You cannot claim the Child Tax Credit for a 17-year-old. Federal law caps that credit at children who are 16 or younger on December 31 of the tax year. What you can claim instead is the Credit for Other Dependents, worth $500, provided your teen still meets the standard dependency tests. Your 17-year-old also keeps you eligible for other tax benefits that often matter more than the credit itself, including Head of Household filing status and the Earned Income Tax Credit.
Why 17 Is the Cutoff
The Internal Revenue Code defines a “qualifying child” for the Child Tax Credit as a dependent who has not reached age 17 by the end of the tax year.1Office of the Law Revision Counsel. 26 USC 24 – Child Tax Credit A child who turns 17 at any point during the year, even on December 31, is out. A child who turns 17 on January 1 still qualifies for the prior tax year, because they were 16 on December 31.
For the 2025 tax year, the maximum Child Tax Credit is $2,200 per qualifying child under 17, and up to $1,700 of that can come back as a refund through the Additional Child Tax Credit for families who owe little or no federal income tax.2Internal Revenue Service. Child Tax Credit Your 17-year-old is still your dependent for general tax purposes, but the age window for the full credit has closed.
The $500 Credit for Other Dependents
When a dependent ages out of the Child Tax Credit but still passes the qualifying tests, the Credit for Other Dependents takes its place. For a 17-year-old, this is the main federal credit available. It’s worth $500 per qualifying dependent.3Internal Revenue Service. Understanding the Credit for Other Dependents
The important catch: the Credit for Other Dependents is nonrefundable. It can reduce your tax bill to zero, but it will not generate a refund on its own. If you already owe no tax before the credit is applied, the $500 disappears. The Child Tax Credit, by contrast, is partially refundable, which is part of why the drop from $2,200 to $500 hits harder than the dollar difference suggests.
A family with a 15-year-old and a 17-year-old, for example, would claim $2,200 for the younger child and $500 for the older one, for $2,700 total. If both were under 17, that same family would receive $4,400. There is no workaround: the age rule is fixed by statute.
The Dependency Tests Your Teen Must Still Meet
Before either credit applies, your 17-year-old has to qualify as your dependent. The age piece is easy: for general dependency purposes, the child must be under 19 at year’s end, or under 24 if a full-time student.4Internal Revenue Service. Publication 501 (2025), Dependents, Standard Deduction, and Filing Information The other four tests are where families sometimes trip up:
- Relationship. The child must be your son, daughter, stepchild, foster child, sibling, or a descendant of any of these.
- Residency. The child must have lived with you for more than half the year. Time away for school, camp, or medical treatment doesn’t count against this.
- Support. The child cannot have provided more than half of their own financial support during the year. A part-time job is usually fine; full-time earnings can put this test at risk.
- Joint return. The child cannot file a joint return, unless it’s filed only to claim a refund of withheld taxes.
All four must be satisfied. Miss one, and neither credit is available. The support test is the one that catches families with working teenagers most often.
SSN vs. ITIN
The identification number your child holds affects which credit you can claim. The Child Tax Credit requires a Social Security number valid for employment, issued before the return’s due date.2Internal Revenue Service. Child Tax Credit An ITIN doesn’t qualify. The Credit for Other Dependents is more flexible: either an SSN or an ITIN works.3Internal Revenue Service. Understanding the Credit for Other Dependents For a 17-year-old with an ITIN, the $500 credit is still on the table.
Income Phase-Outs
Both credits phase out at the same income levels. You get the full amount if your adjusted gross income is at or below $200,000 filing single or Head of Household, or $400,000 filing jointly.2Internal Revenue Service. Child Tax Credit Above those thresholds, the combined credit drops by $50 for every $1,000 of income over the limit. The phase-out applies to your total credits, not to each credit separately.
Here’s what that looks like for a single parent earning $210,000 with only a 17-year-old dependent. Income exceeds the $200,000 threshold by $10,000. At $50 per $1,000, the reduction is $500, which is exactly the Credit for Other Dependents amount. The credit is wiped out entirely.
A married couple at $400,000 with a 17-year-old and a 15-year-old starts with $2,700 in combined credits. At $410,000, they lose $500, leaving $2,200. It takes considerably more income before the credits vanish for a joint filer.
Other Tax Benefits That Don’t Stop at 17
Head of Household
If you’re unmarried and your 17-year-old lived with you more than half the year, you likely qualify to file as Head of Household rather than Single, provided you paid more than half the cost of keeping up the home.4Internal Revenue Service. Publication 501 (2025), Dependents, Standard Deduction, and Filing Information The larger standard deduction and wider brackets can save hundreds or thousands of dollars compared to Single.
Earned Income Tax Credit
Your 17-year-old still counts as a qualifying child for the EITC, which uses a different age rule: under 19, or under 24 if a full-time student.5Internal Revenue Service. Qualifying Child Rules For lower and moderate-income families, the EITC is fully refundable and can be worth substantially more than the Child Tax Credit. Don’t skip it just because your teen aged out of the CTC.
How to Claim It on Your Return
Both credits run through Schedule 8812, attached to Form 1040.6Internal Revenue Service. Instructions for Schedule 8812 (Form 1040) (2025) On Form 1040 itself, list your dependent’s name, Social Security number or ITIN, and relationship. There’s a checkbox column where you indicate whether the dependent qualifies for the Child Tax Credit or the Credit for Other Dependents.7Internal Revenue Service. Form 1040
For your 17-year-old, check the “Credit for other dependents” box. Schedule 8812 handles the credit math, including the income phase-out.8Internal Revenue Service. 2025 Schedule 8812 (Form 1040) Verify that the identification number you enter matches the card exactly; mismatched numbers are among the most common reasons the IRS delays or rejects credit claims.