Whether your Social Security is taxed depends on your other income

Social Security benefits themselves are never taxed by the federal government unless you have income from other sources. The IRS uses a formula called combined income to decide if any of your benefit is taxable. Combined income means your adjusted gross income plus nontaxable interest plus half of your Social Security benefit for the year.

If your combined income stays below a certain threshold, you pay no federal tax on your benefits. If it goes above that threshold, between 50% and 85% of your benefits become taxable income. The exact percentage depends on how far above the threshold you are. State taxes work differently — some states tax Social Security, others do not, and the rules vary widely.

The thresholds have not changed since 1984, which means more people cross them each year as wages and benefits rise. A married couple filing jointly with combined income over $32,000 will owe tax on some benefits. A single filer with combined income over $25,000 faces the same result. Married people filing separately almost always owe tax on their benefits.

Key Takeaways

  • Combined income — your other income plus half your Social Security benefit — determines whether you owe federal tax on your benefits.
  • Single filers with combined income over $25,000 and married filers over $32,000 will owe tax on between 50% and 85% of their benefits.
  • Withdrawals from traditional IRAs and 401(k)s count as income for this calculation, even if you do not need the money.
  • State tax rules vary: some states tax Social Security, some do not, and a few tax it only for higher-income residents.
  • You can ask the Social Security Administration to withhold federal tax from your monthly benefit to avoid a large bill at tax time.

How the IRS calculates your combined income

Combined income is the starting point for the entire calculation. Add your adjusted gross income (the number from your tax return after deductions like educator expenses or student loan interest), plus any nontaxable interest you earned, plus half of your Social Security benefit for the year. That total is your combined income.

The sources that count toward combined income include wages, self-employment income, pensions, rental income, capital gains, and distributions from retirement accounts. Withdrawals from a traditional IRA or 401(k) count in full, even if you withdrew the money because you needed it for living expenses and did not want to. Roth IRA withdrawals of contributions do not count, but Roth conversions do. Interest from municipal bonds normally does not count as taxable income, but it does count toward your combined income threshold.

Some income sources do not count. Supplemental Security Income (SSI), Veterans benefits, workers' compensation, and life insurance proceeds do not raise your combined income. Neither do gifts or inheritances. If you are still working, your wages count in full, regardless of your age.

The two-tier tax formula and what percentage of your benefits is taxable

Once you know your combined income, the IRS applies a two-step formula. The first tier taxes up to 50% of your benefits. The second tier taxes up to an additional 35%, for a maximum of 85% of your benefits.

For single filers: if your combined income is between $25,000 and $34,000, up to 50% of your benefits is taxable. If it is over $34,000, up to 85% is taxable. For married couples filing jointly: the first threshold is $32,000 and the second is $44,000. For married people filing separately, the thresholds are $0 and $0 — meaning almost all of your benefits are taxable if you file separately.

The actual calculation is complex because it involves taking the lesser of two amounts at each tier. Most people use tax software or a tax preparer to work through it. The Social Security Administration publishes a worksheet in Publication 915 if you want to calculate it by hand, but the math requires careful attention to order of operations.

State taxes on Social Security benefits

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 differ in each state.

Some states follow the federal formula closely. Others tax benefits only for residents above a certain income level, or only for residents over a certain age. Colorado, for example, taxes benefits for residents under 55 but exempts them for residents 55 and older. Kansas taxes benefits but allows a deduction that phases out at higher incomes. Montana taxes benefits but offers a credit that reduces the tax owed.

If you live in a state that taxes benefits, you will need to file a state return even if your federal tax is zero. Contact your state tax authority or a tax preparer familiar with your state's rules to understand what you owe. The rules change occasionally, so checking with your state directly is more reliable than relying on information from previous years.

Withholding tax from your Social Security check

If you know you will owe tax on your benefits, you can ask the Social Security Administration to withhold federal income tax from your monthly payment. This prevents a large bill when you file your tax return and spreads the tax cost across the year.

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 choose to withhold 7%, 10%, 15%, or 22% of your benefit. You can change your withholding amount or stop withholding at any time by submitting a new form.

Withholding is voluntary, and you do not have to do it. But if you have other income and expect to owe tax, withholding can make tax time simpler. If you withhold too much, you will get a refund when you file. If you withhold too little, you will owe when you file.

What happens if you work while receiving Social Security

If you are under your full retirement age and still working, the Social Security Administration reduces your benefit by $1 for every $2 you earn above an annual limit. In 2024, that limit is $23,400, but it changes each year. The reduction applies only in the year you reach full retirement age and only to earnings before the month you reach that age.

These withheld benefits still count toward your combined income for tax purposes. So earning wages while receiving benefits can push you over the threshold and make your benefits taxable, even though Social Security is reducing your payment. Once you reach full retirement age, there is no earnings limit and no reduction, but your combined income may still be high enough to trigger taxation.

Planning ahead to reduce taxes on your benefits

If you are not yet receiving Social Security but expect to have other income in retirement, you have some options. Delaying Social Security increases your monthly benefit by about 8% per year between your full retirement age and 70, which means a higher benefit but also higher combined income. Working longer or drawing down savings before you claim can shift when income appears on your tax return.

Roth conversions — moving money from a traditional IRA to a Roth IRA — increase your income in the conversion year and may push you over the Social Security tax threshold. But after the conversion, Roth withdrawals do not count toward combined income, which can lower your tax burden in later years. This strategy requires careful timing and usually benefits from working with a tax professional.

If you have substantial nontaxable interest from municipal bonds, remember that it still counts toward your combined income threshold. Shifting to taxable bonds or other investments might lower your tax on benefits, depending on your overall situation.

Frequently Asked Questions

Can I reduce my Social Security tax by not withdrawing from my IRA?

No. IRA withdrawals count toward combined income only when you actually withdraw the money. If you do not need the money and do not withdraw it, it does not affect your Social Security tax. But if you must withdraw for living expenses or are subject to required minimum distributions, those withdrawals will count.

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

No, not for federal tax purposes if your combined income is below the threshold. However, some states that tax Social Security require a state return even if you owe no federal tax. Check your state's rules or contact your state tax authority.

What if I made a mistake on my tax return and did not report all my Social Security income?

Contact the IRS or a tax professional to file an amended return (Form 1040-X). The longer you wait, the more interest and penalties may accumulate. The IRS can also contact you if they discover the error during an audit.

Does my spouse's income affect whether my Social Security is taxed?

Only if you file jointly. If you file jointly, your combined incomes are added together to determine the threshold. If you file separately, each person's income is calculated independently, but married people filing separately almost always owe tax on their benefits.

If I am still working, does my employer withhold Social Security tax on my benefits?

No. Your employer withholds income tax and payroll taxes from your wages, but Social Security benefits are separate. You must request withholding on your benefits separately using Form W-4V if you want tax withheld from your monthly check.