Alimony does not count as income for SSDI purposes, but it is taxable income for federal tax purposes

If you receive alimony and SSDI, the two programs treat the money differently. Social Security does not count alimony as "income" when deciding whether you can work or how much SSDI to pay you. However, the IRS counts alimony as taxable income on your federal tax return. This means you may owe taxes on alimony even though it does not reduce your SSDI check.

The distinction matters because SSDI has an earnings test—money you earn from work can reduce your benefit. Alimony bypasses that test entirely. But at tax time, alimony sits on your return just like wages would, and you report it on Form 1040.

The tax treatment of alimony changed in 2019. Alimony paid under divorce or separation agreements signed after December 31, 2018, is no longer taxable to the recipient and no longer deductible by the payer. Alimony from agreements signed before that date remains taxable to you and deductible to the payer, unless you and your ex-spouse agree in writing to treat it as non-taxable.

Key Takeaways

  • Alimony does not reduce your SSDI check because Social Security does not count it as earnings income.
  • Alimony from pre-2019 divorce agreements is taxable income on your federal return; post-2018 alimony is not taxable unless your agreement says otherwise.
  • You report taxable alimony on Form 1040, line 5a, and you must have your ex-spouse's Social Security number to claim it.
  • If you receive both SSDI and taxable alimony, your combined income may push you into a tax bracket where part of your SSDI becomes taxable.

Why SSDI ignores alimony but the IRS does not

Social Security's earnings test applies only to work income—wages, self-employment profit, and certain other forms of compensation for labor. Alimony is a transfer payment, not earnings. Because you did not work to receive it, it does not trigger the earnings limit that would otherwise reduce your SSDI.

The IRS, by contrast, taxes most income that flows to you, regardless of its source. Alimony has historically been treated as taxable income to the recipient because it represents a real economic benefit. The 2017 Tax Cuts and Jobs Act changed this rule for new agreements, reflecting a policy shift away from taxing alimony at all.

This split treatment can feel confusing: you report alimony on your tax return, but Social Security pretends it does not exist. That is because the two agencies have different missions. Social Security cares whether you are working. The IRS cares whether you have income to tax.

How to report alimony on your tax return

If your alimony is taxable (from a pre-2019 agreement, or a post-2018 agreement where you and your ex agreed to keep it taxable), you report it on Form 1040, line 5a. You must enter your ex-spouse's Social Security number on the form. If you do not have it, contact your ex or their attorney to obtain it—the IRS will reject the return without it.

You cannot claim alimony as a deduction or credit. It is ordinary income, taxed at your marginal rate. If you also receive SSDI, your total income (including alimony) determines whether any of your SSDI becomes taxable under the "combined income" formula.

If you file electronically, the software will prompt you for the payer's SSN. If you file by paper, write it clearly on line 5a. Keep a copy of your divorce decree or separation agreement handy in case the IRS asks for proof that the payments are alimony and not something else (such as child support, which is never taxable).

When alimony pushes your SSDI into taxable territory

SSDI itself is not automatically taxable. However, if your "combined income" exceeds a threshold, part of your SSDI becomes taxable. Combined income is calculated as your adjusted gross income (AGI) plus nontaxable interest plus half your SSDI benefit.

If you receive taxable alimony, it raises your AGI, which raises your combined income. Once combined income exceeds $25,000 (single filer) or $32,000 (married filing jointly), up to 50 percent of your SSDI may be taxable. If combined income exceeds $34,000 (single) or $44,000 (married), up to 85 percent of your SSDI may be taxable.

Example: You receive $1,200 per month in SSDI ($14,400 per year) and $500 per month in taxable alimony ($6,000 per year). Your AGI is $6,000. Half your SSDI is $7,200. Combined income is $6,000 + $7,200 = $13,200. This is below $25,000, so none of your SSDI is taxable. But if you also have $15,000 in other income (such as part-time work), combined income becomes $28,200, and some of your SSDI becomes taxable.

Alimony from post-2018 agreements and tax-free treatment

If your divorce or separation agreement was signed after December 31, 2018, alimony is not taxable to you by default. You do not report it on your tax return, and it does not raise your AGI or combined income. This is a major change from the old rule.

However, you and your ex-spouse can elect to treat post-2018 alimony as taxable anyway. This is rare but can happen if, for example, your ex wants the deduction and you are in a low tax bracket. If you make this election, you must attach a statement to your return saying you are treating the alimony as taxable under the old rules. Your ex must also attach a statement to their return claiming the deduction.

If you are unsure whether your agreement was signed before or after December 31, 2018, check the date on the final divorce decree or separation agreement. If it is dated 2019 or later, assume the alimony is not taxable unless you have a written agreement with your ex saying otherwise.

Alimony and other SSDI rules

Alimony does not affect your SSDI in any other way. It does not count toward the resources limit (which caps how much you can own and still receive SSDI). It does not trigger the Substantial Gainful Activity (SGA) test. It does not affect your Medicare coverage or your Medicaid status, if you receive Medicaid.

If you are in a trial work period or using a work incentive such as Impairment Related Work Expenses (IRWE), alimony does not reduce the amount you can earn before your SSDI stops. Only actual work income counts against those limits.

Child support is never taxable, so if you receive child support in addition to alimony, do not report the child support on your tax return. Make sure your divorce decree clearly labels which payments are alimony and which are child support, because the IRS will ask if the two are mixed together.

What to do if you receive alimony and SSDI

First, confirm the date of your divorce or separation agreement. If it is dated 2019 or later, your alimony is not taxable and you do not need to report it. If it is dated 2018 or earlier, your alimony is taxable unless you have a written agreement with your ex to treat it otherwise.

If your alimony is taxable, obtain your ex-spouse's Social Security number and report the alimony on Form 1040, line 5a. Use tax software or a tax professional to calculate whether the alimony pushes your combined income high enough to make part of your SSDI taxable. If it does, you may owe taxes on both the alimony and a portion of your SSDI.

File your tax return by the April 15 important date (or October 15 if you request an extension). If you owe taxes, you can pay in full or set up a payment plan with the IRS. If you are low-income, you may be able to claim the Earned Income Tax Credit (EITC) or other credits that reduce your tax bill, though alimony does not count as earned income for EITC purposes.

Frequently Asked Questions

Does alimony count as income for the SSDI earnings test?

No. Social Security only counts work income—wages, self-employment profit, and certain other compensation for labor—toward the earnings test. Alimony is a transfer payment and does not reduce your SSDI check.

What if I do not have my ex-spouse's Social Security number?

Contact your ex or their attorney to request it. You cannot file your return without it if you are reporting taxable alimony. If your ex refuses to provide it, you may be able to use an Individual Taxpayer Identification Number (ITIN) instead, but check with a tax professional first.

Can I claim alimony as a deduction on my taxes?

No. Only the payer can deduct alimony (and only if the agreement is dated before 2019). As the recipient, you report it as income but cannot deduct it. You also cannot claim it as a credit.

If my alimony is not taxable, do I still report it to Social Security?

No. If your alimony is from a post-2018 agreement, it is not taxable and you do not report it anywhere—not to the IRS and not to Social Security. It has no effect on your SSDI or your taxes.

What happens if I remarry—does that change the tax treatment of alimony?

Remarriage does not change whether alimony is taxable. The tax rule depends on the date of the divorce agreement, not on your current marital status. However, if you remarry, your filing status changes to "married filing jointly" or "married filing separately," which affects the combined income thresholds for SSDI taxation.