The 1040 is the main form you use to report your income to the IRS each year

Form 1040 is the U.S. Individual Income Tax Return. It is the document you send to the IRS to report how much money you earned in a tax year, what taxes were already taken out of your paychecks or paid in other ways, and whether you owe more tax or will receive a refund. Nearly every person who works in the United States files a 1040 or a variation of it.

The form itself is relatively short — usually two pages — but it pulls together information from other documents you may have received, like W-2s from employers or 1099s from clients or investment accounts. The 1040 is where you add up all that income, claim deductions or credits you are may have access to to, and calculate your final tax bill or refund.

You file the 1040 once per year, by the deadline set by the IRS (usually April 15, though it can be extended). You send it to the IRS either by mail or electronically through tax software or a tax preparer.

Key Takeaways

  • Form 1040 reports your total income for the year and calculates whether you owe federal income tax or will receive a refund.
  • You gather information from W-2s, 1099s, and other income documents before you fill out the 1040.
  • The 1040 includes sections for deductions and credits that can lower the tax you owe.
  • Filing a 1040 is required if your income exceeds the threshold set by the IRS for your filing status, even if no tax is owed.

Who has to file a 1040

You must file a 1040 if your income is above a certain amount. That threshold depends on your age, filing status (single, married, head of household, and so on), and the type of income you earned. For example, in 2023, a single person under 65 had to file if they earned more than $13,850 in wages. A married couple filing jointly had to file if their combined income exceeded $27,700.

These income thresholds change each year. You can find the current year's thresholds on the IRS website or ask a tax preparer. Even if your income is below the threshold, you may want to file anyway — for instance, if taxes were taken out of your paychecks, filing allows you to claim a refund of that money.

Self-employed people (those who run their own business or work as contractors) have a lower threshold and almost always must file, even if their net income is small.

What information you need before you start

Gather these documents before you begin filling out your 1040:

  • W-2 forms from each employer you worked for during the year. Your employer sends this to you by January 31.
  • 1099 forms if you received income other than wages — for example, 1099-NEC for self-employment income, 1099-INT for interest, or 1099-DIV for dividends. These also arrive by January 31.
  • Records of tax payments you made during the year, including federal income tax withheld from paychecks, estimated tax payments you sent to the IRS, or taxes paid with an extension.
  • Documentation of deductions if you plan to itemize — for example, receipts for charitable donations, mortgage interest statements, or medical expense records.
  • Social Security number for yourself and your spouse (if filing jointly) and any dependents you claim.

If you use tax software or hire a preparer, they will walk you through what you need. If you file by hand, the IRS instructions that come with the 1040 explain what to bring.

The main sections of the 1040

The 1040 is organized into a few key parts. The first section asks for your personal information — name, address, Social Security number, and filing status. You also indicate whether anyone can claim you as a dependent.

The second section is where you report your income. You list wages from your W-2s, interest and dividends, self-employment income, and any other money you received. You add these up to get your total income.

Next comes deductions. You can either take the standard deduction (a flat amount set by the IRS each year that reduces your taxable income) or itemize deductions (add up specific expenses like mortgage interest, state taxes, or charitable gifts). Most people take the standard deduction because it is simpler and often larger.

Then you calculate your taxable income by subtracting your deduction from your total income. You use tax tables or software to find out how much tax you owe on that amount. Finally, you subtract any credits you may have access to for (like the Earned Income Tax Credit) and any taxes that were already withheld from your paychecks. The result is either a refund owed to you or additional tax you owe to the IRS.

Standard deduction versus itemizing

The standard deduction is a set amount that the IRS lets you subtract from your income before calculating tax. For 2023, the standard deduction was $13,850 for a single filer and $27,700 for married filing jointly. These amounts increase slightly each year.

If you itemize deductions, you add up specific expenses instead — mortgage interest, property taxes, state income taxes, charitable donations, and certain medical costs. You only itemize if your total itemized deductions are larger than the standard deduction. Most people find the standard deduction is bigger and easier to use, so they take it. But if you own a home with a large mortgage or make large charitable donations, itemizing might save you more money.

You choose one or the other on your 1040 — you cannot take both.

Filing methods and where to send your 1040

You have three main ways to file your 1040:

  • E-file (electronic filing) through IRS-approved tax software or a tax preparer. This is the fastest method — the IRS processes e-filed returns in about two weeks. Most people use this route.
  • Paper filing by printing the form and mailing it to the IRS address listed in the instructions. This takes longer — typically four to six weeks — and you have no way to track receipt.
  • Free filing through IRS Free File if your income is below a certain threshold (usually around $73,000). The IRS partners with tax software companies to offer free e-filing to lower-income filers.

The IRS mailing address depends on your state and whether you are including a payment. The address is printed in the 1040 instructions and also available on the IRS website.

What happens after you file

Once you file, the IRS processes your return. If you e-filed, you usually receive confirmation within 24 hours. The IRS then reviews your return to make sure the math is correct and that you reported all required income.

If you are owed a refund, the IRS sends it to you by direct deposit (if you provided your bank account information) or by check. Refunds typically arrive within 21 days of e-filing, though it can take longer during busy tax season.

If you owe additional tax, you must pay by the filing deadline to avoid penalties and interest. You can pay online, by phone, or by mail.

Keep a copy of your filed 1040 and all supporting documents for at least three years. The IRS can audit your return during that time and ask you to prove the income and deductions you reported.

Frequently Asked Questions

Do I have to file a 1040 if I did not earn much money?

Only if your income exceeds the IRS threshold for your filing status. However, if taxes were taken out of your paychecks, you should file anyway to claim a refund of that money. Even if you do not owe tax, filing can get you refundable credits like the Earned Income Tax Credit.

What is the difference between a 1040 and a 1040-SR?

Form 1040-SR is a version of the 1040 designed for people age 65 and older. It has larger print and is organized slightly differently, but it serves the same purpose. You can use either form if you are 65 or older; choose whichever is easier for you.

Can I file a 1040 if I am self-employed?

Yes. Self-employed people file a 1040, but they also file Schedule C (to report business income and expenses) and Schedule SE (to calculate self-employment tax). These schedules attach to the 1040 and provide the income figure that goes on the main form.

What if I made a mistake on my 1040 after I filed it?

You can file an amended return using Form 1040-X. You must file it within three years of the original filing date. The IRS will recalculate your tax based on the corrected information and send you a refund or bill you for additional tax owed.

Do I need to file a 1040 if I only received Social Security?

Usually not, unless your combined income (including half of your Social Security benefits) exceeds a certain threshold. The rules are complex and depend on your filing status and other income. Contact the IRS or a tax preparer to determine whether you must file.