Both Parents Claimed the Same Child: Who Gets the Credits and What Proves Where the Child Lived

If you and the other parent both claimed the same child on separate returns, the child counts for the parent the child lived with longer during the year; if the time was equal, the parent with the higher adjusted gross income (AGI) wins. That parent, if otherwise eligible, also gets head of household status and the earned income tax credit (EITC); a signed Form 8332 can move only the dependency claim and the child tax credit (or credit for other dependents) to the other parent.

The hard part is proof. In a November 5, 2026, Tax Court decision, a father lost head of household status, the child tax credit and the EITC because he could not back up his account of when his sons stayed with him.

If the IRS sends a CP87A notice

The IRS may first raise the conflict with a CP87A notice, which means another return listed a dependent or qualifying child with the same Social Security number as one on yours. The IRS says it is not auditing you at this time, and it will not tell you who filed the other return.

Compare the last four digits on the notice with the child’s Social Security card. If they do not match, no action is needed beyond using the correct number next year. If they match and you are entitled to the child under the rules below, no response is needed at that stage; if not, the IRS directs you to file Form 1040-X. Either way, gather residence records now; a later examination can require them.

The tiebreaker for two parents

Each parent first has to meet the qualifying-child tests in 26 U.S.C. § 152(c): relationship, age, support, joint return and residence for more than half the year. For the EITC, section 32(c)(3)(A) leaves out the support test. When both parents meet them and file separately, section 152(c)(4)(B) awards the child to the parent the child resided with longest; only an equal split goes to the higher-AGI parent.

The tiebreaker covers a bundle of five benefits: the child tax credit or credit for other dependents, head of household status, the child and dependent care credit, the dependent care benefits exclusion, and the EITC. IRS Publication 501 states that the parents cannot split them by agreement: “you and the other person can’t agree to divide these tax benefits between you.”

A parent who loses the tiebreaker may still qualify for the smaller EITC for workers without a qualifying child under the separate rules in Publication 596.

What Form 8332 can and cannot move

Section 152(e) has a special rule for parents who are divorced, legally separated, separated under a written agreement or living apart for the last six months of the year. If the parents together provided more than half the child’s support and had custody for more than half the year, the custodial parent can sign Form 8332 or a similar written release, which the other parent attaches to his or her return.

That release lets the noncustodial parent claim the child as a dependent and take the child tax credit, additional child tax credit or credit for other dependents. It does not move head of household status or the EITC. Section 2(b) defines head of household using a qualifying child determined “without regard to section 152(e),” and section 32(c)(3)(A) does the same for the EITC. Publication 501 also keeps the child and dependent care credit with the custodial parent.

A divorce decree that took effect after 2008 cannot be attached in place of Form 8332. A revocation under Part III takes effect no earlier than the tax year after the custodial parent gives the other parent a copy or makes a reasonable effort to.

Count the nights the way the IRS does

For section 152(e), the custodial parent is the one the child lived with for the greater number of nights. The regulation, 26 C.F.R. § 1.152-4(d), and Publication 501 explain how to count:

• A night counts for a parent if the child sleeps at that parent’s home, whether or not the parent is there, or with the parent somewhere else, such as on vacation.
• A night away from both parents, such as at a friend’s house or camp, counts for the parent the child would normally have been with, or for neither if that cannot be determined or the child would not have stayed with either parent.
• The night of December 31 belongs to the year in which it begins.
• If a parent’s nighttime work schedule means the child lives with that parent for more days but not more nights, that parent is treated as the custodial parent. On school days, use the primary residence registered with the school.

Those rules define the custodial parent; the tiebreaker itself asks who the child resided with longer. A full-year calendar should track nights and, when the nighttime-work exception applies, days.

Records that show where the child lived

To show that you and the child shared an address for more than half the year, the IRS’s Form 886-H-DEP asks for school, medical, daycare or social service records, or a letter on official letterhead from a school, medical provider, social service agency or place of worship showing names, the shared address and dates. It adds: “We cannot accept documents signed by someone related to you.” Separated parents are also asked for the custody order or decree, any Form 8332 and, if never divorced or legally separated, proof that they lived apart for the last six months of the year.

In Butler v. Commissioner, the father produced neither the custody order nor the log behind his twenty date ranges, and his petition described a different pattern. The court found his testimony alone insufficient.

In our view, the useful file is short and specific: the calendar; for each stretch of the year, a third-party record that ties the child to your address; the custody order; and any Form 8332 or revocation with proof of delivery. Before answering the IRS, check that account against what you have already written in returns, letters or a petition.