The 1040 is the main form you use to report your income to the IRS
The 1040 is the federal income tax form that most individual taxpayers file with the Internal Revenue Service (IRS) each year. It is where you report all the income you earned — wages, self-employment income, investment gains, and other sources — and calculate how much tax you owe or how much the government owes you back.
The IRS sends out millions of 1040 forms every tax season. You file it by the federal important date, which is typically April 15 of the year after you earned the income. If you earned income in 2023, for example, you would file your 1040 for the 2023 tax year by April 15, 2024.
The form itself is relatively short — usually two pages — but it connects to other forms and schedules that provide more detail about specific types of income or deductions you claim.
Key Takeaways
- The 1040 is the standard federal income tax form for individuals and is filed once per year with the IRS.
- You report all sources of income on the 1040, including wages from a job, self-employment earnings, interest, dividends, and retirement distributions.
- The form calculates your total tax liability and shows whether you owe money or will receive a refund.
- Most people file the 1040 by April 15, though you can request an extension to file by October 15 of the same year.
- The 1040 works together with schedules and other forms that provide details about deductions, credits, and specific income types.
Who has to file a 1040
You must file a 1040 if your income exceeds a certain threshold set by the IRS each year. The threshold depends on your age, filing status (single, married filing jointly, head of household, and so on), and whether you are claimed as a dependent on someone else's return. The IRS publishes these thresholds annually, and they change slightly each year.
Even if your income is below the threshold, you should file if you had taxes withheld from your paychecks or if you made estimated tax payments during the year. Filing allows you to claim a refund of that money. You should also file if you are may have access to to certain tax credits, such as the Earned Income Tax Credit, because filing is how you claim them.
Self-employed people — those who run their own business or work as a contractor — must file a 1040 if their net self-employment income is $400 or more, regardless of other income.
What information you report on the 1040
The 1040 asks for your personal information at the top: your name, address, Social Security number, and filing status. You then report income in several categories. Wages and salaries from an employer go in one section. Interest and dividend income from savings accounts and investments go in another. If you are self-employed, you report your business income and expenses.
The form also has space for you to claim deductions — amounts you subtract from your income to lower your taxable income. Most people take the standard deduction, which is a fixed dollar amount that depends on your filing status and age. Some people instead list out individual deductions (called itemizing), such as mortgage interest, state and local taxes, or charitable donations, if those add up to more than the standard deduction.
You also report any tax credits you are may have access to to. Credits are different from deductions: they reduce your tax bill dollar-for-dollar rather than reducing your income. Common credits include the Child Tax Credit and the Earned Income Tax Credit.
How the 1040 calculates what you owe
The 1040 works through a series of calculations. You start by adding up all your income from all sources. You then subtract your deductions (either the standard deduction or your itemized deductions) to arrive at your taxable income. The IRS tax tables then tell you how much tax you owe on that income based on your filing status and tax bracket.
Next, the form accounts for any taxes already paid. If your employer withheld taxes from your paychecks throughout the year, that amount is subtracted from what you owe. If you made estimated tax payments, those are subtracted too. You then explore any credits you are may have access to to, which further reduces your tax bill.
The final number is either the amount you owe the IRS or the amount the IRS owes you as a refund. If you owe money, you pay it when you file. If the government owes you money, you receive a refund, usually by direct deposit to your bank account.
Schedules and forms that attach to the 1040
The 1040 by itself is straightforward, but most people need to file additional forms alongside it. Schedule C is used by self-employed people to report business income and expenses. Schedule A is filed by people who itemize deductions instead of taking the standard deduction. Schedule 1 reports other types of income, such as rental income, capital gains, or income from a side job.
If you have investment income, you may need to file Schedule D to report capital gains and losses. If you received a mortgage interest statement from your lender, you use that information on Schedule A. If you received a 1099 form from a bank, investment company, or other payer, that information goes on the appropriate schedule.
Your employer provides a W-2 form that shows your wages and the taxes withheld. You attach a copy to your 1040. If you are self-employed or received income from sources other than an employer, you may receive a 1099 form instead, which you also report on your return.
When and how to file your 1040
The important date to file your 1040 is typically April 15 of the year following the tax year. If April 15 falls on a weekend or holiday, the important date moves to the next business day. You can file electronically (called e-filing) through tax software, a tax professional, or the IRS Free File program if your income is below a certain level. You can also print the form and mail it to the IRS address listed in the instructions.
If you cannot file by April 15, you can request an extension using Form 4868. An extension gives you until October 15 to file, but it does not extend the important date to pay any taxes you owe. If you owe money, you should pay it by April 15 even if you file late, to avoid penalties and interest.
Many people use tax software such as TurboTax, H&R Block, or TaxAct to prepare and file their 1040. Others work with a tax professional or accountant. The IRS also offers free filing options through its Free File program for people whose income is below a certain threshold.
What happens after you file
After you file your 1040, the IRS processes it. If you are owed a refund, you typically receive it within 21 days if you filed electronically and chose direct deposit. If you mailed a paper return, processing takes longer — usually several weeks.
The IRS may contact you if there are questions about your return, such as missing information or a discrepancy between what you reported and what employers or financial institutions reported to the IRS. You should keep copies of your 1040 and all supporting documents for at least three years in case the IRS asks about your return.
Frequently Asked Questions
Do I have to file a 1040 if I did not earn much income?
It depends on how much you earned and your filing status. The IRS sets income thresholds each year — if your income is below the threshold for your situation, you are not required to file. However, you should file anyway if you had taxes withheld from paychecks or made estimated payments, because you may be owed a refund.
What is the difference between the 1040 and a 1040-SR?
The 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 to complete.
Can I file my 1040 before I receive all my income documents?
You can file once you have received your W-2 forms from employers and any 1099 forms from other income sources. You should not file before you have these documents, because you need them to report your income accurately. If you are still waiting for a document close to the important date, you can request an extension.
What if I made a mistake on my 1040 after I filed it?
You can file an amended return using Form 1040-X. You have three years from the original filing date to file an amended return and claim a refund, or seven years if you are reporting a loss. If you owe additional tax, you should file the amendment as soon as you discover the error to minimize penalties and interest.
Is there a penalty if I file my 1040 late?
Yes. If you owe taxes and file late, the IRS charges a failure-to-file penalty and interest on the unpaid amount. The penalty is usually 5 percent of the unpaid tax for each month the return is late. You can reduce or avoid the penalty by filing as soon as possible and paying what you owe, or by requesting an extension before the April 15 important date.