Rules for every dependent
- You cannot claim any dependents if you, or your spouse if filing jointly, could be claimed as a dependent by another taxpayer, unless that taxpayer files only to claim a refund.
- You cannot claim a married person who files a joint return, unless the joint return is filed only to claim a refund of withheld or estimated tax.
- The person must be a US citizen, US resident alien, US national, or a resident of Canada or Mexico.
- The person must be your qualifying child or your qualifying relative.
The two sets of tests
| Test | Qualifying child (all five) | Qualifying relative (all four) |
|---|---|---|
| Relationship | son, daughter, stepchild, foster child, brother, sister, half or step sibling, or a descendant of any of them | related in one of the ways listed under relatives who do not have to live with you, or lived with you all year as a member of your household |
| Age | under 19 at year end and younger than you (or your spouse if filing jointly); under 24, a student and younger than you; or any age if permanently and totally disabled | no age test |
| Residency | lived with you more than half the year | covered by the relationship test |
| Support | did not provide more than half of their own support | you provided more than half of their total support |
| Income | no income test | gross income under $5,200 for 2025 |
| Other | not filing a joint return, except only for a refund | not your qualifying child or anyone else's |
The residency test has exceptions Publication 501 spells out: temporary absences for special circumstances such as illness, education or business count as time living with you, and there are rules for children born or who died during the year, adopted and foster children, and children of divorced or separated parents.
The support test, worked
The two support tests point in opposite directions. For a qualifying child the question is whether the child paid for more than half of their own support; for a qualifying relative, whether you paid more than half. Publication 501's example for a child:
| Support for a 16-year-old | Amount |
|---|---|
| Provided by you | $4,000 |
| Provided by the child | $6,000 |
| Child's share of total support | 60% |
| Result | the child provided more than half, so is not your qualifying child |
Publication 501's Worksheet 2 helps total the support, and the section on the qualifying relative support test lists what counts as support and what does not.
When two people can claim the same child
Publication 501 says that if a child meets the rules to be a qualifying child of more than one person, generally only one person can treat the child as a qualifying child for the related tax benefits. If the people involved cannot agree, the tiebreaker rules decide:
- If only one of them is the child's parent, the child is the parent's qualifying child. Parent here means a biological or adoptive parent, not a stepparent or foster parent who has not adopted.
- If the parents file a joint return together, the child is their qualifying child.
- If the parents file separately and both claim the child, the IRS treats the child as the qualifying child of the parent the child lived with longer during the year.
The publication's further rules cover the case where the child lived with each parent for the same amount of time.
What depends on it
- The child tax credit for a qualifying child under its own age and other rules: child tax credit 2026.
- Head of household filing status, which needs a qualifying person: tax filing status explained.
- The child and dependent care credit for care of a qualifying person: child and dependent care credit.
- The Earned Income Tax Credit has its own qualifying child rules: Earned Income Tax Credit 2026.
The income tax calculator and paycheck calculator show how a change in filing status or dependents moves the tax. This guide follows IRS Publication 501 for 2025 returns; the 2026 edition carries the 2026 gross income figure for a qualifying relative.
Frequently asked questions
Who can I claim as a dependent?
A qualifying child or a qualifying relative, per IRS Publication 501. Some rules apply to every dependent: you cannot claim anyone if you, or your spouse on a joint return, could be claimed as someone else's dependent; you cannot claim a married person who files a joint return, unless only to claim a refund; and the person must be a US citizen, US resident alien, US national, or a resident of Canada or Mexico.
What are the tests for a qualifying child?
Five, per Publication 501: relationship (your son, daughter, stepchild, foster child, sibling, half or step sibling, or a descendant of any of them); age (under 19 at year end and younger than you, under 24 and a student, or any age if permanently and totally disabled); residency (lived with you more than half the year); support (did not provide more than half of their own support); and joint return (not filing jointly, except only for a refund).
Can I claim a parent or other adult as a dependent?
As a qualifying relative, if four tests are met: the person is not anyone's qualifying child; is related to you in one of the listed ways or lived with you all year as a member of your household; had gross income under $5,200 for 2025; and you provided more than half of their total support. A parent does not have to live with you, since a parent is among the relatives who do not have to.
What if two people can claim the same child?
Generally only one can. Publication 501's tiebreaker rules say that if only one of them is the child's parent, the child is the parent's qualifying child; if the parents file jointly, the child is theirs; and if the parents file separately and both claim the child, the IRS treats the child as the qualifying child of the parent the child lived with longer during the year.
What does claiming a dependent get me?
Several tax benefits depend on it, including the child tax credit for a qualifying child, head of household filing status, and the child and dependent care credit. Each has its own extra conditions, set out in its own guide on this site, so a person can be your dependent and still not bring every benefit.
Sources
General information based on the sources above, not tax, legal or financial advice.