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For the 2025 tax year, a qualifying child for the federal Child Tax Credit (CTC) must satisfy every applicable test for relationship, age, residence, support, dependency, filing status, citizenship or residency, and Social Security numbers. The child generally must be under 17 on December 31, have lived with you for more than half of 2025, and not have paid more than half of their own support.
Meeting the general dependency definition is not enough by itself. The CTC has its own age and Social Security number requirements, and qualifying-child status does not guarantee the maximum credit or any refundable credit.
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The 2025 qualifying-child tests
The Internal Revenue Service applies a series of tests. In general, the same child must pass all of them for you to claim the CTC on a 2025 federal return.
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|---|---|
| Relationship | The child is your son, daughter, stepchild, eligible foster child, brother, sister, stepbrother, stepsister, half-brother, half-sister, or a descendant of one of those relatives, such as a grandchild, niece, or nephew. |
| Age | The child is under age 17 at the end of 2025. A child who turns 17 on or before December 31, 2025, does not meet the CTC age test. |
| Residence | The child lived with you for more than half of 2025, subject to statutory exceptions. |
| Support | The child did not provide more than half of their own support during 2025. |
| Dependency | You claim the child as a dependent on your federal return. |
| Joint return | The child did not file a joint return for 2025, unless the joint return was filed only to claim a refund of tax withheld or estimated tax. |
| Status | The child is a U.S. citizen, U.S. national, or U.S. resident alien. |
| Social Security numbers | For the CTC or Additional Child Tax Credit (ACTC), the child and taxpayer(s) meet the valid-SSN rules in the 2025 Schedule 8812 instructions. |
Relationship: who can be your qualifying child
The relationship test is broader than “your biological child.” It includes an adopted child, stepchild, eligible foster child, sibling and certain half- or step-siblings. It also reaches descendants of those people. A grandchild, niece or nephew can therefore meet the relationship test when the other requirements are satisfied.
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Age: the CTC cutoff is under 17
For the 2025 CTC, the child must be under 17 at the end of the tax year. Turning 17 on December 31 is too late: the child is not under 17 on the year’s final day.
This is different from the broader qualifying-child rules used for dependency. Those rules can include a full-time student under 24 or a permanently and totally disabled person of any age. Those categories do not override the CTC’s under-17 requirement. An older dependent may qualify for another tax benefit, but not the CTC merely because they remain your dependent.
Residence: more than half the year
The ordinary rule is that the child lived with you for more than half of 2025. Count the child’s living arrangement under the federal residency rules rather than relying only on a custody order, school address or who paid household expenses.
Temporary absences can still count as time living with you when the absence is treated as temporary under the tax rules. Publication 501 also addresses special situations involving a child’s birth or death, adoption or foster placement, and parents who are divorced or separated.
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Support: the child must not support themself more than half
The support test asks whether the child provided more than half of their own support for the year. It does not ask whether you paid more than the other parent, and a child’s earnings are not automatically a disqualifier. A teenager can have wages and still meet the test if those wages did not provide more than half of the child’s total support.
Dependency and the child’s own return
You must claim the child as a dependent on your return. The child generally cannot file a joint return and still be your qualifying child, except when the joint return is filed only to obtain a refund of income tax withheld or estimated payments. A joint return filed for another reason can prevent CTC qualification.
Citizenship, nationality or residence
The child must be a U.S. citizen, U.S. national or U.S. resident alien for the applicable tax year. Immigration and tax-residency facts can be technical; do not assume that a particular visa, passport or period in the United States resolves the test without checking the IRS rules.
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For the 2025 CTC and ACTC, the child must have a Social Security number (SSN) that is valid for employment, and the number must be issued by the due date of the return, including extensions. The taxpayer rules also matter. On a joint return, one spouse must have a qualifying SSN and the other spouse must have either an SSN or an Individual Taxpayer Identification Number (ITIN) issued by the applicable due date.
An ITIN for the child does not replace the CTC child-SSN requirement. A child who has another taxpayer identification number may potentially be considered for the Credit for Other Dependents (ODC), subject to that credit’s separate rules, but that is not the CTC.
Special exception for a child born and deceased in 2025
The 2025 Schedule 8812 instructions describe an exception when a child was born and died during 2025 without an SSN. The return must include the documentation specified by the IRS. Do not simply enter an ITIN or leave the SSN field blank without following those instructions.
Birth, death, adoption and foster-placement exceptions
Residency is measured over the tax year, but the law recognizes that a child cannot live in a home before birth or before placement. Publication 501 contains exceptions for a child born or dying during the year and for adoption or foster placement.
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For a child born alive and dying during 2025, the IRS says the child may be treated as living with you for more than half of the year when your home was, or would have been, the child’s main home for more than half of the time the child was alive. The documentation requirements are different when the child never received an SSN, so follow the current Schedule 8812 instructions and retain the required records.
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When parents or other taxpayers both appear eligible
More than one person may seem to meet the basic tests, but the same child generally cannot be used by multiple taxpayers for the specified child-related benefits. The IRS tie-breaker rules determine who may claim the child when claims conflict.
Compare the facts that actually control
- Whether each claimant is the child’s parent or another person who meets the relationship rule.
- The number of nights the child lived with each taxpayer during 2025.
- Whether a special rule for divorced or separated parents applies.
- Whether the child met the relationship, age, support, dependency, joint-return and status tests.
- Whether the child and taxpayer(s) met the SSN requirements.
- The applicable tie-breaker, including parent priority or adjusted gross income (AGI) where the IRS rules call for it.
Do not reduce the analysis to who paid more child support. The child’s support test concerns whether the child supplied more than half of their own support; it is not a contest over which parent paid the larger share of expenses.
Divorced or separated parents
Special rules can allow a noncustodial parent to claim a child as a dependent and claim the CTC, ACTC or ODC when the required release and other conditions are met. Other benefits have different rules. A custody schedule or informal agreement alone does not transfer every tax benefit.
The parent claiming under the special separated-parent rules must have the documentation and release required by the IRS. If both parents claim the same child, the IRS may reject one return or later adjust the tax. Resolve the facts using the current Publication 501 and Form 8332-related requirements, and seek professional help when the parents disagree about nights, releases or eligibility.
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Qualifying-child status does not guarantee the maximum credit
For tax year 2025, IRS materials state a maximum CTC of $2,200 per qualifying child. The maximum ACTC is $1,700 per qualifying child. The ACTC is the refundable portion available when its additional requirements are met; qualifying-child status alone does not create the refund.
| 2025 item | IRS-published amount or condition |
|---|---|
| Maximum Child Tax Credit | $2,200 per qualifying child |
| Maximum Additional Child Tax Credit | $1,700 per qualifying child |
| Income level for the full CTC amount | $200,000, or $400,000 for married taxpayers filing jointly |
| Higher-income treatment | Taxpayers above the stated thresholds may receive a partial credit |
| Earned-income condition cited for ACTC eligibility | At least $2,500 of earned income |
These are 2025 tax-year figures, not permanent amounts. The applicable filing status, income calculation and other Schedule 8812 rules determine the credit actually allowed. A taxpayer can satisfy every qualifying-child test and still receive less than $2,200, or no refundable ACTC.
How to claim the credit on a 2025 return
- List the child on Form 1040. Enter the child and other dependents in the dependents section of your federal return.
- Confirm the CTC tests. Check the relationship, under-17 age, residence, support, dependency, joint-return and citizenship or residency requirements.
- Verify SSNs and due dates. Confirm that the child’s employment-valid SSN and the taxpayer SSNs or ITINs meet the 2025 due-date rules, including any extension.
- Complete Schedule 8812. Use Schedule 8812 and its 2025 instructions to calculate the CTC, ODC and ACTC and to apply income, earned-income and refundable-credit limits.
- Keep supporting records. Retain records of the child’s address and time in your home, school or medical documents, birth or placement records, support information, and any release or documentation required for a separated-parent claim.
The IRS Interactive Tax Assistant includes an eligibility question asking whether a child or dependent qualifies for the CTC or ODC. Use the tool and the instructions for the exact tax year rather than an older calculator.
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Common mistakes that change the result
- Using the general dependency age rule: A student under 24 or a permanently disabled person of any age may be a qualifying child for dependency purposes, but the CTC generally requires being under 17 at year-end.
- Assuming an ITIN is enough: The child’s ITIN does not satisfy the CTC child-SSN rule.
- Counting only physical custody paperwork: Tax residency and separated-parent rules may require more than an informal agreement or a calendar label.
- Comparing parent payments: The support test asks about the child’s own support, not which adult spent more.
- Ignoring a joint return: A child’s joint return can disqualify the child unless it was filed solely to claim a refund of withholding or estimated tax.
- Assuming qualification equals $2,200: Income thresholds, filing status and refundable-credit rules affect the amount.
- Using the wrong year’s instructions: Dollar limits, SSN timing and forms can change. Use 2025 forms and instructions for a 2025 return.
What to do when the facts are disputed or unusual
Federal rules do not resolve every custody dispute from a short eligibility checklist. If parents claim the same child, a child moved between homes, a placement occurred late in the year, or the child was born and died in 2025, gather the relevant dates and documents before filing. Apply the tie-breaker and special-parent rules in the current IRS publications and Schedule 8812 instructions.
This is federal guidance for tax year 2025, not a determination of an individual return and not state-tax advice. When claimants disagree or the residency facts are complicated, a qualified tax professional can help determine which taxpayer may claim which benefit.
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