Do I Have to File a Tax Return?

Do I have to file a tax return?

For 2025: you must file if your gross income is more than your standard deduction. That is $15,750 for a single filer under 65, $23,625 for head of household, and $31,500 of combined income on a joint return, and being 65 or older or blind raises it (IRC §6012(f)). For 2026: you must file if your gross income reaches the basic standard deduction for your filing status ($16,100 single) plus one extra amount for each person 65 or older; for a married couple, the test uses combined income against $32,200 (IRC §6012(a)(1)). If you are married, you must file with any gross income when you and your spouse lived apart at year end or your spouse files a separate return. A married person who qualifies to file as head of household uses the head-of-household amount instead.

What counts as gross income?

All income you receive in money, goods, property, and services that is not exempt from tax, before any deduction. Include income from outside the United States, gain from selling your main home even when you can exclude it, and income you exclude as foreign earned income (IRC §6012(c)). Gains count, and losses, including a business loss, do not reduce it. Do not enter your taxable income.

Do Social Security benefits count?

Only when the benefits are taxable in part. They stay out of gross income unless you file separately and lived with your spouse at any time in the year, or half your benefits plus your other income and tax-exempt interest exceeds $25,000 ($32,000 on a joint return). Our Social Security taxability calculator finds the taxable part.

Why is the threshold the same as the standard deduction?

The statute ties the two together, and the rule differs by year. For 2025, IRC §6012(f)(1) excuses a return when gross income does not exceed your full standard deduction, so the extra amounts for age 65 and for blindness both raise the threshold. For 2026, IRC §6012(a)(1)(A) excuses a return when gross income is less than the basic standard deduction. §6012(a)(1)(B) adds one amount for age 65 or older (one for each spouse 65 or older on a joint return) but none for blindness. So for 2026 a blind single filer under 65 with gross income from $16,100 up to $18,150 must file, even though the standard deduction covers that income and no tax is due. The separate deduction for seniors (up to $6,000 each, IRC §151(d)(5)(C)) does not raise the threshold in either year, so a filer 65 or older can have to file and still owe no tax.

What if someone can claim me as a dependent?

IRC §63(c)(5) limits your own standard deduction to the greater of $1,350 or your earned income plus $450, plus any age and blindness amounts. For 2025, an unmarried dependent must file if earned plus unearned income is more than that limited amount (IRC §6012(f)(1)). Pub. 501 Table 2 splits that rule into three tests. For head of household or a qualifying surviving spouse, Table 2 uses the single-filer amounts. The result tells you when that changes your answer. For 2026, an unmarried dependent must file if unearned income is more than $1,350 plus the age and blindness amounts, or gross income is more than the limited standard deduction (IRC §6012(a)(1)(C)). The IRS has not published its 2026 dependent table, and if you read the law word for word, it can require a return at a slightly lower amount; the result tells you when that could change your answer. For 2025, a married dependent follows only the married rules below. For 2026, the law excuses a married dependent only when neither the married rules nor the dependent tests require a return.

What are the rules for married people?

If you are married and you lived apart at year end, or your spouse files a separate return, $1 of gross income means you must file. (A married person who qualifies to file as head of household uses the head-of-household amount instead.) For 2025, IRC §6012(f)(2) excuses a married person only if all of these hold: you and your spouse lived in the same household at year end, your spouse files no separate return, your combined gross income does not exceed the joint standard deduction ($31,500 plus age and blindness amounts), and neither of you is a dependent with more than $1,350 of unearned income. Otherwise any gross income requires a return. Pub. 501 (2025) Table 1 prints $5 for married filing separately, but the statute sets no $5 amount, so this calculator follows the statute. For 2026, IRC §6012(a)(1)(A)(iv) works the same way: combined income below $32,200 plus age amounts, the same household at year end, no separate return by your spouse, and no one else able to claim your spouse as a dependent. If someone else can claim you as a dependent, your spouse cannot use that joint-income rule for 2026. Watch the trap: if one of you files a separate return, even just for a refund, the other one then has to file too if they had any gross income. If you want a refund, file one joint return together. But if someone else claims either of you as a dependent, a joint return usually ends that claim (IRC §152(b)(2)). When neither of you must file, and you file a joint return just to get back tax your employer took out of your pay, or estimated tax you paid, the claim can stay. If you file it to claim a credit, the claim ends (Pub. 501, Joint Return Test; for a qualifying child, IRC §152(c)(1)(E)).

I owe tax on something small. Do I have to file even below the threshold?

Often yes. Table 3 of Pub. 501 lists situations that require a return at any income, such as self-employment earnings of $400 or more, alternative minimum tax, an additional tax on an IRA, health savings account distributions, and advance premium tax credit payments. The calculator asks about each.

What if I am not required to file?

You may still want to. A return is how you claim a refund of tax withheld from your pay, estimated tax payments, and refundable credits such as the earned income credit, the additional child tax credit, the refundable American opportunity credit, and the premium tax credit.

What happens if I do not file when I should?

If you owe no tax, for example because your withholding covered it, there is no penalty for filing late. But if your employer took tax out of your pay, or you paid estimated tax, you have 3 years from the return’s original due date to file and get that money back. If you got an extension to file, add that extra time. After that, you usually cannot get it back (IRC §6511(b)(2)(A); §6513(b)). A few exceptions can extend the deadline. One covers time served in a combat zone (IRC §7508(a)(1)(E)). Another covers a serious illness or disability that kept you from handling your money for at least a year, or that is likely to end in death; you must send the IRS proof, and it does not count for any time when someone else, such as your spouse, could handle your money for you (IRC §6511(h)). If you owed tax, the late-filing penalty is 5% of the unpaid tax for each month or part of a month the return is late, up to 25% (IRC §6651(a)(1), (b)(1)), so file as soon as you can. In a month when you also owe the late-payment penalty, the IRS reduces the late-filing penalty by that month’s late-payment penalty (IRC §6651(c)(1)). If the return is more than 60 days late, the late-filing penalty is at least a set minimum that changes each year, or all of the unpaid tax if that is less (IRC §6651(a), last sentence). Criminal charges apply only to someone who fails to file on purpose, knowing they had to (IRC §7203). If you did not file a required return, our IRS notices library explains the letters the IRS sends.

Is this calculator free?

Yes. It is free, with no signup, and it shows every test with its citation.