Shared custody and special cases
Most CTC problems do not come from the amounts — they come from family situations the basic guides do not cover: separated parents, a child who moved mid-year, a baby born in December, an adoption finalized late, or a child who died. The IRS has a rule for each of these, and this guide collects them.
- Only one person can claim a child for the CTC; Form 8332 is the release that lets a noncustodial parent claim.
- A divorce agreement alone does not transfer the CTC — the IRS follows its own tie-breaker unless Form 8332 is signed.
- Temporary absences (school, hospital, military service) still count as living with you.
- A child born or adopted during the year can count for the whole year, with conditions.

Divorce, separation, and Form 8332
When parents are divorced, separated, or never married and living apart, the custodial parent — the parent the child lived with for the greater part of the year — is generally the one who can claim the child. The custodial parent can release the claim to the noncustodial parent by signing Form 8332, Release/Revocation of Release of Claim to Exemption for Child by Custodial Parent, and the noncustodial parent attaches it to their return. Without Form 8332, a divorce decree or custody agreement saying the noncustodial parent "gets the tax benefits" does not transfer the CTC under IRS rules — the IRS follows its own tests, and a state court order is not a substitute for the federal form.
Note the limits of a release: Form 8332 transfers the dependency exemption and the CTC/ODC, but it does not transfer head of household status, the Earned Income Tax Credit, or the child and dependent care credit, which follow their own residency rules. A release can also be revoked, and a revocation takes effect for later years once the IRS is notified on the form. If you are the custodial parent, think carefully before signing a multi-year release.

Temporary absences, moves, and the residency test
The residency test counts time away for school, medical care, business, vacation, and military service as time living with you, provided the child returns or is expected to return. A child who spent the school year in a dormitory still lived with you for tax purposes. What breaks residency is a genuine move: a child who lived with the other parent for more than half the year, or who moved out permanently mid-year, fails the test for the parent they left. Keep school enrollment records, medical records, or a custody calendar — they are the evidence the IRS accepts if residency is questioned.
Birth, death, and adoption years
Born during the year: a child born during the tax year is treated as living with you for the entire year if your home was the child's home, and can be a qualifying child for the full $2,200 (subject to the other tests, including the SSN rule — apply for the SSN promptly, since it must be issued by the return's due date including extensions).
Died during the year: a child who died during the year can still be a qualifying child if the child lived with you for more than half of the part of the year before death, and the other tests are met.
Adopted during the year: an adopted child counts as your child, including a child lawfully placed with you for adoption during the year. A child placed for adoption who lived with you for more than half the year before placement follows the same residency logic. Adoption also has its own separate tax credit — see CTC and other benefits — which is claimed on a different form and does not reduce the CTC.

Sources to check: IRS Form 8332 and instructions; IRS Publication 501; IRS, Child Tax Credit (irs.gov).