Social Security and Medicare do not directly change your tax bracket, but they can push you into a higher one

Your tax bracket is determined by your total income for the year. Social Security benefits and Medicare premiums are treated differently by the IRS, and understanding how matters because they can affect how much federal income tax you owe.

Social Security is partially taxable — meaning some or all of your benefits count as income for tax purposes, depending on your other income. Medicare premiums, on the other hand, are deducted from your Social Security check before you receive it, so they do not add to your taxable income. The key is that Social Security can push you into a higher bracket even though Medicare does not.

Key Takeaways

  • Social Security benefits are partially taxable and can count toward your total income, which may move you into a higher tax bracket.
  • Medicare Part B and Part D premiums are deducted from your Social Security payment before you receive it and do not increase your taxable income.
  • You may owe federal income tax on Social Security even if you did not work that year, depending on your total income from all sources.
  • The IRS uses a formula called "combined income" to determine how much of your Social Security is taxable, not your tax bracket alone.

How Social Security counts toward your taxable income

The IRS counts up to 85 percent of your Social Security benefits as taxable income. Whether any of your benefits are taxed depends on your combined income, which is your adjusted gross income plus non-taxable interest plus half of your Social Security benefits.

If your combined income exceeds certain thresholds, you will owe federal income tax on a portion of your benefits. For 2024, those thresholds are $25,000 for single filers and $32,000 for married couples filing jointly. If you are married filing separately, the threshold is $0 — meaning any combined income at all can trigger taxation of benefits.

This means you could have very little income from work or pensions, but if your Social Security is high enough, you will still have taxable income. That taxable income then determines which tax bracket you fall into.

Medicare premiums and how they reduce your Social Security check

Most people on Medicare have their Part B premium deducted directly from their Social Security payment each month. In 2024, the standard Part B premium is $164.90 per month, though higher earners pay more through Income-Related Monthly Adjustment Amounts (IRMAA).

Because Medicare premiums come out before you receive your Social Security check, they do not count as taxable income. The IRS does not tax the money that never reaches your hand. However, the full amount of your Social Security benefit — before the Medicare deduction — is what the IRS uses to calculate how much of your benefits are taxable.

If you are not yet on Medicare or you pay your premiums separately, the same rule applies: the premiums themselves are not deductible from your taxable income, but they also do not add to it.

When you might owe taxes on Social Security

You may owe federal income tax on your Social Security even if it is your only income source. This happens when your combined income exceeds the IRS thresholds. For example, a single person with $20,000 in Social Security and $10,000 in pension income has a combined income of $30,000 (the pension plus half the Social Security). That exceeds the $25,000 threshold, so some benefits become taxable.

Other income that counts toward combined income includes wages, interest, dividends, rental income, and distributions from retirement accounts like IRAs or 401(k)s. Even small amounts of income from part-time work can push you over the threshold.

You do not automatically owe taxes just because you receive Social Security. The IRS will not withhold taxes unless you ask them to. Many people request tax withholding from their Social Security payment to avoid owing a large bill at tax time.

How to request tax withholding from your Social Security

If you think you will owe taxes on your Social Security, you can have the Social Security Administration withhold federal income tax from your monthly benefit. You do this by completing Form W-4V and submitting it to your local Social Security office or mailing it to the address on the form.

On the form, you choose a withholding rate: 7 percent, 10 percent, 15 percent, or 25 percent of your benefit. You can change your withholding rate at any time by submitting a new form. Some people choose to withhold enough to cover their estimated tax bill, while others withhold a smaller amount and pay the rest when they file their return.

If you do not request withholding and you owe taxes, you may also pay estimated taxes directly to the IRS four times per year using Form 1040-ES.

State taxes and Social Security

Most states do not tax Social Security benefits, but a few do. The states that tax Social Security are Colorado, Connecticut, Kansas, Minnesota, Missouri, Montana, Nebraska, New Mexico, Rhode Island, Utah, and Vermont. The rules vary by state — some tax all benefits, while others only tax benefits for higher-income retirees.

If you live in one of these states, you may want to request state tax withholding as well. You can do this on Form W-4V by checking the box for state withholding, or you can contact your state tax authority for instructions.

Questions to ask your tax preparer or the IRS

Because Social Security taxation depends on your specific situation, it helps to talk through your numbers with someone who understands the rules. Ask your tax preparer or call the IRS at 1-800-829-1040 to clarify:

  • Whether any of your Social Security benefits will be taxable based on your other income sources.
  • Whether you should request tax withholding from your Social Security payment.
  • How much you should withhold if you choose to do so.
  • Whether your state taxes Social Security and what you need to do about it.

Frequently Asked Questions

Does Medicare Part D premium affect my tax bracket?

No. Like Part B, Part D premiums are deducted from your Social Security before you receive it, so they do not add to your taxable income. However, if you pay Part D premiums separately (not through Social Security), they still do not count as a tax deduction for most people.

If I have no other income, do I owe taxes on Social Security?

Not usually. If Social Security is your only income source, your combined income will be below the IRS threshold for most people, so your benefits will not be taxable. However, if you have even small amounts of interest, dividends, or other income, you may cross the threshold.

Can I deduct my Medicare premiums from my taxes?

Medicare premiums are generally not tax-deductible. However, if you are self-employed and pay for your own health insurance (including Medicare premiums in some cases), you may be able to deduct the premiums as a business expense. Ask your tax preparer about your specific situation.

What happens if I do not withhold taxes and owe money at tax time?

You will owe the full amount when you file your return. You may also owe penalties and interest if you underpaid significantly. To avoid this, you can request withholding on Form W-4V or pay estimated taxes throughout the year.

Does my tax bracket change if I delay claiming Social Security?

Your tax bracket itself does not change, but your taxable income will be higher once you start receiving benefits. Delaying Social Security increases your monthly benefit amount, which means higher combined income and potentially more of your benefits being taxable when you do claim.