internal Revenue Service. It is information, not tax advice. It does not cover state filing, which has its own forms, deadlines and rules, and it does not cover business entity returns beyond the Form 5472 point noted above. Figures are labelled by tax year and were checked on 12 October 2026; both the OBBBA changes and Executive Order 14247 took effect recently and implementation detail is still settling. If your return involves foreign income, equity compensation, a business or a contested notice, use a licensed preparer or an enrolled agent.

The short version

Status first, documents second, form third, payment always by 15 April. Those four in that order will keep you out of most trouble. The extension on Form 4868 is real and automatic and takes you to 15 October 2026, but it touches only the filing obligation. Everything you owe was due in April, and the meter — 0.5% per month plus 7% interest — runs from there.

The change to internalise this year is the refund. Paper cheques to individuals generally ended after 30 September 2025, so the bank details field has gone from convenience to necessity. If you live abroad, or if you have been meaning to sort out a US account, do it before you file rather than after. The same direction of travel applies to paying: EFTPS has closed to new individual users and is being sunset during 2026, leaving Direct Pay with a US routing number as the free route and card payment at 1.75% to 2.95% as the paid one.

And if something is wrong, amend it. Form 1040-X exists precisely because returns are filed with incomplete information and people discover better numbers afterwards. A corrected return filed voluntarily is a smaller problem than an uncorrected one found later.