You may owe federal income tax on your Social Security benefits, depending on your total income for the year

Social Security benefits are not automatically tax-free. The IRS taxes a portion of your benefits if your combined income exceeds certain thresholds. Combined income means your adjusted gross income plus nontaxable interest plus half of your Social Security benefits for the year.

The thresholds are $25,000 for single filers and $32,000 for married couples filing jointly. If you are married filing separately, the threshold is $0 — meaning any combined income at all can trigger taxation. These thresholds have not changed since 1984, so they affect more people now than they did decades ago.

How much of your benefits get taxed depends on how far your combined income exceeds the threshold. You could owe tax on up to 50 percent of your benefits, or up to 85 percent in some cases. The IRS uses a two-tier calculation to determine the exact amount.

Key Takeaways

  • You may owe federal income tax on Social Security if your combined income (adjusted gross income plus nontaxable interest plus half your benefits) exceeds $25,000 for single filers or $32,000 for married couples filing jointly.
  • Combined income includes wages, pensions, investment income, and other retirement distributions, not just Social Security.
  • Between 50 and 85 percent of your benefits may be taxable, depending on how much your combined income exceeds the threshold.
  • Most states do not tax Social Security benefits, but a few do, so check your state's rules separately.
  • You can request the IRS withhold taxes from your monthly benefit check to avoid owing a large amount at tax time.

How the IRS calculates what portion of your benefits is taxable

The calculation uses two tiers. In the first tier, if your combined income exceeds the threshold by up to $9,000 (or $12,000 for married filing jointly), you may owe tax on up to 50 percent of your benefits. The amount taxed is the lesser of half your benefits or half the amount you exceeded the threshold by.

In the second tier, if your combined income exceeds the threshold by more than $9,000 (or $12,000 for married filing jointly), you may owe tax on up to 85 percent of your benefits. This is calculated as 85 percent of the amount over the second threshold, plus any amount already taxed in the first tier.

Example: A single filer with $30,000 in combined income has exceeded the $25,000 threshold by $5,000. Half of $5,000 is $2,500. If their annual Social Security benefit is $20,000, half of that is $10,000. The taxable amount is the lesser of these two: $2,500. So they owe tax on $2,500 of their $20,000 benefit.

What counts as income for the combined income calculation

Combined income includes your adjusted gross income (wages, self-employment income, interest, dividends, capital gains, pensions, and distributions from retirement accounts like IRAs and 401(k)s) plus any nontaxable interest (such as interest from municipal bonds) plus half of your Social Security benefits.

It does not include Supplemental Security Income (SSI), which is a separate need-based program. It also does not include certain railroad retirement benefits or veterans' benefits, though the rules vary depending on the type of benefit.

If you are still working and receiving Social Security before full retirement age, your earned wages count toward combined income. This is one reason people sometimes owe tax on benefits even if they have no other income sources.

State income tax on Social Security benefits

Most states do not tax Social Security benefits at all. However, a small number of states do tax some or all of your benefits: Colorado, Connecticut, Kansas, Minnesota, Missouri, Montana, Nebraska, New Mexico, Rhode Island, Utah, and Vermont.

Each of these states has different rules about what portion is taxable and what income thresholds explore. Some states exempt benefits for people over a certain age or with income below a certain level. You will need to check your specific state's tax rules when you file your state return.

If you live in a state that taxes Social Security, the state uses its own calculation rather than the federal one. Your state tax form will ask for your Social Security income and guide you through the calculation.

How to request tax withholding from your Social Security check

If you know you will owe federal income tax on your benefits, you can ask the Social Security Administration to withhold taxes from your monthly payment. This prevents you from owing a large amount when you file your tax return.

To set up withholding, complete Form W-4V (Voluntary Withholding Request) and mail it to your local Social Security office, or bring it in person. You can also request withholding by calling Social Security at 1-800-772-1213. You choose the withholding rate: 7 percent, 10 percent, 15 percent, or 25 percent of your benefit.

Social Security will begin withholding the following month. If you want to change or stop withholding later, you can submit a new Form W-4V at any time. Keep in mind that withholding reduces your monthly check, so budget accordingly.

Reporting Social Security income on your tax return

The Social Security Administration sends you a Form SSA-1099 each January showing the total benefits you received in the previous year. Use this form to report your benefits on your federal tax return.

If you file Form 1040 or 1040-SR, you will enter your Social Security benefits on line 5b. If any of your benefits are taxable, you will also complete a worksheet (included in the tax instruction booklet) to calculate the taxable portion. Some tax software walks you through this calculation automatically.

You must report your benefits even if none of them are taxable. The IRS uses the SSA-1099 to verify that you reported the correct amount.

What to do if you receive benefits for only part of the year

If you started or stopped receiving Social Security partway through the year, your combined income calculation is based only on the months you received benefits. The SSA-1099 will show the exact amount you received.

This matters because your combined income threshold is based on a full year. If you received benefits for only six months, your threshold is still $25,000 (or $32,000 for married filing jointly), but your combined income is lower because you had fewer months of benefits and possibly fewer months of other income.

Some people delay claiming Social Security until later in the year to keep their combined income below the threshold. This is a strategy worth discussing with a tax professional if you are on the edge of the threshold.

Frequently Asked Questions

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

Not necessarily. If Social Security is your only income and none of it is taxable, you do not have to file. However, if you have other income (wages, interest, dividends, pensions), you may need to file even if your total is below the standard deduction. Check the IRS filing requirements for your age and filing status.

Can I reduce my combined income to avoid paying tax on benefits?

Some strategies exist, such as delaying Social Security, converting traditional IRA withdrawals to Roth conversions in lower-income years, or timing capital gains. These are complex decisions that depend on your full financial picture. A tax professional or financial advisor can help you explore options.

What if I disagree with the amount of tax withheld from my benefits?

You can adjust your withholding by submitting a new Form W-4V to Social Security. If you overpaid taxes, you will get a refund when you file your return. If you underpaid, you will owe the difference at tax time.

Do I pay tax on Social Security Disability Insurance (SSDI) the same way?

Yes. SSDI benefits are taxed using the same combined income calculation as retirement benefits. The only difference is that SSDI recipients under full retirement age who work may have benefits reduced if they earn above a certain amount, but those reduced benefits are still taxable if your combined income exceeds the threshold.

If I move to another country, do I still owe US tax on Social Security?

Yes, US citizens owe federal income tax on Social Security benefits regardless of where they live. However, you may be able to claim a foreign earned income exclusion or foreign tax credit if you pay taxes to another country. The rules are complex and depend on your citizenship and tax residency status.