For the federal Child Tax Credit (CTC), the child must be under age 17 at the end of the tax year (usually December 31) to qualify as a "qualifying child," though some states have different age rules, and the credit offers up to $2,200 per child for the 2025 tax year, with a refundable portion for lower incomes.
You lose the Child Tax Credit (CTC) at age 17 because federal tax law specifies the credit applies to children under age 17 at the end of the tax year; once a child turns 17, they "age out" of this specific credit, though they might qualify for the smaller Credit for Other Dependents ($500) or remain a standard dependent for other tax benefits. This age cutoff isn't based on student status or living situation (which allow them to remain dependents), but is a strict IRS rule for the CTC.
For the federal Child Tax Credit (CTC), the qualifying child must be under age 17 at the end of the tax year (meaning 16 or younger) and meet other criteria like having a Social Security number, being a U.S. citizen/resident, and living with the taxpayer for more than half the year, with the credit amount typically up to $2,200 per child for 2025, notes the IRS, National Conference of State Legislatures, Center on Budget and Policy Priorities, and Tax Policy Center.
You generally cannot claim the main Child Tax Credit (CTC) for an 18-year-old because they must be under 17, but you may qualify for the Credit for Other Dependents (ODC), which provides a nonrefundable credit of up to $500 for dependents who don't meet CTC rules, including those age 17 and older, like your 18-year-old. For the ODC, the dependent must still meet tests like being your relative, living with you for over half the year (with exceptions), and not providing more than half their own support, and they need a Social Security Number (SSN).
You must have earned income of at least $2,500 to be eligible for the ACTC. You qualify for the full amount of the Child Tax Credit for each qualifying child if you meet all eligibility factors and your annual income is not more than $200,000 ($400,000 if filing a joint return).
A new Child Tax Credit (CTC) law, part of the "One, Big, Beautiful Bill" (OBBBA), makes significant changes starting in 2025, increasing the credit to $2,200 per child (indexed to inflation), adding a citizenship requirement for parents, and making the credit partially refundable (up to $1,700) for low-income families, while permanent changes from the 2017 Tax Cuts and Jobs Act (TCJA) are retained, reverting to pre-22021 rules for full refundability and advance payments.
The underlying purpose of the CTC is to financially support families during their children's growth and development years. Consequently, once the child reaches the age of 17, the aid provided through this credit gradually lessens.
If your child is 18 or over and not in education or training
If your child is no longer enrolled on, or accepted for, eligible education or training, they can apply for Universal Credit themselves.
The American Rescue Plan Act of 2021 temporarily expanded the child tax credit for the 2021 tax year to $3,600 per child under age 6 and $3,000 per child up to age 17.
Yes, you can usually still claim your 17-year-old as a dependent even if they work, as long as they meet the main IRS tests: they lived with you for over half the year, aren't providing more than half their own support, and you are older than them (unless disabled). Their earned income typically doesn't prevent you from claiming the Child Tax Credit (CTC) or them as a dependent, though it can affect their eligibility for the Earned Income Tax Credit (EITC) and might require them to file their own tax return if they earn above a certain amount.
Yes, you can get a tax credit for a college student, but it's usually the Credit for Other Dependents ($500) if they're over 18/23, not the main Child Tax Credit (CTC) for kids under 17, though they can still qualify as a dependent if they meet strict IRS rules (like living with you, getting >50% support, and being a full-time student under 24). The real big education credits are the American Opportunity Tax Credit (AOTC) and Lifetime Learning Credit (LLC), which go to the student (or parent) for educational expenses and can be worth much more.
Increased the credit from up to $2,000 per qualifying child in 2020 to up to $3,600 for each qualifying child under age 6. Increased the credit from up to $2,000 per qualifying child in 2020 to up to $3,000 for each qualifying child ages 6 to 16. Makes 17-year-olds eligible for up to $3,000 in credit.
You lose the Child Tax Credit (CTC) at age 17 because federal tax law specifies the credit applies to children under age 17 at the end of the tax year; once a child turns 17, they "age out" of this specific credit, though they might qualify for the smaller Credit for Other Dependents ($500) or remain a standard dependent for other tax benefits. This age cutoff isn't based on student status or living situation (which allow them to remain dependents), but is a strict IRS rule for the CTC.
Qualifying children can include your son, daughter, stepchild, adopted child or a descendant, foster child, brother, sister, stepbrother, stepsister or a descendant of one of these, provided they are age 18 or younger as of the end of the year (or 23 or young if the child is a full-time student).
To meet the qualifying child test, your child must be younger than you or your spouse if filing jointly and either younger than 19 years old or be a "student" younger than 24 years old as of the end of the calendar year.
For the federal Child Tax Credit (CTC), the qualifying child must be under age 17 at the end of the tax year (meaning 16 or younger) and meet other criteria like having a Social Security number, being a U.S. citizen/resident, and living with the taxpayer for more than half the year, with the credit amount typically up to $2,200 per child for 2025, notes the IRS, National Conference of State Legislatures, Center on Budget and Policy Priorities, and Tax Policy Center.
Financial Support for 18+
Child support usually stops when a child turns 18 or graduates high school, whichever is later, but it can extend to age 19 or 21 in many states if the child is still in high school, has a disability, or attends college, depending on state laws, while other factors like marriage, military enlistment, or emancipation end the obligation sooner.
The criteria for claiming the Additional Child Tax Credit are below: Age limit: The child must be under 17 at the end of the US tax year (December 31). SSN: Both you and the child or dependent must have a Social Security Number issued by the tax filing deadline.
Report any changes to your child's circumstances (e.g. leaving education, starting work, moving out) in your Universal Credit online account. If your child leaves education or training, or turns 20, your support will change, so it's a good idea to try to plan ahead where possible.
Yes, you might be able to claim your 25-year-old son as a dependent if he meets the "qualifying relative" tests (under $5,050 gross income, you provide over half his support, lives with you, etc.) or if he's permanently and totally disabled, but not as a "qualifying child" due to age unless he's a student under 24 and younger than you, which at 25 he likely won't meet. The main path for a 25-year-old is the Qualifying Relative rules, focusing on his income and your financial support.
Your child tax credit is likely $500 instead of $2,000 because they either turned 17 during the tax year, making them eligible for the Other Dependent Credit, or you might have mistakenly checked a box in your tax software, like saying their SSN isn't valid for employment or that they paid over half their own support, which triggers the lower credit amount, according to TurboTax support, TurboTax support, TurboTax support, and TurboTax support https://ttlc.intuit.index.php/community/taxes/discussion/my-daughter-is-17-but-is-still-jr-in-high-school-why-do-i-only-get-500-for-her-and-not-the-full-2000/00/3423950.
The CTC is worth up to $2,200 per child for the 2025 tax year. The refundable portion of the CTC, called the Additional Child Tax Credit (ACTC), is $1,700. The CTC operates as a partially refundable tax credit, not as monthly payments as in some prior years.
YCTC may provide you with cash back or reduce any tax you owe. California families qualify with earned income of $32,900 or less. You also must have a qualifying child under 6 years old at the end of the tax year and qualify for CalEITC – with one exception.