Montana does not tax SSDI benefits at the state level

Montana is one of the states that does not impose a state income tax on Social Security Disability Insurance (SSDI) benefits. This means that no matter how much SSDI you receive, you will not owe Montana state income tax on those payments. However, you may still owe federal income tax on a portion of your benefits, depending on your total income for the year.

The federal government uses a formula called "combined income" to determine whether your SSDI is taxable at the federal level. Combined income includes your SSDI, plus any other income you have, plus half of your SSDI amount. If your combined income exceeds certain thresholds, you may have to report and pay tax on up to 85 percent of your benefits to the IRS. Montana's lack of a state income tax does not change this federal calculation.

Key Takeaways

  • Montana does not tax SSDI benefits under state income tax law, so you owe no state tax on your disability payments.
  • Federal income tax on SSDI is determined by your combined income (SSDI plus other income plus half your SSDI), not by where you live.
  • If your combined income exceeds $25,000 (single filer) or $32,000 (married filing jointly), you may owe federal tax on a portion of your SSDI.
  • You must file a federal tax return with the IRS even if you live in Montana and owe no state tax, if your income meets the filing threshold.
  • Work incentives and other income sources count toward your combined income threshold, so you should track all earnings and benefits.

How Montana's lack of state income tax affects your SSDI

Because Montana has no state income tax, you will not file a Montana state income tax return or owe any state tax on your SSDI, wages, investment income, or other sources. This is a straightforward advantage if you live in Montana and receive SSDI. You do not need to set aside money for Montana state taxes on your disability payments.

However, this does not mean you are free from all tax obligations. The federal government still taxes SSDI under its own rules, which explore to all recipients regardless of state. You must still determine whether you owe federal income tax and, if so, file a federal return with the IRS. Montana's tax-free status only covers state-level taxes.

Federal SSDI taxation and the combined income threshold

The IRS uses a specific formula to decide whether your SSDI is taxable. First, calculate your combined income: take your SSDI amount, add all other income (wages, pensions, interest, dividends, rental income), and add half of your SSDI. If the result is below $25,000 (for single filers) or $32,000 (for married couples filing jointly), none of your SSDI is taxable.

If your combined income exceeds those thresholds, you may owe federal tax on up to 50 percent of your benefits (if your combined income is between $25,000 and $34,000 for single filers, or $32,000 and $44,000 for married filers) or up to 85 percent of your benefits (if your combined income is above those upper limits). The exact amount depends on how far over the threshold you go. This calculation is the same whether you live in Montana, California, or any other state.

Work incentives and other income that count toward your threshold

If you are working while receiving SSDI, your wages count toward your combined income threshold. This means that even though Montana has no state income tax, your earnings will push your combined income higher and may trigger federal SSDI taxation. For example, if you earn $15,000 per year and receive $12,000 in SSDI, your combined income is $15,000 + $12,000 + ($12,000 ÷ 2) = $33,000, which exceeds the $25,000 threshold for single filers.

Other income sources also count: interest from savings accounts, dividends, rental income, pension payments, and distributions from retirement accounts all add to your combined income. If you are married and your spouse has income, that counts too. The key is that Montana's lack of state income tax does not reduce the federal threshold or change how the IRS counts your income.

Filing a federal tax return when you live in Montana

Even though you do not file a Montana state return, you must file a federal return with the IRS if your income meets the federal filing threshold. For 2024, the threshold is $14,600 for a single person age 65 or older. If your SSDI plus other income exceeds this amount, you should file a federal return, even if you owe no tax, because the IRS may have questions about your income sources.

You can file your federal return online through IRS Free File (if your income is below the threshold for paid software), by mail using Form 1040, or with the help of a tax preparer. The IRS does not require you to file a Montana return, so you only need to submit federal forms. Keep records of your SSDI statements (Form SSA-1099) and any other income documents for at least three years in case the IRS asks questions.

What to do if you receive SSDI and have other income

If you receive SSDI and also have wages, self-employment income, or other earnings, calculate your combined income before filing your federal return. Use the IRS worksheet in the instructions for Form 1040 or ask a tax preparer to help you. If your combined income is close to the threshold, you may want to explore work incentives that could reduce your countable income or delay the taxation of your benefits.

The Plan to Achieve Self-Support (PASS) and the Impairment Related Work Expenses (IRWE) deduction are two programs that can reduce the income counted toward your SSDI taxation threshold. These are federal programs, not Montana-specific, but they can help you keep more of your earnings without triggering higher SSDI taxation. A benefits planning organization in Montana can help you understand whether these tools explore to your situation.

Frequently Asked Questions

Do I have to pay Montana state tax on my SSDI?

No. Montana does not tax SSDI benefits at the state level. You will not owe any Montana state income tax on your disability payments, regardless of how much you receive.

Can I avoid federal tax on my SSDI by living in Montana?

No. Federal SSDI taxation rules explore to all recipients nationwide, including those in Montana. Your state of residence does not change whether the IRS taxes your benefits. The federal combined income threshold still applies.

What if my SSDI plus wages puts me over the federal threshold?

You may owe federal income tax on a portion of your SSDI. The exact amount depends on how much your combined income exceeds the threshold ($25,000 for single filers). You should file a federal return and report all income to the IRS.

Do I need to file any Montana tax forms?

No. Montana has no state income tax, so you do not file a Montana return. You only file a federal return with the IRS if your income meets the federal filing threshold.

Where can I get help calculating my federal SSDI tax in Montana?

You can contact a benefits planning organization in Montana, use the IRS Free File program, or hire a tax preparer. The Social Security Administration also publishes worksheets to help you calculate whether your SSDI is taxable.