Who Claims the Child on Taxes When the Parents Aren't Married?

"Not married" is actually two different tax situations

Most articles on this answer one version of the question and quietly ignore the other, which is how readers end up filing wrong. "Unmarried parents" is not one scenario to the IRS. It is two, and they run on separate sections of the tax code. The split is simple: do you and the other parent live in the same home?

If you live together, your situation is governed by the qualifying-child tiebreaker in IRC 152(c)(4). Form 8332, the form everyone mentions, does not apply to you at all. If you live apart, you fall under the special rule for separated parents in IRC 152(e), and Form 8332 becomes the tool that moves the child from one return to the other. Mix those two up and you either claim a child you can't, or hand away a credit you didn't have to. Pick your branch first. Everything else follows from it.

If you live together: the cohabiting-parent rule

You are an unmarried couple, you share a home, and the child lives there with both of you. Good news: this is the flexible branch. If the child is the qualifying child of both of you (lived with you more than half the year, didn't pay for more than half their own support, meets the age tests), then either parent may claim the child, as long as the other one doesn't. You can simply decide between yourselves. No form, no court order, no signature exchanged. One of you puts the child on a return, the other leaves the child off.

The IRS tiebreaker only fires when you both actually claim the same child. At that point the agreement is off and the statute decides. Here is the part competitors get fuzzy about. The first test is nights: the child goes to the parent the child lived with for the greater number of nights. But you live in the same home, so the child slept under the same roof as both of you every single night. That is an automatic tie. Which means the nights test is a wash for you, and the second test always decides: the child becomes the qualifying child of the parent with the higher adjusted gross income (AGI) (IRC 152(c)(4)(B)).

There is a strategy buried in that. Because either of you may claim by agreement, the smart move is usually to let whichever parent gets the larger benefit take the child, then settle up privately if you want. The EITC, for example, phases out at different incomes, so the lower earner sometimes pulls a far bigger refund from the same child. You are allowed to choose that. The AGI rule is only a backstop for when the two of you disagree.

If you live apart: the custodial-parent rule

Now the other branch. You were a couple, you have a child together, and you no longer share a home. This is the world of IRC 152(e), and it works nothing like the first branch. Here the child belongs, by default, to the custodial parent, and the IRS has a very specific definition of that word. The custodial parent is not whoever has legal custody on paper, and not whoever pays more support. It is the parent the child slept with for the greater number of nights during the year. Nights. That's the whole test.

The custodial parent can hand the dependent over to the other parent, but only by signing Form 8332, Release/Revocation of Release of Claim to Exemption for Child by Custodial Parent. This is the form that does not exist for cohabiting parents. To even be in this branch, the rule requires that the parents are divorced, legally separated, separated under a written agreement, or lived apart at all times during the last six months of the year, and that the child got more than half their support from the parents combined. If you only moved out in November, you don't qualify for this rule yet for that tax year.

So a custodial parent who signs Form 8332 keeps a lot. They still file as Head of Household, still claim the EITC, still claim the daycare credit. They give up the dependent line and the $2,200 Child Tax Credit, nothing more. A lot of parents sign that form thinking they're handing over everything, and they're not. Read that benefit split before you sign anything.

You cannot split one child between two returns

This is the rule that gets the most people in trouble, and almost no competing page says it out loud. The tax benefits for a single child cannot be divided between two parents in the same year. One parent takes the entire bundle: the dependent, the Child Tax Credit, the Earned Income Tax Credit, Head of Household filing status, and the Child and Dependent Care Credit. You don't get to say "you take the Child Tax Credit and I'll take the EITC" for the same kid. The IRS is explicit that only one person can claim the child for all of these benefits (IRS EITC Qualifying Child Rules; Pub 596).

The one and only exception is the Form 8332 release described above, and even that is a partial move, not a split. It shifts the dependent and the Child Tax Credit to the noncustodial parent while the residence-based credits stay put. That's the closest the law gets to dividing a child, and it only exists in the live-apart branch.

If you have two children, that's different. Two unmarried parents living together can each claim one child, and each may then qualify for their own set of credits. But for any single child, it's all or nothing, one parent only.

Decision table: who claims the child

Run your situation down the table. Find your row, read across.

What's actually at stake in 2026 (and why the old framing is wrong)

You'll still find pages titled "who claims the child deduction" or "who gets the exemption." Ignore them. The personal and dependency exemption was knocked down to $0 in 2018 by the Tax Cuts and Jobs Act, and the One Big Beautiful Bill Act, signed July 4, 2025, made that permanent. The IRS confirms it plainly for 2026: personal exemptions remain at $0 and are not indexed for inflation. There is no deduction to fight over anymore. What you're really competing for is credits and filing status. So here are the numbers that actually matter for a child claimed on a 2025 or 2026 return:

The Child Tax Credit is $2,200 per qualifying child for both 2025 and 2026, raised from $2,000 by the OBBBA, and indexed for inflation starting in 2026. The IRS sets the 2026 figure in Revenue Procedure 2025-32: "the maximum amount of the credit allowed under section 24(a) is $2,200," and the first indexed year rounds back to that same $2,200. The refundable piece, the Additional Child Tax Credit, is worth up to $1,700 per child for 2026 if your tax bill is too low to use the full credit (IRS, Child Tax Credit). On top of that sits the Earned Income Tax Credit, which can run into the thousands, plus Head of Household and the dependent-care credit. That's the real prize, and it all goes to one parent per child.

What happens if you both claim the child anyway

Say you and the other parent each put the child on a return, either by mistake or because neither of you would back down. Here's the mechanics. The first return to reach the IRS with that child's Social Security number gets accepted. The second one normally gets rejected on e-file for a duplicate dependent SSN. The IRS computer doesn't judge who was right. It just blocks the second filer.

The parent who was actually entitled to the child then has to paper-file their return, mailing it in with the child claimed. That triggers an IRS letter to both parents asking each to prove they were the rightful claimant. You answer with residency records, the nights log, school or medical records showing the child's address. The IRS applies the tiebreaker, awards the child to the correct parent, and bills the other for the credits they wrongly took, plus interest. There is also a newer path: starting with the 2025 filing season, if the second filer has a valid Identity Protection PIN (IP PIN), the IRS will accept that second return on e-file instead of rejecting it for the duplicate dependent. But the clean fix is still to sort out who claims before either of you files.

Head of Household when you both live in the home

Head of Household is a better filing status than Single, with a bigger standard deduction and friendlier brackets, so cohabiting parents often both want it. Usually only one of you can have it. To file as Head of Household you must have paid more than half the cost of keeping up the home and have a qualifying child living with you. Two people sharing one home generally can't both clear the "more than half" bar for the same household, because the costs only add up to 100% once. One of you paid more than half, or neither did.

The realistic outcome: the parent who paid most of the rent, utilities, and groceries, and who claims a qualifying child, files Head of Household. The other partner files Single. The narrow exception is two genuinely separate households, where each parent independently paid more than half the cost of their own household and each has their own qualifying child living with them. That is a real exception in the law, but it is hard to prove when you are one couple sharing one roof and one set of bills. Don't both check Head of Household and hope. That's an audit flag.

Common questions

Short answers to the questions people actually search. The full reasoning is in the sections above.