When You Can Deduct Alimony Payments on Your Taxes

Alimony is tax deductible only if your divorce or separation agreement was signed before January 1, 2019

The tax treatment of alimony changed dramatically on January 1, 2019. If you signed your divorce decree or separation agreement before that date, you can deduct alimony payments you make from your income on your federal tax return. If you signed on or after January 1, 2019, you cannot deduct alimony payments, and your ex-spouse does not report them as income either.

This change was part of the Tax Cuts and Jobs Act passed in December 2017. The law reversed decades of tax policy that allowed payers to deduct alimony and required recipients to report it as taxable income. The new rule applies to all divorce decrees and separation agreements signed after December 31, 2018, regardless of when the divorce was finalized or when payments began.

If you are unsure when your agreement was signed, check the document itself — the signature date is what matters, not the date the divorce was final or the date you started paying. This distinction matters because some divorces take months or years to finalize after the agreement is signed.

Key Takeaways

• Alimony is deductible only if your divorce or separation agreement was signed before January 1, 2019.
• The signature date on the agreement determines the rule, not the date the divorce was finalized or payments began.
• If your agreement is from before 2019, you deduct alimony on Schedule 1 (Form 1040) as an adjustment to income.
• If you modified an agreement signed before 2019 to extend or increase payments after 2018, the modification may trigger the new non-deductible rule.
• Payments labeled as alimony in the agreement are treated as alimony for tax purposes, even if the state calls it something else.

How to deduct alimony on your tax return if you signed before 2019

If your divorce or separation agreement was signed before January 1, 2019, you report alimony payments on Schedule 1 (Form 1040), which is the supplemental income schedule that attaches to your main 1040 form. On Schedule 1, line 18 is labeled "Alimony paid" — this is where you enter the total amount you paid during the tax year.

The amount you enter reduces your adjusted gross income (AGI), which lowers your taxable income. This is an "above-the-line" deduction, meaning you get the benefit whether you itemize deductions or take the standard deduction. You do not need to itemize to claim it.

You will also need your ex-spouse's Social Security number to include on the form. The IRS uses this to match your deduction against their income report. If you do not have their SSN, you can still file, but the IRS may disallow the deduction or delay processing your return.

When a modification to your agreement changes the tax rule

If you and your ex-spouse modified your original agreement after December 31, 2018 — to extend payments, increase the amount, or change other terms — the modification itself may be treated as a new agreement signed on the modification date. This can flip you from the deductible rule to the non-deductible rule, even though the original agreement was signed before 2019.

The rule is strict: if the modification is a separate document that both parties sign, and it was signed on or after January 1, 2019, the IRS treats the modified terms as non-deductible going forward. Some modifications are informal or made by court order without a new signed agreement, and the tax treatment of those is less clear — this is a situation where a tax professional should review your specific documents.

If you are considering modifying an agreement, understand that doing so after 2018 will likely make future payments non-deductible. Some payers choose to live with the original terms to preserve the deduction.

What counts as alimony for tax purposes

The IRS has a specific definition of alimony that is narrower than what some states call "alimony." For tax purposes, alimony must meet all of these conditions: it is paid in cash (not property or services), it is paid to a spouse or former spouse under a divorce or separation agreement, the agreement does not say the payments end at the death of the recipient, and the spouses do not live in the same household when payments are made.

Payments that end automatically when your ex-spouse dies are treated as alimony. Payments that would continue to their estate or heirs if they died are not alimony for tax purposes — they are treated as property division or something else, and they are not deductible.

Child support is never deductible, even if it is part of the same agreement. If your agreement lumps alimony and child support together in one payment, you and your ex-spouse must allocate the payment between the two types. Only the alimony portion is deductible. If you cannot agree on the allocation, the IRS will make the allocation for you, and it is usually unfavorable to the payer.

Reporting requirements for your ex-spouse

If your agreement was signed before 2019 and you deduct alimony, your ex-spouse must report the same amount as income on their tax return. They report it on Schedule 1, line 19 ("Alimony received"). This is income to them whether or not they need the money or whether they are working.

Your ex-spouse cannot avoid reporting alimony income by refusing to file a return or by claiming they do not owe taxes. The IRS expects both sides of the transaction to match. If you deduct $15,000 in alimony and your ex-spouse does not report $15,000 in alimony income, the IRS will likely contact one or both of you.

This is one reason why the 2019 rule change was controversial — it eliminated the income tax burden on recipients, which some saw as a benefit and others saw as a loss of transparency in the tax system.

Agreements signed in 2019 or later: no deduction

If your divorce or separation agreement was signed on January 1, 2019 or any date after that, alimony payments are not deductible on your federal tax return. You cannot deduct them on Schedule 1 or anywhere else. Your ex-spouse does not report alimony as income either.

This applies even if you are paying substantial amounts or if the agreement specifically calls the payments "alimony." The date of the agreement is the only factor that matters. State law does not override this rule — some states still call payments "alimony," but the federal tax code does not recognize them as deductible.

If you are negotiating a new divorce settlement, this rule affects the after-tax cost of alimony to you and the after-tax value to your ex-spouse. Many payers now factor this into settlement discussions, sometimes by increasing the payment amount to offset the loss of the deduction.

Frequently Asked Questions

Can I deduct alimony if my divorce was finalized after 2018 but the agreement was signed before 2019?

Yes. The signature date on the agreement is what determines the rule, not the date the divorce was finalized or the date you started paying. If you signed the agreement in 2018 and the divorce was finalized in 2019, alimony is still deductible because the agreement predates January 1, 2019.

What if my agreement does not use the word "alimony"?

The label does not matter. If the payment meets the IRS definition of alimony — cash payments to a former spouse under a divorce agreement, ending at death, with spouses living apart — it is treated as alimony for tax purposes regardless of what your state or agreement calls it. Some states use terms like "spousal support" or "maintenance," but the tax rule is the same.

Do I need to report my ex-spouse's Social Security number to deduct alimony?

You should include it on Schedule 1 if you have it. The IRS uses the number to cross-check your deduction against their income report. If you do not have it, you can still file, but the IRS may disallow the deduction or delay your refund while they investigate.

If I stop paying alimony, do I still deduct the years I did pay?

You deduct alimony only for the years you actually paid it. If you paid alimony in 2020 and 2021 but stopped in 2022, you deduct it on your 2020 and 2021 returns but not on your 2022 return. If you owe back alimony, you cannot deduct amounts you did not pay.

Can I deduct alimony if I paid it to my spouse while we were still married?

No. Alimony is deductible only if it is paid under a divorce or separation agreement. Payments to a spouse you are still married to are not alimony for tax purposes, even if a court ordered them or you and your spouse agreed to them in writing.