Who Must File a 2025 US Tax Return?
Federal filing requirements for 2025 depend on gross income, filing status, age, dependency status and special rules including net self-employment earnings.
Timeline
- December 31, 2025: Filing status and age at year-end help determine the applicable threshold.
- April 15, 2026: Most 2025 individual federal returns were due unless an exception or extension applied.
Whether a U.S. citizen or resident alien must file a 2025 federal income-tax return generally depends on gross income, filing status, age and whether another person can claim the taxpayer as a dependent. Special circumstances can require a return even when income falls below the ordinary table threshold. [1][2]
For most taxpayers under 65, Publication 501 lists thresholds of $15,750 for single filers, $23,625 for heads of household, and $31,500 for married couples filing jointly when both spouses are under 65. The threshold for married filing separately is $5, regardless of age. [2]
Higher table thresholds apply when a filer is at least 65. For example, the 2025 single threshold is $17,750, while joint thresholds vary depending on whether one or both spouses meet the age rule. The IRS generally treats someone born before January 2, 1961 as 65 or older for this purpose. [2]
Dependents use separate earned-income and unearned-income tests rather than simply applying the main table. Taxable interest, dividends and capital-gain distributions can change the result. A student or child with income should therefore check the dependent table even when wages appear lower than the standard single-filer threshold. [2]
A return is required when net earnings from self-employment reach at least $400. Other special filing triggers include certain household-employment taxes, distributions from specified medical savings accounts and advance premium-tax-credit payments. These rules explain why gross income alone cannot settle every case. [1][2]
Someone who is not required to file may still benefit from filing. A return can claim a refund of federal income tax withheld or refundable credits for which the person qualifies. Filing voluntarily is different from being legally required, and eligibility for a credit has its own rules. [1][2]
State filing rules can differ from federal requirements. Nonresident aliens, deceased taxpayers, disaster-affected taxpayers and people with unusual income may also need different instructions. Publication 501 and the current Form 1040 instructions should control the federal determination for an individual situation. [1][2]