The IRS taxes SSDI the same way it taxes retirement Social Security — but only if your total income crosses a threshold

Whether you owe federal income tax on your SSDI payments depends on your combined income, not on SSDI alone. Combined income is your adjusted gross income plus nontaxable interest plus half your Social Security benefits. If that number stays below a certain level, you pay no tax on SSDI. If it goes above that level, you may owe tax on up to 85 percent of your benefits.

The threshold is the same for SSDI and retirement Social Security: $25,000 for single filers, $32,000 for married filing jointly, and $0 for married filing separately. These thresholds have not changed since 1984 and do not adjust for inflation, which means more people cross them each year as wages and other income rise.

The tax applies only to federal income tax, not to Social Security tax itself. You do not pay Social Security or Medicare tax on SSDI payments once you receive them. The tax is calculated on your annual tax return using IRS Form 1040 and Worksheet 1 or Worksheet 2 (depending on your situation), not through withholding from your monthly check.

Key Takeaways

  • SSDI becomes taxable only when your combined income — wages, pensions, interest, and half your benefits — exceeds $25,000 (single) or $32,000 (married filing jointly).
  • If you cross the threshold, you may owe tax on 50 to 85 percent of your benefits, depending on how far above the threshold your income reaches.
  • The IRS does not withhold tax from SSDI payments automatically; you calculate the tax owed on your annual Form 1040 return.
  • You can request voluntary withholding from your SSDI check if you expect to owe tax, using Form W-4V submitted to Social Security.

How the IRS calculates the taxable portion of SSDI

The calculation has two tiers. In the first tier, if your combined income exceeds the threshold by any amount up to $9,000 (single) or $12,000 (married filing jointly), you may owe tax on up to 50 percent of your benefits. In the second tier, if your combined income exceeds the first threshold by more than those amounts, you may owe tax on up to 85 percent of your benefits.

The actual amount taxed is the lesser of two calculations: either the amount your combined income exceeds the threshold, or the maximum percentage of benefits (50 or 85 percent) that applies to your situation. This means high-income filers do not pay tax on more than 85 percent of their benefits, even if their income is very high.

Example: A single filer with $30,000 in combined income and $15,000 in SSDI benefits has combined income $5,000 above the $25,000 threshold. The first-tier calculation allows up to 50 percent of benefits ($7,500) to be taxed. Since the excess income ($5,000) is less than the maximum taxable amount ($7,500), the filer owes tax on $5,000 of SSDI.

What counts as income for the combined income calculation

Combined income includes wages, self-employment income, pensions, annuities, capital gains, dividends, interest, and rental income. It also includes tax-exempt interest from municipal bonds, which most people do not expect to count. Half of your Social Security or SSDI benefits are added to this total.

Some income does not count: Supplemental Security Income (SSI) is excluded, as are certain veterans' benefits and some railroad retirement benefits. Gifts and inheritances do not count. Loans do not count, even if you later repay them from income.

If you are married filing jointly, you combine your income with your spouse's income for the threshold calculation, even if only one of you receives SSDI. If your spouse has substantial income and you have little, you may owe tax on your SSDI even though your own income is low.

When you should request voluntary withholding

The IRS does not automatically withhold tax from SSDI checks. If you know you will owe tax when you file your return, you can ask Social Security to withhold a percentage of your monthly payment. This prevents a large tax bill at filing time and may reduce or eliminate the need to make quarterly estimated tax payments.

To request withholding, complete Form W-4V (Voluntary Withholding Request) and submit it to your local Social Security office or mail it to the address on the form. You can request withholding of 7, 10, 15, or 22 percent of your monthly benefit. The withholding begins the month after Social Security receives your form.

You can change or stop withholding at any time by submitting a new Form W-4V. If you have other income sources with withholding (such as wages or a pension), coordinate the total withholding across all sources to avoid both underpayment penalties and overpayment refunds.

State income tax on SSDI

Most states do not tax SSDI benefits, but a few do. The states that tax SSDI are Colorado, Connecticut, Kansas, Minnesota, Missouri, Montana, Nebraska, New Mexico, Rhode Island, Utah, and Vermont. The rules vary by state: some follow the federal threshold, some use a lower threshold, and some tax SSDI only if your total income is above a certain level.

If you live in a state that taxes SSDI, contact your state tax authority or a tax preparer familiar with your state's rules. State withholding is separate from federal withholding and requires a different form or process.

If you move to a different state during the year, you may owe tax to both states depending on when you moved and your state's residency rules. This is especially important if you move from a state that does not tax SSDI to one that does.

Reporting SSDI on your tax return

Social Security sends you a Form SSA-1099 each January showing the total SSDI you received in the prior year. Use this form to report your benefits on your federal tax return. If you received benefits from both SSDI and retirement Social Security, you receive one Form SSA-1099 showing the combined total.

Enter the total from Box 5 of Form SSA-1099 on line 5b of Form 1040. Then use Worksheet 1 or Worksheet 2 (included in the Form 1040 instructions) to calculate how much of your benefits are taxable. The taxable portion goes on line 5b as well, and the nontaxable portion is subtracted.

If you did not receive a Form SSA-1099 by early February, contact Social Security at 1-800-772-1213 to request a replacement. Do not estimate the amount; use the official form.

What happens if you do not report SSDI income

SSDI income is reported to the IRS by Social Security, so the IRS knows the amount you received. If you do not report it on your return and you owe tax, the IRS will send you a notice of tax due, plus penalties and interest. The penalty for not reporting income is typically 20 percent of the underpaid tax, plus interest that compounds daily.

If you cannot pay the tax owed, you can request a payment plan from the IRS. Short-term plans (120 days or less) are free; long-term installment agreements have a setup fee and monthly payment fee. You can also request an offer in compromise if you cannot pay the full amount, though these are rarely accepted.

Frequently Asked Questions

If I have very little income besides SSDI, do I still have to file a tax return?

No, not if your combined income is below the filing threshold set by the IRS for your age and filing status. For 2024, a single person under 65 with only SSDI income does not have to file unless combined income exceeds $14,600. However, if you had taxes withheld from your SSDI, you should file to get a refund.

Can I reduce my SSDI tax by earning less income?

Yes. If you have control over your income — for example, you work part-time or have investment income you can defer — reducing income below the threshold eliminates SSDI tax entirely. However, if your income is from a pension or annuity, you cannot easily reduce it without affecting your retirement security.

Does SSDI count as income for Medicare premiums?

Yes. SSDI is counted as income when calculating your Medicare Part B and Part D premiums. Higher income can result in higher premiums through Income-Related Monthly Adjustment Amounts (IRMAA). The income thresholds for IRMAA are different from the thresholds for SSDI taxation.

What if I received SSDI for only part of the year?

The Form SSA-1099 shows only the months you received benefits. Use that amount on your tax return. If you started or stopped SSDI mid-year, your combined income calculation includes only the income you actually received during the months you were on SSDI.

Do I need to pay quarterly estimated taxes on SSDI?

Only if you have other income that is not subject to withholding and you expect to owe more than $1,000 in tax for the year. If you request voluntary withholding on your SSDI check and have adequate withholding from other sources, you typically do not need to make quarterly payments.