You may owe federal income tax on Social Security, depending on your total income

Whether you pay federal income tax on Social Security depends on how much other income you have. The IRS uses a formula called combined income to decide this. Combined income includes your adjusted gross income, nontaxable interest, and half of your Social Security benefits. If your combined income exceeds a certain threshold, you must include part of your Social Security in your taxable income.

The thresholds are $25,000 for single filers and $32,000 for married couples filing jointly. These thresholds have not changed since 1984. If you are married filing separately, the threshold is $0 — meaning any Social Security at all may trigger tax on your benefits if you have other income.

The amount you actually owe tax on is not your entire benefit. The IRS taxes either 50% or 85% of your benefits, depending on how far your combined income exceeds the threshold. Most people who owe tax on Social Security pay tax on no more than 50% of their benefits.

Key Takeaways

  • You owe tax on Social Security only if your combined income (wages, pensions, interest, plus half your benefits) exceeds $25,000 for single filers or $32,000 for married filing jointly.
  • Combined income is calculated by the IRS using a specific formula that includes adjusted gross income, nontaxable interest, and half your Social Security benefits.
  • If you owe tax, you pay it on either 50% or 85% of your benefits, not the full amount.
  • You can request that the Social Security Administration withhold federal income tax from your monthly benefit check to avoid a large tax bill at filing time.
  • State income tax on Social Security varies by state — some states do not tax Social Security at all, while others follow federal rules.

How the IRS calculates combined income

Combined income is not the same as your adjusted gross income (AGI). To find your combined income, start with your AGI, add back any tax-exempt interest (such as municipal bond interest), and add half of your Social Security benefits. That total is what the IRS uses to determine whether you owe tax on your benefits.

Example: You are single with $20,000 in pension income, $3,000 in taxable interest, and $15,000 in Social Security benefits. Your AGI is $23,000. Half your Social Security is $7,500. Your combined income is $23,000 + $7,500 = $30,500. Since $30,500 exceeds $25,000, you owe tax on part of your benefits.

The formula matters because income sources you might not think of as "income" count toward the threshold. Distributions from a traditional IRA, a pension, or a 401(k) all count. Wages from part-time work count. Taxable interest and dividends count. Nontaxable interest does not count toward your AGI, but it does count toward combined income.

How much of your benefits is taxable

Once you know your combined income exceeds the threshold, the IRS uses a two-tier system to calculate how much of your benefits you owe tax on. The first tier applies to the amount between the threshold and $9,000 above it (for single filers; $12,000 for married filing jointly). The second tier applies to amounts above that.

In the first tier, you pay tax on the lesser of (1) 50% of your benefits or (2) 50% of the amount your combined income exceeds the threshold. In the second tier, you pay tax on the lesser of (1) 85% of your benefits or (2) 85% of the amount your combined income exceeds the second threshold, plus any amount taxed in the first tier.

This means most people who owe tax on Social Security pay tax on no more than 50% of their benefits. You would pay tax on 85% of your benefits only if your combined income is substantially higher than the threshold — typically $34,000 or more for single filers.

Withholding tax from your Social Security check

You can ask the Social Security Administration to withhold federal income tax from your monthly benefit payment. This prevents you from owing a large amount when you file your tax return. You do this by completing Form W-4V 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%, 10%, 15%, or 22%. The withholding is calculated on your gross benefit amount. You can change your withholding rate at any time by submitting a new Form W-4V, or you can stop withholding altogether.

Withholding is voluntary and does not change whether you owe tax on your benefits. It simply spreads the tax payment across the year instead of requiring a lump sum at tax time. If you have other income sources and expect to owe tax, withholding can help you avoid underpayment penalties.

State income tax on Social Security benefits

Thirteen states tax Social Security benefits to some degree: Colorado, Connecticut, Kansas, Minnesota, Missouri, Montana, Nebraska, New Mexico, Rhode Island, Utah, Vermont, and West Virginia. The rules vary by state. Some states follow the federal formula exactly. Others have different thresholds or tax a different percentage of benefits.

Thirty-seven states do not tax Social Security benefits at all. If you live in one of those states, you owe no state income tax on your benefits even if you owe federal tax. If you live in a state that does tax Social Security, your state tax return instructions will explain the calculation.

If you moved to a new state after you started receiving Social Security, check your new state's rules. Some states that tax Social Security offer exemptions for people over a certain age or with income below a threshold.

Reporting Social Security on your tax return

Social Security benefits appear on a Form SSA-1099, which the Social Security Administration mails to you by January 31 each year. The form shows your gross benefit amount for the previous year. You use this form to complete your federal tax return.

You report your Social Security benefits on Form 1040 or Form 1040-SR (for people 65 and older). The IRS worksheet in the Form 1040 instructions walks you through the calculation of how much of your benefits is taxable. If you use tax software, the software performs this calculation for you.

If you did not receive a Form SSA-1099 by early February, contact the Social Security Administration at 1-800-772-1213 or visit ssa.gov to request a replacement. You need the form to file your return accurately, even if you did not owe tax on your benefits.

What happens if you underestimate your tax

If you do not withhold enough tax or pay enough through estimated tax payments, you may owe a penalty for underpayment. The IRS charges interest on unpaid tax and may assess an underpayment penalty if your tax liability is high enough.

You can avoid underpayment penalties by withholding tax from your Social Security check, making quarterly estimated tax payments, or ensuring your other income sources (such as a pension or part-time job) have enough tax withheld. If you are unsure whether you are withholding enough, the IRS offers a Tax Withholding Estimator on irs.gov that you can use to check.

Frequently Asked Questions

Do I have to file a tax return if I only receive Social Security?

No, not unless your combined income exceeds the threshold for your filing status. If Social Security is your only income and it is below $14,600 (for single filers in 2024), you generally do not have to file. However, filing may be worth it if you had taxes withheld, because you could receive a refund.

What if I work part-time and receive Social Security?

Your wages count toward combined income, which may push you over the threshold and trigger tax on your benefits. Additionally, if you are under full retirement age and earn above a certain amount, Social Security reduces your monthly benefit. The earnings limit and benefit reduction are separate from the income tax calculation.

Can I reduce my combined income to avoid tax on Social Security?

Not easily. The formula includes income sources you cannot avoid — pensions, IRAs, and wages all count. Some people use strategies like converting traditional IRA withdrawals to Roth conversions in lower-income years, but these require planning and may have other tax consequences. Consult a tax professional about your specific situation.

If I move to a state with no Social Security tax, do I owe less federal tax?

No. Federal income tax on Social Security is the same regardless of where you live. Moving to a state with no Social Security tax saves you only state tax, not federal tax. However, the savings can still be significant if you owe state tax on your benefits.

What if I received Social Security benefits for only part of the year?

Your Form SSA-1099 will show only the benefits you received during the months you were may have access to to them. Use that amount to calculate your combined income. If you started or stopped receiving benefits mid-year, your combined income for that year may be lower than in a full year.