Whether you pay taxes on Social Security depends on your other income

You may owe federal income tax on your Social Security benefits, but only if your total income exceeds a certain threshold. The IRS calls this threshold your "combined income," and it includes your wages, interest, dividends, and half of your Social Security benefits added together. If your combined income stays below the threshold for your filing status, you pay no tax on Social Security. If it goes above, you may owe tax on up to 85 percent of your benefits.

The thresholds have not changed since 1984, which means more people cross them each year as wages rise. A married couple filing jointly with $32,000 in combined income, for example, will owe tax on some benefits. A single filer with $25,000 in combined income hits the same point. These are the first thresholds; a second, higher threshold determines whether you owe tax on up to 85 percent of benefits instead of 50 percent.

State taxes work differently. Thirteen states tax Social Security benefits under their own rules, while the rest do not. Your state of residence matters, not where you worked or where you collected benefits.

Key Takeaways

  • Combined income — your wages, investment income, and half your Social Security benefits — determines whether you owe federal tax on benefits.
  • The first threshold is $25,000 for single filers and $32,000 for married couples filing jointly; crossing it means tax on up to 50 percent of benefits.
  • A second threshold ($34,000 for single filers, $44,000 for married couples) determines whether you owe tax on up to 85 percent of benefits instead.
  • Thirteen states tax Social Security benefits: Colorado, Connecticut, Kansas, Minnesota, Missouri, Montana, Nebraska, New Mexico, Rhode Island, Utah, Vermont, West Virginia, and Illinois.
  • You can ask Social Security to withhold taxes from your monthly payment, which prevents a surprise tax bill at filing time.

How to calculate your combined income

Start with your adjusted gross income (AGI) from your tax return. This includes wages from work, self-employment income, interest, dividends, capital gains, rental income, and most other sources. Do not include tax-exempt interest from municipal bonds.

Next, add half of your Social Security benefits. If you received $20,000 in benefits during the year, add $10,000 to your AGI. This is your combined income.

Compare this number to the threshold for your filing status. If you are single and your combined income is $25,000 or less, you owe no federal tax on Social Security. If you are married filing jointly and your combined income is $32,000 or less, you owe no federal tax. If you are married filing separately, the threshold is $0 — you almost always owe tax if you have any combined income at all.

If your combined income exceeds the first threshold, use the IRS worksheet in Publication 915 to calculate how much of your benefits are taxable. The worksheet accounts for the gap between your income and the threshold, then applies the 50 percent or 85 percent rule depending on how far above the second threshold you are.

The two tax brackets for Social Security benefits

The IRS applies two separate thresholds, each triggering a different tax rate on your benefits. Understanding both helps you see why a small increase in other income can suddenly make more of your benefits taxable.

The first threshold is $25,000 for single filers, $32,000 for married couples filing jointly, and $0 for married couples filing separately. If your combined income exceeds this threshold, up to 50 percent of your benefits become taxable. For example, a single filer with $27,000 in combined income is $2,000 over the threshold. Half of that $2,000 — or $1,000 — becomes taxable income.

The second threshold is $34,000 for single filers, $44,000 for married couples filing jointly, and $0 for married couples filing separately. If your combined income exceeds this threshold, you may owe tax on up to 85 percent of your benefits instead of 50 percent. A single filer with $40,000 in combined income is $6,000 over the second threshold. The IRS uses a formula to determine how much of that triggers the 85 percent rate, but the result is always capped at 85 percent of your total benefits for the year.

These thresholds have remained fixed since 1984, even as average incomes have risen. This "bracket creep" means more beneficiaries pay tax each year, even if their income has not increased in real terms.

How to report taxable Social Security on your return

You receive a Social Security Benefit Statement (Form SSA-1099) in January for the prior year. This form shows the total benefits you received. You do not file this form with the IRS; it is for your records and to help you calculate taxable income.

On your federal tax return, you report Social Security benefits on Form 1040, lines 5a and 5b. Line 5a shows your total benefits from the SSA-1099. Line 5b shows the taxable portion, which you calculate using the worksheet in IRS Publication 915 or tax software. You only enter a number on line 5b if some of your benefits are taxable; if none are, you leave it blank.

If you use tax software, the program walks you through the combined income calculation and applies the worksheet automatically. If you file by hand, Publication 915 contains the exact worksheet and step-by-step instructions. The worksheet is not difficult, but it requires careful arithmetic — one misplaced number changes your result.

If you are married filing jointly, both spouses' Social Security benefits and all other income count toward the combined income threshold. You report both spouses' benefits on the same return, and the taxable amount applies to your household combined income, not to each person individually.

State taxes on Social Security benefits

Thirteen states tax Social Security benefits under their own income tax rules: Colorado, Connecticut, Kansas, Minnesota, Missouri, Montana, Nebraska, New Mexico, Rhode Island, Utah, Vermont, West Virginia, and Illinois. The other 37 states and Washington, D.C. do not tax Social Security at the state level.

Each state that taxes benefits sets its own thresholds and rates. Some states follow the federal combined income calculation; others use different rules. Colorado, for example, taxes benefits for single filers with combined income above $20,000 and married couples above $32,000. Kansas taxes benefits for single filers above $75,000 and married couples above $100,000. You need to check your state's tax agency website or your state tax return instructions to see whether you owe state tax.

If you move to a different state after you start collecting Social Security, your state tax obligation changes based on your new state of residence. Your benefits do not change, but your tax bill does. Some people in high-tax states move to states with no Social Security tax specifically to reduce their tax burden in retirement.

Withholding taxes from your Social Security payment

You can ask Social Security to withhold federal income tax from your monthly benefit payment. This prevents you from owing a large tax bill when you file your return in April. You request withholding by completing Form W-4V (Voluntary Withholding Request) and submitting it to your local Social Security office or mailing it to Social Security.

You choose a withholding rate: 7 percent, 10 percent, 15 percent, or 25 percent of your monthly benefit. Social Security withholds that percentage from each payment and sends it to the IRS on your behalf. If you have other income, you may want to coordinate this withholding with any withholding from your job or pension so that your total withholding covers your full tax liability.

Withholding is optional, but it is useful if you know you will owe tax and want to avoid a large payment in April. You can change or stop withholding at any time by submitting a new Form W-4V. If you stop withholding and later realize you owe tax, you can restart it, but the IRS will not refund taxes you did not withhold in prior months.

Common mistakes that lead to unexpected tax bills

The most common mistake is forgetting to include half of Social Security benefits in the combined income calculation. Many people add up their wages and investment income, compare it to the threshold, and assume they owe no tax — then forget that half of their benefits count too. This pushes them over the threshold without realizing it.

A second mistake is not accounting for tax-deferred retirement account withdrawals. If you withdraw money from a traditional IRA or 401(k), that withdrawal counts as income for the combined income calculation, even though you may have already paid tax on the money when you earned it. A $10,000 IRA withdrawal can push $5,000 of your Social Security benefits into taxable income.

A third mistake is underestimating the effect of the second threshold. Many people know about the first threshold but do not realize that crossing the second threshold can make 85 percent of their benefits taxable instead of 50 percent. A $10,000 increase in other income near the second threshold can make $8,500 of benefits taxable, not $5,000.

Finally, some people do not realize that their spouse's income counts if they file jointly. If you are married filing jointly, your spouse's wages, pensions, and investment income all count toward the combined income threshold, even if only one of you receives Social Security. This catches many couples by surprise when one spouse returns to work or starts drawing a pension.

Frequently Asked Questions

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

No. If Social Security is your only income and you are not required to file for other reasons, you do not have to file a federal return. However, if you have other income or if some of your benefits are taxable, you must file to report the taxable portion and pay any tax owed.

What if I worked in another country and have foreign income?

Foreign income counts toward your combined income for Social Security tax purposes. If you earned wages or received income abroad, add that to your U.S. income when calculating combined income. You may also owe U.S. tax on foreign income, depending on your citizenship and residency status.

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

You can reduce certain types of income. For example, contributing to a traditional IRA lowers your adjusted gross income, which lowers your combined income. However, withdrawals from retirement accounts increase combined income, so the timing of withdrawals matters. Consult a tax professional if you are trying to manage income in retirement.

What happens if I underreport my Social Security income by mistake?

The IRS matches your tax return to the SSA-1099 form Social Security sends them. If your return does not match, the IRS will contact you with a notice. You can correct the error by filing an amended return (Form 1040-X) and paying any additional tax owed, plus interest and penalties if the error was substantial.

Does my spouse's Social Security count if we file separately?

Yes. If you are married filing separately, your spouse's Social Security benefits do not count toward your combined income threshold. However, the threshold for married filing separately is $0, meaning you almost always owe tax on at least some benefits if you have any other income at all. Filing separately is rarely advantageous for Social Security tax purposes.