The percentage of SSDI that is taxable depends on your total income, not on the benefit amount itself

The Social Security Administration does not tax SSDI at a flat rate. Instead, the Internal Revenue Service uses a formula based on your "combined income" — which includes your SSDI, other earnings, and certain non-taxable income — to decide whether any of your benefit is taxable and how much.

If your combined income is below a threshold, none of your SSDI is taxable. If it exceeds that threshold, up to 50% or 85% of your benefit may be taxable, depending on how far above the threshold you go. This means two people receiving the same SSDI payment can owe very different amounts in tax, or one might owe nothing at all.

The thresholds are set by federal law and do not change with inflation. For 2024, the base thresholds are $25,000 for single filers and $32,000 for married filing jointly. These figures have remained the same since 1984.

Key Takeaways

  • Your SSDI is taxable only if your combined income exceeds $25,000 (single) or $32,000 (married filing jointly), and the percentage taxed rises as income increases.
  • Combined income includes your SSDI, wages, self-employment income, interest, dividends, and certain non-taxable items like municipal bond interest.
  • At most, 85% of your SSDI can be taxed in a single year, even if your combined income is very high.
  • You may owe federal income tax on SSDI even if you do not file a tax return, and state income tax rules vary by location.

How combined income is calculated

Combined income is the sum of your adjusted gross income (AGI) plus nontaxable interest plus half of your SSDI benefit. This is the number the IRS uses to determine whether any of your SSDI is taxable.

If you have wages from work, self-employment income, rental income, capital gains, or taxable interest, all of those count toward combined income. If you receive a pension, that counts too. Nontaxable items that still count include municipal bond interest and certain foreign income.

The key point: you do not have to earn money from work for SSDI to become taxable. If you have any other income source — even a small amount of interest from a savings account — it pushes your combined income higher and can trigger taxation of your benefit.

The two-tier tax formula

The IRS applies a two-step calculation. First, it determines whether your combined income exceeds the base threshold ($25,000 single, $32,000 married filing jointly). If it does not, your SSDI is not taxable, and you stop there.

If your combined income exceeds the base threshold, the IRS calculates the amount over the threshold. Up to 50% of that excess amount, or up to 50% of your total SSDI benefit (whichever is less), becomes taxable. This is the first tier.

If your combined income exceeds a second, higher threshold ($34,000 single, $44,000 married filing jointly), the calculation becomes more complex. The IRS adds 85% of the amount over the second threshold to the amount already taxable from the first tier. However, the total taxable SSDI cannot exceed 85% of your benefit.

Example: A single filer with $30,000 in combined income has $5,000 over the first threshold. Half of that ($2,500) becomes taxable, up to a maximum of 50% of the SSDI benefit. If the SSDI benefit is $1,500 per month ($18,000 per year), then $900 of it is taxable (50% of $18,000). If the benefit is $4,000 per month ($48,000 per year), then $2,500 is taxable (the lesser of $2,500 or 50% of $48,000).

Why state taxes matter

Federal income tax is not the only tax that can explore to SSDI. Some states tax SSDI as income, and others do not. The rules vary widely and change periodically.

As of 2024, states including Colorado, Connecticut, Kansas, Minnesota, Missouri, Montana, Nebraska, New Mexico, Rhode Island, Utah, and Vermont tax SSDI under certain conditions. Most of these states exempt SSDI for residents over a certain age (often 59 or 62) or below a certain income level. A few states tax SSDI the same way the federal government does; others use their own thresholds.

If you live in a state that taxes SSDI, you will need to file a state return even if you do not owe federal tax. Contact your state tax authority or a tax preparer familiar with your state's rules to understand your specific situation.

What happens if you do not file a tax return

If you owe federal income tax on SSDI, you are required to file a tax return, even if no one withholds tax from your benefit. The Social Security Administration does not automatically withhold federal income tax from SSDI payments the way employers do from wages.

If you do not file and you owe tax, the IRS can assess penalties and interest. You may also lose the ability to claim tax credits you are may have access to to, such as the Earned Income Tax Credit or the Saver's Credit.

You can request that the Social Security Administration withhold federal income tax from your SSDI payment if you want to. Complete Form W-4V (Voluntary Withholding Request) and submit it to your local Social Security office. You can choose to have 10%, 15%, 25%, or 35% of your benefit withheld each month.

How work affects SSDI taxation

If you work while receiving SSDI, your wages count toward combined income, which can push more of your SSDI into taxable territory. However, SSDI has separate work incentive rules that allow you to earn money without losing your benefit entirely.

Under the Substantial Gainful Activity (SGA) threshold, you can earn up to a certain amount per month without triggering a benefit suspension. For 2024, the SGA threshold is $1,550 per month for non-blind beneficiaries and $2,590 for blind beneficiaries. These amounts change annually.

Even if you stay under SGA, your earnings still count as income for tax purposes. If you earn $15,000 in a year and receive $18,000 in SSDI, your combined income (before adding nontaxable interest and half your SSDI) is $33,000, which exceeds the first threshold and triggers taxation of your benefit.

Frequently Asked Questions

Can I reduce the amount of SSDI that is taxed by earning less money?

Yes. If your combined income is below $25,000 (single) or $32,000 (married filing jointly), none of your SSDI is taxable. Reducing other income sources — such as by withdrawing less from a retirement account or delaying the start of a pension — can lower your combined income below the threshold and eliminate SSDI taxation entirely.

Does the SSDI tax threshold increase each year?

No. The thresholds ($25,000 and $34,000 for single filers, $32,000 and $44,000 for married filing jointly) have been fixed by law since 1984 and do not adjust for inflation. This means more beneficiaries fall into taxable territory each year as their other income sources grow.

If I am married filing separately, how does SSDI taxation work?

Married couples filing separately face a much stricter rule: if you are married and file separately, and you lived with your spouse at any time during the year, your SSDI is taxable if your combined income exceeds $0. This effectively means all your SSDI is taxable. Filing jointly is almost always more favorable for SSDI beneficiaries who are married.

What if I receive both SSDI and SSA retirement benefits?

Both benefits count toward your combined income for tax purposes. The IRS treats them the same way: the combined income threshold applies to the total of both benefits, and up to 85% of the combined total can be taxed. You will need to report both on your tax return.

Do I have to pay estimated tax on SSDI?

If you owe a large amount of tax on SSDI and do not have tax withheld, the IRS may require you to pay estimated tax quarterly. If you owe less than $1,000 in tax for the year, you generally do not have to pay estimated tax. A tax preparer can tell you whether you fall into this category based on your specific income and withholding.