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

The Tax Cuts and Jobs Act, which took effect in 2018, eliminated the federal income tax deduction for alimony payments made under any divorce or separation agreement signed after December 31, 2018. If your agreement is dated 2019 or later, you cannot deduct alimony on your federal tax return, even if you are paying it. The person receiving alimony also cannot report it as income.

If your agreement is dated before January 1, 2019, the old rules still explore to you: you can deduct alimony payments, and the recipient must report them as income. This is one of the few areas of tax law where the date of your agreement matters more than the year you are filing.

The change was permanent. Congress did not set an expiration date, so unless the law changes again, all agreements signed in 2019 and beyond will follow the no-deduction rule for the life of the payments.

Key Takeaways

  • Alimony is deductible only if your divorce decree or separation agreement is dated before January 1, 2019.
  • For pre-2019 agreements, you deduct alimony on Schedule 1 (Form 1040) as an adjustment to income, not as an itemized deduction.
  • The recipient of alimony under a pre-2019 agreement must report it as income on their tax return.
  • Payments to a spouse or ex-spouse while you are still married are not alimony for tax purposes and were never deductible.
  • Child support is never deductible, regardless of when your agreement was signed.

How to tell whether your agreement qualifies for the deduction

The critical date is when your divorce decree or separation agreement was signed, not when your divorce was finalized, not when payments began, and not the tax year you are filing. If the document is dated December 31, 2018 or earlier, the deduction applies. If it is dated January 1, 2019 or later, it does not.

Some people have modified their agreements after the cutoff date. If you signed an original agreement before 2019 but then modified it in 2019 or later, the IRS treats the modification as a new agreement under the new rules — meaning no deduction for payments made after the modification, even though the original agreement was deductible. This is a common trap. If you are considering modifying an agreement, check with a tax professional or family law attorney first about the tax consequences.

Agreements that were signed before 2019 but contain language saying they will be treated as if signed after 2018 are also subject to the no-deduction rule. Some people added this language intentionally to avoid the income-reporting burden on the recipient. The IRS respects this election, so if your agreement contains such language, you cannot deduct the payments.

Where to claim the deduction on your tax return

If you may have access to, you report alimony as an adjustment to income on Schedule 1 (Form 1040), not as an itemized deduction. This means you can claim it even if you take the standard deduction. You enter the total amount paid during the year and the recipient's Social Security number or Individual Taxpayer Identification Number (ITIN).

The IRS requires the recipient's identifying number because the agency cross-checks: your deduction should match the recipient's income report. If the numbers do not match, the IRS will contact one or both of you. Providing an incorrect or missing number can delay your refund or trigger an audit.

You report the deduction on your federal return only. Some states that have their own income tax may have different rules, so check your state's guidance if you live in a state with income tax.

What counts as alimony for tax purposes

Alimony for tax purposes is a payment made to a spouse or former spouse under a divorce or separation agreement. The payment must be in cash (or a cash equivalent like a check or electronic transfer). Transfers of property, payment of debts in the other person's name, or payments for housing, utilities, or insurance do not count as alimony, even if the agreement calls them that.

The payments must be required by the agreement — not voluntary. If you pay more than the agreement requires, the excess is not deductible. If the agreement says you must pay $2,000 per month and you pay $2,500, only the $2,000 is deductible.

The payments must stop at the death of the recipient. If your agreement says payments continue to the recipient's estate or heirs, the IRS will not treat the entire stream as alimony. Some or all of it may be treated as a property settlement instead, which is never deductible.

Child support is never deductible

Child support is not deductible under any circumstances, regardless of when your agreement was signed. If your agreement specifies an amount as child support, that portion is off-limits. If the agreement does not clearly separate alimony from child support, the IRS may allocate part of your payment to child support based on the facts — and that portion will not be deductible.

This matters because some agreements lump alimony and child support together in a single payment amount. If the agreement does not specify how much is for each purpose, the IRS has rules for determining the split. Generally, if a payment is scheduled to decrease when a child reaches age 18 or 21, the IRS will treat the decrease as evidence that part of the original payment was child support. The amount of the decrease is presumed to be child support; the rest is alimony.

What happens if you claimed the deduction but your agreement does not may have access to

If you deducted alimony on a return and the IRS later determines your agreement was signed in 2019 or later, you will owe back taxes plus interest on the deduction you claimed. The IRS may also assess penalties if the error was substantial or if you did not have reasonable cause for the mistake.

If you realize you made this error, you can file an amended return (Form 1040-X) for the year in question. The statute of limitations for amending a return is generally three years from the original filing date, though it can be longer if you underreported income by 25 percent or more. Filing an amended return voluntarily is usually better than waiting for the IRS to contact you, because it may reduce or eliminate penalties.

The recipient of the alimony faces a mirror problem: if they reported alimony as income but your agreement does not may have access to, they may have overpaid their taxes. They can also file an amended return to remove the income and claim a refund.

State tax treatment of alimony

Federal tax law and state tax law do not always match. Some states that have income tax have kept the old alimony deduction rule, meaning you can deduct alimony on your state return even if you cannot on your federal return. Other states have adopted the federal rule. A few states have no income tax at all.

You will need to check your state's specific rules. Your state tax form or your state's department of revenue website will tell you whether alimony is deductible for state purposes. If your state allows the deduction but the federal government does not (or vice versa), your federal and state returns will show different amounts of alimony.

Frequently Asked Questions

Can I deduct alimony if I am still married but separated?

No. For tax purposes, alimony must be paid under a divorce decree or a legal separation agreement. Payments to a spouse you are still married to, even if you are living apart, are not alimony and are not deductible. You must have a signed legal document that establishes the separation or divorce.

What if my agreement says alimony but the payments are really for property division?

The IRS looks at the substance of the arrangement, not just the label. If the agreement specifies a fixed total amount that does not depend on the recipient's income or circumstances, it may be treated as a property settlement rather than alimony. Property settlements are never deductible. If you are unsure, consult a tax professional before claiming the deduction.

Do I need to report the recipient's Social Security number even if I do not know it?

Yes, you must provide it or a valid ITIN. If you do not have it, contact your ex-spouse or their attorney. If they refuse to provide it, you cannot claim the deduction. The IRS will not accept a return with a missing or incorrect number without verification.

If my agreement was signed before 2019 but I modified it in 2020, can I still deduct the payments?

No. A modification signed after December 31, 2018 is treated as a new agreement under the new rules. Payments made after the modification date are not deductible. Only payments made before the modification under the original agreement may be deductible, depending on the terms.

Is alimony deductible if I pay it to a same-sex ex-spouse?

Yes. The deduction rules explore equally to all former spouses, regardless of the gender or sex of either party. The date of the agreement and the nature of the payment are what matter for the deduction, not the relationship of the parties.