Whether you pay taxes on SSDI depends on your total income, not just what you receive from Social Security

You may owe federal income tax on your SSDI benefits if your combined income exceeds a certain threshold. Combined income means your adjusted gross income plus nontaxable interest plus half of your Social Security benefits. The threshold is $25,000 if you file as single, $32,000 if you file as married filing jointly, and $0 if you are married filing separately.

If your combined income stays below these thresholds, you owe no federal tax on your SSDI. If it goes above, you may owe tax on up to 85 percent of your benefits. This is not a flat tax on all your benefits—it is a calculation based on how much your income exceeds the threshold.

Some states also tax Social Security benefits, though most do not. The states that do are Colorado, Connecticut, Kansas, Minnesota, Missouri, Montana, Nebraska, New Mexico, Rhode Island, Utah, and Vermont. If you live in one of these states, check your state tax rules or contact your state revenue office, because state tax thresholds and rates differ from federal rules.

Key Takeaways

  • You only owe federal tax on SSDI if your combined income (wages, investments, and half your benefits) exceeds $25,000 single or $32,000 married filing jointly.
  • If you do owe tax, you pay it on up to 85 percent of your benefits, not on all of them.
  • Eleven states tax Social Security benefits under their own rules, which are separate from federal thresholds.
  • Social Security sends you a form SSA-1099 each January showing how much you received, which you use to calculate whether you owe tax.

How combined income is calculated

The IRS uses a specific formula to determine whether your benefits are taxable. Start with your adjusted gross income (the income you report on your tax return before deductions). Add any nontaxable interest you earned, such as interest from municipal bonds. Then add half of the Social Security benefits you received during the year. That total is your combined income.

This formula means that even if you have no wages or investment income, you can still have combined income if you received SSDI. For example, if you received $15,000 in SSDI and had $500 in nontaxable interest, your combined income would be $500 plus half of $15,000, which is $8,000—well below the $25,000 threshold for single filers.

Wages from work, interest and dividends, rental income, and self-employment income all count toward your adjusted gross income. Supplemental Security Income (SSI) does not count, because SSI is a separate program and is never taxable. If you receive both SSDI and SSI, only the SSDI portion affects your combined income calculation.

What happens if your income exceeds the threshold

If your combined income is above the threshold, you do not automatically owe tax on all your benefits. Instead, the IRS uses a two-step calculation to determine the taxable portion.

First, calculate the amount by which your combined income exceeds the threshold. If you are single and your combined income is $30,000, the excess is $5,000. Next, take the lesser of two amounts: either 50 percent of that excess, or 50 percent of your total benefits. That is the amount potentially subject to tax under the first tier.

If your combined income is very high, a second tier applies. If the excess over the threshold is more than $9,000 (single) or $12,000 (married filing jointly), you may owe tax on up to an additional 35 percent of your benefits. The maximum taxable portion is 85 percent of your total benefits, even if your income is very high.

This means that even high-income beneficiaries do not pay tax on more than 85 percent of what they received. The calculation is complex, which is why many people work with a tax professional or use tax software that handles the formula automatically.

Form SSA-1099 and reporting your benefits

Each January, Social Security mails you a Form SSA-1099 showing the total SSDI benefits you received in the previous year. You use this form to report your benefits on your federal tax return. The form shows the gross amount you received before any taxes were withheld.

If you had federal income tax withheld from your benefits, that withholding appears on the form as well. You report the gross amount on your tax return, not the net amount after withholding. The IRS then calculates whether any of your benefits are taxable based on your combined income.

Keep your SSA-1099 with your tax records. If you did not receive one by early February, contact Social Security at 1-800-772-1213 to request a replacement. You need this form to file your return accurately, even if you ultimately owe no tax on your benefits.

Withholding taxes from your SSDI payments

You can choose to have federal income tax withheld directly from your SSDI payments. This is optional—Social Security does not withhold automatically unless you request it. If you know you will owe tax, withholding can prevent a large bill when you file your return.

To set up withholding, complete Form W-4V (Voluntary Withholding Request) and submit it to Social Security. You can choose to withhold 10, 15, 25, or 35 percent of your monthly benefit. You can change or stop withholding at any time by submitting a new form.

Withholding is not a substitute for filing a tax return. Even if you have taxes withheld, you still must file a return if your income exceeds the filing threshold for your age and filing status. Withholding straightforward reduces the amount you owe when you file.

State taxes on Social Security benefits

Most states do not tax Social Security benefits at all. However, Colorado, Connecticut, Kansas, Minnesota, Missouri, Montana, Nebraska, New Mexico, Rhode Island, Utah, and Vermont do tax benefits under their own rules.

State tax rules are separate from federal rules. A state may tax your benefits even if the federal government does not, or vice versa. Some states use the same combined income thresholds as the federal government; others use different thresholds or tax all benefits above a certain age. A few states exempt benefits for people over a certain age or with income below a certain level.

If you live in one of these states, contact your state revenue office or consult a tax professional familiar with your state's rules. State tax forms and instructions are usually available on your state's revenue website.

Planning ahead if you have other income

If you work, receive investment income, or have other sources of income, you may want to plan ahead to minimize the tax on your benefits. Some strategies include timing the sale of investments to spread gains across years, contributing to tax-deferred retirement accounts if you are still working, or consulting a tax professional about your specific situation.

Keep in mind that certain income does not count toward the combined income threshold. For example, Supplemental Security Income (SSI), veterans benefits, and workers' compensation do not count. If you receive any of these, they do not push you over the threshold for SSDI taxation.

If your income fluctuates year to year, you may owe tax some years but not others. This is normal. Each year's tax obligation is calculated separately based on that year's combined income.

Frequently Asked Questions

Do I have to file a tax return if I only receive SSDI?

Only if your combined income exceeds the threshold for your filing status. If you have no other income and your combined income is below $25,000 (single) or $32,000 (married filing jointly), you do not have to file. However, if you had taxes withheld, you may want to file to get a refund.

What if I work part-time while receiving SSDI?

Your wages count as part of your adjusted gross income, which increases your combined income. This may push you over the threshold and make your benefits taxable. Some people find it helpful to work with a tax professional to understand the impact before the year ends.

Can I reduce my SSDI tax by donating to charity?

Charitable donations reduce your adjusted gross income only if you itemize deductions instead of taking the standard deduction. For most people, the standard deduction is larger, so itemizing does not help. Consult a tax professional about your specific situation.

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

Contact Social Security when ready at 1-800-772-1213 to report the error. Social Security can issue a corrected form. Keep the original form and the corrected form together when you file your return.

Do I owe tax if I receive both SSDI and SSI?

Only the SSDI portion is subject to tax. SSI is never taxable and does not count toward your combined income. Your SSA-1099 shows only SSDI, so use that amount in your tax calculation.