How the IRS Counts SSDI as Income

The IRS taxes SSDI using a formula that depends on your other income, not on the SSDI amount alone. You may owe federal income tax on part of your benefits even if SSDI is your only source of money. The formula is called combined income, and it determines what percentage of your benefits count as taxable income.

Combined income is calculated as: your adjusted gross income plus nontaxable interest plus half of your SSDI benefits. The IRS then applies two thresholds. If your combined income is below the first threshold, you owe no tax on SSDI. If it exceeds the first threshold, up to 50 percent of your benefits become taxable. If it exceeds the second threshold, up to 85 percent of your benefits become taxable.

The thresholds are fixed and do not change with inflation. For 2024, the first threshold is $25,000 for single filers and $32,000 for married couples filing jointly. The second threshold is $34,000 for single filers and $44,000 for married couples filing jointly. These amounts have remained the same since 1984.

Key Takeaways

  • You calculate tax on SSDI using combined income (your other income plus half your SSDI), not SSDI alone.
  • If combined income stays below $25,000 (single) or $32,000 (married filing jointly), you owe no federal tax on SSDI.
  • Between the first and second threshold, up to 50 percent of your benefits are taxable; above the second threshold, up to 85 percent are taxable.
  • State income tax on SSDI varies by state — some states tax it, most do not, and a few have special rules for disability recipients.
  • You can request that the Social Security Administration withhold taxes from your monthly payment to avoid a large bill at tax time.

Working Out Your Tax Liability Step by Step

Start by adding up all your income for the year: wages, self-employment income, interest, dividends, pensions, rental income, and any other sources except SSDI itself. This is your adjusted gross income (AGI). Then add any nontaxable interest you earned — usually from municipal bonds. Then add half of your total SSDI benefits for the year. That sum is your combined income.

Next, subtract the first threshold that applies to you. If you are single, subtract $25,000. If you are married filing jointly, subtract $32,000. If your combined income is $25,000 or less (single) or $32,000 or less (married filing jointly), stop here — you owe no tax on SSDI. If your combined income exceeds the threshold, the excess is your provisional excess.

Now take half of your provisional excess. This is the amount of SSDI that becomes taxable under the first threshold rule. But do not stop yet — you must also check the second threshold. Subtract the second threshold from your combined income. If the result is positive, multiply it by 0.85. This is the amount of SSDI that becomes taxable under the second threshold rule. Whichever amount is smaller — the result from the first threshold or the second threshold — is the amount of your SSDI that is taxable income.

Once you know how much SSDI is taxable, add that amount to your other income and calculate your federal income tax using the standard tax tables for your filing status and year.

Real Example: Single Filer with Part-Time Work

Suppose you are single, received $18,000 in SSDI for the year, and earned $12,000 in part-time wages. You had no other income. Your adjusted gross income is $12,000. Half your SSDI is $9,000. Your combined income is $12,000 plus $9,000 = $21,000.

The first threshold for single filers is $25,000. Your combined income of $21,000 is below that, so you owe no federal tax on your SSDI. You would owe tax only on the $12,000 in wages, calculated using the standard tax tables.

Now suppose you earned $18,000 in wages instead. Your combined income would be $18,000 plus $9,000 = $27,000. This exceeds the first threshold of $25,000 by $2,000. Half of $2,000 is $1,000. So $1,000 of your SSDI becomes taxable. You would owe tax on $18,000 in wages plus $1,000 in taxable SSDI = $19,000 total taxable income.

State Income Tax on SSDI

Most states do not tax SSDI at all. However, a handful of states do tax SSDI as ordinary income, and a few others tax it only in certain situations. The states that currently tax SSDI are Colorado, Connecticut, Kansas, Minnesota, Missouri, Montana, Nebraska, New Mexico, Rhode Island, Utah, and Vermont. The rules and thresholds in these states differ from federal rules and from each other.

Some states exempt SSDI from tax if your total income falls below a certain level, even though the federal government taxes it. Others tax SSDI the same way the federal government does. A few states have special rules for people over a certain age or with certain disabilities. You should check your state's tax authority website or contact a tax preparer familiar with your state's rules, because the rules change and vary widely.

If you live in a state that taxes SSDI, you will need to file a state income tax return even if you do not owe federal tax. The state will use its own thresholds and formulas, which may result in a different taxable amount than the federal calculation.

Withholding Taxes From Your SSDI Payment

You can ask the Social Security Administration to withhold federal income tax from your monthly SSDI payment. This is optional, but it can help you avoid owing a large amount at tax time. You request withholding by completing Form W-4V (Voluntary Withholding Request) and submitting it to your local Social Security office or mailing it to the address on the form.

On Form W-4V, you choose a withholding rate: 7 percent, 10 percent, 15 percent, or 25 percent of your monthly benefit. The Social Security Administration will withhold that percentage from each payment and send it to the IRS. You can change your withholding rate at any time by submitting a new Form W-4V, and you can stop withholding by submitting a new form that says so.

Withholding does not change how much tax you owe — it just spreads the payment across the year instead of requiring a lump sum at tax time. If you withhold too little, you will still owe when you file. If you withhold too much, you will receive a refund. The goal is to withhold enough that you break even or owe very little.

Reporting SSDI on Your Tax Return

You report SSDI on your federal tax return using Form 1040 and Schedule 1 (Additional Income and Adjustments to Income). The Social Security Administration sends you a Form SSA-1099 by January 31 each year, showing your total SSDI benefits for the previous year. You use this form to fill in the SSDI amount on your tax return.

On Schedule 1, you enter your total SSDI benefits in the line for Social Security benefits. Then, on the main Form 1040, you enter the taxable portion of your SSDI (the amount you calculated using the combined income formula) on the line for Social Security benefits. The difference between the total and the taxable amount is the nontaxable portion.

If you use tax software, the program will usually walk you through these lines and calculate the taxable amount for you if you enter your income and SSDI total. If you prepare your return by hand or work with a tax preparer, make sure they understand the combined income formula, because it is not intuitive and mistakes are common.

What Happens If You Do Not Report SSDI Income

SSDI is reported to the IRS by the Social Security Administration on Form SSA-1099. The IRS receives a copy of this form and can match it against your tax return. If you do not report the taxable portion of your SSDI on your return, the IRS will likely catch the discrepancy and send you a notice of underreported income.

You will then owe the unpaid tax, plus interest calculated from the original due date, plus penalties for underpayment. The penalty is usually 20 percent of the unpaid tax, though it can be higher if the underreporting is deemed fraudulent. If you cannot pay the full amount, you can set up a payment plan with the IRS, but interest and penalties will continue to accrue.

If you believe you made an honest mistake, you can file an amended return (Form 1040-X) to correct it. Filing an amended return voluntarily before the IRS contacts you may reduce or eliminate penalties, though you will still owe the tax and interest.

Frequently Asked Questions

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

Not necessarily. If your combined income is below the first threshold ($25,000 for single filers, $32,000 for married filing jointly), you owe no federal tax on SSDI and do not have to file a federal return. However, if you live in a state that taxes SSDI, you may have to file a state return even if you do not owe federal tax. Check your state's rules.

Can I reduce my taxable SSDI by claiming deductions?

No. The combined income formula does not allow you to subtract deductions. It uses your adjusted gross income, which is calculated before deductions. However, deductions do reduce your overall taxable income, which can lower your total tax bill even if they do not change the taxable portion of your SSDI.

What if I earned income from work and also received SSDI?

Your work income counts toward your combined income, which determines how much SSDI is taxable. If your combined income exceeds the first threshold, part of your SSDI becomes taxable. You owe tax on both your wages and the taxable portion of your SSDI. Some people in this situation find it helpful to request tax withholding from their SSDI payment to avoid a large bill at tax time.

Does the combined income formula change each year?

The thresholds ($25,000, $32,000, $34,000, and $44,000) have not changed since 1984 and are not adjusted for inflation. This means that more people's SSDI becomes taxable each year as their other income rises. Congress would have to pass new legislation to change these thresholds.

What if I think I calculated my taxable SSDI wrong?

You can use the IRS worksheet in Publication 915 (Social Security and Equivalent Railroad Retirement Benefits) to recalculate. If you still believe there is an error, you can file an amended return using Form 1040-X. If the IRS calculated it differently on a notice they sent you, you can respond to that notice or contact the IRS directly to discuss the discrepancy.