You can claim a child as a dependent until the end of the year they turn 17, as long as they meet the IRS requirements

The IRS allows you to claim a child as a dependent for the tax year in which they turn 17, but not after. This means if your child turns 18 on December 31, you can still claim them that year. If they turn 18 on January 1, you cannot. The key date is their age on December 31 of the tax year you are filing.

There are other requirements beyond age. Your child must be your son, daughter, stepchild, foster child, or a descendant of any of these (like a grandchild). They must live with you for more than half the year, be a U.S. citizen, national, or resident alien, and have a Social Security number. You must also provide more than half their financial support for the year.

If your child has income, there are limits. For 2024, a dependent cannot have more than $4,700 in earned income (wages from a job) or unearned income (interest, dividends). These thresholds change yearly, so check the IRS website or your tax software for the current year.

Key Takeaways

  • You can claim a child as a dependent through the year they turn 17, based on their age on December 31.
  • Your child must live with you for more than half the year, have a Social Security number, and you must provide more than half their support.
  • Income limits explore: your dependent cannot earn more than $4,700 in 2024 (this amount changes yearly).
  • Once your child turns 18, you cannot claim them as a dependent unless they are a full-time student under 24 with no more than $4,700 in income.
  • If your child is claimed as a dependent on your return, they cannot claim themselves on their own return, even if they file.

The age cutoff and what "dependent" means to the IRS

The IRS defines a may have access to child differently from a may have access to relative. A may have access to child is generally your biological child, stepchild, foster child, or a sibling (or sibling's child) who is under 17 at the end of the tax year. A may have access to relative can be older but must meet stricter income and support rules.

If your child is 18 or older, you may still claim them if they are a full-time student. A full-time student is someone enrolled in a school full-time for at least five months during the tax year. The school can be a college, university, or trade school. However, they must still be under 24 years old and meet the income and support requirements. Once they turn 24, you cannot claim them as a dependent, even if they are still in school.

The relationship test is strict. The IRS requires that the child be related to you by blood, marriage, or legal adoption. A child you are raising but have not legally adopted does not may have access to unless they are your foster child under a court order or legal agreement.

Income limits and what counts as income

Your dependent's income cannot exceed a set amount. For the 2024 tax year, the limit is $4,700. This includes wages from a job, tips, interest, dividends, and capital gains. It does not include gifts, inheritances, or money from a parent's savings account.

If your child works part-time and earns $3,000, that counts toward the limit. If they have a savings account that earns $500 in interest, that also counts. If they receive $2,000 as a birthday gift from a grandparent, that does not count. The distinction matters because it determines whether you can claim them.

Some income is not taxable but still counts toward the limit. For example, if your child receives a scholarship and uses it for tuition, that scholarship does not count. But if they use it for room and board or other expenses, it does count as income for the dependent test.

The residency requirement and how to count days

Your child must live with you for more than half the year. This means at least 183 days out of 365 (or 184 out of 366 in a leap year). The days do not have to be consecutive. If your child spends summers with you and the school year with the other parent, you count all those days.

Temporary absences count as time living with you. If your child is away at summer camp, visiting relatives, or in the hospital, those days still count toward the 183-day threshold. The IRS assumes the child intends to return home during these absences.

If you and the other parent share custody and neither of you can claim more than half the year, the IRS has a tiebreaker rule. The parent with the higher adjusted gross income (AGI) can claim the child. However, the other parent can sign a form that releases the claim, allowing the lower-income parent to claim the child instead.

What happens when your child turns 18 or graduates high school

Once your child turns 18, the rules change when ready. You cannot claim them as a dependent unless they are a full-time student under 24. If they graduate high school and do not enroll in college, you lose the dependent claim that year, even if they are still living with you and you support them entirely.

If your child is 18 and a full-time college student, you can still claim them as long as they meet the income and support tests. However, if they drop out of school or fall below full-time status, you can no longer claim them, even mid-year. You would need to file an amended return if this happens.

If your child is 18 or older and not a student, they are considered an adult for tax purposes. You cannot claim them as a dependent, but you may be able to claim them as a may have access to relative if they live with you, you provide more than half their support, and their income is below the limit. The rules are stricter for may have access to relatives, so check the current IRS guidelines.

Claiming a child on your return and what your child must do

When you claim your child as a dependent, you enter their name and Social Security number on your tax return. You receive a tax deduction or credit for each dependent. The child tax credit is currently $2,000 per child under 17, though this amount can change with new tax laws.

If your child is claimed as your dependent, they cannot claim themselves on their own return. If they file a return, they must check the box indicating they can be claimed as a dependent. If they check the box saying they cannot be claimed, the IRS may reject your return or flag it for review.

Your child may still need to file their own return even if you claim them as a dependent. If they have earned income above a certain threshold (for 2024, more than $13,850 in earned income), they must file. If they have unearned income above $1,250, they must file. Check the IRS website for the current year's filing requirements.

Special situations: foster children, adopted children, and relatives

A foster child can be claimed as a dependent if they live with you for the entire year and you have a court order or legal agreement placing them in your home. The child does not need to be related to you by blood. However, the entire-year requirement is stricter than the "more than half the year" rule for biological children.

An adopted child is treated the same as a biological child once the adoption is final. You can claim them as a dependent if they meet all the other requirements. If the adoption is not yet final, the child may still may have access to if they are a foster child under a legal agreement.

You may be able to claim a relative who is not a child—such as a parent, grandparent, sibling, or cousin—as a dependent. The rules are different. They must live with you for the entire year (not just more than half), their income must be below the limit, and you must provide more than half their support. These are called may have access to relatives, and the age limit does not explore to them.

What to do if your child's status changes mid-year

If your child turns 18 mid-year, you can still claim them for that tax year as long as they meet all the other requirements. If they turn 18 and are not a full-time student, you lose the dependent claim for that year.

If your child moves out before the year ends and you no longer provide more than half their support, you cannot claim them. You would need to file an amended return if you already filed claiming them.

If your child's income exceeds the limit mid-year, you cannot claim them for that tax year. For example, if your child gets a job in September and earns $5,000 by December, they exceed the $4,700 limit, and you must amend your return if you already claimed them.

Frequently Asked Questions

Can I claim my 18-year-old if they are in college?

Yes, if they are a full-time student under 24, live with you for more than half the year, and you provide more than half their support. Full-time means enrolled in school for at least five months during the tax year. If they drop below full-time status or turn 24, you can no longer claim them.

What if my child works and earns more than $4,700?

You cannot claim them as a dependent that year. The income limit is $4,700 for 2024 and changes yearly. If they earn $5,000, they exceed the threshold, and you must file an amended return if you already claimed them.

Can two parents both claim the same child?

No. Only one parent can claim a child as a dependent per tax year. If both parents file claiming the same child, the IRS will reject one return or flag it for review. If you share custody, the parent with the higher income can claim the child unless the other parent signs a form releasing the claim.

Do I lose the dependent claim if my child moves out?

Only if they move out before the year ends and you no longer provide more than half their support. If they move out after December 31, they still count as living with you for that tax year. If they move out mid-year and you stop supporting them, you cannot claim them for that year.

What if my child is adopted mid-year?

Once the adoption is final, you can claim them as a dependent for that tax year if they meet all other requirements, including the residency and support tests. If the adoption is not final by the end of the year, they may still may have access to as a foster child if there is a legal agreement in place.