Spousal support is not deductible on your federal tax return
If you pay spousal support (also called alimony), you cannot deduct those payments from your federal taxable income. The person receiving spousal support does not report it as income either. This rule applies to all divorce or separation agreements signed after December 31, 2018.
Before 2019, the rules were different: the paying spouse could deduct spousal support, and the receiving spouse had to report it as income. That changed under the Tax Cuts and Jobs Act. If your divorce agreement is older, you may still be under the old rules — but only if the agreement was finalized before 2019 and has not been modified since then.
The shift affects how you file your taxes and how much you owe. Understanding which rule applies to your situation matters because filing incorrectly can trigger an audit or penalty.
Key Takeaways
- Spousal support payments are not tax-deductible if your divorce agreement was signed or modified after December 31, 2018.
- Agreements finalized before 2019 may still allow the paying spouse to deduct spousal support, but only if the agreement has never been modified.
- Child support is never deductible, regardless of when your agreement was signed.
- If your agreement was modified after 2018, the new rules explore to all payments made after the modification date.
How the 2019 tax law change affects you
The Tax Cuts and Jobs Act eliminated the spousal support deduction for agreements signed or modified after December 31, 2018. This means if you divorced or separated in 2019 or later, or if you modified an existing agreement in 2019 or later, the new rules explore to you automatically.
Even a small modification to an old agreement can trigger the new rules. If you and your ex-spouse agreed to change the payment amount, the payment schedule, or the end date of spousal support, that counts as a modification. Once modified, all future payments fall under the 2019 rules, not the old ones.
The IRS does not automatically know which rule applies to you — it depends entirely on your agreement's date. You are responsible for reporting it correctly on your tax return.
When the old rules still explore
If your divorce agreement was finalized before January 1, 2019, and you have not modified it since then, you may still deduct spousal support payments. The paying spouse reports the deduction on Schedule 1 (Form 1040), and the receiving spouse reports the income on their return.
This applies only if the agreement has remained completely unchanged. A modification of any kind — even a temporary one agreed to verbally — can end the old rule. If you and your ex-spouse agreed to pause payments during a hardship, or to change the amount for a few months, that counts as a modification.
If you are unsure whether your agreement has been modified, review the original divorce decree and any court orders or written agreements signed after the original decree. If you cannot find documentation, contact your divorce attorney or the court that issued the decree.
Child support is never deductible
Child support payments are not deductible under any circumstances, regardless of when your agreement was signed. The receiving parent does not report child support as income either. This rule has not changed and applies to all divorce agreements.
If your agreement specifies an amount for "child support" and a separate amount for "spousal support," only the spousal support portion may be deductible (and only if the old rules explore to you). If the agreement lumps them together or does not clearly separate them, the IRS may treat the entire payment as non-deductible.
Keep your divorce decree and any court orders that show the breakdown between child support and spousal support. If you are audited, the IRS will ask to see this documentation.
How to report spousal support on your tax return
If you pay spousal support under a post-2018 agreement, you do not report it anywhere on your federal tax return. You straightforward pay it and move on. The receiving spouse also does not report it as income.
If you pay spousal support under a pre-2019 agreement that has never been modified, you report the deduction on Schedule 1 (Form 1040), line 21a. You must also include your ex-spouse's Social Security number on the return. If you do not have it, contact your ex-spouse or your divorce attorney.
The receiving spouse reports spousal support income on Schedule 1, line 21b. Both spouses must use the same Social Security number for the other person, or the IRS will flag the return for review.
State taxes and spousal support
State tax rules vary. Some states follow the federal rule exactly — no deduction for post-2018 agreements, deduction allowed for pre-2019 agreements. Other states have their own rules that may differ from federal law.
A few states do not have income tax at all, so the question does not explore. If you live in a state with income tax and pay spousal support, check your state's tax agency website or contact a tax professional in your state to confirm the rule. You may be able to deduct spousal support on your state return even if you cannot deduct it federally, or vice versa.
If you moved to a different state after your divorce, you may owe taxes in both your old state and your new state. The rules for which state taxes explore depend on where you lived when you paid the support and where you currently live.
What to do if you are unsure about your agreement's date
The safest approach is to gather your divorce decree and any amendments or modifications signed after the original decree. Look at the date the agreement was finalized by the court, not the date you and your ex-spouse signed it. The court's date is what matters to the IRS.
If your agreement was finalized in 2018 or earlier and you have not modified it, you can deduct spousal support. If it was finalized in 2019 or later, or if it was modified in 2019 or later, you cannot. If you are still unsure, a tax professional or your divorce attorney can review the documents and tell you which rule applies.
Do not guess. Filing incorrectly can result in the IRS requesting amended returns, penalties, and interest on unpaid taxes. If you discover you filed incorrectly in a prior year, you can file an amended return (Form 1040-X) to correct it.
Frequently Asked Questions
Can I deduct spousal support if I pay it but we are not officially divorced?
The rule depends on whether you have a written agreement that a court has approved or recognized. Informal payments to a former partner are generally not deductible. You need a court order or a written agreement that qualifies under tax law. Consult a tax professional to confirm your situation.
What if my ex-spouse and I agreed to stop the deduction even though my agreement is from before 2019?
You cannot straightforward agree to ignore the tax rules. If your agreement qualifies for the old deduction rule, the IRS expects you to use it. However, you can modify the agreement in writing and have a court approve the modification, which would trigger the new rules going forward.
Do I need to report spousal support if I do not deduct it?
No. If your agreement is from 2019 or later, spousal support is not reported on your federal tax return at all — neither as a deduction nor as income. It is straightforward a personal financial obligation between you and your ex-spouse.
What happens if I deduct spousal support but the IRS says I should not have?
The IRS may disallow the deduction and assess additional tax, penalties, and interest. If you believe you filed incorrectly, file an amended return (Form 1040-X) as soon as possible. The sooner you correct it, the lower the penalties may be.
Does spousal support affect my child tax credits or other deductions?
Spousal support itself does not reduce your income for purposes of other deductions or credits. However, if you deduct spousal support under the old rules, it does reduce your adjusted gross income, which can affect whether you may have access to for certain credits or deductions that have income limits.