Social Security benefits are taxable income for federal tax purposes if your total income exceeds certain thresholds, and those thresholds do not change year to year

Whether you owe federal income tax on your Social Security depends on your combined income — not just what you receive from Social Security. The IRS uses a formula that adds your adjusted gross income, nontaxable interest, and half your Social Security benefits. If that total exceeds a base amount set by law, a portion of your benefits becomes taxable. The base amounts have stayed the same since 1984: $25,000 for single filers and $32,000 for married couples filing jointly.

This means the same people who paid tax on benefits in 2025 will likely pay tax in 2026, and those who did not will likely not. Your state may also tax Social Security benefits — 13 states currently do, though the rules and exemptions vary by state.

Key Takeaways

  • You calculate whether benefits are taxable by adding your adjusted gross income, nontaxable interest, and half your Social Security benefits; if that sum exceeds $25,000 (single) or $32,000 (married filing jointly), some benefits are taxable.
  • The income thresholds that determine taxability have not changed since 1984 and will not change in 2026, so your tax situation will be similar to 2025 unless your income changed.
  • Up to 85 percent of your benefits can be taxed in the worst case, but most people who owe tax pay on a smaller portion.
  • Thirteen states tax Social Security benefits under their own rules, separate from federal tax, so check your state's rules if you live in one of those states.
  • You can reduce the amount of benefits subject to tax by lowering other income — for example, by delaying withdrawals from retirement accounts or managing when you claim capital gains.

How the IRS calculates whether your benefits are taxable

The IRS uses a two-step process. First, add your adjusted gross income (line 11 on Form 1040), any nontaxable interest income, and half of your Social Security benefits. This sum is your combined income. Then compare it to your base amount.

If your combined income is below the base amount, none of your benefits are taxable. If it exceeds the base amount, the IRS taxes the lesser of two amounts: either half of the excess over the base, or half your total Social Security benefits. In some cases, if your combined income is very high, up to 85 percent of your benefits can be taxed.

Example: You are single, received $20,000 in Social Security, and had $15,000 in other income and $500 in tax-exempt interest. Your combined income is $15,000 + $500 + ($20,000 × 0.5) = $25,500. Your base is $25,000. The excess is $500. Half the excess is $250. You would owe tax on $250 of your $20,000 in benefits.

What counts as income for this calculation

The combined income formula includes wages, self-employment income, pensions, interest, dividends, capital gains, and distributions from retirement accounts like IRAs and 401(k)s. It also includes nontaxable interest from municipal bonds — a detail many people miss. Roth IRA conversions count as income in the year you convert, even though the conversion itself is not taxed.

What does not count: Supplemental Security Income (SSI), railroad retirement benefits, veterans' benefits, and the return of your own contributions to a Roth IRA. may have access to charitable distributions from IRAs (if you are over 70½) also do not count.

This is why some retirees with modest Social Security can still owe tax — a single large capital gain, a required minimum distribution from an IRA, or a pension can push combined income over the threshold even if Social Security is their only "retirement" income in the traditional sense.

The two-tier tax structure and how much of your benefits can be taxed

The tax code creates two tiers of taxation. In the first tier, up to 50 percent of your benefits can be taxed. This applies when your combined income exceeds the base amount but stays below a second threshold: $34,000 for single filers and $44,000 for married couples filing jointly.

In the second tier, up to an additional 35 percent of your benefits can be taxed, for a maximum of 85 percent total. This applies when your combined income exceeds the second threshold. Very few people reach the 85 percent cap — it requires substantial income from sources other than Social Security.

The IRS Worksheet A (in the instructions for Form 1040) walks through the calculation. If you use tax software, it usually handles this automatically. If you file by hand, the worksheet can be tedious, which is why many people with Social Security income use software or a tax preparer.

State taxes on Social Security benefits

Thirteen states tax Social Security benefits under their own rules: Colorado, Connecticut, Kansas, Minnesota, Missouri, Montana, Nebraska, New Mexico, Rhode Island, Utah, Vermont, and West Virginia. Each state has its own income thresholds and rules about what portion is taxable.

Some states exempt benefits entirely for people over a certain age or with income below a certain level. Others tax benefits the same way the federal government does. A few states have phased out their Social Security tax in recent years, so the list may change. Check your state's revenue or taxation department website for the current rules in your state.

If you live in a state that taxes Social Security but moved there after you started receiving benefits, the state may have grandfather rules that protect you from taxation. If you moved to a state that taxes Social Security, you may owe state tax starting in the year you establish residency there.

Strategies to reduce the amount of benefits subject to tax

Because the calculation depends on combined income, lowering your other income can reduce the portion of benefits that is taxable. This is not about hiding income — it is about timing and choosing which accounts to draw from.

Delay withdrawals from IRAs and 401(k)s if you do not need them yet. A required minimum distribution (RMD) counts as income, but if you have not reached the age for RMDs, you can control when you take distributions. Roth conversions increase income in the year of conversion, so consider doing them in years when your other income is low.

Harvest capital losses to offset capital gains. If you sold an investment at a loss, use that loss to reduce gains from other sales. Manage the timing of when you sell appreciated assets — selling in a year when your other income is lower can keep combined income below a threshold.

may have access to charitable distributions (QCDs) allow people over 70½ to transfer up to $100,000 per year directly from an IRA to a charity. The distribution does not count as income, so it does not increase combined income and does not trigger taxation of benefits. This is one of the most powerful tools for high-income retirees.

How to report taxable Social Security on your tax return

Social Security benefits appear on Form SSA-1099, which you receive by January 31 each year. The form shows the total benefits you received in the prior year. You report this on Form 1040, line 5a (total benefits) and line 5b (taxable portion).

If you use tax software, you enter the amounts from your SSA-1099, and the software calculates how much is taxable using the IRS worksheet. If you file by hand, you complete Worksheet A in the Form 1040 instructions. If you have a tax preparer, bring the SSA-1099 along with your other income documents.

Do not assume that because you received a Form SSA-1099 you must report all of it as income. Many people receive the form but owe no tax on the benefits because their combined income is below the threshold. You still report the full amount on line 5a, but line 5b will be zero.

Frequently Asked Questions

Will the income thresholds change in 2026?

No. The thresholds have been $25,000 (single) and $32,000 (married filing jointly) since 1984 and are not indexed for inflation. Congress would have to pass a law to change them. This means the same income level that triggered taxation in 2025 will trigger it in 2026.

If I am married filing separately, what is my threshold?

If you are married and file separate returns, the threshold is $0 — meaning any combined income at all can result in taxation of benefits. This is why married couples almost always file jointly when one or both receive Social Security. Consult a tax preparer if you are considering filing separately.

Does Medicare premium withholding count as income for this calculation?

No. Medicare premiums withheld from your Social Security check do not reduce the amount of benefits counted in the combined income formula. You report the full benefit amount on your tax return, even if Medicare took part of it.

Can I avoid taxation by not claiming Social Security until later?

Delaying Social Security reduces your combined income in the years you do not claim, which can lower or eliminate taxation of benefits during those years. However, once you start claiming, the same thresholds explore. Delaying is a strategy for managing income in early retirement years, not a way to permanently avoid taxation.

What if I made a mistake on a prior year's return and did not report taxable benefits correctly?

You can file an amended return using Form 1040-X for any of the past three years. The IRS may assess additional tax, interest, and penalties depending on how much was owed and how long ago the error occurred. A tax preparer or the IRS can help you determine what you owe.