Whether your Social Security is taxed depends on your total income, not just what you receive from Social Security

The IRS taxes Social Security benefits based on your combined income, which includes wages, interest, dividends, and half of your Social Security payments. If your combined income falls below a certain threshold, you pay no tax on your benefits. If it exceeds that threshold, you may owe tax on 50% or 85% of your benefits — not the full amount.

The thresholds are $25,000 for single filers and $32,000 for married couples filing jointly. These numbers have not changed since 1984 and do not adjust for inflation. If your combined income is below these thresholds, your Social Security is not taxed at all. If you exceed them, you calculate taxable benefits using a formula the IRS provides on Form 1040.

Key Takeaways

  • Combined income — not Social Security alone — determines whether benefits are taxed; combined income includes half your Social Security plus all other income sources.
  • Single filers with combined income under $25,000 and married filers under $32,000 owe no tax on Social Security benefits.
  • If you exceed the threshold, between 50% and 85% of your benefits become taxable, depending on how far over you go.
  • You report taxable Social Security on Form 1040 using the worksheet in the instructions; the Social Security Administration sends Form SSA-1099 showing your annual benefit amount.

How the IRS calculates combined income

Combined income is not the same as adjusted gross income (AGI). The IRS defines it as your AGI plus nontaxable interest plus half your Social Security benefits. Start with your W-2 wages, self-employment income, pensions, interest, dividends, and capital gains. Then add back any deductions you took for student loan interest or IRA contributions. Finally, add half of the Social Security you received during the year.

Example: You are single and received $20,000 in Social Security. You also earned $10,000 in part-time wages and $500 in interest. Your combined income is $10,000 + $500 + ($20,000 × 0.5) = $10,500. Since $10,500 is below $25,000, none of your Social Security is taxed.

If instead you earned $20,000 in wages, $500 in interest, and $20,000 in Social Security, your combined income would be $20,500 + ($20,000 × 0.5) = $30,500. You are $5,500 over the $25,000 threshold, so part of your benefits become taxable.

The two-tier tax formula for Social Security

Once you exceed the threshold, the IRS uses a two-step formula to determine how much of your benefits are taxed. The first tier taxes up to 50% of your benefits; the second tier taxes up to an additional 35%, for a maximum of 85% taxable.

First tier: Take the amount by which your combined income exceeds the threshold. Multiply it by 0.5. Compare this to half your annual Social Security benefit. Whichever is smaller becomes taxable in the first tier.

Second tier: If your combined income exceeds a higher threshold ($34,000 for single filers, $44,000 for married filers), you may owe tax on additional benefits. The calculation is complex, but the result is that you never pay tax on more than 85% of your benefits in any year.

Example: You are single with $30,500 combined income and $20,000 in Social Security. First tier: ($30,500 − $25,000) × 0.5 = $2,750. Half your benefit is $10,000. The smaller amount is $2,750, so $2,750 of your benefits are taxable in the first tier. You do not reach the second tier because your combined income is below $34,000. Your taxable Social Security is $2,750.

State and local taxes on Social Security

Thirteen states tax Social Security benefits: Colorado, Connecticut, Kansas, Minnesota, Missouri, Montana, Nebraska, New Mexico, Rhode Island, Utah, Vermont, and West Virginia. Each state sets its own rules and thresholds, which differ from federal rules.

Some states exempt benefits entirely if your income falls below a certain level. Others tax all benefits regardless of income. A few states tax only the portion that is taxable at the federal level. Contact your state tax authority or check your state's tax form instructions to learn the rules where you live.

What documents you receive and when

The Social Security Administration sends Form SSA-1099 to all beneficiaries by January 31 each year. This form shows the total benefits you received in the previous calendar year. You use this amount to calculate your combined income and determine whether any benefits are taxable.

If you did not receive Form SSA-1099 by early February, you can create a my Social Security account at ssa.gov and view your benefit statement online. You can also call Social Security at 1-800-772-1213 to request a replacement form.

When you file your tax return, you report taxable Social Security on Form 1040, line 5b. The IRS provides a worksheet in the Form 1040 instructions to help you calculate the taxable amount. If your situation is complex — for example, if you have both wages and self-employment income — a tax preparer can help you work through the calculation.

Withholding and estimated tax payments

If you know some of your Social Security will be taxed, you can ask Social Security to withhold federal income tax from your monthly benefit. Complete Form W-4V (Voluntary Withholding Request) and submit it to your local Social Security office or mail it to the address on the form.

You can choose to have 7%, 10%, 12%, or 22% of your benefit withheld each month. This reduces the amount you receive but also reduces what you owe when you file your return. If you prefer not to have tax withheld, you can make quarterly estimated tax payments to the IRS instead, though this requires more planning.

If you have other income sources — such as a pension or part-time work — you may want to adjust withholding on those sources instead of or in addition to Social Security withholding. A tax preparer or the IRS can help you calculate the right withholding amount.

Frequently Asked Questions

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

Some income sources cannot be reduced — wages and pensions are what they are. However, you can control the timing of certain income. For example, if you are self-employed, you might defer invoicing until the next calendar year. You can also delay taking distributions from retirement accounts if you have not yet reached the required minimum distribution age. A tax professional can advise on strategies specific to your situation.

What if I worked outside the United States and have foreign income?

Foreign earned income and foreign investment income count toward combined income for Social Security tax purposes, just as U.S. income does. However, you may be able to exclude some foreign earned income using the Foreign Earned Income Exclusion, which would reduce your combined income. This is complex; consult a tax professional who handles international returns.

Do I have to pay taxes on Social Security if I am still working?

Yes, if your combined income exceeds the threshold. Your wages count toward combined income, so working part-time or full-time while receiving benefits can push you over the limit. There is no special exemption for people who are still employed.

What happens if I owe taxes but did not have enough withheld?

You will owe the difference when you file your return. If you owe a large amount, you may face a penalty for underpayment of estimated tax. To avoid this next year, increase withholding on your Social Security or other income sources, or make quarterly estimated tax payments.

Are Supplemental Security Income (SSI) benefits taxable?

No. SSI is a needs-based program for low-income individuals and is not taxable. Only Social Security retirement, survivor, and disability benefits (SSDI) are subject to the tax rules described here. If you receive SSI, you do not report it as income on your tax return.