Whether you need to file depends on your income, filing status, and age

You must file a federal tax return if your income exceeds a certain threshold set by the IRS each year. That threshold changes annually and depends on whether you are single, married, self-employed, or over 65. If you earned less than the threshold for your situation, you generally do not have to file — but there are exceptions where filing benefits you even when you are not required to.

The IRS publishes the current income thresholds on its website each January. For 2024, a single person under 65 must file if they earned more than $14,600 in wages. A married couple filing jointly must file if their combined income exceeded $29,200. These numbers increase slightly each year to account for inflation, and they are higher if you are 65 or older or if you are self-employed.

Even if your income is below the threshold, you may want to file anyway. If your employer withheld taxes from your paychecks, filing a return is how you get that money back. The same applies if you are owed a tax credit like the Earned Income Tax Credit or the Child Tax Credit — you must file to receive it.

Key Takeaways

  • The IRS sets an annual income threshold; if you earned less than that amount for your filing status, you are not required to file, but you may still benefit from doing so.
  • If your employer withheld taxes from your pay, filing a return is the only way to recover that money as a refund.
  • You must file if you are self-employed and earned $400 or more in net profit, regardless of your total income.
  • Tax credits like the Earned Income Tax Credit and Child Tax Credit require you to file a return to claim them, even if your income is below the filing threshold.
  • Your state may have its own filing requirements that differ from the federal threshold.

Income thresholds for 2024 by filing status

The IRS income threshold for filing a federal return varies based on your age and filing status. For the 2024 tax year (filed in 2025), a single person under 65 must file if their gross income was $14,600 or more. A single person 65 or older has a lower threshold of $18,350. These thresholds apply to wages, salaries, tips, and other earned income.

For married couples filing jointly, the threshold is $29,200 if both spouses are under 65, and $30,750 if one spouse is 65 or older. If you are married filing separately, the threshold is much lower — $5 for either spouse — which means nearly all married couples filing separately must file. Head of household filers (usually single parents) must file if their income was $21,900 or more, or $27,700 if they are 65 or older.

These thresholds apply only to earned income like wages and salaries. If you have unearned income — such as interest, dividends, or capital gains — the rules are different and often require filing at lower income levels. Check the IRS website or use the IRS Interactive Tax Assistant tool to confirm your specific situation, since thresholds change each year.

Self-employment income and the $400 rule

If you are self-employed, the filing requirement is different. You must file a federal tax return if your net self-employment income was $400 or more, regardless of your age or other income. This applies whether you work full-time as a freelancer, run a side business, or earn money through gig work like driving or delivery services.

Self-employment income includes profit from a business, rental income, and earnings from contract work. You calculate net self-employment income by subtracting your business expenses from your gross income. Even if your net profit is only slightly above $400, you are required to file. Filing is also how you pay self-employment tax, which covers Social Security and Medicare contributions for self-employed people.

If your self-employment income is below $400 but you had other income that pushes you above the regular filing threshold for your status, you still must file. For example, if you earned $350 in self-employment income and $14,300 in W-2 wages as a single person under 65, your total income exceeds the $14,600 threshold, so you must file.

When filing returns money to you even if you are not required

Filing a tax return is optional if your income is below the threshold — but it is often worth doing anyway. The most common reason is a refund. If your employer withheld federal income tax from your paychecks, that money belongs to you until you file a return and claim it. The IRS holds that money interest-free until you file, so delaying costs you.

Tax credits are another reason to file even when you are not required. The Earned Income Tax Credit (EITC) can return hundreds or thousands of dollars to low-income workers and families, but you must file a return to claim it. The Child Tax Credit, the American Opportunity Tax Credit for education, and other credits also require filing. Many people who are not required to file end up receiving larger refunds than their withholding alone would suggest, because of these credits.

If you have investment income like capital gains or losses, filing may help you. You can use capital losses to offset other income and reduce your tax bill in future years, but only if you file a return reporting them. Some people also file to establish a record of income for loan applications or other purposes, even when filing is not legally required.

State tax filing requirements may differ from federal

Many states have their own income tax and their own filing thresholds, which are often lower than the federal threshold. Some states do not have income tax at all, but others require you to file even if you owe no tax, simply to report your income. A few states require filing if you received state tax withholding from your paychecks, regardless of your income level.

If you lived in more than one state during the year, you may have to file in multiple states. If you moved during the year, you may owe tax to both your old state and your new state. Check your state's tax agency website or contact them directly to learn the filing requirement for your situation, since it may not match the federal rule.

Some states offer credits or refunds that require filing, just as the federal government does. For example, some states have their own version of the Earned Income Tax Credit. Filing a state return is often the only way to claim these benefits, even if you are not required to file federally.

What happens if you do not file when you are required to

If you are required to file and do not, the IRS can assess penalties and interest on any tax you owe. The failure-to-file penalty is usually 5 percent of the unpaid tax for each month you are late, up to 25 percent total. If you owe no tax — for example, because your withholding covered your liability — the penalty does not apply, but you still miss out on any refund you are owed.

The IRS has a statute of limitations on refunds. If you are owed a refund but do not file within three years, the IRS keeps the money. This is one of the strongest reasons to file even if you are not required to: if you had taxes withheld and do not file, you lose that refund permanently after three years.

If you are unsure whether you are required to file, it is safer to file anyway. Filing when you are not required carries no penalty, and it protects your right to any refund or credits you may be owed. The IRS also uses filed returns to verify income for Social Security benefits, student loans, and other programs, so filing can matter for reasons beyond taxes.

How to learn about you must file

The IRS provides an Interactive Tax Assistant tool on its website that walks you through questions about your income, age, and filing status and tells you whether you must file. This tool is updated each year with the current thresholds and is free to use. You can also download IRS Publication 17, which contains detailed filing requirements and examples for different situations.

If you have a complicated situation — such as multiple jobs, self-employment income, investment income, or income from multiple states — consider speaking with a tax professional. Many libraries and community organizations offer free tax help through the Volunteer Income Tax Assistance (VITA) program, which can answer questions about whether you must file and help you file if you choose to.

Keep records of all income you received during the year, including W-2 forms from employers, 1099 forms from clients or financial institutions, and receipts for self-employment income and expenses. Having these documents ready makes it easy to determine your filing requirement and to file accurately if you decide to do so.

Frequently Asked Questions

Do I have to file if I am a dependent on my parents' tax return?

You may still have to file even if your parents claim you as a dependent. The threshold is different for dependents and is usually lower than for independent filers. Check the IRS website or use the Interactive Tax Assistant to determine your requirement based on your income and dependent status.

What if I earned money but had no taxes withheld?

If you earned income but your employer did not withhold taxes, you are not required to file unless your income exceeds the threshold for your filing status. However, you may owe tax on that income when you file, so filing is important to settle your tax liability and avoid penalties and interest.

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

Social Security benefits are generally not counted as income for the filing threshold, so most people who receive only Social Security do not have to file. However, if you also had other income, you may be required to file. Some people file anyway to claim the Earned Income Tax Credit or other credits they may be owed.

Can I file even if I am not required to?

Yes. Filing is always optional if you are below the income threshold, but it is often beneficial. If you had taxes withheld, filing gets you a refund. If you are owed a tax credit, filing is the only way to claim it. Filing also protects your right to any refund within the three-year window.

What if I am not sure whether I earned enough to file?

If you are unsure, file anyway. Filing when you are not required carries no penalty, and it ensures you do not miss a refund or credit. The IRS Interactive Tax Assistant can help you determine your requirement, or you can contact a VITA program for free help.