The Form 1040 is the main tax return form the IRS uses to collect income tax from individuals

Form 1040 is the document you send to the IRS each year to report your income and calculate how much federal income tax you owe. It is the standard form for most people filing a personal tax return. The form asks for your name, address, Social Security number, income from all sources, and deductions or credits that lower your tax bill. At the end, it shows whether you owe money, will receive a refund, or have paid the right amount.

The IRS publishes a new version of Form 1040 every tax year because tax law changes and the form layout shifts. The version you use depends on the year you are filing for — for example, the 2023 Form 1040 is different from the 2024 Form 1040. You can download the correct year's form from IRS.gov or request a paper copy by mail.

Key Takeaways

  • Form 1040 is the main individual income tax return form, and most people who earn income must file one each year.
  • The form requires your income from wages, self-employment, investments, and other sources, plus any deductions or tax credits you claim.
  • You file Form 1040 by the tax deadline, usually April 15, either on paper by mail or electronically through tax software or a tax professional.
  • The form calculates your total tax owed and shows whether you will receive a refund, owe additional tax, or have paid the correct amount.
  • Different versions of Form 1040 are used each tax year, so you must use the form for the year you are filing.

What information goes on Form 1040

The top of the form asks for personal information: your full name, current address, and Social Security number. You also indicate your filing status — single, married filing jointly, married filing separately, head of household, or may have access to widow(er). This status affects your tax rate and which deductions you can claim.

The middle sections ask you to report income. This includes wages from a job (reported on a W-2 form your employer sends you), self-employment income, interest and dividends from investments, rental income, and other sources. You add all income together to get your total income.

Below that, you report deductions. Most people take the standard deduction, which is a fixed dollar amount that reduces your taxable income. In 2024, the standard deduction ranges from $14,600 for single filers to $29,200 for married couples filing jointly, though these amounts change each year. Some people instead itemize deductions — listing specific expenses like mortgage interest or charitable donations — if that total is higher than the standard deduction.

You also report tax credits, which directly reduce the tax you owe. Common credits include the Earned Income Tax Credit (EITC) for lower-income workers and the Child Tax Credit for parents. Unlike deductions, which lower your income, credits subtract directly from your tax bill.

Who must file Form 1040

You must file Form 1040 if your income exceeds a threshold set by the IRS. The threshold depends on your age, filing status, and type of income. For 2024, a single person under 65 must file if their income is $14,600 or more. A married couple filing jointly must file if their combined income is $29,200 or more. These thresholds are higher for people age 65 and older.

Self-employed people must file if their net self-employment income is $400 or more, even if their total income is below the standard threshold. You must also file if you had income tax withheld from your paychecks and expect a refund, even if you are not required to file otherwise.

Some people file even though they are not required to because they are owed a refund. If your employer withheld too much tax, or if you are due a refund from a tax credit like the EITC, filing Form 1040 is how you claim that money back.

How to obtain and submit Form 1040

You can get Form 1040 in three ways. First, download it free from IRS.gov — search for "Form 1040" and the tax year you need. Second, call the IRS at 1-800-829-3676 and request a paper copy by mail; it usually arrives within two weeks. Third, use tax preparation software or hire a tax professional, and they will handle the form for you.

You submit Form 1040 by the tax deadline, which is usually April 15 of the year following the tax year. If April 15 falls on a weekend or holiday, the deadline moves to the next business day. You can file on paper by mailing it to the IRS address shown in the form instructions, or you can file electronically using tax software or a tax professional. Electronic filing is faster and the IRS processes it more quickly.

If you cannot meet the deadline, you can request an extension by filing Form 4868 before April 15. This gives you until October 15 to file, though you still owe any tax due by April 15 to avoid penalties and interest.

Form 1040 schedules and attachments

Form 1040 by itself is often not enough. Depending on your income sources and deductions, you may need to attach additional forms called schedules. These are lettered forms — Schedule A, Schedule C, Schedule D, and so on — that provide detailed information about specific types of income or deductions.

For example, if you are self-employed, you file Schedule C to report your business income and expenses. If you have capital gains from selling stocks or property, you file Schedule D. If you itemize deductions instead of taking the standard deduction, you file Schedule A. If you have rental income, you file Schedule E. The tax software or your tax professional will tell you which schedules you need based on your situation.

You also attach copies of documents the IRS may ask for, such as your W-2 forms from employers or 1099 forms reporting other income. These documents are not mailed with your return — you keep them for your records — but the IRS knows to expect them and may request them later if they have questions.

What happens after you file Form 1040

After you submit Form 1040, the IRS processes it. If you filed electronically, processing usually takes two to three weeks. If you mailed a paper return, it takes longer — typically four to six weeks. During this time, the IRS checks your math, verifies your income against W-2 and 1099 forms, and confirms you reported all required information.

Once processing is complete, one of three things happens. If you overpaid your taxes through withholding or estimated payments, you receive a refund. The IRS sends refunds by direct deposit (fastest, usually within two weeks of processing) or by check (slower, usually within four weeks). If you underpaid, you receive a bill for the amount owed, plus any penalties and interest if you filed late. If you paid the correct amount, you receive a notice saying so.

The IRS keeps your return on file. You may need a copy later to prove your income for a loan, rental application, or other purpose. You can request a transcript of your return from IRS.gov or by calling 1-800-829-1040.

Form 1040 versus other tax forms

The IRS offers simplified versions of Form 1040 for people with straightforward tax situations. Form 1040-SR is designed for people age 65 and older and has larger print. Form 1040-NR is for nonresidents and foreign nationals. Most people, however, file the standard Form 1040.

Form 1040 is different from other tax documents you may receive. A W-2 form reports wages your employer paid you. A 1099 form reports other income — freelance work, interest, dividends, rental income. These forms go to you and the IRS; you use them to fill out Form 1040. Form 1040 is your personal tax return that summarizes all your income and calculates your tax.

Frequently Asked Questions

Can I file Form 1040 on paper, or do I have to file electronically?

You can file on paper by mailing it to the IRS address listed in the form instructions. However, electronic filing is faster — the IRS processes it in two to three weeks instead of four to six weeks — and you receive confirmation that the IRS received it. Paper filing is slower and offers no proof of receipt.

What if I make a mistake on Form 1040 after I file it?

You can file an amended return using Form 1040-X. You must file it within three years of the original deadline. Form 1040-X shows what you reported originally, what you are changing, and why. The IRS will recalculate your tax and send you a refund or a bill for any additional tax owed.

Do I need to keep Form 1040 after I file it?

Yes. Keep a copy of your filed Form 1040, all schedules, and supporting documents (W-2s, 1099s, receipts for deductions) for at least three years. The IRS can audit your return during that time and may ask to see these documents. Some people keep records longer if they own a home or have ongoing business income.

What if I do not understand a line on Form 1040?

The IRS publishes detailed instructions for Form 1040 each year, free on IRS.gov. The instructions explain each line, give examples, and tell you which schedule to file if needed. You can also contact a tax professional or call the IRS at 1-800-829-1040 for help with specific questions.