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

Social Security itself is not automatically taxable. But the IRS counts part or all of your benefits as taxable income if your combined income exceeds certain thresholds. Combined income means your adjusted gross income plus nontaxable interest plus half your Social Security benefits. If you are married filing jointly, the threshold is $32,000. If you are single or head of household, it is $25,000. If you are married filing separately, it is $0 — meaning you will almost certainly owe tax on your benefits.

How much of your benefits gets taxed depends on how far over the threshold you go. Up to 50 percent of your benefits may be taxable if you are modestly over the limit. Up to 85 percent becomes taxable if your combined income is much higher. You do not pay tax on the full amount; the formula is designed so that only the portion above the threshold is subject to tax.

State taxes are separate. Some states do not tax Social Security at all. Others tax it the same way the federal government does. A few states tax it only if your income is very high. Check your state's tax authority website to learn what applies where you live.

Key Takeaways

  • You owe federal tax on Social Security only if your combined income (adjusted gross income plus half your benefits) exceeds $25,000 for single filers or $32,000 for married filers filing jointly.
  • Combined income includes wages, pensions, investment income, and nontaxable interest, so even a small pension or part-time job can push you over the threshold.
  • If you are over the threshold, between 50 and 85 percent of your benefits may be taxable, not the full amount.
  • State tax treatment of Social Security varies widely, so you need to check your own state's rules rather than assume federal rules explore.

How the IRS calculates combined income

Combined income is not the same as your total income. The IRS starts with your adjusted gross income (AGI) — the number on line 11 of your Form 1040. Then it adds back any nontaxable interest you earned, such as interest from municipal bonds. Then it adds half of your Social Security benefits. That total is your combined income for the purpose of deciding whether your benefits are taxable.

This matters because a small amount of other income can push you over the threshold. If you are single and have $24,000 in pension income, you are $1,000 below the threshold. But if you also have $2,000 in nontaxable interest and receive $20,000 in Social Security, your combined income is $24,000 plus $2,000 plus $10,000 (half of $20,000), which equals $36,000. You are now $11,000 over the threshold, and some of your benefits become taxable.

Part-time work, rental income, and investment gains all count toward combined income. Supplemental Security Income (SSI) does not count, and neither do certain veterans benefits. If you are unsure whether a particular income source counts, the IRS Publication 915 lists what does and does not.

The tax brackets for Social Security benefits

Once you know your combined income, the IRS applies a two-tier system to determine how much of your benefits is taxable. The first tier applies if your combined income is between the base threshold and a higher threshold. For single filers, the base is $25,000 and the higher threshold is $34,000. For married filers filing jointly, the base is $32,000 and the higher threshold is $44,000.

If your combined income falls between the base and the higher threshold, up to 50 percent of your benefits may be taxable. The exact amount depends on how far over the base you are. If your combined income exceeds the higher threshold, up to 85 percent of your benefits may be taxable. Again, the exact amount is calculated using a formula that considers how far over the higher threshold you go.

The formula is complex, but the IRS Worksheet in Publication 915 walks you through it step by step. Many tax software programs also calculate this automatically. If you prepare your own return, using the worksheet is more reliable than trying to estimate.

What happens if you owe tax on your benefits

If you owe tax on your Social Security benefits, you can pay it in several ways. You can make a lump-sum payment when you file your return. You can set up a payment plan with the IRS if you cannot pay in full. Or you can ask Social Security to withhold federal income tax from your monthly benefit payment, which spreads the tax across the year instead of paying it all at once.

To request withholding, you fill out 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 benefit withheld each month. Many people choose this option because it prevents a large tax bill at filing time and reduces the chance of underpayment penalties.

If you did not withhold and owe tax, you may also owe estimated tax penalties if you did not pay enough tax during the year. The IRS calculates these based on your income and filing status. If your tax situation is complicated, a tax professional can help you figure out the right withholding amount or payment plan.

When you might owe state tax on benefits

Thirteen states tax Social Security benefits to some degree. Colorado, Connecticut, Kansas, Minnesota, Missouri, Montana, Nebraska, New Mexico, Rhode Island, Utah, and Vermont tax benefits using a formula similar to the federal one. Illinois and Mississippi tax only benefits paid to residents over a certain age or income level.

The other 37 states do not tax Social Security at all. If you live in a state that does tax benefits, you will need to report your benefits on your state return and calculate state tax using your state's rules. Some states use the same combined income thresholds as the federal government; others use different ones. A few states allow a deduction or credit for Social Security income.

If you moved to a new state during the year, you may owe tax to both your old state and your new state, depending on when you moved and each state's rules. Your state tax authority website has worksheets and instructions specific to your situation.

Planning ahead to reduce taxes on benefits

If you are not yet receiving Social Security, you can plan the timing of other income to stay below the combined income threshold. Delaying Social Security by even one year reduces the amount you receive annually, but it also means you have fewer years of combined income that might push you over the threshold. This is a long-term decision that depends on your health, life expectancy, and other sources of income.

If you are already receiving benefits, you may be able to reduce combined income by managing when you take withdrawals from retirement accounts. Traditional IRA withdrawals count as income; Roth IRA withdrawals do not. Timing large withdrawals or charitable donations can sometimes keep you below the threshold in a given year.

If you have investment income, you might reduce it by shifting money into tax-exempt bonds or by harvesting losses to offset gains. These strategies are most useful if your combined income is close to a threshold. If you are well over the threshold, the tax savings from these moves may not be worth the effort.

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 you are single, you do not have to file unless your combined income exceeds $14,250 (for 2023). If you are married filing jointly, the threshold is $28,500. However, filing may still be worth it if you are due a refund from taxes withheld or if you may have access to for a tax credit like the Earned Income Tax Credit.

What if I worked and paid Social Security taxes while receiving benefits?

Earnings from work count toward your combined income, so they may cause some of your benefits to become taxable. However, if you are still working and have not yet reached full retirement age, Social Security may also reduce your monthly benefit payment if your earnings exceed an annual limit. These are two separate rules. The earnings limit is higher than the combined income threshold, so you could owe tax on benefits even if your earnings do not trigger a benefit reduction.

Can I deduct the tax I pay on Social Security benefits?

No. The portion of your Social Security benefits that is taxable is included in your taxable income, but you cannot deduct the tax itself. The tax is calculated as part of your overall federal income tax, not as a separate line item you can reduce.

What if I received a lump-sum payment of back benefits?

A lump-sum payment of back benefits can push your combined income very high in a single year, making a large portion of your benefits taxable that year. The IRS allows you to use a special election called the "Simplified Method" or to spread the income over multiple years in some cases. Form SSA-1042 and IRS Publication 915 explain the options. A tax professional can help you figure out which method saves you the most tax.

Does my spouse's Social Security count toward my combined income?

No. Each person's combined income is calculated separately. Your spouse's benefits and income do not count toward your combined income threshold, even if you file jointly. However, if you file jointly, you use the married filing jointly thresholds ($32,000 and $44,000) rather than the single thresholds, which are lower.