When Is My Child No Longer a Dependent: Age, Income, and Support

Your child is no longer your dependent for federal tax purposes the moment they fail one of the IRS tests for their category. In most families that happens at a predictable age: a child stops being a qualifying child at the end of the year they turn 19, or the end of the year they turn 24 if they were a full-time student for at least five months. It can also happen earlier, if the child starts paying for more than half of their own support, or later, if they still earn under $5,300 (for 2026) and you cover most of their costs, in which case they may shift into the qualifying relative category instead.¹²

The Two Ways a Child Can Still Count

The IRS gives you two separate paths to claim a child. The first is the qualifying child test, which applies to younger children and full-time students and unlocks the Child Tax Credit and the Earned Income Tax Credit. The second is the qualifying relative test, which can pick up an older child who no longer meets the age rules but still leans on you financially. It’s worth a smaller benefit — the $500 Credit for Other Dependents.³

Both paths share baseline rules. The child generally can’t file a joint return with a spouse, unless the joint return is filed only to claim a refund of withheld tax. The child must be a U.S. citizen, U.S. national, or resident of the United States, Canada, or Mexico. And no one can be claimed as a dependent on more than one return.⁴

One trap worth knowing: a qualifying relative cannot be someone who is already the qualifying child of another taxpayer. If your 20-year-old non-student could still be claimed as a qualifying child by their other parent, you generally can’t switch them over to your return as a qualifying relative.⁴

When Age Ends It

Age is where most children fall out. To be your qualifying child, your child must be under 19 at the end of the tax year. If your child is a full-time student, the cutoff stretches to under 24.¹

“Full-time” means enrolled in the course load their school treats as full-time during at least five months of the year. Those five months don’t have to be consecutive. A student who attends a spring semester and a fall semester still qualifies, even though summer sits between them.⁵

There’s an exception that bypasses the age test entirely. A child who is permanently and totally disabled can be your qualifying child at any age, provided a physician has determined that a physical or mental condition prevents substantial work activity and has lasted or is expected to last at least a year, or could lead to death.¹

Keep one thing straight: the Child Tax Credit uses a stricter age cutoff than dependency itself. The credit requires the child to be under 17 at year-end. A 17- or 18-year-old can still be your dependent, but you’ll only get the $500 Credit for Other Dependents rather than the $2,200 Child Tax Credit.³

When Their Income Ends It

Once your child ages out of the qualifying child rules, income becomes the deciding factor. To be your qualifying relative for 2026, your child’s gross income must be less than $5,300.² Gross income here means taxable income: wages, interest, rental receipts. It doesn’t include nontaxable Social Security benefits or tax-exempt welfare payments.⁴

This is the test that quietly ends dependency for a lot of families. A part-time job during college may stay under $5,300, but a first full-time paycheck out of school almost always clears it. At that point, the child can’t be claimed under either category.

When Support Ends It

The support test cuts in different directions depending on the category. For a qualifying child, the child must not have provided more than half of their own support. For a qualifying relative, you must have provided more than half of the person’s total support.¹

Support covers housing, food, clothing, medical care, education, and transportation. When your child lives with you, the housing figure is the fair rental value of the space they occupy plus a share for furniture and appliances, not your actual mortgage. Shared expenses like groceries get divided across the household.¹

Some items are specifically left out of the calculation. Income and payroll taxes your child pays on their own earnings don’t count. Neither do life insurance premiums, funeral expenses, or scholarships received by a student.¹ The scholarship rule is a helpful one. A student on a full academic scholarship isn’t treated as self-supporting just because the scholarship covers tuition.

When They Move Out

A qualifying child has to live with you more than half the tax year. Temporary absences don’t break the streak. Time away at school, in the hospital, on military service, or on vacation still counts as living with you.⁵ A college student who lives on campus most of the year is still your dependent as long as your home is their primary residence.

A child born or who died during the year is treated as living with you the entire year, provided your home was their home for the entire time they were alive.⁵

Once a child moves out permanently and sets up their own household, the residency test breaks. They may still qualify as your qualifying relative if you keep paying more than half of their support and their income stays below the threshold, but the qualifying child path closes.

What You Lose the Year They Age Out

Losing a dependent moves several credits at once. For 2026, the stakes look like this.

Child Tax Credit

The Child Tax Credit is worth up to $2,200 per qualifying child for 2026, with a refundable portion capped at $1,700. The child must be under 17 at year-end, so this credit disappears years before dependency itself ends. It begins phasing out at $200,000 of adjusted gross income, or $400,000 for joint filers.³

Credit for Other Dependents

A dependent who is too old for the Child Tax Credit, or who qualifies only as a qualifying relative, can still bring you the $500 Credit for Other Dependents. It’s nonrefundable, so it can zero out your tax bill but won’t generate a refund on its own. The same $200,000 and $400,000 phase-outs apply.³

Earned Income Tax Credit

The EITC swings hard with the number of qualifying children. For 2025, the maximum ran from $649 with no qualifying children up to $8,046 with three or more.⁶ The 2026 amounts adjust for inflation but keep the same structure. Losing your last qualifying child drops your maximum EITC by thousands of dollars.

Head of Household

Head of household status doesn’t have to disappear the same year your child does. You can keep it in a year you can’t claim your child as a dependent, so long as you’re unmarried, paid more than half the cost of keeping up a home, and that home was your child’s main home for more than half the year.⁷ This is the safety net for the transition year when your child earns their way out of dependency but still lives at home.

Health Insurance Runs on Its Own Clock

Dropping a child from your tax return doesn’t mean dropping them from your health plan. Under the Affordable Care Act, any health plan that offers dependent coverage must let your child stay on your plan until age 26, whether or not they live with you, whether or not you claim them, and whether or not they’re a student.⁸ The tax exclusion for employer-provided health coverage runs through the end of the year the child turns 26, even after you stop claiming them as a dependent.

1
Internal Revenue Service. Dependents
2
Internal Revenue Service. Rev. Proc. 2025-32
3
Internal Revenue Service. Child Tax Credit
4
Internal Revenue Service. Publication 501 (2025), Dependents, Standard Deduction, and Filing Information
5
Internal Revenue Service. Qualifying Child Rules
6
Internal Revenue Service. Earned Income and Earned Income Tax Credit (EITC) Tables
7
Internal Revenue Service. Filing Status
8
CMS.gov. Young Adults and the Affordable Care Act