The threshold depends on your filing status and other income

You must file a tax return on your SSDI benefits if your combined income exceeds a certain amount. Combined income means your SSDI plus any other income you received that year — wages, interest, pensions, or other benefits. The threshold is not the same for everyone; it depends on whether you file as single, married filing jointly, married filing separately, or head of household.

For 2024, if you are single and your combined income is more than $25,550, you must file. If you are married filing jointly, the threshold is $32,200. If you are married filing separately, it drops to $25. These numbers change each year, so check the IRS website or your Social Security statement for the current year's thresholds.

The reason the threshold exists is that up to 85 percent of your SSDI can be taxable income, depending on how much you earn overall. The IRS uses a formula that looks at your combined income to decide what portion of your benefit counts as taxable.

Key Takeaways

  • Combined income — SSDI plus all other income — determines whether you file taxes, not SSDI alone.
  • For 2024, single filers must file if combined income exceeds $25,550; married filing jointly must file if combined income exceeds $32,200.
  • Even if you are below the filing threshold, filing a return may reduce your tax burden or result in a refund.
  • The IRS uses a two-tier formula to calculate how much of your SSDI is taxable, and the amount depends on your total combined income.

How the IRS calculates taxable SSDI

The IRS does not tax all of your SSDI the same way. Instead, it uses a formula based on your combined income — which includes half of your SSDI plus all other income. If that combined income is below a certain "base amount," none of your SSDI is taxable. If it exceeds the base amount, up to 50 percent of the excess becomes taxable. If it exceeds a second, higher threshold, up to 85 percent of your SSDI can become taxable.

For single filers in 2024, the first base amount is $25,000 and the second is $34,000. For married filing jointly, the first is $32,000 and the second is $44,000. These amounts also change yearly. The formula is complex, which is why many people with SSDI use tax software or a tax preparer to calculate the correct amount.

Example: You are single and received $15,000 in SSDI and $12,000 in part-time wages. Your combined income is $12,000 plus half of $15,000 ($7,500), which equals $19,500. Since $19,500 is below the first base amount of $25,000, none of your SSDI is taxable. You would only owe tax on the $12,000 in wages.

When you should file even if you are below the threshold

Even if your combined income is below the filing threshold, you may want to file a tax return. If you had taxes withheld from wages or other income, filing lets you claim a refund. If you are below the threshold and had no withholding, you still might benefit from filing to claim the Earned Income Tax Credit (EITC) or other refundable credits.

Filing is also important if you received a notice from the IRS or if you plan to take out a loan or mortgage — lenders often ask for recent tax returns as proof of income. Some people file even when not required straightforward to have an official record of their income for that year.

What documents you need to file

To file taxes on SSDI, you will need your Social Security Statement (Form SSA-1099), which Social Security mails to you by January 31 each year. This form shows how much SSDI you received in the previous year. You will also need documentation of any other income — a W-2 from an employer, a 1099 from self-employment or interest, or statements from pensions or other sources.

Keep records of any medical expenses, work-related expenses, or other deductions you plan to claim. If you use a tax preparer or software, have these documents ready before you start. The IRS does not require you to attach the SSA-1099 to your return, but keep it with your records in case of an audit.

State taxes and SSDI

Federal tax rules and state tax rules are different. Some states do not tax SSDI at all, even if the federal government does. Other states tax SSDI the same way the IRS does. A few states have their own thresholds that differ from federal thresholds. Check your state's tax authority website or ask a tax preparer what your state requires.

If you live in a state that does not tax SSDI, you may still owe federal taxes on it. Filing state and federal returns are separate processes, and you may need to file one but not the other depending on your income and your state's rules.

What happens if you do not file when you should

If you owe taxes and do not file, the IRS can assess penalties and interest on the amount owed. The failure-to-file penalty is usually 5 percent of the unpaid tax for each month the return is late, up to 25 percent. Interest accrues daily on any unpaid balance. If the IRS believes you owe money, they may send you a notice and demand payment.

If you realize you missed a year, you can still file a late return. The IRS generally allows you to file back returns for up to three years to claim refunds, though you can file older returns if you owe money. Filing late is better than not filing at all, because it stops penalties from growing and may result in a refund if you had withholding or credits.

Using tax software or a preparer

Many free tax software programs can walk you through the SSDI calculation. The IRS Free File program offers free federal return preparation if your income is below a certain level (usually around $60,000). State filing may have separate free options depending on where you live.

If you prefer to work with a person, a tax preparer or CPA can file your return for you. Some nonprofits and senior centers offer free tax preparation for people with low to moderate income. Ask your local Area Agency on Aging or a disability services organization whether they know of free tax help in your area.

Frequently Asked Questions

Do I have to file taxes if I only receive SSDI and no other income?

No. If SSDI is your only income, your combined income is half your SSDI, which is almost always below the filing threshold. You do not have to file unless you want to claim a refund or credit.

What if I worked part of the year and received SSDI the rest?

Your combined income includes both the wages and half your SSDI. If the total exceeds the threshold for your filing status, you must file. Use your W-2 and SSA-1099 to calculate combined income.

Can I amend a return I already filed if I made a mistake with SSDI?

Yes. File Form 1040-X (Amended U.S. Individual Income Tax Return) with the IRS. You have three years from the original filing date to claim a refund, though you can file an amended return after that if you owe additional tax.

Will filing taxes on SSDI affect my benefits?

Filing a tax return does not change your SSDI benefit amount. However, if you are working and earning wages, those wages can affect your benefit under the earnings test. Consult Social Security directly if you work and want to know how earnings affect your specific benefit.

Where do I find the current year's filing thresholds?

The IRS publishes updated thresholds each year on irs.gov. You can also call Social Security at 1-800-772-1213 or check your annual SSA-1099 statement, which sometimes includes threshold information for that year.