You must file a tax return once your income reaches a certain threshold, and that threshold depends on your age and filing status
The age at which you owe federal income tax is not a fixed number. Instead, the IRS sets an annual income threshold — if your earnings cross it, you file a return. That threshold changes each year and varies based on whether you are a dependent, single, married, or self-employed. A 16-year-old with a summer job may owe taxes; a 65-year-old retiree living on Social Security alone may not.
The key is your gross income — the total you earned before deductions. If it exceeds the threshold for your situation, you file. If it falls below, you generally do not have to file, though you may want to anyway to claim a refund.
Key Takeaways
- The age you start paying taxes is determined by your income level, not a specific birthday — the IRS sets annual thresholds that change each year.
- A dependent claimed on a parent's return has a lower income threshold than an independent adult, so a teenager with a job may owe taxes while a retired parent does not.
- Self-employed people owe taxes on net earnings of $400 or more, regardless of age, and must file even if they fall below the standard threshold.
- You may owe taxes on unearned income like interest or dividends at a lower threshold than wages, and the rules differ if you are under 18.
- Filing a return when you do not owe can still benefit you if taxes were withheld from your paychecks, since you may receive a refund.
Income thresholds for dependents versus independent filers
If you are claimed as a dependent on someone else's tax return — usually a parent — your threshold is lower. For 2024, a dependent with only wage income must file if their gross income exceeds $14,600. That number rises each year with inflation. A dependent with unearned income (interest, dividends, capital gains) has a threshold of $1,300, which is much lower.
If you are independent — not claimed as a dependent — the threshold is higher. For 2024, a single person under 65 must file if gross income exceeds $14,600. Once you turn 65, the threshold rises to $17,550 because you may have access to for an additional standard deduction. These numbers explore to wage income; self-employment income has its own rule.
The thresholds the IRS publishes each January explore to the prior year's income. So when you file in April 2025, you use the 2024 thresholds to determine whether you owed taxes on 2024 earnings. The IRS website publishes the current year's thresholds in a table organized by age and filing status.
Self-employment income and the $400 rule
If you are self-employed — you run a business, freelance, or earn money outside a traditional job — the rule is simpler and stricter. You must file a federal return if your net self-employment income is $400 or more, regardless of your age or any other income you have. Net income means what you earned minus legitimate business expenses.
This applies even if you are a teenager with a side business, a retiree consulting part-time, or anyone in between. The $400 threshold does not change with inflation the way wage thresholds do. If you are self-employed and cross $400 in net income, you file and you owe self-employment tax (Social Security and Medicare tax), which is separate from income tax.
Unearned income and investment earnings
Money you earn from a job is earned income. Money that comes to you without work — interest from a savings account, dividends from stocks, capital gains from selling an investment — is unearned income. The tax rules treat them differently, and the threshold for unearned income is much lower.
For 2024, if you are a dependent with only unearned income, you must file if that income exceeds $1,300. If you have both earned and unearned income, the calculation is more complex — the IRS has a worksheet for this. Unearned income is taxed at your parents' rate if you are under 18 and meet certain conditions (called the "kiddie tax" rule), which can mean you owe more tax than you would otherwise.
If you are independent and have unearned income, the threshold is $1,300 for 2024, the same as for dependents. This is one area where age and dependency status do not change the rule.
What happens if you do not file when you should
If your income crosses the threshold and you do not file, the IRS may contact you. The penalty for failing to file is usually 5 percent of the unpaid tax for each month you are late, up to 25 percent total. If you owe no tax, there is no penalty, but the IRS may still send a notice asking why you did not file.
More importantly, if your employer withheld taxes from your paychecks and you do not file, you will not receive a refund. Many teenagers and young workers have taxes taken out but owe nothing because their income is below the threshold — filing gets that money back. If you do not file, that refund stays with the government.
Why you might file even if you do not have to
Even if your income falls below the filing threshold, you may benefit from filing. If you had taxes withheld from your paychecks — which is common for W-2 employees — filing a return can get you a refund. You can claim that refund only by filing.
You might also file to claim tax credits you are may have access to to, such as the Earned Income Tax Credit (EITC) if you have low income, or the American Opportunity Credit if you paid college tuition. These credits can result in a refund even if you owe no tax. Filing is free through the IRS Free File program if your income is below a certain level, or you can file on your own using tax software or paper forms.
State and local taxes may have different rules
Federal income tax is only part of the picture. Many states and some cities also collect income tax, and their thresholds may differ from the federal threshold. Some states have no income tax at all. A few states tax income below the federal threshold, so you could owe state tax even if you do not owe federal tax.
Check your state's tax authority website to learn the threshold for your state. If you live in a state with income tax and your income crosses that state's threshold, you file a state return separately from your federal return, even if you do not owe federal tax.
Frequently Asked Questions
Do I have to pay taxes if I am 16 and working a part-time job?
Only if your gross income exceeds the threshold for dependents, which is $14,600 for 2024. If you earned less, you do not have to file federally. However, if your employer withheld taxes, filing gets you a refund. Check your state's threshold too, as it may be lower.
What if I earned money from a side business as a teenager?
If your net self-employment income is $400 or more, you must file a federal return regardless of age. You will owe self-employment tax in addition to income tax. Keep records of what you earned and what you spent on the business.
Do I owe taxes on money my grandparents gave me as a gift?
Gifts are not taxable income to you, so they do not count toward your filing threshold. However, if the gift was in the form of investments that earn interest or dividends, that earned income does count. Only the earnings are taxable, not the original gift.
Can I file taxes before I turn 18?
Yes. There is no age requirement to file a tax return. If you earned income and meet the filing threshold, you can file at any age. If you are under 18, you may need a parent to sign the return or help you file, depending on how you file.
What if I am retired and over 65 — do I still have to file?
Only if your income exceeds the threshold for your age and status. For 2024, a single person over 65 must file if gross income exceeds $17,550. If you live on Social Security alone and have no other income, you likely do not have to file. If you have wages, pensions, or investment income, check whether you cross the threshold.