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

The Form 1040 is the federal income tax return form. You file it with the Internal Revenue Service (IRS) to report how much money you earned during the year and calculate how much tax you owe — or whether you should get money back. Almost every person who works in the United States files a 1040 or a variation of it.

The form asks for your name, address, Social Security number, and income from all sources: wages, self-employment, investments, rental property, and other earnings. You then subtract deductions and credits you may have access to for, which lowers the amount of tax you owe. The IRS uses your 1040 to check that you paid the right amount of tax throughout the year through paycheck withholding or quarterly payments.

You file your 1040 once per year, usually between January 1 and April 15. The deadline is April 15 unless it falls on a weekend or holiday, in which case it moves to the next business day.

Key Takeaways

  • Form 1040 is the standard federal income tax return that reports your yearly earnings and calculates your tax liability.
  • You must file a 1040 if your income exceeds certain thresholds, which vary based on your age, filing status, and type of income.
  • The form requires your Social Security number, address, income from all sources, and information about dependents or deductions you claim.
  • Most people file between January and April 15, though you can file earlier once the IRS begins accepting returns in late January.
  • You can file by mail, through tax software, or with a tax preparer — the IRS does not charge a fee to file.

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 filing jointly, head of household, and so on), and whether your income is from wages, self-employment, or other sources.

For 2024, a single person under 65 with only wage income must file if they earned more than $14,600. A married couple filing jointly with both spouses under 65 must file if their combined income exceeded $29,200. These numbers change each year. If you are self-employed, the threshold is lower — you must file if your net self-employment income is $400 or more, regardless of your total income.

Even if your income is below the threshold, you should file if you had taxes withheld from your paychecks or made quarterly tax payments. Filing allows you to claim a refund of that money. You should also file if you may have access to for tax credits like the Earned Income Tax Credit (EITC) or the Child Tax Credit, because filing is how you claim them.

What information you need to gather before filing

Before you sit down to file, collect documents that show your income and any deductions or credits you plan to claim. If you received wages, your employer will send you a Form W-2 by January 31, showing how much you earned and how much tax was withheld. If you are self-employed or had other income, you may receive a Form 1099 (the exact type depends on the source — 1099-NEC for contractor income, 1099-INT for interest, 1099-DIV for dividends, and so on).

Gather receipts or statements for deductions you plan to claim. If you own a home, collect your mortgage interest statements and property tax records. If you donated to charity, keep records of those donations. If you paid student loan interest, get that statement from your lender. If you have children or dependents, have their Social Security numbers ready.

If you paid estimated taxes or had taxes withheld, you will need those payment records or your pay stubs showing withholding amounts. The IRS already has this information from your employer or the financial institutions that sent you 1099 forms, but having it yourself helps you catch errors and file accurately.

The difference between the standard 1040 and variations

The IRS offers one main 1040 form, but there are two related forms you might hear about: Form 1040-SR and Form 1040-NR. Form 1040-SR is designed for people age 65 and older and has larger print and slightly different line arrangements, but it covers the same income and deductions. Form 1040-NR is for nonresident aliens — people who are not U.S. citizens and do not meet the residency test for tax purposes.

In the past, the IRS offered separate forms like the 1040-A and 1040-EZ for simpler tax situations, but those were discontinued after 2017. Now everyone uses the same 1040, though the form itself is shorter than it used to be. Schedules — additional forms that attach to your 1040 — handle specific types of income or deductions. For example, if you are self-employed, you file Schedule C with your 1040 to report business income and expenses.

How to file your 1040

You have three main options: file by mail, use tax software, or work with a tax preparer. Filing by mail means printing the form, filling it out by hand, and mailing it to the IRS address listed in the instructions. This is free but slower — processing takes several weeks.

Tax software (such as TurboTax, H&R Block, or TaxAct) walks you through questions about your income and deductions, then generates your completed 1040 and any schedules you need. Many software providers offer free versions if your income is below a certain level. You file electronically, which is faster — the IRS typically processes e-filed returns within 21 days.

A tax preparer or CPA will gather your information, complete your 1040 and all necessary schedules, and file it for you. This costs money but is useful if your taxes are complicated or you are unsure what to claim. The IRS does not charge a fee to file, no matter which method you choose.

What happens after you file

After you file your 1040, the IRS processes it. If you filed electronically, you should receive confirmation within 24 hours that the IRS received your return. The IRS then checks your information against W-2s, 1099s, and other documents it received from employers and financial institutions.

If you are owed a refund, the IRS will send it to you by direct deposit (if you provided your bank account information) or by check, usually within 21 days of processing your return. If you owe taxes, the IRS will send you a bill. You can pay by check, electronic transfer, credit card, or through an installment plan if you cannot pay in full.

If the IRS finds a discrepancy between your return and the documents it received, it will send you a notice explaining the issue and asking for more information or payment. This is called an audit notice, though most are resolved by mail without a meeting.

Frequently Asked Questions

Can I file my 1040 before January?

No. The IRS does not begin accepting returns until late January each year, usually around January 29. This delay gives employers and financial institutions time to send W-2s and 1099s to both you and the IRS. You can prepare your return earlier, but you cannot file it electronically until the IRS opens for the season.

What if I miss the April 15 deadline?

File as soon as you can. If you owe taxes, you will owe penalties and interest on the unpaid amount, but filing late is better than not filing. If you are owed a refund, there is no penalty for filing late, though you may lose the refund if you wait more than three years.

Do I need to file if I had no income?

Probably not, unless you had taxes withheld or you may have access to for refundable credits. If you had no income and no withholding, you do not need to file. However, if you had even a small amount withheld, filing gets you that money back.

What is the difference between a refund and a credit?

A credit reduces the tax you owe. A refundable credit can give you money back even if you owe no tax. A nonrefundable credit can only reduce your tax to zero — it cannot create a refund. The Earned Income Tax Credit is refundable; the Child and Dependent Care Credit is not.

Can I file my 1040 on paper if I want to?

Yes. You can print the form, fill it out by hand, and mail it to the IRS address in the instructions. Paper filing is free but takes longer to process. The IRS encourages electronic filing because it is faster and more accurate.