Sharing custody: who claims the child, and what Form 8332 does not transfer

The custodial parent is the one the child spent more nights with, and that parent is the one who can claim the child. Everything else in shared custody follows from counting nights.

Counting nights, exactly

The custodial parent is the parent with whom the child lived for the greater number of nights during the year; the other parent is the noncustodial parent. The count has its own rules, and they matter more than most people expect.

A night counts for a parent if the child sleeps at that parent's home, even on an evening the parent is not there, or sleeps in that parent's company somewhere else, on vacation for instance. If the nights come out equal, the custodial parent is the one with the higher adjusted gross income. The night of December 31 belongs to the year it begins in. Where a parent works nights and the child is with that parent for more days than nights, that parent is treated as custodial, and a school day is resolved by the residence registered with the school. If the parents separated during the year, the count runs over the part of the year after the separation.

The conditions for a release

A noncustodial parent can claim the child only if a set of conditions in Publication 501 is met, and the one that does the work in practice is a signed written declaration from the custodial parent saying they will not claim the child. That declaration is Form 8332, or a statement substantially similar to it, attached to the noncustodial parent's return. The rest of the conditions concern the parents' living arrangements and support, and Publication 501 sets them out in full.

What a release moves

A signed release moves four things and no more: the claim to the child as a dependent, the child tax credit, the credit for other dependents, and the refundable additional child tax credit. If you want to know what those are worth, the child tax credit has the amounts.

What a release does not move

Head of household filing status stays with the custodial parent. So does the credit for child and dependent care expenses, the exclusion for employer-provided dependent care benefits, and the earned income credit. A release does not touch any of them.

Releasing parents routinely assume otherwise. The IRS gives the point as a worked example: even with a signed Form 8332 in hand, a noncustodial parent cannot claim the child as a qualifying child for the earned income credit. The custodial parent, or another eligible taxpayer, keeps it. Filing status covers what head of household is worth on its own.

Alternating years, and how to do it without a fight

A release can be signed for one year or for several future years, and it can be revoked. In practice, signing one year at a time is the version that causes the fewest arguments: keep a copy, and hand the original over when the return is actually being prepared rather than in December when nothing is settled. If you need to revoke a release you have already signed, the instructions to Form 8332 set out how and when that takes effect.

The decree is not the rule

A family court order that allocates the child between the parents is an agreement between the two of them. The federal return follows the tax rules, and those rules give the claim to the custodial parent unless a release is signed. A noncustodial parent who claims a child without one has a claim the IRS can disallow, whatever the decree says.

Where the two conflict, there are two honest options: get the release signed for the year in question, or go back to the court that made the order. The parents cannot simply agree between themselves to divide the child-related benefits.

If you both claim the child anyway

The IRS applies tie-breaker rules in order. If only one of the two people is the child's parent, the child is the parent's qualifying child. If the parents file a joint return together and both claim, the child is treated as the qualifying child of the parents. If they do not file jointly and both claim, the child goes to the parent the child lived with for the longer period during the year, and if that is equal, to the parent with the higher adjusted gross income. If no parent can claim the child, the child goes to the person with the highest adjusted gross income. What a rejected return looks like covers the procedure once both returns are in.

What to keep

Keep a calendar of the year's nights, the school and medical records showing the child's address, and the signed release. The calendar is the evidence, and nobody reconstructs one accurately two years later.