The rule that changed for good in 2019

For decades, alimony worked like a tax hand-off. The spouse paying it deducted every dollar, and the spouse receiving it reported every dollar as income. Because payers were usually in a higher tax bracket than recipients, the arrangement cut the couple’s combined tax bill, and settlements were often negotiated around that savings.

The Tax Cuts and Jobs Act of 2017 ended that for new agreements. According to IRS Topic 452, the payer can’t deduct alimony or separate maintenance paid under a divorce or separation agreement executed after 2018, and the recipient doesn’t include those payments in gross income. The IRS’s detailed rules are in Publication 504, Divorced or Separated Individuals.

“Executed” is the word that matters

The rule turns on the date the specific instrument requiring the payments was executed: a divorce decree, a separate maintenance decree or a written separation agreement. That’s not always the date your divorce became final, and it’s never the date you moved out. A temporary support order signed in 2018 and a final decree signed in 2019 can be different instruments with different tax treatment. If your case straddled the end of 2018, get the exact dates in front of a tax professional before you assume which side you’re on.

What it costs in real numbers

That shift is why the date matters so much during negotiation. The payer now carries the full tax cost of the income used to pay support, and the recipient keeps every dollar. Settlement amounts often move to reflect that, which is a conversation to have with your attorney before numbers are final, not after.

The grandfathered exception

Pre-2019 If your divorce or separation instrument was executed on or before December 31, 2018, the old treatment generally still applies in 2026 and beyond: the payer deducts qualifying payments and the recipient reports them as income. There is no phase-out. A grandfathered agreement can keep its old treatment for as long as payments continue, unless it’s modified in the specific way described in the next section.

Payments still have to qualify as alimony

Grandfathered status doesn’t make every payment deductible. Under IRS Topic 452, a payment counts as alimony only if it meets all of these conditions:

• The spouses don’t file a joint return with each other.
• It’s paid in cash, including checks and money orders, not property.
• It’s paid to or for a spouse or former spouse under a divorce or separation instrument.
• If you’re legally separated under a decree, you aren’t living in the same household when the payment is made.
• There’s no obligation to keep paying after the recipient’s death.
• It isn’t treated as child support or a property settlement.
• The agreement doesn’t designate the payment as non-deductible and non-taxable.

Payments that never count as alimony include child support, non-cash property settlements, the other spouse’s share of community property income, payments to maintain the payer’s own property, and voluntary payments the agreement doesn’t require.

How grandfathered alimony is reported

Both sides report on Schedule 1 (Form 1040). The payer takes the deduction as an adjustment to income, so it’s available whether or not you itemize, and enters the recipient’s Social Security number or ITIN along with the date of the original agreement. The IRS says leaving out the recipient’s number can get the deduction disallowed and trigger a $50 penalty. The recipient reports the payments as income on Schedule 1 and must give the payer their SSN or ITIN, or risk the same $50 penalty.

The old rules also included “recapture” for front-loaded alimony that dropped sharply in the first three years. For nearly every grandfathered agreement, that three-year window closed long ago, but Publication 504 has the details if your payment schedule was unusual.

Because this depends on your exact execution date and every modification since, confirm your status with a tax professional before you file.

The modification trap

The good news first: an ordinary modification doesn’t cost you anything. Changing the amount, the schedule or the end date of a grandfathered agreement doesn’t, by itself, move it into the new rules. The IRS spells this out in Topic 452: the new treatment reaches a pre-2019 agreement only when the modification expressly says the repeal applies.

The trap is that the sentence is easy to miss. It can arrive inside a stipulation drafted by the other side, a standard clause in a form template, or a well-meant line like “the parties agree that payments shall be non-taxable to the recipient and non-deductible to the payer.” Once it’s in a signed modification, you can’t undo it by changing your mind at tax time.

It’s a trap for one side and a lever for the other

Opting into the new rules isn’t bad for everyone. It costs the payer the deduction and saves the recipient the tax. That makes the clause a bargaining chip: a recipient might ask for it, and a payer might agree to it in exchange for a lower monthly amount. What you want to avoid is giving it away without knowing you did.

Watch for a “new” agreement, not just a modified one

There’s a second, subtler risk. If an old agreement is replaced with an entirely new one rather than amended, there’s a question of whether the result is a new instrument executed after 2018. Where the line falls between modifying and replacing is fact-specific, so if your attorney proposes restating the whole agreement, ask directly how that affects the tax treatment.

California has its own opt-in clause

California’s 2026 law uses the same structure with a different trigger: an older California order moves to the new state rules only if a modification clearly says the SB 711 changes apply. The federal and California clauses refer to different laws, so language that adopts one doesn’t necessarily adopt the other. If you’re in California, make sure your modification addresses both on purpose.

California’s 2026 twist (SB 711)

When Congress repealed the alimony deduction, California kept its own rule. According to the California Franchise Tax Board, from January 1, 2019 through December 31, 2025, recipients reported alimony as income on their California return and payers could deduct it there. In practice that meant California filers adjusted between their federal and state numbers on Schedule CA (540) every year.

What SB 711 changed

SB 711, signed in October 2025, brings California in line with federal treatment. The California Courts Self-Help Center puts it plainly: if your spousal support order or agreement was made on or after January 1, 2026, the payer can’t deduct the payments on California forms and the recipient doesn’t report them as California income.

It is not retroactive

SB 711 applies only to orders and agreements made on or after January 1, 2026. If your California order was made before that date, the Self-Help Center says the payer can still deduct the payments on California forms and the recipient must still report them as California income. That includes orders from the 2019–2025 split years, which keep their split treatment going forward.

Changing an order doesn’t automatically change the tax rule

This is the point California’s own courts flag with a warning. If your order was made before January 1, 2026 and you change it after December 31, 2025, the same tax rules from the original order apply unless the new order clearly says the new tax laws apply. The FTB words it the same way: a pre-2026 instrument modified after 2025 moves to the new treatment only if the modification expressly provides that the SB 711 amendments apply.

If you only live in California part of the time

Having a California court order doesn’t mean California’s tax rules follow you. The Self-Help Center notes that if you don’t live in California full-time, you usually follow the tax laws of the state where you live most of the time. Anyone who moved in or out of California during the year should confirm with a tax advisor.

What it means for support amounts

SB 711 doesn’t change the dollar amount of any existing order. It does change the after-tax math for new ones, and California courts setting long-term support are required to consider the tax consequences to each party. Family law practitioners have reported that guideline temporary support figures now come out somewhat lower than they did under the old state rule for similar incomes, because the payer no longer gets a state deduction. Whether that justifies revisiting an existing order is a question for a family law attorney.

Other states set their own rules too. Most follow the federal treatment, but not every state does, so if you live outside California, confirm your state’s approach with a local tax professional or family law attorney.

Alimony vs. child support: don’t mix these up

Unlike pre-2019 alimony, child support has never been deductible for the parent who pays it or taxable for the parent who receives it; how the amount itself is set is covered in our 2026 state guide to how child support is calculated.

People blur the two because they often show up in the same decree and the same monthly transfer. For agreements signed in 2019 or later, the federal tax result is the same either way, so the confusion is mostly harmless. For grandfathered pre-2019 agreements, and for California orders from before 2026, the label decides whether a dollar is deductible or not, so the distinction carries real money.

Underpayments go to child support first

If an agreement requires both alimony and child support and the payer pays less than the full amount, the IRS applies the payments to child support first. Only what’s left over counts as alimony. A payer under a grandfathered agreement who falls behind can lose part of the deduction they expected, and the recipient reports less alimony income as a result.

Child-related reductions count as child support

If an alimony payment is set to drop when something happens to a child, such as turning 18, finishing school, marrying or getting a job, the amount of that drop is treated as child support rather than alimony. That rule is the root of the family support trap below.

The undesignated family support trap

Pre-2019 This one matters mainly for grandfathered agreements, where the line between alimony and child support still decides what’s deductible. Some decrees don’t split the payment into alimony and child support at all. They order one combined figure, often called “family support” or “unallocated support.” California courts, for example, can order family support as a single amount.

Historically, a combined payment could be treated entirely as alimony for tax purposes. The catch is the child-contingency rule in the pre-2019 version of the tax code (Internal Revenue Code section 71(c), which was repealed for new agreements but still governs grandfathered ones). If the combined payment drops when a child-related event happens, the amount of that drop is treated as child support, even if the decree never says so.

The IRS doesn’t need the decree to mention the child

Under the Treasury regulations, a reduction is presumed to be tied to a child in two situations:

• The payment drops within six months before or after a child reaches 18, 21 or the local age of majority.
• The payment drops two or more times, each within one year before or after a different child reaches the same age somewhere between 18 and 24.

The presumption can sometimes be rebutted, for example by showing the reduction was really about something else, such as a support period customarily used for alimony. But the burden falls on the taxpayer.

If you have a grandfathered agreement with an unallocated or family support figure that steps down around a child’s birthday, graduation or other milestone, have a tax professional review it before you file. In California, orders from 2019 through 2025 still use the old deductible and taxable treatment on the state return, so a California tax professional should confirm whether the same issue affects your state filing.

What this isn’t

This guide covers how alimony is taxed, not how child support is set; for the formulas and state-by-state rules, see How Is Child Support Calculated? A 2026 State Guide.

It’s also the tax-specific piece of a much bigger bill, and the rest of that picture, from filing fees to attorney and mediation costs, is in How Much Does a Divorce Cost in 2026?

FAQ

Is alimony tax deductible in 2026?

Only under a divorce or separation agreement executed on or before December 31, 2018 that hasn’t been modified to expressly adopt the new rules. For anything signed after 2018, there’s no federal deduction. In California, orders made before January 1, 2026 can still be deducted on the state return. Confirm your exact dates with a tax professional.

Is alimony taxable income for the person receiving it?

Federally, only under a grandfathered pre-2019 agreement. For agreements signed after 2018, it isn’t federal income. California recipients with orders made before 2026 generally still report it on their California return.

When exactly did alimony stop being tax deductible?

For divorce or separation instruments executed after December 31, 2018. An agreement signed on December 31, 2018 falls under the old rules; one signed on January 1, 2019 falls under the new ones.

Will the alimony deduction come back when the 2017 tax law expires?

No. The alimony repeal was written without an expiration date, unlike many of the law’s other individual provisions. Nothing reverts automatically. Only a new act of Congress could restore it.

We filed for divorce in 2018 but it was finalized in 2019. Which rule applies?

It depends on when the instrument requiring the payments was executed, not when you filed. If support is paid under a final decree signed in 2019, the new rules generally apply to those payments. If a temporary order signed in 2018 also required payments, those could be treated differently. This is exactly the kind of case to check with a tax professional.

If I modify my pre-2019 agreement, do I lose the deduction?

Not automatically. You lose the old treatment only if the modification expressly states that the repeal of the alimony deduction applies. Get tax advice before agreeing to any tax language in a modification.

Is spousal support deductible on my California state return?

If your order or agreement was made before January 1, 2026, generally yes, and the recipient reports it as California income. If it was made on or after that date, no. A pre-2026 order changed after 2025 keeps the old California rule unless the new order clearly says the new tax laws apply.

Is SB 711 retroactive?

No. It applies to orders and agreements made on or after January 1, 2026. Older orders keep their existing California treatment unless a later modification clearly adopts the new rules.

I have a California order but moved to another state. Which rules apply?

According to the California Courts Self-Help Center, if you don’t live in California full-time you usually follow the tax laws of the state where you live most of the time. Talk to a tax advisor about your specific situation.

Is child support tax deductible?

No. Child support has never been deductible by the payer or taxable to the recipient, under any version of the law. That was true before 2019, and it’s still true now.

What happens if I pay less than the total I owe in alimony and child support?

The IRS applies the payment to child support first. Only the amount left over counts as alimony, which matters for grandfathered agreements where alimony is still deductible.

What is undesignated family support, and how does the IRS treat it?

It’s a single combined payment that covers both spousal and child support without splitting them. Under a grandfathered agreement, it may be treated as alimony, but any part that drops at a child-related milestone, like a child turning 18, is treated as child support from the start. See the family support trap.

Are lump-sum or property settlement payments treated as alimony?

No. Non-cash property settlements, whether paid all at once or in installments, aren’t alimony and aren’t deductible or taxable as alimony, under either the old or new rules.

Where do I report grandfathered alimony on my tax return?

On Schedule 1 of Form 1040. The payer claims it as an adjustment to income and enters the recipient’s SSN or ITIN and the date of the original agreement. The recipient reports it as income. Missing identification numbers can lead to a disallowed deduction and a $50 penalty.

What is spousal support, and is it the same as alimony?

Yes. “Spousal support,” “alimony” and “separate maintenance” all describe payments to a spouse or former spouse under a divorce or separation instrument. California uses “spousal support.” The tax rules in this guide apply regardless of the label, as long as the payment meets the IRS definition.

How is alimony calculated, and does the tax change affect the amount?

Each state sets its own approach, and many courts weigh factors like income, marriage length and each spouse’s needs. The tax change doesn’t set the amount, but it changes each side’s after-tax result, and courts and negotiators often take that into account. California courts, for example, must consider each party’s tax consequences when setting long-term support.