SSDI is taxable only if your total income exceeds a threshold, and only a portion of your benefits are taxed

Social Security Disability Insurance (SSDI) benefits are not automatically taxable. You owe federal income tax on your SSDI only if your combined income exceeds $25,000 (single filer) or $32,000 (married filing jointly). Combined income means your adjusted gross income plus nontaxable interest plus half your SSDI benefits. If you stay below that threshold, you owe nothing on your SSDI, even if you have other income.

If you do cross the threshold, you do not pay tax on all your SSDI. Instead, you pay tax on the lesser of two amounts: either 50% of the amount over the threshold, or 85% of your total SSDI benefits. In practice, most people who owe tax on SSDI pay tax on roughly 50% of their benefits. The actual percentage depends on how far over the threshold you are and what other income you have.

These thresholds have not changed since 1984. They are not adjusted for inflation, which means more beneficiaries cross them each year as wages and other income rise.

Key Takeaways

  • SSDI is only taxable if your combined income (adjusted gross income plus nontaxable interest plus half your SSDI) exceeds $25,000 single or $32,000 married filing jointly.
  • If you are below the threshold, you owe no federal tax on your SSDI, regardless of how much SSDI you receive or what other income you have.
  • If you are above the threshold, you pay tax on the lesser of 50% of the excess or 85% of your total SSDI — usually about 50% of your benefits.
  • Some states also tax SSDI, but most do not; check your state's rules if you live in Colorado, Connecticut, Kansas, Minnesota, Missouri, Montana, Nebraska, New Mexico, Rhode Island, Utah, or Vermont.

How combined income is calculated for SSDI tax purposes

The IRS uses a specific definition of combined income to determine whether your SSDI is taxable. It is not the same as your adjusted gross income (AGI) alone. Combined income = your AGI + nontaxable interest + half your SSDI benefits.

Nontaxable interest includes interest from municipal bonds and certain other tax-exempt securities. If you have no nontaxable interest, you skip that part. The half-SSDI part is always included in the calculation, even if you ultimately owe no tax on your SSDI.

Your AGI includes wages, self-employment income, taxable pensions, taxable Social Security retirement benefits, capital gains, rental income, and most other income sources. It does not include Supplemental Security Income (SSI), which is a different program and is never taxable. It also does not include certain work incentive payments if you are using a Plan to Achieve Self-Support (PASS) or Impairment Related Work Expenses (IRWE).

Example: You receive $1,200 per month in SSDI ($14,400 per year). You have a part-time job paying $15,000 per year. You have no nontaxable interest. Your combined income is $15,000 + $0 + ($14,400 ÷ 2) = $22,200. You are below $25,000, so none of your SSDI is taxable.

The two-tier formula when you exceed the threshold

If your combined income exceeds the threshold, the IRS applies a two-tier calculation to determine how much of your SSDI is taxable. You calculate the tax under both tiers and pay tax on whichever amount is smaller.

Tier 1: Take the amount by which your combined income exceeds the threshold. Multiply that by 50%. This is your taxable SSDI under Tier 1.

Tier 2: If your combined income exceeds $34,000 (single) or $44,000 (married), you may owe tax under Tier 2 as well. Tier 2 taxable SSDI = 85% of the excess over the second threshold, plus the lesser of (a) 50% of the excess over the first threshold or (b) $4,500 (single) or $6,000 (married).

In most cases, Tier 1 produces the smaller number, so you pay tax on roughly 50% of your SSDI. Tier 2 applies only if you have substantial other income.

Example: You receive $18,000 per year in SSDI. You have $30,000 in wages and no nontaxable interest. Combined income = $30,000 + $0 + $9,000 = $39,000. You exceed the $25,000 threshold by $14,000. Tier 1: $14,000 × 50% = $7,000 taxable SSDI. You also exceed the $34,000 second threshold by $5,000, so Tier 2 applies: 85% × $5,000 = $4,250, plus the lesser of 50% × $14,000 ($7,000) or $4,500 ($4,500) = $4,250 + $4,500 = $8,750. You pay tax on the lesser amount: $7,000.

State income tax on SSDI

Most states do not tax SSDI benefits. However, 11 states do: Colorado, Connecticut, Kansas, Minnesota, Missouri, Montana, Nebraska, New Mexico, Rhode Island, Utah, and Vermont. Each state uses its own rules, which may differ from federal rules.

Some states follow the federal threshold system. Others tax SSDI as ordinary income without a threshold. Some states exempt SSDI for beneficiaries below a certain age or income level. If you live in one of these states, contact your state tax authority or a tax professional to understand your state's rules.

If you live in a state that taxes SSDI and you owe state tax, you will typically report the same amount of taxable SSDI on your state return as you do on your federal return, unless your state has different rules. A few states allow a deduction or credit for SSDI taxes paid.

How to report SSDI on your tax return

The Social Security Administration sends you a Form SSA-1099-SM (Social Security Benefit Statement) each January showing the total SSDI you received in the prior year. You use this form to calculate your taxable SSDI and report it on your federal tax return.

You report the total SSDI from Box 5 of the SSA-1099-SM on Form 1040, line 5b (or the equivalent line on your return form). You then calculate how much is taxable using the combined income formula and the two-tier rules. The taxable portion goes on line 5b as well, with the nontaxable portion subtracted.

If you use tax software, it will walk you through the combined income calculation. If you file by hand or with a tax professional, make sure they understand the SSDI rules, because they differ from the rules for Social Security retirement benefits.

You do not have to file a tax return at all if your income is below the standard deduction for your filing status. However, if you have taxes withheld from other income (like wages), you may want to file to get a refund.

Withholding and estimated tax payments

The Social Security Administration does not automatically withhold federal income tax from SSDI payments. You can request withholding by filing Form W-4V (Voluntary Withholding Request) with Social Security. If you request withholding, Social Security will withhold 10%, 12%, 22%, or 24% of your monthly benefit, depending on what you choose.

Withholding is optional. Many beneficiaries choose to withhold if they know they will owe tax, because it spreads the payment across the year rather than requiring a lump sum at tax time. Others prefer not to withhold and instead pay estimated tax quarterly using Form 1040-ES.

If you have other income (like wages or self-employment income) and your employer or business already withholds tax, you may not need additional withholding from SSDI. Calculate your total expected tax for the year and compare it to your expected withholding from all sources.

SSDI and Medicare premiums

Your SSDI income affects your Medicare Part B and Part D premiums if your modified adjusted gross income (MAGI) exceeds certain thresholds. MAGI for Medicare purposes is calculated differently than combined income for tax purposes: it is your AGI plus nontaxable interest plus half your SSDI, just like the tax calculation, but the thresholds are different.

If your MAGI exceeds $97,000 (single) or $194,000 (married filing jointly) in 2024, you pay a higher Part B premium. If it exceeds $123,000 (single) or $246,000 (married), you pay a higher Part D premium. These thresholds are adjusted annually for inflation. The income used is from two years prior to the current year.

This is separate from income tax. You could owe higher Medicare premiums even if you owe no income tax on your SSDI, or vice versa.

Frequently Asked Questions

If I am below the threshold, do I have to file a tax return?

No, not unless your total income (including SSDI) exceeds the standard deduction for your filing status. However, if you have taxes withheld from other income, you may want to file to get a refund. Check the IRS website for the current standard deduction amounts.

Does SSI count toward the SSDI tax threshold?

No. Supplemental Security Income (SSI) is never taxable and does not count as income for the SSDI tax threshold calculation. SSDI and SSI are separate programs with different rules.

If I work and use a PASS plan, does that income count toward the threshold?

Income set aside under a Plan to Achieve Self-Support (PASS) is excluded from your AGI, so it does not count toward the combined income threshold. However, you must have an approved PASS plan on file with Social Security for this exclusion to explore.

Can I reduce my taxable SSDI by making charitable donations?

Charitable donations reduce your AGI, which in turn reduces your combined income and may lower your taxable SSDI. However, you can only deduct charitable donations if you itemize deductions rather than taking the standard deduction. For most SSDI beneficiaries, the standard deduction is larger, so itemizing does not help.

What if I disagree with the amount of SSDI shown on my SSA-1099-SM?

Contact Social Security directly to verify the amount. If Social Security made an error, they will issue a corrected form. Do not file your tax return until you have the correct amount, because reporting the wrong SSDI could trigger an audit.