What Form 1040 is for
Form 1040 is the yearly income tax return for individuals. You use it to report your 2025 income, subtract your deduction, figure your tax, and settle up with credits and payments already made. The result is either a refund or a balance you owe. The rules cover all U.S. citizens, wherever they live, and resident aliens.
Everyone can file Form 1040. If you were born before January 2, 1961, you have the option to use Form 1040-SR instead. Many people file the form alone. A more complicated return, one with extra income, adjustments, other taxes, or certain credits, needs one or more of the numbered schedules, Schedules 1 through 3, plus the new Schedule 1-A.
Who has to file Form 1040?
The filing rules apply to all U.S. citizens, no matter where they live, and to resident aliens. For 2025, a single person under 65 files if gross income was at least $15,750, or $17,750 at age 65 or older. Married filing jointly starts at $31,500 when both spouses are under 65. Head of household starts at $23,625. Married filing separately files at just $5 of gross income.
You also file if any of a handful of other situations applied in 2025. And even when nothing forces you to file, you should file to get back any federal income tax withheld, or to claim the earned income credit, the additional child tax credit, the American opportunity credit, the premium tax credit, or the refundable adoption credit.
- Net earnings from self-employment of at least $400
- Wages of $108.28 or more from a church or qualified church-controlled organization exempt from employer social security and Medicare taxes
- Advance payments of the premium tax credit made for you, your spouse, or a dependent
- You owe special taxes such as alternative minimum tax or household employment taxes
When is Form 1040 due?
File Form 1040 by April 15, 2026. If you file after that date, you may have to pay interest and penalties. Need more time? File Form 4868 no later than the date your return is due and you get an automatic 6-month extension. That extension covers filing only. Tax you do not pay by the original due date still runs interest, and you may owe penalties on top.
Some people get extra time without filing anything. If you live outside the United States and Puerto Rico and your main place of business or post of duty is outside both, or you are on military or naval service duty outside both, you get an automatic 2 months to file and pay. Interest still runs from the original due date, and you must include a statement showing you meet the requirements. If 2 months is not enough, file Form 4868 by June 15, 2026, for 4 more months.
Where do you send Form 1040?
If you e-file, there is nothing to mail. If you choose to mail a paper return instead, filing instructions and addresses appear at the end of the form instructions. Those addresses are for Form 1040 or 1040-SR filed in 2026, and the address for returns filed after 2026 may be different. You can also use certain private delivery services designated by the IRS, including specific DHL Express, UPS, and FedEx services, to meet the timely mailing rule. Only the U.S. Postal Service delivers to P.O. boxes, so you cannot use a private delivery service for payments that must go to one.
What changed on the 2025 Form 1040?
The standard deduction went up for every filer: $15,750 for single or married filing separately, $31,500 for married filing jointly or qualifying surviving spouse, and $23,625 for head of household. Four new deductions start in 2025, and you can claim them whether you take the standard deduction or itemize. Income limits apply to each one.
A new schedule, Schedule 1-A, is where those four deductions get claimed, and the total carries to line 13b. The maximum child tax credit rose to $2,200 per qualifying child, of which $1,700 can be claimed as the additional child tax credit. Up to $5,000 of the adoption credit is now refundable. The state and local tax deduction limit rose to $40,000, or $20,000 if married filing separately. The Dependents section now has numbered rows and asks for more information.
- Up to $25,000 of qualified tips
- Up to $12,500 of qualified overtime, or $25,000 if married filing jointly
- Up to $10,000 of qualified passenger vehicle loan interest on a vehicle bought in 2025 for personal use
- Up to $6,000 for seniors born before January 2, 1961, or $12,000 if both spouses are eligible
How do you fill out Form 1040?
Start with your name, address, and social security number, then check one filing status box. Answer the digital asset question by checking Yes or No. Do not leave it blank. List your dependents next. Then report income: wages from Form W-2 box 1 on line 1a, interest, dividends, IRA and pension amounts, social security, and capital gains. Line 9 adds up your total income, line 10 pulls adjustments from Schedule 1, and line 11a is your adjusted gross income.
Your deduction goes on line 12e, the qualified business income deduction on line 13a, and Schedule 1-A deductions on line 13b. Subtract all of it from your AGI for taxable income on line 15. Figure the tax with the Tax Table if taxable income is under $100,000, or the Tax Computation Worksheet if it is $100,000 or more. Then apply credits and payments and see where you land. Sign and date the return. A paper return needs a handwritten signature, because typed and digital signatures are not valid on paper.
Getting a refund or paying what you owe
Line 34 shows what you overpaid. Enter the part you want back on line 35a, then add your routing number, account type, and account number for direct deposit. To split the refund across up to three accounts, attach Form 8888. Refunds on returns claiming the earned income credit or the additional child tax credit cannot be issued before mid-February 2026, and that delay applies to the whole refund, not just the credit part. An overpayment under $1 comes only on written request.
Line 37 is what you owe. Pay in full by April 15, 2026, to avoid interest and penalties. You do not have to pay if line 37 is under $1. Payment options include your online account, IRS Direct Pay, debit or credit card, digital wallet, electronic funds withdrawal, and cash. If you mail a check, attach Form 1040-V. If you cannot pay it all, you can apply online for an installment agreement or use Form 9465, or ask for more time to pay by filing Form 1127 by the due date.
Form 1040 line by line
| Line | What goes there |
|---|---|
| 1a | Total wages from box 1 of all your Forms W-2, including your spouse's if you file jointly. |
| 2b | Your total taxable interest. Attach Schedule B if the total is over $1,500. |
| 4b | The taxable part of your IRA distributions. Enter the full distribution on line 4a when only part is taxable. |
| 5b | The taxable part of your pensions and annuities, including 401(k), 403(b), and governmental 457(b) distributions. |
| 6b | The taxable part of your social security benefits, figured on the Social Security Benefits Worksheet. |
| 7a | Capital gain or loss. Attach Schedule D if required, or check the box on line 7b if it is not. |
| 11a | Your adjusted gross income: total income from line 9 minus adjustments from Schedule 1, line 26. |
| 12e | Your standard deduction or your itemized deductions from Schedule A, whichever you take. |
| 13b | Additional deductions from Schedule 1-A, line 38, for tips, overtime, car loan interest, and the senior deduction. |
| 15 | Taxable income: line 11b minus line 14. Enter -0- if the result is zero or less. |
| 24 | Your total tax, from lines 22 and 23, including self-employment tax and other taxes from Schedule 2. |
| 33 | Total payments: withholding, estimated tax payments, and refundable credits added together. |
| 34 | The amount you overpaid, when line 33 is more than line 24. |
| 37 | The amount you owe, when line 33 is less than line 24. Include any estimated tax penalty from line 38. |
Penalties and withholding
$25 or 2%
A payment to the IRS that was dishonored, whichever is more, or the amount paid if it was under $25
2 years
How long you lose the child tax credit or EIC after an error due to reckless or intentional disregard of the rules
10 years
How long you lose those credits after a claim the IRS determines was fraudulent
Source: IRS, Form 1040 (Rev. 2025) and Instructions for Form 1040 (and Form 1040-SR). This page explains the form in plain English. It is not tax advice.