How to File Your Own Tax Return: Form 1040, Deadlines, and Refunds

To file your own tax return, you gather your income and deduction paperwork, choose a filing status, complete Form 1040, and send it to the IRS by April 15, 2026 for the 2025 tax year.¹ Most of the work is document gathering, not math. If your adjusted gross income is $89,000 or less, the IRS Free File program hands you guided software that does the calculations and e-files the return for free.²

Gather Your Documents First

Before you open any tax form, pull together the paperwork the return will ask for. Start with Social Security numbers for yourself, your spouse if you’re filing jointly, and every dependent you plan to claim. A wrong or duplicated SSN causes the IRS to reject an e-filed return outright.³ If someone on the return doesn’t have an SSN, you’ll use an Individual Taxpayer Identification Number instead.

Income Forms

Your employer must send you a W-2 by January 31 showing wages and taxes withheld.⁴ Income outside a regular paycheck arrives on 1099s:

Form 1099-NEC for freelance, contract, or gig work of $600 or more.⁵
Form 1099-INT for interest from bank accounts and CDs.⁶
Form 1099-DIV for dividends from stocks and mutual funds.
Form 1099-B for proceeds from selling investments.

The IRS receives copies of every one of these. Its automated matching system flags any return where the reported income doesn’t line up with what payers reported, so leaving off a small 1099 is a reliable way to trigger a notice.

Deduction and Credit Records

If you want to reduce your taxable income or claim credits, pull the records that support the claim. Student loan interest shows up on Form 1098-E from your servicer.⁷⁸⁹ For education credits you’ll need Form 1098-T from the school.¹⁰ For the childcare credit, keep receipts along with the provider’s name, address, and taxpayer ID. If you plan to itemize, you’ll also want mortgage interest statements, property tax bills, and records of charitable donations.

Pick Your Filing Status

Your filing status sets the tax rates that apply to your income and the size of your standard deduction. The IRS looks at your marital and household situation on December 31 of the tax year.¹¹ There are five choices:

Single: unmarried, divorced, or legally separated with no dependents who qualify you for Head of Household.
Married Filing Jointly: you and your spouse combine income on one return, which usually produces the lowest combined tax.
Married Filing Separately: each spouse files their own return. Useful in narrow situations, such as when one spouse has heavy medical expenses or income-driven student loan concerns.
Head of Household: unmarried and paying more than half the cost of keeping up a home for a qualifying dependent. Gives you wider brackets and a bigger standard deduction than Single.
Qualifying Surviving Spouse: available for two years after a spouse’s death if you have a dependent child, and uses the same brackets as Married Filing Jointly.

Head of Household is where people slip up most often. Being single with kids isn’t enough; you must actually pay more than half of the household costs. Pick the status that fits your legal situation, not the one with the friendliest brackets.

Standard Deduction or Itemize?

After choosing a status, you’ll subtract either the standard deduction or your itemized deductions from your adjusted gross income to get taxable income. For tax year 2025, the standard deduction is:

$15,750 for Single or Married Filing Separately
$31,500 for Married Filing Jointly or Qualifying Surviving Spouse
$23,625 for Head of Household

Those amounts rise for tax year 2026 to $16,100, $32,200, and $24,150 respectively.¹²

Itemizing only helps if your deductible expenses beat the standard deduction. Add up mortgage interest, charitable gifts, and state and local taxes you paid, then compare. If itemizing doesn’t clearly win, take the standard deduction and skip the recordkeeping. Two caps to keep in mind if you’re close: state and local taxes are limited to $40,000 per return ($20,000 if Married Filing Separately) for tax year 2025, and medical expenses are deductible only above 7.5% of your AGI.¹³

Free Ways to Prepare the Return

You don’t have to pay for software. IRS Free File partners with private tax companies to offer free federal preparation and e-filing to anyone with an AGI of $89,000 or less.² Above that income, Free File Fillable Forms are available: electronic versions of the paper forms with basic math built in but no guided interview.

The Volunteer Income Tax Assistance (VITA) program offers free in-person help to people earning about $67,000 or less, people with disabilities, and taxpayers with limited English. Tax Counseling for the Elderly (TCE) does the same for anyone age 60 and older. Both run out of libraries, community centers, and similar sites during filing season.

Filling Out Form 1040

Form 1040 is the standard individual return, and you can download it from the IRS or work through it inside any tax software.¹⁴ It walks through the calculation in order.

Income and Adjustments

Enter your personal information, filing status, and dependents at the top. Then add up every income source: wages from W-2s, freelance income from 1099-NECs, interest, dividends, capital gains, and anything else. That total is gross income. Subtract “above-the-line” adjustments such as student loan interest, educator expenses, and deductible IRA contributions to get your Adjusted Gross Income. AGI is the number that matters most on the return because it controls eligibility for many credits and deductions.

Taxable Income and the Tax Itself

Subtract your standard deduction or itemized deductions from AGI. If you have qualifying self-employment or small-business income, you may also get the qualified business income deduction, worth up to 20% of that income. What’s left is your taxable income, and that’s what runs through the tax brackets.

Federal rates for 2025 run from 10% to 37% across seven brackets. For a single filer, the 10% rate covers the first $11,925 of taxable income, and the 37% rate applies above $626,350. Joint filers get roughly double those thresholds.¹⁵ The brackets are marginal. Earning $50,000 as a single filer doesn’t mean paying 22% on all of it; the first slice is taxed at 10%, the next at 12%, and only the portion above $48,475 hits 22%.

Credits, Withholding, and What You Owe

After calculating total tax, apply any credits you qualify for. Credits cut your tax dollar-for-dollar, which makes them more valuable than deductions. Common ones include the Child Tax Credit, the Earned Income Tax Credit, and education credits. Then subtract tax already paid through employer withholding (line by line off your W-2) and any estimated payments you made during the year. If payments plus credits exceed the tax, you get a refund. If they fall short, you owe.

Sign at the bottom. Signing is a declaration under penalty of perjury that the return is correct. Intentionally underreporting income carries a 20% accuracy-related penalty on the underpayment.¹⁶ Deliberate tax evasion is a felony with up to five years in prison and a fine of up to $100,000.¹⁷

Submitting the Return

E-filing is faster and more accurate, and the IRS confirms receipt right away. When you e-file a self-prepared return, you verify your identity with your prior-year AGI or Self-Select PIN, or with an Identity Protection PIN if the IRS has issued you one.¹⁸ E-filed returns typically process in about three weeks.¹⁹

If you’d rather mail it, print the completed 1040 and any schedules, sign in ink, and mail to the IRS processing center for your state (the correct address is in the Form 1040 instructions). Paper returns take six weeks or more.¹⁹ For a refund, include your bank routing and account numbers so the IRS can direct-deposit rather than mail a check.

Deadlines, Extensions, and Penalties

The deadline for a 2025 return is April 15, 2026.¹ Filing Form 4868 by that date buys you an automatic six-month extension to October 15, 2026.²⁰ An extension to file is not an extension to pay. Any tax you owe is still due April 15, and interest starts running that day.

The two late penalties are lopsided in a way that matters. Failure to file costs 5% of unpaid tax per month, capped at 25%. Failure to pay costs 0.5% per month, also capped at 25%. If your return is more than 60 days late, the minimum penalty is $525 or 100% of the tax due, whichever is less.²¹ If you can’t pay the full bill, file on time and pay what you can. The filing penalty is ten times worse than the payment penalty.

If You Owe and Can’t Pay in Full

File on time anyway, then set up a payment plan. A short-term plan gives you up to 180 days to pay off the balance with no setup fee if you apply online. A long-term installment agreement spreads payments over months, with setup fees running from $22 to $178 depending on whether you apply online or by phone and whether you use automatic bank drafts.²² Low-income taxpayers may qualify for fee waivers. Interest and penalties keep accruing while a plan is active, but the failure-to-pay penalty drops to 0.25% per month once an installment agreement is in place.²¹

After You File

Tracking a Refund

The IRS “Where’s My Refund?” tool checks status using your SSN, filing status, and the exact refund amount on your return. E-filed returns with direct deposit are the fastest combination, with most refunds arriving inside three weeks.¹⁹ Paper returns take at least six. Delays happen when a return needs review, especially early-season returns claiming the Earned Income Tax Credit or the Additional Child Tax Credit.

Keeping Records

Keep your filed return and supporting documents for at least three years from the filing date. That’s the standard window for the IRS to audit or assess additional tax.²³ If you underreported income by more than 25%, the IRS gets six years. For unfiled returns or fraud, there’s no time limit. When in doubt, hold on to records longer.

Fixing a Mistake

If you spot an error after filing, use Form 1040-X to amend the return. You can correct income, deductions, credits, or filing status. To claim a refund on an amended return, you generally have to file within three years of the original filing date or two years from when you paid the tax, whichever is later.²⁴ Amended returns can now be e-filed for the current year and up to three prior years.

If You Have Self-Employment or Investment Income

Income without withholding — freelance work, rental income, investment gains — usually means quarterly estimated tax payments during the year. The rule of thumb: if you expect to owe $1,000 or more when you file, you’re required to make estimated payments.²⁵ For the 2026 tax year, payments are due April 15, 2026, June 15, 2026, September 15, 2026, and January 15, 2027.²⁶ You can skip the January payment if you file the return and pay the full balance by February 1, 2027.

To avoid an underpayment penalty, your total payments must cover at least 90% of your current-year tax or 100% of last year’s tax, whichever is less. If your AGI last year was over $150,000, that second figure rises to 110%.²⁷

Two Things the 1040 Doesn’t Cover

State income tax is a separate return. Most states use the same April 15 deadline as the federal return, and nine states have no individual income tax at all: Alaska, Florida, Nevada, New Hampshire (on wages), South Dakota, Tennessee, Texas, Washington, and Wyoming. If your state does tax income, check the state’s department of revenue site for forms and free e-filing options.

Foreign accounts have their own reporting requirement. If your non-U.S. financial accounts had a combined value over $10,000 at any point during the year, you must file a Report of Foreign Bank and Financial Accounts (FBAR) electronically with the Financial Crimes Enforcement Network.²⁸ It’s separate from your tax return, due April 15 with an automatic extension to October 15, and the penalties for skipping it are steep even when the omission is unintentional.

1
Internal Revenue Service. IRS Announces First Day of 2026 Filing Season; Online Tools and Resources Help With Tax Filing
2
Internal Revenue Service. 2026 Tax Filing Season Opens With Several Free Filing Options Available
3
Internal Revenue Service. Age, Name or SSN Rejects, Errors, Correction Procedures
4
Social Security Administration. Deadline Dates to File W-2s
5
Internal Revenue Service. About Form 1099-NEC, Nonemployee Compensation
6
Internal Revenue Service. About Form 1099-INT, Interest Income
7
Internal Revenue Service. About Form 1098-E, Student Loan Interest Statement
8
Internal Revenue Service. About Form 5498, IRA Contribution Information
9
Internal Revenue Service. Form 5498-SA, HSA, Archer MSA, or Medicare Advantage MSA Information
10
Internal Revenue Service. Education Credits: Questions and Answers
11
Internal Revenue Service. Filing Status
12
Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026, Including Amendments From the One, Big, Beautiful Bill
13
Internal Revenue Service. 2025 Instructions for Schedule A (Form 1040) – Itemized Deductions
14
Internal Revenue Service. About Form 1040, U.S. Individual Income Tax Return
15
Internal Revenue Service. Federal Income Tax Rates and Brackets
16
Office of the Law Revision Counsel. 26 USC 6662 – Imposition of Accuracy-Related Penalty on Underpayments
17
Office of the Law Revision Counsel. 26 USC 7201 – Attempt to Evade or Defeat Tax
18
Internal Revenue Service. Validating Your Electronically Filed Tax Return
19
Internal Revenue Service. Refunds
20
Internal Revenue Service. Application for Automatic Extension of Time to File U.S. Individual Income Tax Return
21
Internal Revenue Service. Topic No. 653, IRS Notices and Bills, Penalties and Interest Charges
22
Internal Revenue Service. Payment Plans; Installment Agreements
23
Internal Revenue Service. Topic No. 305, Recordkeeping
24
Internal Revenue Service. Instructions for Form 1040-X
25
Internal Revenue Service. Estimated Taxes
26
Internal Revenue Service. Form 1040-ES (2026)
27
Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty
28
Financial Crimes Enforcement Network. Report Foreign Bank and Financial Accounts