The amount of your SSDI that is taxable depends on your other income and filing status

Not all of your Social Security Disability Insurance (SSDI) payment is necessarily taxable. The federal government uses a formula based on your combined income — which includes your SSDI, wages, interest, dividends, and other earnings — to determine what portion, if any, gets taxed. For many people receiving SSDI, especially those with little or no other income, none of the payment is taxable at all.

The formula is the same one used for regular Social Security retirement benefits. It works in tiers: if your combined income stays below a certain threshold, you owe no tax on your SSDI. If it crosses that threshold, up to 50 percent of your benefits may be taxable. If it goes higher still, up to 85 percent may be taxable. The thresholds depend on whether you file as single, married filing jointly, or married filing separately.

The IRS sends you a Form SSA-1099-SM each January showing how much SSDI you received in the previous year. This form is what you use to calculate whether any of it is taxable when you file your tax return.

Key Takeaways

  • Your SSDI is only taxable if your combined income (SSDI plus all other income) exceeds a base amount that depends on your filing status.
  • For single filers, the base amount is $25,000; for married filing jointly, it is $32,000; for married filing separately, it is $0.
  • If your combined income exceeds the base amount, you calculate taxable SSDI using a two-step formula that the IRS provides on worksheets in the tax instruction booklet.
  • The Form SSA-1099-SM you receive in January shows your total SSDI for the year and is required to complete your tax return correctly.
  • Many people with SSDI pay no federal income tax because their combined income stays below the threshold.

How the IRS calculates which part of your SSDI is taxable

The IRS uses a two-step calculation. First, you add up your combined income: your SSDI, wages, self-employment income, interest, dividends, rental income, and certain other sources. You do not include some items, such as Supplemental Security Income (SSI) or certain veterans' benefits, but you do include almost everything else.

Next, you subtract the base amount for your filing status. If the result is zero or negative, none of your SSDI is taxable. If the result is positive, you move to the second step: you calculate how much of your SSDI falls into the taxable range. The IRS provides a worksheet in the instructions to Form 1040 (or whichever form you file) that walks through this calculation line by line.

The worksheet can feel complicated, but it is designed so that you do not have to understand the logic — you just follow the steps. Many tax software programs also calculate this automatically if you enter your SSDI amount and other income.

The income thresholds that determine whether you owe tax

Your filing status determines the threshold. If you are single, the base amount is $25,000. If you are married filing jointly, it is $32,000. If you are married filing separately, it is $0 — meaning that if you file separately and have any combined income at all, some of your SSDI may be taxable.

These thresholds have not changed since 1984. They are not adjusted for inflation each year, so over time, more people with SSDI have crossed into the taxable range even without a change in their actual standard of living.

If your combined income is below your threshold, you file your tax return but report $0 in taxable SSDI. If your combined income is above your threshold, you use the worksheet to determine the taxable amount.

What counts as income for the taxable SSDI calculation

The IRS counts almost all income sources toward your combined income total. This includes wages from a job, self-employment income, interest from a bank account, dividends from investments, rental income, and income from a pension or annuity. It also includes certain distributions from retirement accounts.

Some income does not count. Supplemental Security Income (SSI) is excluded. Veterans' benefits are excluded. Workers' compensation is excluded. Certain railroad retirement benefits are excluded. Gifts and inheritances do not count. Loans do not count. Refunds of taxes you paid do not count.

If you are unsure whether a particular source of income counts, the IRS worksheet instructions list the sources that do and do not explore. You can also contact the IRS directly or consult a tax professional.

How to report taxable SSDI on your tax return

You report your SSDI on Form 1040 (the main federal income tax form for individuals) or on Form 1040-SR if you are 65 or older. The form has a line for the total SSDI you received (from your Form SSA-1099-SM) and a line for the taxable portion (which you calculate using the worksheet).

You enter the taxable amount on the line labeled "Taxable social security benefits." This amount then flows into your total income for the year, which determines your tax bracket and how much you owe.

If you use tax software, you typically enter your SSDI amount and let the program calculate the taxable portion. If you file by hand, you use the worksheet in the Form 1040 instructions. If you work with a tax professional or accountant, they will do this calculation for you.

When you might owe estimated taxes on SSDI

If you have other income in addition to SSDI — such as wages from part-time work or interest from savings — and that income is not subject to withholding, you may need to make estimated tax payments throughout the year rather than waiting until April to pay what you owe.

Estimated taxes are quarterly payments you make directly to the IRS if you expect to owe more than a small amount when you file. The IRS provides a worksheet to calculate whether you need to make them. If you do, payments are due in April, June, September, and January.

SSDI itself does not have taxes withheld from it, so if your SSDI plus other income will result in a tax bill, you may want to set aside money throughout the year or make estimated payments. Alternatively, if you have wages from a job, you can ask your employer to withhold extra from your paycheck to cover the SSDI tax.

State income tax on SSDI

Most states do not tax SSDI at all, regardless of your income level. However, a few states do tax it under their own rules, which may differ from the federal calculation. The states that currently tax SSDI are Colorado, Connecticut, Kansas, Minnesota, Missouri, Montana, Nebraska, New Mexico, Rhode Island, Utah, and Vermont. Even in these states, the tax is often lower than the federal rate or applies only to higher-income recipients.

If you live in one of these states, check your state's tax instructions or contact your state tax authority to learn how much of your SSDI is taxable under state law. You may owe state tax even if you owe no federal tax, or vice versa.

Frequently Asked Questions

If I have no other income besides SSDI, do I have to file a tax return?

No. If SSDI is your only income and none of it is taxable (which is the case for most people with only SSDI), you do not have to file a federal income tax return. However, if you have other income — even a small amount of interest or wages — you may be required to file.

What if I made a mistake on a past tax return and reported the wrong amount of taxable SSDI?

You can file an amended return using Form 1040-X for any year within the past three years. The IRS will recalculate your tax and either send you a refund or bill you for what you owe. If you are unsure whether you made an error, a tax professional can review your past returns.

Can I reduce my taxable SSDI by making a charitable donation?

Charitable donations reduce your overall taxable income, which can indirectly reduce the amount of SSDI that becomes taxable. However, you must itemize deductions on your tax return rather than taking the standard deduction for this to help. For most people with SSDI, the standard deduction is larger, so itemizing does not save money.

Does working part-time while on SSDI affect how much of my SSDI is taxable?

Yes. Wages from part-time work count as income in the combined income calculation, which can push you over the threshold and make some of your SSDI taxable. However, SSDI itself has no earnings limit — you can work and still receive your full SSDI payment. The tax consequence is separate from your benefit amount.

If my SSDI is not taxable, do I still need to keep the Form SSA-1099-SM?

Yes. Keep it with your tax records for at least three years. Even if none of your SSDI is taxable, the form documents your income and is part of your tax file in case the IRS ever asks questions about your return.