Divorce and Taxes: Filing Status, Alimony, and Claiming Kids After a Split

Divorce changes nearly every part of a tax return — filing status, dependents, and sometimes years of prior joint-filing history — and several of the rules that governed this for decades were reversed by the Tax Cuts and Jobs Act, so older advice you might have heard from friends or family who divorced before 2019 may no longer apply.

Filing Status Depends on December 31, Not the Whole Year

Your filing status for the entire tax year is determined by your marital status on the last day of the year. If your divorce is finalized on or before December 31, you're considered unmarried for the entire year, even if you were married for the first 11 months of it — you cannot file jointly for that year even if you wanted to. If your divorce isn't finalized until January of the following year, you're still considered married for the prior year and can file jointly or as Married Filing Separately for that final year, even if you were separated for months beforehand.

Alimony: The Rule Flipped in 2019

This is the single biggest change people get wrong, because it depends entirely on when your divorce or separation agreement was executed:

• Agreements executed after December 31, 2018: alimony is not deductible by the person paying it, and not taxable income to the person receiving it — the opposite of the old rule.
• Agreements executed on or before December 31, 2018 (and not later modified to adopt the new rules): the old rule still applies — alimony is deductible by the payer and taxable to the recipient.

This means two people who divorced a few years apart, under otherwise similar circumstances, can have completely opposite tax treatment of the same type of payment. If your agreement is old enough to predate 2019, check whether it's ever been modified — a modification can sometimes trigger the new rules if the modification explicitly says so, but doesn't automatically unless stated.

Who Claims the Kids

The general dependency rules assign a qualifying child to the parent the child lived with for more nights during the year — the "custodial parent," in tax terminology, regardless of what a custody agreement calls the arrangement. That custodial parent generally gets to claim the child for the Child Tax Credit and other child-related tax benefits by default.

The custodial parent can release this claim to the noncustodial parent using Form 8832 — often part of a divorce settlement — but even when they do, certain benefits (like Head of Household filing status and the Earned Income Tax Credit) generally stay with the custodial parent regardless of who claims the dependency-related credits, since those benefits are tied to actually having the child live with you, not to the dependency claim itself.

Head of Household After Divorce

If you're unmarried at year-end, paid more than half the cost of maintaining your home, and had a qualifying child living with you for more than half the year, you may qualify for Head of Household status — meaningfully better brackets and a larger standard deduction than filing Single. This is one of the more valuable tax changes many newly divorced custodial parents are entitled to but don't realize applies to them.

Splitting Property: The Home Sale Exclusion

If the marital home is sold as part of the divorce, each spouse can potentially claim up to $250,000 of the home-sale exclusion individually — up to $500,000 combined, the same as if you'd sold while married filing jointly — as long as each of you separately meets the ownership and use tests. If one spouse moved out well before the sale but retains ownership, special rules can allow that spouse's use test to still be satisfied through the other spouse's continued occupancy, under certain settlement-agreement conditions — this is a case where getting it wrong is expensive, and confirming the details with a tax professional before the sale closes is worth the cost.

Retirement Account Transfers: QDROs

Dividing a 401(k) or pension typically requires a Qualified Domestic Relations Order (QDRO) — without one, a transfer between spouses' retirement accounts as part of divorce can trigger immediate taxation and penalties for the account holder. A properly executed QDRO allows the transfer to happen without triggering tax at the time of the transfer; the receiving spouse is then taxed later when they eventually withdraw the funds, the same as any other retirement distribution.

Update Your Withholding Right Away

A new filing status usually changes your tax brackets and standard deduction, which means your existing W-4 withholding elections from your marriage are almost certainly wrong for your new situation. File an updated Form W-4 with your employer as soon as your filing status changes rather than waiting until the following tax season — going a full year with marriage-era withholding after switching to Single or Head of Household is a common way to end up owing an unexpected balance (or overpaying significantly) the following April.

Common Questions

Do I need to notify the IRS of my divorce? Not directly — but you should update your name with the Social Security Administration if it changed, since a name mismatch between your return and SSA records can delay processing, and update your W-4 withholding with your employer to reflect your new filing status.

Can both parents claim Head of Household? No — only one parent can claim Head of Household for a given child in a given year, generally the custodial parent, even in cases where custody is nearly evenly split; the "more than half the year" test determines it precisely.

What about legal fees from the divorce — are they deductible? Generally no. Personal legal fees related to divorce are not deductible, though fees specifically for obtaining taxable alimony (under a pre-2019 agreement) were deductible in the past — this is a narrow, mostly historical exception.