Updated October 19, 2026. Quick answer: Publication 501 is the IRS guide to filing basics: who must file, which filing status applies, who counts as a dependent and the standard deduction. The edition on irs.gov is for 2025 returns.
Quick reference
| Item | As the IRS publication states it |
|---|---|
| Single, under 65: file if gross income was at least (Table 1) | $15,750 |
| Single, 65 or older: file if gross income was at least (Table 1) | $17,750 |
| Married filing jointly, both under 65 (Table 1) | $31,500 |
| Head of household standard deduction (Table 6) | $23,625 |
| Maximum enhanced deduction for seniors (Standard Deduction) | $6,000 |
| Gross income at which a person usually can’t be a dependent (Dependents) | $5,200 |
What the publication covers
The first page of the web edition reads “For use in preparing 2025 Returns”. The introduction says “This publication discusses some tax rules that affect every person who may have to file a federal income tax return.” It also says “It answers some basic questions: who must file, who should file, what filing status to use, who qualifies as a dependent, and the amount of the standard deduction.”
The main sections are Who Must File, Who Should File, Filing Status, Dependents, Standard Deduction and Who Should Itemize. Filing Status covers single, married filing jointly, married filing separately, head of household and qualifying surviving spouse. The back of the publication has the 2025 Standard Deduction Tables and a section on the Enhanced Deduction for Seniors.
Who must file
The IRS publication says “If you are a U.S. citizen or resident alien, whether you must file a federal income tax return depends on your gross income, your filing status, your age, and whether you are a dependent.” It adds “The filing requirements apply even if you owe no tax.”
Table 1, 2025 Filing Requirements Chart for Most Taxpayers, gives the gross income figure by filing status and age. A footnote to the table says “If you were born before January 2, 1961, you’re considered to be 65 or older at the end of 2025.” Table 2 covers dependents, and Table 3 lists other situations when you must file.
Dependents
The publication separates a qualifying child from a qualifying relative. It says “You can’t claim a person as a dependent unless that person is your qualifying child or qualifying relative.” For a child it says “Five tests must be met for a child to be your qualifying child.”
On gross income the publication says “If your gross income was $5,200 or more, you usually can’t be claimed as a dependent unless you are a qualifying child.” Table 5 gives an overview of the rules for claiming a dependent, and Worksheet 2 is for determining support.
Standard deduction and the senior deduction
The publication says “Most taxpayers have a choice of either taking a standard deduction or itemizing their deductions.” Table 6 is the chart for most people, Table 7 is for people born before January 2, 1961, or who are blind, and Table 8 is the worksheet for dependents. Of Table 8 the publication says “Use this worksheet only if someone else can claim you (or your spouse if filing jointly) as a dependent.”
The enhanced deduction for seniors is separate from the higher standard deduction. The IRS publication says “The maximum amount of the deduction is $6,000 ($12,000 if married filing jointly and both spouses are eligible).” It also says “The deduction will be limited if your modified adjusted gross income is more than $75,000 ($150,000 if married filing jointly).”
Where to go next
This site has pages on the 2025 standard deduction and the 2026 standard deduction, on Form 1040 line 12, and on Schedule A for itemizers. For dependents, see claiming a grandchild as a dependent and head of household with a parent.
Where this comes from
The IRS page About Publication 501 opens with “Publication 501 discusses some tax rules that affect every person who may have to file a federal income tax return.” It links the PDF and eBook editions and the earlier revisions of the publication.
This page describes the web edition of Publication 501 (2025), Dependents, Standard Deduction, and Filing Information, as served on irs.gov on October 19, 2026. The IRS can revise a publication after we read it, and the IRS page controls. General information, not tax or legal advice.
Common mistakes
- Treating the gross income figure in Table 1 as taxable income. The table is keyed to gross income, and a footnote defines gross income as all income received that isn’t exempt from tax.
- Using the Table 6 amounts when a person is 65 or older, blind, or claimed as a dependent. Table 6 itself says not to use it in those cases and points to Table 7 or Table 8.
- Assuming the filing requirement depends on owing tax. The publication says the requirements apply even if you owe no tax.
- Mixing up the two senior items. The enhanced deduction for seniors is described as in addition to the higher standard deduction for people 65 or older.
Related: IRS publications by number, 2025 standard deduction, 2026 standard deduction, Form 1040 line 12, Schedule A, Claiming a grandchild as a dependent, Head of household with a parent, and Kiddie tax.
Sources
- IRS, Publication 501 (2025), Dependents, Standard Deduction, and Filing Information (irs.gov): https://www.irs.gov/publications/p501
- IRS, About Publication 501 (irs.gov): https://www.irs.gov/forms-pubs/about-publication-501
Read from the IRS pages linked above on October 19, 2026. General information, not tax or legal advice. The IRS publication and the instructions for your own form control, and your own facts decide the outcome.