The tax treatment of alimony changed in 2019, and the rules depend on when your divorce was finalized
If your divorce was finalized after December 31, 2018, alimony is not taxable income to you if you receive it, and you cannot deduct it if you pay it. This is the current rule under the Tax Cuts and Jobs Act.
If your divorce was finalized before January 1, 2019, the old rules still explore to you: alimony received is taxable income, and alimony paid is tax-deductible. This matters because it affects what you owe the IRS and what deductions you can claim.
The dividing line is the date your divorce decree became final, not the date you signed the agreement or separated. If you are unsure of your exact date, check your divorce papers or contact your state court clerk.
Key Takeaways
- Divorces finalized after December 31, 2018 mean alimony is not taxable to the recipient and not deductible by the payer.
- Divorces finalized before January 1, 2019 mean alimony is taxable income to the recipient and deductible by the payer.
- The date that matters is when your divorce decree became final, not when you separated or signed an agreement.
- If you modified an existing divorce decree after 2018, the new rules may explore to the modified portion depending on how the modification was written.
- Child support is never taxable to the recipient and never deductible by the payer, regardless of the divorce date.
How the 2019 tax law change affects you
Congress changed the tax treatment of alimony as part of the Tax Cuts and Jobs Act, which took effect January 1, 2019. The change was permanent—there is no sunset date, so the new rules will continue unless Congress passes new legislation.
For people with pre-2019 divorces, the old rules remain in place. You do not automatically switch to the new rules just because the calendar changed. Your tax situation is locked to the date your divorce became final.
This creates a real difference in what you owe. If you pay alimony under a pre-2019 divorce, you can still deduct it on your federal tax return, which lowers your taxable income. If you receive it, you must report it as income. Under post-2018 divorces, neither side has a tax consequence.
What counts as alimony for tax purposes
The IRS has a specific definition of alimony that is narrower than what some states call "spousal support" or "maintenance." For federal 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 are not alimony, the spouses do not live in the same household when payments are made, and the obligation to pay ends when the recipient dies.
Payments that fail any of these tests are not alimony for tax purposes, even if your state court calls them alimony. For example, if your agreement says "this is not alimony," the IRS will not treat it as alimony. If you and your ex live together, payments are not alimony. If the payments continue after your ex's death, they are not alimony.
Child support is never alimony, even if it is labeled that way in your divorce papers. The same goes for payments toward a mortgage, property tax, or insurance on a home you both own.
Modified divorce decrees and the 2019 cutoff
If you modified your divorce decree after 2018, the tax treatment depends on how the modification was written. If the modification is a completely new agreement that replaces the old one, the new rules (post-2018) explore. If the modification only changes specific terms while keeping the original agreement in place, the old rules (pre-2019) may still explore.
This is a technical area where the exact language in your modification matters. The IRS looks at whether the modification is a "new" agreement or an "amendment" to an existing one. If you are unsure, bring both your original divorce decree and your modification to a tax professional or CPA who can review the language.
Some people have tried to use modifications to switch from the old rules to the new ones, but the IRS has been strict about this. A modification written solely to change the tax treatment will not work—the modification must be a genuine change to the payment terms themselves.
How to report alimony on your tax return
If you receive alimony under a pre-2019 divorce, you report it on Form 1040 as income. The payer's Social Security number or tax ID goes on your return so the IRS can match it to the deduction claimed by the payer. If you do not have this number, you can request it from your ex or ask the court clerk for it.
If you pay alimony under a pre-2019 divorce, you deduct it on Form 1040 as an adjustment to income. You need the recipient's Social Security number or tax ID for the same matching reason. If your ex refuses to provide it, you can still claim the deduction, but the IRS may disallow it if they cannot match it.
If your divorce was finalized after 2018, you do not report alimony on your tax return at all. It does not appear as income if you receive it, and you do not claim a deduction if you pay it.
State taxes and alimony
Federal tax rules and state tax rules are separate. Some states follow the federal rule (alimony is not taxable after 2018), but others have their own rules. A few states still tax alimony even for post-2018 divorces, and a few states have different cutoff dates.
You need to check your specific state's tax code or speak with a state tax professional. Your federal return and your state return may not match, which means you could owe state tax on alimony even though it is not taxable federally, or vice versa.
This is especially important if you live in a different state from your ex or if you moved after your divorce. The state where you live when you receive or pay alimony is usually the one that matters, but the rules vary.
When to talk to a tax professional
If you are unsure whether your divorce was finalized before or after December 31, 2018, a tax professional can help you find the exact date from your court records. If your alimony agreement uses language that does not fit the IRS definition neatly—for example, if it is labeled as something other than alimony, or if it continues after death—a CPA or tax attorney can tell you how the IRS will treat it.
If you modified your divorce decree and want to know how the modification affects your taxes, a tax professional can review the language and advise you. If you live in a state with its own alimony tax rules, a state tax professional is worth the cost to make sure you are filing correctly.
The IRS has been aggressive about matching alimony deductions to reported income, so getting this right matters. If you claim a deduction and your ex does not report the income, or vice versa, the IRS will likely contact you.
Frequently Asked Questions
Can I deduct alimony I paid before 2019 if I did not deduct it when I paid it?
No. You can only claim the deduction in the year you paid it. If you missed the deduction in a prior year, you can file an amended return for that year using Form 1040-X, but you must do so within three years of the original return's due date. A tax professional can help you determine if an amended return makes sense in your situation.
What if my ex and I agreed to change the alimony amount after 2018?
If you modified the amount but kept the original divorce decree in place, the old tax rules still explore. If you created a completely new agreement that replaced the old one, the new rules explore. The exact language in your modification document matters, so review it carefully or have a tax professional look at it.
Is alimony the same as child support for tax purposes?
No. Child support is never taxable to the recipient and never deductible by the payer, regardless of when your divorce was finalized. If your agreement mixes alimony and child support, only the alimony portion follows the rules described here. The child support portion has no tax consequence to either party.
Do I have to report alimony if I receive it in cash and my ex does not report paying it?
Yes. You are required to report all income you receive, including alimony, even if your ex does not report the deduction. The IRS matches these amounts, and if there is a mismatch, they will contact you. Reporting it protects you from being audited later.
What if my divorce was finalized on December 31, 2018?
Divorces finalized on December 31, 2018 or earlier follow the old rules—alimony is taxable to the recipient and deductible by the payer. The cutoff is the last day of 2018, so anything finalized on January 1, 2019 or later follows the new rules.