SSDI money may or may not be taxable, depending on your other income

Whether you owe federal income tax on your SSDI payments depends on how much other income you have. The Social Security Administration uses a formula called "combined income" to decide this. If your combined income stays below a certain threshold, your SSDI is not taxable. If it goes above that threshold, up to 50 percent or 85 percent of your SSDI becomes taxable income on your federal return.

The threshold amounts are the same for everyone: $25,000 if you file as single, head of household, or may have access to widow(er), and $32,000 if you file as married filing jointly. These thresholds have not changed since 1984, even though the cost of living has risen significantly. This means more people with SSDI reach the taxable threshold each year.

Your state may also tax SSDI, though most states do not. A handful of states—Colorado, Connecticut, Kansas, Minnesota, Missouri, Montana, Nebraska, New Mexico, Rhode Island, Utah, and Vermont—tax SSDI under certain conditions. If you live in one of these states, contact your state tax authority to find out whether you owe state income tax on your SSDI.

Key Takeaways

  • Combined income is the formula Social Security uses: it includes your SSDI, plus half your SSDI, plus all other income like wages, interest, and pensions.
  • If your combined income is below $25,000 (single) or $32,000 (married filing jointly), you owe no federal tax on your SSDI.
  • If your combined income exceeds the threshold, you may owe federal tax on up to 50 percent or 85 percent of your SSDI, depending on how far above the threshold you are.
  • Most states do not tax SSDI, but eleven states tax it under certain conditions; check with your state revenue department if you live in one of those states.
  • Social Security sends you a Form SSA-1099-SM each January showing how much SSDI you received; you use this to calculate your taxable amount.

How Social Security calculates combined income

Combined income is not the same as your total income. Social Security adds three things together: your SSDI payments, half of your SSDI payments, and all your other income. That third category includes wages from work, interest and dividends from savings or investments, rental income, pensions, distributions from retirement accounts, and income from self-employment.

The formula looks like this: (SSDI ÷ 2) + SSDI + other income = combined income. For example, if you received $15,000 in SSDI and had $12,000 in wages from part-time work, your combined income would be $27,000: ($15,000 ÷ 2) + $15,000 + $12,000. That puts you $2,000 over the $25,000 single threshold, which means some of your SSDI becomes taxable.

Income that does not count toward combined income includes Supplemental Security Income (SSI), workers' compensation, certain veterans' benefits, and some other government payments. If you receive SSI in addition to SSDI, only the SSDI counts in this calculation.

When up to 50 percent of your SSDI becomes taxable

If your combined income is between the threshold and the threshold plus $9,000 (single) or $12,000 (married), up to 50 percent of your SSDI becomes taxable. This is the lower tier of taxation.

To calculate the taxable amount, Social Security uses a specific formula. You take the amount by which your combined income exceeds the threshold, multiply it by 0.5, and compare it to half your SSDI. Whichever is smaller is the amount that becomes taxable. Using the earlier example: your combined income was $27,000, which is $2,000 over the threshold. Multiply $2,000 by 0.5, which equals $1,000. Half your SSDI is $7,500. Since $1,000 is smaller, $1,000 of your SSDI becomes taxable income.

When up to 85 percent of your SSDI becomes taxable

If your combined income exceeds the threshold by more than $9,000 (single) or $12,000 (married), you enter the higher tier. Here, up to 85 percent of your SSDI can become taxable. This applies to people with substantial other income—typically those who continue working while receiving SSDI, or those with significant investment or pension income.

The calculation is more complex at this tier because Social Security applies two separate formulas and adds the results. The first formula covers the first $9,000 (or $12,000 for married filers) above the threshold; the second covers the amount above that. Most people in this tier end up with between 50 and 85 percent of their SSDI taxable, not the full 85 percent. The IRS worksheet for Form 1040 walks through this step by step.

The Form SSA-1099-SM you receive each year

In January, Social Security mails you a Form SSA-1099-SM for the previous tax year. This form shows the total SSDI you received and is the official record you need to file your federal tax return. You will receive one form for each person in your household who receives SSDI—if you and your spouse both receive SSDI, you each get your own form.

The form does not calculate your taxable amount; it only reports what you received. You or your tax preparer use this form along with your other income documents (W-2s, 1099s for interest or dividends, and so on) to fill out the IRS worksheet and determine whether any of your SSDI is taxable. If you file electronically, you can enter the information from the SSA-1099-SM directly into tax software.

Keep your SSA-1099-SM with your tax records. If Social Security sends you a corrected form (called a corrected 1099-SM), use that instead and file an amended return if you have already filed.

What to do if you think you owe tax on your SSDI

If your combined income puts you over the threshold, you have two options: pay the tax when you file your return, or request that Social Security withhold taxes from your SSDI payments throughout the year. Withholding spreads the tax bill across twelve months instead of paying it all at once when you file.

To request withholding, fill out Form W-4V and send it to your local Social Security office. You can choose to have 7, 10, 12, or 22 percent of your SSDI withheld. Many people choose this route because it prevents a large tax bill in April and reduces the chance of underpaying and owing a penalty.

If you do not withhold and you owe a significant amount, you may also owe estimated tax penalties. The IRS charges a penalty if you underpay your taxes by more than a certain amount during the year. Filing your return on time and paying what you owe stops the penalty from growing, but you cannot avoid it retroactively.

State taxes on SSDI

Eleven states tax SSDI under certain conditions. Colorado, Connecticut, Kansas, Minnesota, Missouri, Montana, Nebraska, New Mexico, Rhode Island, Utah, and Vermont all have state income taxes that may explore to SSDI. The rules vary by state—some tax SSDI only if your income exceeds a certain threshold, others only if you are under a certain age, and some explore different percentages than the federal government.

If you live in one of these states and your combined income is high enough to make your SSDI federally taxable, assume it is also state taxable unless you research your state's specific rules. Contact your state's revenue or taxation department directly; they can tell you whether you owe state tax and what form to file. Do not rely on tax software alone, because state rules are often different from federal rules and software may not account for your state's specific SSDI treatment.

Frequently Asked Questions

Does working part-time while on SSDI make my SSDI taxable?

Not automatically. Your SSDI becomes taxable only if your combined income (SSDI plus half of SSDI plus your wages) exceeds $25,000 (single) or $32,000 (married). If you earn $8,000 in wages and receive $15,000 in SSDI, your combined income is $27,500, which puts you $2,500 over the threshold. In that case, some of your SSDI becomes taxable. If your wages are lower, you may stay under the threshold.

If I have no other income, do I owe tax on my SSDI?

No. If SSDI is your only income, your combined income equals your SSDI amount plus half your SSDI. For example, $15,000 in SSDI alone creates a combined income of $22,500, which is below the $25,000 threshold. You owe no federal tax on your SSDI. This is true even if you receive a large amount of SSDI.

Can I reduce my taxable SSDI by lowering my other income?

Yes, in some cases. If you are close to the threshold, reducing other income—such as by delaying a pension payment or limiting investment sales—can keep your combined income below the threshold and make your SSDI nontaxable. However, this strategy only works if you have control over when you receive that income. Wages from employment are harder to control, and some income (like required minimum distributions from retirement accounts) cannot be delayed.

What if I disagree with the taxable amount Social Security calculated?

Social Security does not calculate your taxable amount; the IRS does, using the formula on the tax return worksheet. If you believe the amount is wrong, review the IRS worksheet line by line or have a tax professional review it. If you find an error, file an amended return (Form 1040-X) with the IRS, not with Social Security.

Do I have to file a tax return if my only income is SSDI?

Not necessarily. If SSDI is your only income and the amount is below the filing threshold for your age and filing status, you are not required to file. However, if you had taxes withheld from your SSDI, you should file to get a refund. Check the IRS website or ask a tax professional whether you are required to file based on your specific situation.