Whether you pay federal tax on Social Security depends on your total income

You may owe federal income tax on part of your Social Security benefits if your income exceeds certain thresholds. The IRS uses a formula based on your "combined income" — which includes your wages, interest, dividends, and half of your Social Security benefits. If that combined income stays below the threshold for your filing status, you pay no tax on your benefits. If it goes above, you may owe tax on up to 85 percent of what you received.

The thresholds have not changed since 1984. For 2024, the first threshold is $25,000 for single filers and $32,000 for married couples filing jointly. These amounts do not adjust for inflation each year, which means more people cross them over time.

Key Takeaways

  • You calculate whether you owe tax using "combined income," which includes half your Social Security benefits plus all other income sources.
  • Single filers with combined income above $25,000 and married joint filers above $32,000 may owe tax on part of their benefits.
  • The IRS can withhold tax directly from your benefit payment if you request it, or you can pay estimated tax quarterly.
  • Some states do not tax Social Security benefits at all, while others follow federal rules or have their own thresholds.

How the IRS calculates combined income

Combined income is not the same as your adjusted gross income (AGI). To find your combined income, start with your AGI, add back certain deductions (like the student loan interest deduction), and then add half of your Social Security benefits. That total is what the IRS uses to determine whether you cross a tax threshold.

For example, if you received $20,000 in Social Security and had $10,000 in pension income, your combined income would be at least $20,000 (the pension) plus $10,000 (half your benefits) = $30,000. If you are single, that puts you $5,000 over the $25,000 threshold, so part of your benefits become taxable.

The two-tier tax formula

The IRS uses two separate income thresholds to determine how much of your benefits are taxable. The first tier applies to income between the initial threshold and a second, higher threshold. The second tier applies to income above that.

For single filers in 2024, the first tier runs from $25,000 to $34,000, and the second tier starts at $34,000. For married couples filing jointly, the first tier runs from $32,000 to $44,000, and the second tier starts at $44,000. If your combined income falls in the first tier, up to 50 percent of your benefits may be taxable. If it falls in the second tier, up to 85 percent may be taxable.

The actual calculation involves multiplying the amount you exceed each threshold by a percentage and comparing the results. The IRS worksheet in Publication 915 walks through the steps, or you can use tax software that does the calculation automatically.

How to handle tax withholding on your benefits

If you expect to owe tax on your benefits, you have two main options: request that the Social Security Administration withhold tax from your monthly payment, or pay estimated tax to the IRS quarterly.

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 10, 15, 25, or 35 percent of your benefit withheld. This is simpler than estimated tax payments because the withholding happens automatically each month.

If you prefer to pay estimated tax instead, you file Form 1040-ES with the IRS quarterly (usually in April, June, September, and January). This route gives you more control but requires you to calculate and send payments on your own schedule.

State tax rules vary widely

Thirteen states tax Social Security benefits in some form, while 37 states do not tax them at all. The states that do tax benefits are 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, which may differ from federal thresholds.

If you live in one of these states, you may owe state tax on your benefits even if you owe no federal tax, or vice versa. Check your state's tax agency website or contact them directly to learn the specific rules for your situation.

What to do if you did not withhold and now owe tax

If you did not request withholding and discover at tax time that you owe federal tax on your benefits, you can still file your return and pay what you owe. The IRS does not penalize you for owing tax on Social Security benefits specifically — you straightforward report the taxable portion on your 1040 and pay the amount due.

If you owe a large amount and cannot pay in full, the IRS offers payment plans. You can set up a short-term plan (120 days or less) at no cost, or a long-term installment agreement with a setup fee. Going forward, you can request withholding on Form W-4V to avoid a similar situation next year.

Frequently Asked Questions

Can I reduce my combined income to avoid owing tax on benefits?

You can reduce your combined income by lowering other sources of income — for example, by deferring bonuses, delaying the sale of investments, or timing retirement account withdrawals. However, you cannot exclude or reduce your Social Security benefits themselves from the calculation. Some people work with a tax professional to time income strategically in years when they cross a threshold.

What if I work and receive Social Security at the same time?

Your wages count as income in the combined income formula, so working while receiving benefits can push you over a tax threshold. Additionally, if you are under full retirement age and earn above a certain amount, Social Security reduces your monthly benefit — separate from the tax question. The earnings limit and the tax threshold are two different rules.

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

If Social Security is your only income and the taxable portion is below the filing threshold for your age and status, you do not have to file. However, if you had tax withheld, filing a return may get you a refund. Use the IRS interactive tool on IRS.gov to determine whether you must file.

Will my Medicare premiums go up if I owe tax on my benefits?

Your Medicare Part B and Part D premiums are based on your modified adjusted gross income (MAGI) from two years prior, not on whether you owe tax on your benefits. However, MAGI includes half your Social Security benefits, so receiving more in benefits can increase your premiums. This is a separate calculation from federal income tax.