The federal government taxes some Social Security benefits, but not all of them

Whether you owe federal income tax on your Social Security depends on your total income for the year. If your income stays below a certain threshold, you pay no tax on your benefits. If your income exceeds that threshold, you may owe tax on up to 85 percent of what you receive. The IRS uses a formula called "combined income" to determine this — it includes your adjusted gross income, nontaxable interest, and half of your Social Security benefits.

The income thresholds have not changed since 1984. For a single filer in 2024, the first threshold is $25,000; for married filing jointly, it is $32,000. These amounts do not adjust for inflation, which means more people cross into taxable territory each year. If your combined income exceeds these thresholds, you calculate tax on your benefits using IRS worksheets or software.

Key Takeaways

  • You owe federal tax on Social Security only 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 filing jointly.
  • If you exceed the first threshold, up to 50 percent of your benefits become taxable; if you exceed a second threshold ($34,000 single, $44,000 married), up to 85 percent becomes taxable.
  • The IRS does not automatically withhold tax from Social Security payments, so you may need to make quarterly estimated tax payments or request voluntary withholding.
  • State income tax on Social Security varies by state — some states tax benefits, others do not, and rules differ based on your age and income.

How the IRS calculates combined income

Combined income is not the same as your adjusted gross income (AGI). The IRS starts with your AGI, then adds back certain deductions and adds nontaxable interest (such as interest from municipal bonds). Then it adds half of your Social Security benefits. The result is your combined income, which determines whether any of your benefits are taxable.

This formula means that income sources you might not think of as "income" can push you over the threshold. Nontaxable interest, tax-exempt bond interest, and distributions from certain retirement accounts all count. If you are working part-time while receiving benefits, your wages count in full. Pension income, rental income, and capital gains all count toward combined income.

The two tax brackets for Social Security benefits

The IRS uses two thresholds to determine how much of your benefits are taxable. The first threshold is $25,000 for single filers and $32,000 for married filing jointly. If your combined income exceeds this threshold, up to 50 percent of your benefits become subject to federal income tax.

The second threshold is $34,000 for single filers and $44,000 for married filing jointly. If your combined income exceeds this higher threshold, up to 85 percent of your benefits become subject to federal income tax. The actual percentage you owe depends on how far above the threshold you are; the IRS worksheet walks you through the calculation.

For example, a single filer with combined income of $30,000 would have some benefits taxed at the 50 percent rate. A single filer with combined income of $40,000 would calculate tax using both the 50 percent and 85 percent rules, with the result that a larger portion of benefits becomes taxable.

Withholding and estimated tax payments

The Social Security Administration does not automatically withhold federal income tax from your benefit payments. If you know you will owe tax, you have two options: request voluntary withholding from your benefits, or make quarterly estimated tax payments to the IRS.

To request withholding, complete IRS Form W-4V and send it to your local Social Security office. You can choose to have 7, 10, 12, or 22 percent of your monthly benefit withheld. This is simpler than estimated payments but may not cover your full tax liability if you have other income. If you choose estimated payments instead, you file Form 1040-ES with the IRS four times per year.

Many people who receive Social Security also receive pension income, investment income, or wages. In those cases, you might request withholding from the other income source instead of from Social Security itself. The key is ensuring that enough tax is withheld or paid throughout the year to avoid penalties.

State income tax on Social Security

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 significantly by state. Some states follow the federal formula; others use different income thresholds or tax a different percentage of benefits.

Some states exempt benefits for residents over a certain age, typically 55 or 62. Others exempt benefits only if your income falls below a state-specific threshold. A few states tax only the portion of benefits that is taxable at the federal level. You will need to check your state's tax authority website or consult a tax preparer familiar with your state's rules.

What to do if you receive a notice from the IRS

If the IRS sends you a notice about Social Security tax, it usually means the agency believes you owe tax on your benefits based on information it received from the Social Security Administration. The notice will show the amount the IRS calculated and explain how it arrived at that figure.

Review the notice carefully. Check that the Social Security income amount matches your records and that your other income is reported correctly. If you disagree with the calculation, you can respond to the IRS within the timeframe shown on the notice, usually 30 days. If you agree but cannot pay in full, the IRS offers payment plans and other options. Keep records of your income sources and any withholding or estimated payments you made during the year.

Planning ahead to reduce taxable benefits

If you are still working or have control over when you receive certain income, you may be able to manage your combined income to stay below the tax threshold. Delaying Social Security benefits means lower combined income in earlier years. Timing the sale of investments or the withdrawal of retirement account funds can also affect your combined income in a given year.

Some people use a Roth conversion strategy, which involves converting traditional IRA funds to a Roth IRA in years when their income is lower. Because Roth conversions are taxable, this approach requires careful planning, but it can reduce combined income in future years. A tax professional or financial advisor can model different scenarios based on your specific situation.

Frequently Asked Questions

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

Not necessarily. If Social Security is your only income and it is below the filing threshold for your age and filing status, you do not have to file. However, if you had federal income tax withheld from your benefits or if you are owed a refundable tax credit, filing a return may result in a refund.

What if I worked overseas and have foreign income?

Foreign earned income and foreign investment income both count toward combined income for Social Security tax purposes. If you are a U.S. citizen or resident alien, you must report worldwide income to the IRS. The foreign earned income exclusion does not reduce your combined income calculation for Social Security tax.

Can I reduce my combined income by taking a loss on investments?

Capital losses can offset capital gains and up to $3,000 of other income per year. If you have investment losses, they reduce your adjusted gross income, which in turn reduces your combined income. However, you cannot carry forward unused losses indefinitely — they are limited to $3,000 per year unless you have ongoing capital gains.

What happens if I did not pay tax on my benefits in previous years?

If you discover you owed tax in a prior year, you can file an amended return using Form 1040-X for that year. The IRS generally allows you to go back three years. Filing an amended return may result in owing back taxes plus interest, but it prevents the IRS from assessing penalties based on unreported income.