The decisive date
How does the December 31 rule determine your filing status?
The IRS looks at one date only: December 31 of the tax year. If your divorce decree or decree of separate maintenance is signed by a court on or before that date, you are unmarried for the entire tax year. If the decree is signed on January 1 or later, you are married for the entire prior year regardless of when you separated or stopped living together.
This creates two practical scenarios:
- Divorce final by Dec 31: File as Single, or as Head of Household if you have a qualifying dependent and paid more than half your household costs. You cannot file MFJ. See Head of Household qualification for the detailed tests.
- Divorce not final by Dec 31: File as MFJ, MFS, or (if you meet the considered-unmarried test) HOH. Filing MFJ with a soon-to-be ex-spouse requires both parties to agree and sign the return.
How did the TCJA change alimony taxation?
The Tax Cuts and Jobs Act of 2017 overhauled alimony tax treatment for agreements executed after December 31, 2018:
| Agreement date | Payer | Recipient |
|---|---|---|
| Before Jan 1, 2019 | Deducts alimony (above the line) | Reports as taxable income |
| After Dec 31, 2018 | No deduction | Not taxable income |
If a pre-2019 agreement is modified after 2018 and the modification explicitly states that the new TCJA rules apply, then the new treatment takes effect. Otherwise, pre-2019 agreements retain the old rules indefinitely. Child support has never been deductible or taxable under either rule set.
Who claims the children after divorce?
The custodial parent -- the parent with whom the child lived for the greater number of nights -- has the default right to claim the child as a dependent. This affects the Child Tax Credit, the dependency deduction (if applicable), and eligibility for Head of Household status.
The custodial parent can release the dependency claim to the noncustodial parent by signing Form 8332 (Release/Revocation of Release of Claim to Exemption for Child by Custodial Parent). The noncustodial parent then claims the child on their return and receives the Child Tax Credit. However, Form 8332 does not transfer the right to file as Head of Household or to claim the Earned Income Tax Credit. Those benefits stay with the custodial parent regardless.
How does a QDRO split retirement accounts?
A Qualified Domestic Relations Order (QDRO) is a court order that directs a retirement plan to pay a portion of one spouse's account to the other spouse (the "alternate payee"). The transfer under a QDRO is not a taxable event and does not trigger the 10 percent early withdrawal penalty. The alternate payee has three options:
- Roll into an IRA: No immediate tax, growth continues tax-deferred.
- Roll into their own employer plan: Same as above, if the plan accepts rollovers.
- Take a cash distribution: Taxed as ordinary income to the recipient. The 10 percent early withdrawal penalty does not apply to QDRO distributions from an employer plan (but does apply if the funds were first rolled to an IRA and then withdrawn before age 59 and a half).
IRA splits during divorce are handled differently: a court-ordered transfer from one spouse's IRA to the other's IRA under a divorce decree is tax-free under IRC Section 408(d)(6), but it must be done as a trustee-to-trustee transfer to avoid triggering a taxable event.
How should you update your W-4 after divorce?
Submit a new W-4 to your employer as soon as the divorce is finalized. Change Step 1(c) to "Single" or "Head of household" depending on your new status. If you were using MFJ withholding tables, switching to Single will increase withholding per paycheck. If you qualify for HOH, selecting it provides slightly lower withholding than Single because of the wider brackets.
Also review Steps 3 and 4: remove any credits or adjustments that were based on the former household situation. If you now have sole custody and qualify for the Child Tax Credit, add those amounts in Step 3. For more on W-4 mechanics, see filing status take-home pay.
What about student loan repayment after divorce?
If you were filing MFJ during marriage and your IDR loan payment was based on combined AGI, your payment will change after divorce when you file as Single or HOH. Your individual AGI may be lower, reducing the IDR payment. Conversely, if your ex-spouse's income was lower than yours, the individual AGI might increase your payment. Notify your loan servicer of the filing status change. For a deeper analysis, see student loan repayment and filing status.
What are the biggest mid-year divorce tax mistakes?
- Filing MFJ after the decree is final: Once the divorce is complete, you cannot file jointly. If you do, the IRS will reject or reclassify the return.
- Both parents claiming the same child: Only one parent can claim each child. If both claim the same child, the IRS applies tiebreaker rules (residency, then AGI). This delays both returns.
- Assuming alimony is deductible: For post-2018 agreements, it is not. Claiming a deduction on alimony you paid under a new agreement will trigger a notice.
- Taking a retirement distribution instead of a QDRO transfer: Cashing out a retirement account without a QDRO triggers tax plus the 10 percent penalty if under 59 and a half.
- Forgetting to update withholding: Continuing with MFJ withholding tables after a divorce means less tax is withheld per paycheck, leading to a balance due at filing.
For an overview of all five filing statuses and which might apply to you, visit the filing status decision guide. Surviving spouses who lost a spouse (rather than divorcing) may qualify for a different status -- see qualifying surviving spouse.
Questions
Divorce Tax Filing FAQ
What filing status do I use the year I get divorced?
Your filing status is determined by your marital status on December 31 of the tax year. If your divorce is finalized by December 31, you file as Single or, if you qualify, as Head of Household. If the divorce is not finalized by December 31, you are still considered married and must file as Married Filing Jointly or Married Filing Separately. The date the divorce petition was filed or the date you separated does not matter; only the final decree date counts.
Is alimony taxable after a 2019 divorce?
No. Under the Tax Cuts and Jobs Act, alimony paid under divorce or separation agreements executed after December 31, 2018 is not deductible by the payer and not taxable to the recipient. For agreements executed before January 1, 2019, the old rules still apply: the payer deducts alimony and the recipient reports it as income, unless the agreement was later modified to specifically adopt the new rules.
Who claims the children as dependents after divorce?
The custodial parent, meaning the parent with whom the child lived for the greater number of nights during the year, has the default right to claim the child as a dependent. The custodial parent can release this claim to the noncustodial parent by signing Form 8332. However, releasing the dependency does not transfer Head of Household eligibility or the Earned Income Tax Credit; those remain with the custodial parent.
Can I file Head of Household the year I divorce?
Yes, if your divorce is finalized by December 31 and you meet the HOH requirements: you paid more than half the cost of keeping up your home, and a qualifying child lived with you for more than half the year. If you were separated but not yet divorced, you may still qualify as considered unmarried for HOH purposes if you lived apart for the last six months of the year.
How does a QDRO affect taxes during divorce?
A Qualified Domestic Relations Order (QDRO) splits retirement account assets between spouses without triggering the 10 percent early withdrawal penalty. The transfer itself is not a taxable event. However, if the receiving spouse later takes a distribution from the transferred amount, that distribution is taxed as ordinary income to the recipient. Rolling the QDRO distribution into an IRA avoids immediate taxation.
- Sources: IRS Publication 504 · IRS Publication 501 · IRC Section 71 (pre-TCJA) · IRC Section 414(p) (QDRO) · TCJA Section 11051.
- Last updated July 31, 2026
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