Yes, the IRS taxes Social Security benefits for many people

The federal government taxes Social Security income for roughly 40 percent of beneficiaries. Whether you pay tax on your benefits depends on your total income for the year, not just what you receive from Social Security. The IRS uses a formula called combined income to decide how much of your benefit is taxable.

Combined income means your adjusted gross income plus nontaxable interest plus half of your Social Security benefits. If your combined income exceeds certain thresholds, you owe federal income tax on a portion of what you received. The thresholds have not changed since 1984, which is why more people are affected now than when the rule began.

State taxes are separate. Some states tax Social Security; most do not. The states that do tax it are Colorado, Connecticut, Kansas, Minnesota, Missouri, Montana, Nebraska, New Mexico, Rhode Island, Utah, and Vermont. Each state uses its own rules, so you need to check your state's tax authority website if you live in one of these places.

Key Takeaways

  • You owe federal tax on Social Security only if your combined income (adjusted gross income plus half your benefits) exceeds $25,000 as a single filer or $32,000 as a married couple filing jointly.
  • If you are over the threshold, the IRS taxes up to 85 percent of your benefits, but most people pay tax on a smaller portion.
  • Eleven states tax Social Security benefits under their own rules; the other 39 states do not.
  • Social Security itself does not automatically withhold taxes; you must request withholding or make quarterly estimated payments to avoid a bill at tax time.
  • Withdrawals from retirement accounts, part-time work income, and investment gains all count toward your combined income and can push you over the tax threshold.

The income thresholds that trigger taxation

The federal tax threshold depends on your filing status. For a single filer, combined income over $25,000 means some of your benefits are taxable. For married couples filing jointly, the threshold is $32,000. For married people filing separately, the threshold is $0 — meaning almost all of your benefits are taxable if you file that way.

These thresholds have remained the same since 1984. Because they do not adjust for inflation, more beneficiaries cross them each year. A person earning $25,000 in 1984 would need to earn roughly $70,000 in today's dollars to have the same purchasing power, but the threshold stayed at $25,000.

Combined income includes wages, self-employment income, pensions, interest, dividends, capital gains, and distributions from retirement accounts like IRAs and 401(k)s. It also includes half of your Social Security benefit itself. This means even if you have no other income, half your benefit counts toward the threshold.

How much of your benefit becomes taxable

The tax calculation is not straightforward. If your combined income is between $25,000 and $34,000 (single) or $32,000 and $44,000 (married filing jointly), you pay tax on up to 50 percent of your benefits. If your combined income exceeds $34,000 (single) or $44,000 (married filing jointly), you pay tax on up to 85 percent of your benefits.

The actual percentage depends on how far over the threshold you are. Most people who are taxed pay tax on somewhere between 50 and 85 percent of their benefits, not the full amount. The IRS worksheet in Publication 915 walks through the exact calculation, but a tax professional can compute this for you if the math feels unclear.

Example: A single person with $30,000 in combined income is $5,000 over the first threshold. The IRS taxes 50 percent of the amount over $25,000 (which is $2,500) plus 35 percent of the amount over $34,000 (which is $0 in this case). So roughly $2,500 of their benefit is taxable, not the full benefit.

Social Security does not automatically withhold taxes

Unlike a paycheck, Social Security does not automatically remove federal income tax from your monthly payment. You have two options: request tax withholding from your benefit, or make quarterly estimated tax payments to the IRS on your own.

To request withholding, fill out Form W-4V and send it to your local Social Security office or submit it online through your my Social Security account. You can choose to have 7, 10, 12, or 22 percent of your benefit withheld. Most people choose 10 or 12 percent. You can change your withholding amount at any time.

If you do not request withholding and you owe tax, you will receive a bill from the IRS when you file your return. You can then pay it in full or set up a payment plan. Some people prefer to make quarterly estimated payments instead of having Social Security withhold, especially if their tax situation is complex.

How retirement account withdrawals affect your tax bill

If you withdraw money from a traditional IRA or 401(k), that withdrawal counts as income and goes into your combined income calculation. This can push you over the tax threshold even if your Social Security benefit alone would not have triggered taxation.

A common scenario: a person retires at 62, starts taking Social Security, and also begins withdrawing from their IRA to cover living expenses. The IRA withdrawal counts toward combined income, which means more of the Social Security benefit becomes taxable. The person may owe more tax than they expected.

Roth IRA withdrawals work differently. may have access to distributions from a Roth IRA do not count as income and do not affect your combined income calculation. This is one reason some people convert traditional IRAs to Roth accounts before they start taking Social Security.

State taxes on Social Security benefits

Colorado, Connecticut, Kansas, Minnesota, Missouri, Montana, Nebraska, New Mexico, Rhode Island, Utah, and Vermont tax Social Security benefits. Each state has its own rules about which beneficiaries pay tax and how much.

Some states exempt beneficiaries below a certain age or income level. Others tax all benefits the same way the federal government does. A few states tax benefits but then offer a credit or deduction that reduces or eliminates the tax for most people. You need to check your state's tax authority website or speak with a tax professional in your state to understand your specific situation.

If you live in a state that taxes Social Security and you owe state tax, you can request state tax withholding using Form W-4V as well. The withholding amount is separate from federal withholding.

What to do if you think you will owe tax on benefits

Start by calculating your estimated combined income for the year. Add your adjusted gross income, nontaxable interest, and half your Social Security benefit. If the total exceeds the threshold for your filing status, some of your benefit is taxable.

Request federal tax withholding from Social Security by submitting Form W-4V to your local office or through your my Social Security account. Choose a withholding percentage that covers your expected tax bill. If you are unsure what percentage to choose, a tax professional can help you estimate.

Keep records of all income sources throughout the year — W-2s from work, 1099s from investments or self-employment, IRA and 401(k) statements, and your Social Security benefit statement. When you file your tax return, you will need these documents to report your income accurately.

Frequently Asked Questions

Can I avoid paying tax on Social Security by keeping my income low?

You can reduce the amount of your benefit that is taxable by keeping your combined income below the threshold, but combined income includes half your Social Security benefit itself. So even with no other income, half your benefit counts toward the threshold. Most people cannot avoid taxation entirely unless their benefit is very small.

What if I did not request withholding and now owe a large tax bill?

You can request withholding retroactively starting the next month. You can also set up a payment plan with the IRS if you cannot pay the full amount at once. Contact the IRS or speak with a tax professional about your options.

Does working part-time while taking Social Security increase my taxes?

Yes. Wages from part-time work count as income and go into your combined income calculation. This can push you over the tax threshold and make more of your Social Security benefit taxable. There is also an earnings limit if you are under full retirement age, which reduces your benefit if you earn above a certain amount.

Are Medicare premiums affected by Social Security taxation?

No, but they are affected by your combined income in a different way. If your combined income is high, you pay higher Medicare Part B and Part D premiums. This is separate from income tax on Social Security benefits.

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

Not necessarily. If your only income is Social Security and it is below the filing threshold for your age and filing status, you do not have to file. However, if you had taxes withheld, you should file to get a refund.