Pub 504: Filing Status, Claiming Kids, and Spousal Relief

IRS Publication 504 is the federal tax guide for people who are divorced, legally separated, or living apart from a spouse, and it covers the rules that change the most once a marriage ends: filing status, who claims the children, how alimony and child support are taxed, how property and retirement accounts can be split without triggering a tax bill, and how to get out from under a joint return your ex mishandled. The rules in Publication 504 are strict about timing and paperwork, and the first year or two after a separation is when most of the expensive mistakes happen.¹

Your Filing Status Depends on December 31

Your marital status on the last day of the year sets your filing status for the entire year. A divorce finalized on December 31 makes you unmarried for all 12 months. A decree issued on January 2 leaves you married for the year that just ended, even if you had been living apart for most of it. An interlocutory decree or a pending case does not count; without a final decree of divorce or separate maintenance by December 31, you are still married for tax purposes.¹

Four statuses are potentially in play: Single, Married Filing Jointly, Married Filing Separately, and Head of Household. The one you pick can swing your tax by thousands of dollars.

Head of Household and the “Considered Unmarried” Test

Head of Household gives you lower tax rates and a bigger standard deduction than Single or Married Filing Separately. For tax year 2026, the Head of Household standard deduction is $24,150, compared with $16,100 for Single or Married Filing Separately.²

To qualify, you have to meet three tests. You must be unmarried on December 31, or “considered unmarried.” A still-married person is considered unmarried if the spouse did not live in the home during the last six months of the year and the person files a separate return. You must have paid more than half the cost of keeping up your home for the year, which includes rent or mortgage interest, property taxes, insurance, utilities, repairs, and food eaten in the home. And a qualifying person, usually your child, stepchild, or foster child, must have lived in your home for more than half the year. Temporary absences for school or vacation do not break the residency requirement.³

One point parents frequently miss: you must be able to claim the child as a dependent, but you still pass this test even if you released the dependency claim to the other parent on Form 8332.³

What You Give Up by Filing Separately

If you remain legally married and don’t want to file jointly, Married Filing Separately is available, but it closes a lot of doors. You lose the Earned Income Tax Credit if you lived with your spouse at any point during the year. Education credits like the American Opportunity Credit and Lifetime Learning Credit are off the table, and so is the student loan interest deduction. The Child and Dependent Care Credit is usually unavailable, and the dependent care assistance exclusion drops from $5,000 to $2,500.⁴

There is also a forced consistency rule. If one spouse itemizes, the other has to itemize too, even when the standard deduction would be larger.⁵

Who Claims the Kids

Dependency claims drive several of the most valuable tax benefits, and this is where divorced parents fight most often. Get the mechanics wrong and one of you claims a credit you aren’t entitled to while the other loses one you are.

Custodial Parent Rule and Form 8332

By default, the parent who had physical custody for the greater part of the year claims the child. If the child spent more nights at your home, you are the custodial parent for tax purposes.¹

The custodial parent can hand the dependency claim to the other parent by signing Form 8332. The noncustodial parent then attaches that form to the tax return for every year they claim the child. The release can cover one year, several specified years, or all future years, and the custodial parent can revoke a multi-year release by filing Part III of Form 8332. A divorce decree alone does not do this. Even if the court order gives the noncustodial parent the right to claim the child, the IRS requires Form 8332 or a substantially similar written declaration signed by the custodial parent.⁶

What Transfers and What Stays

When Form 8332 is signed, the noncustodial parent gets the Child Tax Credit and the Credit for Other Dependents. For tax year 2025, the CTC is worth up to $2,200 per qualifying child under 17, with up to $1,700 refundable as the Additional Child Tax Credit. The credit begins phasing out at $200,000 of income for single or head of household filers and $400,000 for joint filers.⁶

Several benefits never transfer, no matter what the divorce agreement says. Head of Household status stays with the custodial parent. The Earned Income Tax Credit for a qualifying child stays with the parent who meets the residency test. The Child and Dependent Care Credit also stays with the custodial parent because it is tied to who pays for care while the child lives with them.¹

Medical expenses work a little differently. Either parent can deduct medical expenses they actually pay for a child, even if the other parent claims the child as a dependent. The rule applies when the child was in the custody of one or both parents for more than half the year, received over half of their support from the parents, and the parents are divorced, legally separated, separated under a written agreement, or lived apart for the last six months of the year.⁷

Alimony and Child Support

How alimony is taxed depends on when the divorce or separation agreement was signed. The Tax Cuts and Jobs Act drew a hard line at January 1, 2019.

Agreements Executed After 2018

For a divorce or separation agreement executed after December 31, 2018, alimony is not deductible by the payer and not income to the recipient. The payer sends after-tax dollars; the recipient doesn’t report the payments. The same rule applies to a pre-2019 agreement modified after 2018, but only if the modification specifically states that the new non-deductible treatment applies.⁸

Agreements Executed Before 2019

Agreements signed before January 1, 2019 still follow the old rules. The payer deducts alimony on Schedule 1 of Form 1040, and the recipient includes it in gross income. That continues until both former spouses sign a written modification switching to the newer rules.⁸

For a payment to count as alimony under either regime, it must be in cash (including checks or money orders), paid under a divorce or separation instrument, not designated as something else, and the former spouses cannot be living in the same household when it’s made. The obligation must end at the recipient’s death.¹

Alimony Recapture

For pre-2019 agreements, the recapture rule prevents property settlements from being disguised as deductible alimony. If payments decrease by more than $15,000 during the first three calendar years, the IRS treats the excess as front-loaded property division. The payer adds the recaptured amount back into income, and the recipient gets a corresponding deduction. The calculation compares all three years, so a large first-year payment that drops sharply later can trigger recapture even when the decrease looks gradual.⁸

Child Support Is Always Tax-Neutral

Child support is never deductible by the payer and never income to the recipient, regardless of when the agreement was signed.⁹

Labels in the divorce agreement don’t control. If a payment called “alimony” is reduced when a child turns 21, graduates, or dies, the IRS treats the reduced portion as child support all along. The event tied to the child reveals the payment’s real nature.¹

Property Transfers and the Marital Home

Dividing assets in a divorce does not trigger an immediate tax bill. Under Section 1041 of the Internal Revenue Code, no gain or loss is recognized on property transferred to a spouse or former spouse as part of the divorce. The transfer qualifies for this treatment if it happens within one year of the marriage ending, or if it’s made under a divorce or separation instrument within six years after the marriage ends.¹⁰

The catch is carryover basis. The spouse receiving the property inherits the original owner’s tax basis, not the current fair market value. If your ex bought stock for $10,000 and it’s worth $100,000 when transferred to you, your basis is $10,000. When you sell it, you owe tax on $90,000 of gain. A settlement that balances two assets by current market value can turn out to be badly uneven once built-in tax liabilities are counted.

Selling the House

Each spouse can exclude up to $250,000 of gain from the sale of a principal residence under Section 121. To qualify, you must have owned and used the home as your principal residence for at least two of the five years before the sale. If the home is sold while the couple is still married and filing jointly, the combined exclusion is $500,000, provided at least one spouse meets the ownership test and both meet the use test.¹¹

A common post-divorce problem: one spouse moves out while the other stays, and the house isn’t sold for years. The spouse who left may worry about failing the use test. Section 121 handles this. If the divorce or separation agreement grants the remaining spouse use of the home, the spouse who moved out is treated as if they still use it as their principal residence during that period, keeping the $250,000 exclusion alive for both when the home eventually sells.¹¹

Splitting Retirement Accounts Without a Tax Hit

Pulling money out of a retirement account to hand it to your ex is a taxable distribution to you, usually with a 10% early withdrawal penalty on top. The right transfer mechanism moves the money tax-free. Employer plans and IRAs use different procedures.

Employer Plans Need a QDRO

Splitting a 401(k), pension, or other employer-sponsored plan requires a Qualified Domestic Relations Order. A QDRO is a court order directing the plan administrator to pay a portion of the participant’s benefits to an alternate payee, typically the former spouse. The order must include each party’s name and mailing address, the amount or percentage to be transferred, and the number of payments or time period it covers.¹²

The former spouse who receives funds through a QDRO can roll them directly into their own IRA or eligible retirement plan with no immediate tax. A cash distribution is taxed as ordinary income, just as it would be for the original participant, but the 10% early withdrawal penalty does not apply to distributions made to an alternate payee under a QDRO. The plan administrator must approve the order before any transfer happens, and drafting errors can delay the split by months.¹²

IRAs Use Trustee-to-Trustee Transfers

IRAs do not use QDROs. The transfer has to go directly from one IRA to the other through a trustee-to-trustee transfer, or pursuant to a divorce or separation decree. Done correctly, the transfer is tax-free, and the receiving spouse owns the IRA outright going forward. Withdraw the money from your IRA first and then hand it to your ex, and the IRS treats it as your taxable distribution, even if the divorce agreement required the payment.¹³

Relief From a Joint Return Your Ex Mishandled

A joint return makes both spouses jointly and individually liable for the entire tax, and divorce does not change that. If your former spouse underreported income, claimed phony deductions, or didn’t pay what was owed, the IRS can come after you for the full amount. Three forms of relief exist.

Innocent Spouse Relief

This applies when a joint return has an understatement of tax caused by your former spouse’s errors. You have to show you didn’t know, and had no reason to know, about the understatement when you signed. You generally have to file Form 8857 within two years after the IRS first begins collection efforts against you for the disputed liability.¹⁴

Separation of Liability

If you are now divorced, legally separated, or have not lived with your former spouse for at least 12 months, you can ask the IRS to split the joint liability. The deficiency is allocated between you based on which of you was responsible for each item that caused the underpayment, and you’re only on the hook for your share. The same two-year filing deadline applies.¹⁵

Equitable Relief

Equitable relief is the fallback when you don’t qualify for the first two. It’s the only option that covers underpayments, where the return was correct but the tax wasn’t paid. The IRS weighs factors like your current financial situation, whether you benefited from the unpaid tax, and whether your former spouse abused you or controlled the household finances. There is no two-year deadline. You generally have until the IRS’s 10-year collection statute expires for a balance due, or the normal refund deadline for an overpayment.¹⁴

Injured Spouse Is a Different Problem

Innocent spouse relief and injured spouse relief get confused constantly. Injured spouse relief applies when your share of a joint refund is seized to pay your spouse’s separate debts, such as past-due child support, defaulted student loans, or back taxes from before the marriage. You use Form 8379 to recover your portion of the refund. It has nothing to do with errors on the return.¹⁵

Housekeeping Right After the Split

Submit a new Form W-4 to your employer within 10 days. Your withholding was set up for your married status, and leaving the old W-4 in place will almost certainly leave you underwithheld.¹

If you receive alimony under a pre-2019 agreement, that income is taxable and nothing is withheld from it. Quarterly estimated tax payments may be needed to avoid an underpayment penalty.

If you and your spouse made joint estimated tax payments during a year you later decide to file separately, you can divide those payments any way you both agree. If you can’t agree, each spouse’s share equals the total joint payments multiplied by the ratio of that spouse’s individual tax to both spouses’ combined tax.¹

Divorce attorney fees and court costs are not deductible on your federal return. The pre-2018 deduction for the portion of legal fees attributable to tax advice or obtaining taxable alimony was suspended by the Tax Cuts and Jobs Act, and Publication 504 now states that legal fees related to a divorce are not deductible.¹

1
Internal Revenue Service. Publication 504 (2025), Divorced or Separated Individuals
2
Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
3
Internal Revenue Service. Publication 504 (2025), Divorced or Separated Individuals – Section: Requirements
4
Internal Revenue Service. Filing Status
5
Internal Revenue Service. Itemized Deductions, Standard Deduction
6
Internal Revenue Service. Form 8332 – Release/Revocation of Release of Claim to Exemption for Child by Custodial Parent
7
Internal Revenue Service. Publication 502, Medical and Dental Expenses
8
Internal Revenue Service. Topic No 452, Alimony and Separate Maintenance
9
Internal Revenue Service. Alimony, Child Support, Court Awards, Damages
10
Office of the Law Revision Counsel. 26 USC 1041 – Transfers of Property Between Spouses or Incident to Divorce
11
Office of the Law Revision Counsel. 26 USC 121 – Exclusion of Gain From Sale of Principal Residence
12
Internal Revenue Service. Retirement Topics – QDRO Qualified Domestic Relations Order
13
Internal Revenue Service. Filing Taxes After Divorce or Separation
14
Internal Revenue Service. Instructions for Form 8857
15
Internal Revenue Service. Tax Relief for Spouses