You are required to file a federal income tax return under 26 U.S.C. § 6012 if your gross income for the year meets the threshold set for your filing status and age, or if you fall into one of several special categories that trigger a filing obligation regardless of what you earned.1Office of the Law Revision Counsel. 26 USC 6012 – Persons Required to Make Returns of Income For most people, the threshold equals the standard deduction. For self-employed workers, people who received advance health insurance subsidies, and a few other groups, the trigger is much lower or unrelated to income entirely.
Income Thresholds for Tax Year 2025
Gross income means everything you received during the year that isn’t specifically tax-exempt: wages, business revenue, investment returns, rental income, and the like. Municipal bond interest and other tax-exempt items don’t count. If your gross income meets or exceeds the number below for your situation, you must file a return for tax year 2025 (the return you file in early 2026).2Internal Revenue Service. Publication 501, Dependents, Standard Deduction, and Filing Information
- Single, under 65: $15,750
- Single, 65 or older: $17,750
- Head of household, under 65: $23,625
- Head of household, 65 or older: $25,625
- Married filing jointly, both under 65: $31,500
- Married filing jointly, one spouse 65 or older: $33,100
- Married filing jointly, both 65 or older: $34,700
- Married filing separately, any age: $5
- Qualifying surviving spouse, under 65: $31,500
- Qualifying surviving spouse, 65 or older: $33,100
The $5 threshold for married filing separately is not a typo. Any married person who chooses to file separately from their spouse must file a return, because separate filing bypasses the income-matching built into a joint return.3Internal Revenue Service. Publication 554, Tax Guide for Seniors
The 65-and-older thresholds apply if you turned 65 before January 2, 2026. The additional standard deduction for age adds $2,000 for single and head-of-household filers, and $1,600 for married filers and qualifying surviving spouses. On a joint return where both spouses are 65 or older, the couple gets both $1,600 amounts, which is why their threshold climbs to $34,700.4Internal Revenue Service. Topic No. 551, Standard Deduction
Dependents
If someone else claims you as a dependent on their return, your thresholds are lower and split by income type. For 2025, a single dependent under 65 must file if any of the following is true:2Internal Revenue Service. Publication 501, Dependents, Standard Deduction, and Filing Information
- Unearned income (interest, dividends, capital gains) is more than $1,350.
- Earned income (wages, tips, salary) is more than $15,750.
- Combined gross income is more than the larger of $1,350, or earned income up to $15,300 plus $450.
A dependent who is 65 or older, or blind, gets higher thresholds. A single dependent aged 65 or older must file when unearned income exceeds $3,350 or earned income exceeds $17,750. Dependents also must file if they owe special taxes, such as the additional tax on an early retirement account distribution, no matter how little they earned.
Situations That Require Filing Regardless of Income
Self-Employment Earnings of $400 or More
If your net earnings from self-employment reach $400, you must file. That is one of the lowest triggers in the tax code, and it applies no matter what your filing status is or whether you would otherwise owe any income tax.5Internal Revenue Service. Self-Employed Individuals Tax Center Net earnings means business revenue minus deductible business expenses, reported on Schedule C, with self-employment tax calculated on Schedule SE at a combined Social Security and Medicare rate of 15.3%.6Internal Revenue Service. Topic No. 554, Self-Employment Tax
Advance Premium Tax Credits
If the health insurance marketplace paid advance premium tax credits toward your coverage during the year, you must file a return to reconcile those payments, even if your income is below the normal threshold.7Internal Revenue Service. Reconciling Your Advance Payments of the Premium Tax Credit Reconciliation happens on Form 8962, attached to your return.8Internal Revenue Service. 2025 Instructions for Form 8962 Premium Tax Credit Skip it, and the IRS can demand repayment of the advance credits, and the marketplace can stop advancing subsidies until you show you reconciled.
Married Filing Separately
As noted above, the $5 threshold effectively means anyone who elects married filing separately status must file.
Special Taxes Owed
Certain taxes create a filing obligation on their own. The additional tax on early retirement account distributions is the most common example, but the same principle covers other special taxes that the IRS needs a return to collect.
How Social Security Benefits Factor In
Social Security benefits usually don’t count as gross income for the filing threshold. They start counting only if your combined income (half your benefits plus all your other income, including tax-exempt interest) exceeds $25,000 as a single filer or $32,000 as a married couple filing jointly. Above those levels, part of your benefits becomes taxable and does count toward whether you must file.9Internal Revenue Service. Social Security Income
One exception matters. If you are married filing separately and lived with your spouse at any point during the year, your Social Security benefits are always included in gross income, regardless of the amount.2Internal Revenue Service. Publication 501, Dependents, Standard Deduction, and Filing Information
U.S. Citizens and Residents Living Abroad
The United States taxes citizens and resident aliens on worldwide income, no matter where they live. If your global gross income meets the regular filing threshold for your status, you must file.10Internal Revenue Service. Foreign Earned Income Exclusion The Foreign Earned Income Exclusion lets qualifying taxpayers exclude up to $130,000 of foreign earnings for tax year 2025, rising to $132,900 for 2026, but claiming the exclusion doesn’t remove the filing requirement.11Internal Revenue Service. Figuring the Foreign Earned Income Exclusion You still submit a return with Form 2555 attached so the IRS can verify eligibility. Only if your gross income before applying the exclusion falls below the threshold are you off the hook.
Filers living abroad get an automatic two-month extension, to June 16 for calendar-year filers, without having to request one. Interest on any unpaid tax still runs from the original April deadline.12Internal Revenue Service. Application for Automatic Extension of Time to File US Individual Income Tax Return
Filing for Someone Else
A guardian or court-appointed representative must file a return on behalf of someone who cannot manage their own tax affairs. The normal filing thresholds apply based on that person’s age and filing status, and the fiduciary signs Form 1040 in a representative capacity.
When a taxpayer dies, someone still needs to file the final return if the person’s income met the regular thresholds. The return covers January 1 through the date of death and is due by the normal April deadline of the following year.13Internal Revenue Service. Publication 559, Survivors, Executors, and Administrators An appointed personal representative signs. If none has been appointed and the surviving spouse files a joint return, the spouse signs and writes “filing as surviving spouse” in the signature area. If there is no representative and no surviving spouse, whoever is managing the deceased’s property signs as “personal representative.” Write “DECEASED,” the person’s name, and the date of death across the top of the return. A joint return with the surviving spouse is allowed for the year of death, but not if that spouse remarried before year-end.14Internal Revenue Service. Filing a Final Federal Tax Return for Someone Who Has Died
When You Should File Even If You Don’t Have To
Falling below the threshold doesn’t always mean skipping the return is the right call. If your employer withheld federal income tax from your paychecks, filing is the only way to get that money back. Several refundable credits can also pay out cash even when you owe no tax:15Internal Revenue Service. Refundable Tax Credits
- The Earned Income Tax Credit, worth up to $8,046 for a family with three or more children in tax year 2025. Income limits range from $19,104 for a single filer with no children to $68,675 for married filing jointly with three or more children.16Internal Revenue Service. Earned Income and Earned Income Tax Credit Tables
- The Additional Child Tax Credit, refundable up to $1,700 per qualifying child for 2025.
- The American Opportunity Tax Credit, refundable up to $1,000.
You have three years from the original due date of a return to claim a refund. Miss that window and the money is gone for good.17Internal Revenue Service. Time You Can Claim a Credit or Refund For a 2025 return normally due April 15, 2026, that means filing by April 15, 2029, to collect anything owed to you.
Deadlines and What Happens If You Don’t File
The deadline for a 2025 individual return is April 15, 2026.18Internal Revenue Service. IRS Opens 2026 Filing Season Filing Form 4868 gives you an automatic six-month extension to October 15, 2026. An extension to file is not an extension to pay. Any tax owed is still due April 15, and paying late means interest from that date plus a monthly late-payment penalty.19Internal Revenue Service. IRS – Need More Time to File, Request an Extension
The failure-to-file penalty is 5% of the unpaid tax for each month or partial month a return is late, capped at 25%.20Internal Revenue Service. Failure to File Penalty The failure-to-pay penalty is 0.5% per month. If a return is more than 60 days late, the minimum penalty becomes the lesser of $525 or 100% of the tax owed. Interest compounds daily at the federal short-term rate plus three percentage points.
Willful failure to file is a misdemeanor under 26 U.S.C. § 7203, carrying up to one year in prison and a fine of up to $25,000.21Office of the Law Revision Counsel. 26 USC 7203 – Willful Failure to File Return, Supply Information, or Pay Tax If the non-filing is part of a broader scheme to evade taxes, felony charges are possible.
One point worth knowing if you have unfiled years behind you: there is no statute of limitations on assessment for a return that was never filed. The IRS can pursue the tax, penalties, and interest indefinitely. Filing the return, even years late, starts the normal three-year assessment clock, so late filing is always better than no filing. If a filing penalty is your first, you may qualify for first-time abatement if you filed the same type of return on time for the three preceding years with no penalties.22Internal Revenue Service. Administrative Penalty Relief A phone call or written request is enough; no special form is required.