Social Security is taxable income, but only if your total income crosses a threshold

Whether you pay federal income tax on Social Security depends on your combined income — not just what Social Security sends you. The IRS counts half your Social Security benefit plus all your other income (wages, pensions, interest, dividends) to decide if any of your benefit is taxable. If that combined total stays below a set amount, you owe nothing on Social Security. If it goes above that amount, you may owe tax on up to 85 percent of your benefit.

The thresholds are the same whether you file single or married filing jointly, but married couples filing separately face a much lower threshold and almost always pay tax. These thresholds have not changed since 1984, which means more people cross them each year as wages and benefits rise.

Key Takeaways

  • You calculate combined income by adding half your Social Security benefit to all other income sources, then comparing that total to the IRS threshold for your filing status.
  • Single filers with combined income over $25,000 and married joint filers over $32,000 may owe tax on part of their Social Security.
  • The taxable portion is either 50 percent or 85 percent of your benefit, depending on how far your combined income exceeds the threshold.
  • State taxes on Social Security vary widely — some states tax it, some do not, and some exempt it only for residents over a certain age.

How the IRS calculates what portion of your benefit is taxable

The calculation uses two thresholds. The first threshold is $25,000 for single filers and $32,000 for married filing jointly. If your combined income is at or below this amount, none of your Social Security is taxable.

If your combined income exceeds the first threshold, you move to the second threshold: $34,000 for single filers and $44,000 for married filing jointly. Between the first and second threshold, up to 50 percent of your benefit becomes taxable. Above the second threshold, up to 85 percent of your benefit becomes taxable. The IRS worksheet on Form 1040 walks through this step by step, or a tax preparer can calculate it for you.

Example: A single filer receives $20,000 in Social Security and $15,000 in pension income. Combined income is $15,000 plus half of $20,000, which equals $25,000 — exactly at the threshold. No tax is owed. If that same person had $16,000 in pension income instead, combined income would be $26,000, and part of the Social Security becomes taxable.

The difference between 50 percent and 85 percent taxation

The amount of your benefit that gets taxed depends on how far above the thresholds you go. This is not a tax rate applied to the whole benefit — it is a limit on what portion can be taxed at your ordinary income tax rate.

If your combined income is between the first and second threshold, the IRS taxes the lesser of (a) 50 percent of your benefit, or (b) 50 percent of the amount by which your combined income exceeds the first threshold. If your combined income is above the second threshold, the calculation is more complex and can result in up to 85 percent of your benefit being taxable.

The actual tax you pay depends on your tax bracket. If you are in the 12 percent bracket and 50 percent of your $20,000 benefit is taxable, you would owe tax on $10,000 at 12 percent, which is $1,200. Someone in the 22 percent bracket would owe $2,200 on the same income.

State income tax on Social Security varies by where you live

Thirteen states tax Social Security income 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 tax it the same way the IRS does, others use different thresholds, and some exempt it for residents above a certain age.

Thirty-seven states do not tax Social Security at all. If you live in one of those states and your federal tax is zero, you owe nothing on your benefit. If you live in a state that taxes it, you will need to file a state return even if you do not owe federal tax.

Colorado, for example, taxes Social Security but allows a deduction based on age and income. Kansas taxes it but exempts it entirely for residents 55 and older. Missouri taxes it but exempts it for residents 59 and older. Check your state's department of revenue website for the exact rules where you live.

How to reduce the amount of Social Security that gets taxed

The most direct way to lower your tax on Social Security is to reduce your other income. If you have a choice about when to take a pension, when to sell investments, or when to claim a bonus, timing those events to keep your combined income below a threshold can save you thousands in tax.

Some people use a Roth conversion strategy: they convert money from a traditional IRA to a Roth IRA in a year when their income is low, pay tax on the conversion at a lower rate, and then take withdrawals from the Roth later without triggering Social Security taxation. This is complex and works only in specific situations, so talk to a tax preparer before attempting it.

Delaying Social Security also affects the calculation. If you wait to claim until 70 instead of 62, your monthly benefit is higher, but you have more years of other income (from work or pensions) before you start Social Security. The net effect on taxation depends on your specific situation.

What to do if you think you owe tax on Social Security

If you receive a Social Security statement and also have other income, use the IRS worksheet in the instructions for Form 1040 to calculate whether any of your benefit is taxable. You can do this yourself or ask a tax preparer to do it. The worksheet takes about ten minutes if you have your income documents in front of you.

If you owe tax, you can pay it when you file your return, or you can ask Social Security to withhold tax from your benefit. Form W-4V, "Voluntary Withholding Request," lets you choose to have 7, 10, 15, or 25 percent of your monthly benefit withheld for federal tax. You can change your withholding election at any time by submitting a new Form W-4V to your local Social Security office or by calling 1-800-772-1213.

Withholding does not change whether you owe tax — it just spreads the payment across the year instead of paying it all at once when you file. Some people prefer this to avoid a large bill in April.

Frequently Asked Questions

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

No. If Social Security is your only income and the amount is below the filing threshold for your age and filing status, you do not have to file. However, if you have other income, you must file even if none of your Social Security is taxable, because the IRS needs to see your total income to verify that.

What counts as income for the combined income calculation?

Wages, self-employment income, pensions, annuities, interest, dividends, capital gains, and rental income all count. Tax-exempt interest (such as from municipal bonds) also counts for this calculation, even though it is not taxable. Distributions from Roth IRAs do not count.

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

Delaying Social Security increases your monthly benefit, but it does not eliminate taxation. If you have other income in the years before you claim, that income still counts toward the threshold. Once you start Social Security, the same rules explore regardless of when you claimed.

If I live in a state that does not tax Social Security, do I still owe federal tax?

Yes. State tax and federal tax are separate. Living in a state with no Social Security tax saves you state tax only. You still owe federal tax if your combined income exceeds the federal threshold.

What if I made a mistake on my Social Security tax in a previous year?

You can file an amended return using Form 1040-X for any of the past three years. If you owe more tax, you will owe interest and possibly penalties. If you overpaid, you will receive a refund. A tax preparer or the IRS can help you file the amended return.