Do You Have to File Taxes If You Receive Alimony and SSDI?
Receiving both alimony and SSDI puts you at an intersection of two separate tax systems — Social Security rules and IRS rules — that don't always talk to each other in obvious ways. Whether you're required to file a federal tax return depends on how much you receive from each source, when your divorce was finalized, and a few other factors that vary from person to person.
Here's how both income streams are treated, and what determines whether a tax return is required.
How SSDI Is Taxed — and When It Isn't
SSDI benefits are not automatically tax-free. Whether they become taxable depends on your combined income, which the IRS calculates using a specific formula:
Combined income = Adjusted Gross Income + nontaxable interest + 50% of your Social Security benefits
| Combined Income (Single Filer) | Portion of SSDI That May Be Taxable |
|---|---|
| Below $25,000 | None |
| $25,000 – $34,000 | Up to 50% |
| Above $34,000 | Up to 85% |
| Combined Income (Married Filing Jointly) | Portion of SSDI That May Be Taxable |
|---|---|
| Below $32,000 | None |
| $32,000 – $44,000 | Up to 50% |
| Above $44,000 | Up to 85% |
These thresholds have been in place for years but don't adjust for inflation, which means more recipients cross them over time as benefit amounts rise with annual cost-of-living adjustments (COLAs).
It's worth noting: SSI (Supplemental Security Income) is never taxable, regardless of other income. If you're unsure which program you're on, check your award letter or annual SSA benefit statement — the distinction matters here.
How Alimony Affects Your Tax Picture 📋
This is where the year your divorce was finalized becomes critical.
Divorce finalized before January 1, 2019: Under the old rules, alimony was deductible for the payer and taxable income for the recipient. If your divorce agreement predates 2019, alimony you receive counts as taxable income and gets added to your AGI.
Divorce finalized on or after January 1, 2019: The Tax Cuts and Jobs Act changed everything. Alimony is no longer deductible for the payer and no longer taxable for the recipient under agreements finalized under the new rules. That means it doesn't factor into your AGI at all.
This single distinction can dramatically change whether your SSDI becomes taxable — or whether you're required to file at all.
Why the Combination of Both Income Sources Creates Complexity 🔍
If your alimony is taxable (pre-2019 divorce), it increases your AGI directly. That higher AGI feeds into the combined income formula the IRS uses to determine how much of your SSDI — if any — becomes taxable.
Example of how the math can shift: A single filer receiving $18,000 annually in SSDI might have zero taxable benefits when that's their only income. But add $12,000 in taxable alimony, and the combined income calculation may push 50% of their SSDI into taxable territory. Add more alimony, and they could cross the 85% threshold.
If your alimony is non-taxable (post-2019 divorce), it doesn't enter the combined income formula. Your SSDI taxability is calculated based only on your other income sources.
When Are You Actually Required to File?
The IRS filing requirement depends on your gross income, filing status, and age — not on SSDI alone. For most people, the threshold for single filers in recent years has been around $13,850–$14,700 (it adjusts annually), but SSDI complicates this because only the taxable portion of your benefits counts toward gross income for filing purposes.
If your combined income is below the thresholds where SSDI becomes taxable, and your only other income is non-taxable alimony, you may technically fall below the filing requirement. But that's not a reason to assume you're clear — it depends on precise numbers.
Reasons you might still want to file even if not required:
- You had federal income tax withheld from other sources
- You may qualify for certain refundable credits
- You want a documented record for future purposes
State Taxes Add Another Layer
Most states don't tax SSDI, and some states don't tax alimony either — but rules vary significantly. A handful of states follow the federal treatment of SSDI; others exempt it entirely regardless of income. Whether your state taxes pre-2019 alimony the same way the IRS does also varies.
Variables That Shape Individual Outcomes
Whether you need to file — and what you'd owe — depends on:
- Pre- or post-2019 divorce: determines whether alimony is taxable income
- Total combined income: drives SSDI taxability
- Filing status: thresholds differ for single, married, head of household
- Age: those 65+ have slightly higher standard deduction thresholds
- State of residence: state-level treatment of both income streams varies
- Whether you received SSDI back pay: lump-sum back pay has its own calculation method to limit the tax hit
Someone receiving modest SSDI and non-taxable alimony under a recent divorce agreement may owe nothing and have no filing requirement. Someone receiving substantial taxable alimony under a pre-2019 agreement, combined with average SSDI benefits, could find 85% of their SSDI exposed to federal income tax.
The program rules are clear. Where any individual lands within them depends entirely on the specifics of their income, their divorce agreement, their filing status, and their state.
