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 Internal Revenue Service (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 in the United States. The form asks you to list all the money you earned, subtract deductions or credits you are may have access to to, and arrive at a final number: either a refund the government owes you or a payment you owe them.

You file Form 1040 once per year, typically by April 15, unless you request an extension. The form itself is relatively short — usually two pages — but it connects to other forms and schedules that provide the detail behind each number. For example, if you have investment income, you attach Schedule B. If you own a business, you attach Schedule C. Form 1040 is where all those pieces come together.

Key Takeaways

  • Form 1040 is the IRS form you use to report your annual income and file your federal tax return.
  • You report wages, interest, dividends, self-employment income, and other earnings on Form 1040, then subtract deductions or credits to find your tax liability.
  • Most people file Form 1040 by April 15 each year, though you can request a six-month extension to October 15.
  • Form 1040 is a summary document — it connects to additional schedules and forms that provide detail about specific types of income or deductions.
  • The IRS provides Form 1040 for free on its website, and many tax software programs help you fill it out and file it electronically.

What goes on Form 1040

Form 1040 has sections for different types of income. At the top, you enter your personal information: name, address, Social Security number, and filing status (single, married filing jointly, head of household, and so on). Then you move into income.

The income section includes wages from a job (reported on a W-2 form your employer sends you), interest and dividends from savings or investments, capital gains or losses from selling stocks or property, self-employment income if you run a business, and other sources like rental income, retirement distributions, or alimony. Each type of income has its own line or section.

After you total your income, you subtract either the standard deduction (a fixed amount that depends on your age and filing status) or itemized deductions (specific expenses you list out, like mortgage interest or charitable donations). This gives you your taxable income. Then you calculate the tax owed on that amount using the tax tables the IRS provides, and you subtract any credits you are may have access to to — such as the Earned Income Tax Credit or a child tax credit. The result is your total tax liability.

Who has to file Form 1040

You must file Form 1040 if your income exceeds a threshold set by the IRS each year. The threshold depends on your age, filing status, and type of income. For example, in 2023, a single person under 65 had to file if their income was $13,850 or more. A married couple filing jointly had to file if their combined income was $27,700 or more. These numbers change each year.

Even if your income is below the threshold, you may want to file anyway — particularly if you had taxes withheld from your paycheck or if you are may have access to to a refundable credit like the Earned Income Tax Credit. Filing allows you to claim that money back.

Form 1040 and its related schedules

Form 1040 by itself is a summary. The real detail lives in the schedules and forms you attach to it. If you have investment income, you file Schedule B (Interest and Ordinary Dividends). If you are self-employed, you file Schedule C (Profit or Loss from Business). If you have capital gains, you file Schedule D. If you itemize deductions instead of taking the standard deduction, you file Schedule A.

The IRS publishes instructions for each schedule, and they explain which one you need based on your situation. Tax software typically guides you through this by asking questions about your income and life circumstances, then automatically generating the right forms and schedules for you.

How to get and file Form 1040

The IRS publishes Form 1040 for free on its website at irs.gov. You can read it as a PDF, print it, fill it out by hand, and mail it to the IRS address listed in the instructions. You can also file electronically using tax software — either free software the IRS partners with (through the Free File program) or commercial software you purchase.

Electronic filing is faster and more accurate than mailing a paper return. The IRS typically processes e-filed returns within 21 days, whereas paper returns can take several weeks or months. If you are owed a refund and you file electronically with direct deposit, you may receive your money within two to three weeks.

If you need more time, you can request an automatic extension by filing Form 4868 by April 15. This gives you until October 15 to file your return, though it does not extend the important date for paying any taxes you owe — those are still due by April 15.

Form 1040 versus other tax forms

The IRS offers a few versions of Form 1040 for different situations. Form 1040-SR is designed for people 65 and older and has larger print and slightly different sections. Form 1040-NR is for nonresidents and people with certain visa statuses. But for most U.S. citizens and residents, the standard Form 1040 is what you use.

Some people may have heard of the old Form 1040-A or Form 1040-EZ, which were simpler versions for people with straightforward tax situations. The IRS discontinued these forms after 2017 and now uses Form 1040 for everyone, with optional schedules depending on your circumstances. This change actually made filing simpler for many people because there is no longer confusion about which form to use.

What happens after you file Form 1040

Once the IRS receives your Form 1040, they process it and compare it to information they have from employers, banks, and other sources — like your W-2 forms and 1099 forms. If everything matches, they either send you a refund or bill you for any balance owed. If there is a discrepancy, they may contact you to clarify.

Keep a copy of your filed return and all supporting documents (W-2s, receipts, bank statements) for at least three years. The IRS can audit a return up to three years after you file it, and having your records organized makes that process much simpler if it happens.

Frequently Asked Questions

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

Not necessarily. The IRS sets an income threshold each year, and you only have to file if your income exceeds it. However, if you had taxes withheld from your paycheck or you are may have access to to a refundable credit, filing allows you to claim that money back, so it may be worth filing even if you are not required to.

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

You can file on paper by printing the form, filling it out by hand, and mailing it to the IRS address listed in the instructions. However, electronic filing is faster — the IRS typically processes e-filed returns within 21 days — and it is less prone to errors. Many people use free tax software to file electronically.

What is the difference between Form 1040 and a W-2?

A W-2 is a form your employer sends you that reports the wages you earned and the taxes they withheld. Form 1040 is the return you file with the IRS that reports all your income from all sources and calculates your total tax liability. You use the information from your W-2 to fill out Form 1040.

What if I owe money when I file Form 1040?

If you owe taxes, you can pay by check, electronic transfer, credit card, or debit card. The IRS website has a payment portal where you can set up a payment plan if you cannot pay the full amount at once. You can also request a short-term extension to pay without penalty.

Can I amend Form 1040 after I file it?

Yes. If you made a mistake or forgot to report income, you can file Form 1040-X (Amended U.S. Individual Income Tax Return) to correct it. You typically have three years from the original filing date to amend a return, though there are some exceptions for specific situations.