A dependent, for federal income tax purposes, is a qualifying person you support whose relationship to you meets IRS-defined tests. The IRS divides dependents into two categories: qualifying child and qualifying relative. Each has its own set of tests. Claiming a dependent may make you eligible for certain tax credits and deductions, which the IRS defines and adjusts annually.
What is the qualifying child test?
To be claimed as a qualifying child, a person must meet all five of the following tests as defined by the IRS:
- Relationship test — the child must be your son, daughter, stepchild, foster child, sibling, half-sibling, stepsibbling, or a descendant of any of these (such as a grandchild or niece/nephew).
- Age test — the child must be under age 19 at the end of the year, or under 24 if a full-time student, or any age if permanently and totally disabled.
- Residency test — the child must have lived with you for more than half the tax year. Temporary absences (school, vacation, medical care) generally count as time lived with you.
- Support test — the child must not have provided more than half of their own financial support during the year.
- Joint return test — the child cannot file a joint return with a spouse for that year, unless the joint return is filed only to claim a refund and no tax liability would otherwise exist for either spouse.
A person can generally be the qualifying child of only one taxpayer in a given year. Tiebreaker rules in the IRS guidance determine which taxpayer may claim the child when more than one person could otherwise qualify.
What is the qualifying relative test?
If a person does not meet the qualifying child tests, they may still qualify as a qualifying relative. The IRS applies four tests:
- Not a qualifying child test — the person cannot be your qualifying child or the qualifying child of any other taxpayer.
- Member of household or relationship test — the person must either live in your home all year as a member of your household or be related to you in one of the ways listed in IRS guidance (parent, grandparent, sibling, aunt, uncle, in-law, and others — relationships by marriage generally count even after the marriage ends in death or divorce).
- Gross income test — the person's gross income for the year must be below a threshold the IRS sets and adjusts annually.
- Support test — you must have provided more than half of the person's total financial support for the year.
Can only one person claim the same dependent?
Generally, yes — a dependent can be claimed on only one return per year. When two taxpayers both believe they qualify to claim the same person, the IRS applies tiebreaker rules (outlined in IRS Publication 501) to determine who has the prior claim. Divorced or separated parents sometimes use a written declaration (Form 8332) to release the dependency claim to the other parent for a given year.
What credits are connected to dependents?
Several federal tax credits are tied to qualifying dependents. These include the Child Tax Credit, the Credit for Other Dependents, the Earned Income Tax Credit (which has its own qualifying child definition), the Child and Dependent Care Credit, and the American Opportunity and Lifetime Learning Credits for eligible students. The rules, income limits, and credit amounts for each are set by the IRS and can change annually.
| Dependent type | Key threshold | Common associated credits |
|---|---|---|
| Qualifying child | Age under 19 (or 24 if student) | Child Tax Credit, EITC, Child and Dependent Care Credit |
| Qualifying relative | Gross income below IRS annual limit | Credit for Other Dependents |
Does a dependent need a Social Security number?
For most purposes, yes. The IRS requires valid taxpayer identification numbers (typically Social Security numbers) for dependents claimed on a return to be eligible for most credits. Individual Taxpayer Identification Numbers (ITINs) satisfy some but not all credit eligibility requirements. IRS Publication 501 and the instructions for each relevant credit form specify what identification is required.
Where to get help
Dependency rules interact with multiple areas of tax law, including who files the return, which credits apply, and how support is calculated. A tax professional can review your specific household situation and help you understand how the rules apply. Find a tax professional.
Sources
Internal Revenue Service — irs.gov (IRS Publication 501, Dependents, Standard Deduction, and Filing Information)