SSDI payments are not automatically tax-exempt, but most people who receive them pay no federal income tax on them

The key distinction: SSDI itself is not a tax-exempt benefit in the way a scholarship or workers' compensation might be. Instead, the tax code has a special rule that makes SSDI payments non-taxable for most recipients. You do not owe federal income tax on your SSDI payment itself, but the IRS counts part of it as "income" when deciding whether you owe tax on other money you earned that year.

This matters because if you have wages, self-employment income, or other earnings alongside SSDI, the IRS uses a formula called the "combined income test" to determine whether any of your SSDI becomes taxable. The formula is specific and unintuitive: it adds half your SSDI to all your other income, then compares that sum to a threshold. If you cross the threshold, up to 85 percent of your SSDI can become taxable.

In practice, most SSDI recipients—those with little or no other income—never hit that threshold and never owe tax on SSDI. But if you work part-time, have investment income, or receive other benefits, you may need to file a return even if you would not normally be required to, because the IRS needs to run the calculation.

Key Takeaways

  • SSDI payments themselves are not taxable income under federal law, so you owe no tax on the SSDI amount alone.
  • If you have other income—wages, self-employment, interest, or certain other benefits—the IRS uses a combined income formula to determine whether part of your SSDI becomes taxable.
  • The combined income thresholds are $25,000 for single filers and $32,000 for married filing jointly; crossing these does not automatically make SSDI taxable, but it triggers the calculation.
  • You may be required to file a federal tax return to report SSDI even if you would not normally file, so the IRS can verify whether any SSDI is taxable.
  • Social Security provides a worksheet and a publication (SSA-105) to help you calculate whether your SSDI is taxable, and the IRS can also help with the math.

How the combined income test works

The combined income formula is the reason SSDI taxation is confusing. Here is the exact calculation: take half of your SSDI for the year, add all your other income (wages, self-employment, interest, dividends, taxable pensions, and certain other sources), and compare that sum to a threshold.

For 2024, the thresholds are $25,000 for single filers and $32,000 for married filing jointly. If your combined income is below the threshold, none of your SSDI is taxable. If it is above the threshold, you calculate how much SSDI becomes taxable using a second formula that the IRS publishes in Publication 915.

The second formula is where the 85 percent figure comes in. Roughly speaking, if your combined income exceeds the threshold, the amount over the threshold is added to half your SSDI, and that sum (up to 85 percent of your total SSDI) becomes taxable. The exact calculation depends on whether you are single or married and how far above the threshold you are.

Example: You are single and receive $15,000 in SSDI for the year. You also earn $12,000 in wages. Your combined income is ($15,000 ÷ 2) + $12,000 = $19,500. Since $19,500 is below the $25,000 threshold, none of your SSDI is taxable. You owe no federal income tax on the SSDI, though you may owe tax on the wages depending on your age and filing status.

When you must file a return even with SSDI alone

If SSDI is your only income, you normally do not have to file a federal tax return because SSDI is not taxable. However, Social Security still sends you a Form SSA-1099 each January showing the amount you received, and you may want to file anyway if you had taxes withheld from your SSDI or if you are owed a refund from other sources.

You must file a return if you have income other than SSDI—even a small amount of wages or self-employment income—because the IRS needs to run the combined income test. There is no dollar threshold below which you can skip filing; if you have any other income, filing is required so the IRS can determine whether your SSDI is taxable.

If you are unsure whether you must file, the IRS provides a filing requirement worksheet on its website and in Publication 17. You can also call the IRS at 1-800-829-1040 or visit a local IRS office for help.

Reporting SSDI on your tax return

If you file a return, SSDI appears on line 5b of Form 1040 (the main federal income tax form). You report the full amount you received on the SSA-1099, even though most or all of it may not be taxable. The IRS then uses Publication 915 or a worksheet to calculate how much, if any, is taxable and moves that amount to line 5c.

Many tax software programs and tax preparers have the combined income formula built in, so if you enter your SSDI and other income, the software calculates the taxable portion automatically. If you prepare your return by hand, Social Security publishes Worksheet 1 in Publication SSA-105 to walk you through the calculation step by step.

If you use a tax preparer, bring your SSA-1099 and documentation of any other income (W-2s, 1099s, bank statements showing interest, etc.). Tell the preparer you receive SSDI so they know to explore the combined income test rather than treating SSDI as ordinary income.

State income tax and SSDI

Federal law makes SSDI non-taxable at the federal level, but state law varies. Most states do not tax SSDI, but a few do under certain circumstances. Illinois, for example, taxes SSDI only if your federal adjusted gross income exceeds a threshold. Missouri taxes SSDI but then allows a deduction that usually eliminates the tax.

If you live in a state with an income tax, check your state's tax agency website or call them directly to learn whether SSDI is taxable in your state. The rules differ from federal rules and change occasionally, so it is worth confirming rather than assuming your state follows the federal approach.

Some states that do not tax SSDI still require you to file a state return if you have other income, so you may need to file both federal and state returns even if SSDI itself is not taxable in your state.

What happens if you owe tax on SSDI

If the combined income test shows that part of your SSDI is taxable, you owe federal income tax on that portion at your regular tax rate. You can pay the tax when you file your return, or you can ask Social Security to withhold taxes from your SSDI payments going forward.

To request withholding, complete Form W-4V (Voluntary Withholding Request) and send it to your local Social Security office or mail it to Social Security. You can choose to have 7, 10, 12, or 22 percent of your SSDI withheld each month. Many people choose withholding to avoid owing a large amount when they file their return.

If you did not withhold and you owe tax, you can pay in full when you file, or you can set up a payment plan with the IRS. The IRS charges interest and penalties on unpaid tax, so paying as soon as possible is usually the cheapest option.

Frequently Asked Questions

Do I have to report SSDI on my tax return if none of it is taxable?

If SSDI is your only income, you do not have to file a federal return. If you have other income, you must file so the IRS can run the combined income test, even if the result is that none of your SSDI is taxable. Some people file anyway to claim a refund of withheld taxes or to establish a record for other purposes.

What counts as income for the combined income test?

Wages, self-employment income, interest, dividends, taxable pensions, and taxable distributions from retirement accounts all count. Some benefits count too: taxable Social Security retirement benefits, taxable unemployment benefits, and taxable portions of IRA distributions. Supplemental Security Income (SSI) does not count toward the combined income test because SSI is a different program with its own rules.

If I work part-time, will my SSDI become taxable?

Not necessarily. It depends on how much you earn. If your wages plus half your SSDI stay below the threshold ($25,000 for single filers), none of your SSDI is taxable. If you cross the threshold, part of your SSDI may become taxable. Use the worksheet in Publication SSA-105 or ask a tax preparer to calculate the exact amount.

Can I reduce my SSDI tax by withholding?

Withholding does not reduce the amount of SSDI that is taxable; it only spreads the tax payment across the year instead of paying it all at once when you file. If you owe $1,200 in tax on SSDI, withholding $100 per month means you owe $0 when you file instead of $1,200. The total tax is the same either way.

What if Social Security made a mistake on my SSA-1099?

Contact Social Security directly at 1-800-772-1213 or visit your local office. Bring your records showing what you actually received. Social Security will issue a corrected SSA-1099 if there was an error. If you already filed your return, you can file an amended return (Form 1040-X) once you have the corrected form.