Qualifying child rules
Most of the EITC's value sits in the child columns: one child raises the 2025 maximum from $649 to $4,328, and three or more raise it to $8,046. That is why the IRS defines a qualifying child carefully, with four tests that must all be met. A child who fails any one of them cannot be counted — and only one person can claim the same child.
- Four tests: relationship, age, residency, and the joint-return rule.
- Age: under 19; under 24 if a full-time student; any age if permanently and totally disabled.
- Residency: the child must have lived with you in the US for more than half the year.
- Only one person can claim a child — tie-breaker rules decide who.
The four tests
1. Relationship. The child must be your son, daughter, stepchild, foster child, brother, sister, half- or step-sibling, or a descendant of any of those (for example, a grandchild or niece/nephew).
2. Age. At the end of the tax year, the child must be under 19; or under 24 and a full-time student for at least five months of the year; or any age if permanently and totally disabled. The disability exception has no age limit, but it requires a doctor's determination that the condition prevents substantial work — see the IRS definition before relying on it.
3. Residency. The child must have lived with you in the United States for more than half of the tax year. Temporary absences — school, medical care, military service, a parent's business travel — generally still count as living with you, as long as the home remained the child's home.
4. Joint return. The child cannot have filed a joint return for the year, except a return filed only to claim a refund of withheld tax.
There is also a Social Security number rule: each qualifying child must have an SSN valid for employment, issued before the return's due date. And the child cannot be the qualifying child of another person who claims them — which brings us to tie-breakers.
Tie-breakers: when two people could claim the same child
Only one taxpayer can claim a child for the EITC. When two people both pass the tests — most often separated parents, or a parent and a grandparent living together — the IRS tie-breaker rules decide. In general: a parent beats a non-parent; if both claimants are parents, the one the child lived with longer wins, and if that is equal, the one with the higher AGI wins; if neither is a parent, the higher-AGI claimant wins.
Parents who share custody should agree in advance who claims the child, and put it in writing if possible. The IRS does not split a child between two returns: if both parents claim the same child, the second return's credit is delayed and one of them will have to repay. This is the single most common EITC audit trigger, and it is almost entirely avoidable with a conversation before filing.
What does not count
A child who is 19 or older and not a full-time student or permanently disabled does not qualify, even if you support them fully. A child who lived with you for exactly half the year or less does not qualify on residency. And a child you support financially but who lives elsewhere — for example, a child living with the other parent — does not qualify for your EITC, whatever child support you pay. Financial support is not one of the four tests; living together is.
Sources to check: IRS Publication 596, Earned Income Credit (2025); IRS, Earned Income Tax Credit: Do I Qualify? (irs.gov).