Medicare tax withholding explained

Medicare tax withholding is money your employer takes from your paycheck to fund Medicare, the federal health insurance program for people 65 and older. The amount withheld is a percentage of your gross wages — it comes out before you see your pay. You do not get to choose whether this happens; it is required by law for nearly all workers in the United States.

The withholding rate is 1.45 percent of your wages. If you earn $50,000 a year, your employer withholds $725 to Medicare. Your employer also pays a matching 1.45 percent on your behalf, which you do not see but which counts toward your Medicare may be able to access later. Together, these two amounts — employee and employer — make up the total Medicare tax.

There is also an additional Medicare tax of 0.9 percent that applies if your income exceeds a certain threshold. For single filers, that threshold is $200,000 per year. For married couples filing jointly, it is $250,000. If you cross that line, your employer withholds the extra 0.9 percent on wages above the threshold. Unlike the base 1.45 percent, your employer does not match the additional tax.

Key Takeaways

  • Medicare tax withholding is 1.45 percent of your wages, taken from every paycheck by your employer.
  • Your employer also pays 1.45 percent on your behalf, though you do not see this amount deducted from your pay.
  • An additional 0.9 percent Medicare tax applies to wages over $200,000 (single) or $250,000 (married filing jointly) per year.
  • Self-employed workers pay both the employee and employer portions themselves, totaling 2.9 percent of net earnings.
  • Medicare tax withholding is separate from federal income tax withholding and Social Security tax.

How Medicare tax differs from other payroll taxes

Your paycheck has three main taxes withheld: federal income tax, Social Security tax, and Medicare tax. They are separate and work differently. Federal income tax depends on how much you earn and what you claim on your W-4 form. Social Security tax is 6.2 percent of wages up to a yearly cap (the cap changes each year). Medicare tax is 1.45 percent with no cap — you pay it on every dollar you earn, no matter how much you make.

This matters because once you hit the Social Security wage cap, you stop paying Social Security tax for the rest of that year. But you keep paying Medicare tax on every paycheck. In 2024, the Social Security cap was $168,600, meaning high earners paid Social Security tax only on the first $168,600 of their wages. They continued paying Medicare tax on everything above that.

Self-employed workers and Medicare tax

If you are self-employed, you pay both the employee and employer portions of Medicare tax yourself. That means you pay 2.9 percent of your net earnings to Medicare, not 1.45 percent. You also pay the additional 0.9 percent if your income exceeds the threshold for your filing status.

Self-employed workers report this tax on Schedule SE (Self-Employment Tax) when they file their tax return. You can deduct half of your self-employment tax as a business expense on your return, which lowers your taxable income slightly. But you still owe the full amount.

Where Medicare tax money goes

Medicare tax funds the Hospital Insurance Trust Fund, which pays for Medicare Part A benefits. Part A covers inpatient hospital stays, skilled nursing facility care, hospice, and some home health services. The money you and your employer pay now goes into a pool that pays for current beneficiaries' care. When you turn 65 and become may be able to access for Medicare, your Part A coverage is funded partly by taxes current workers are paying.

This is different from Medicare Parts B, D, and supplemental coverage, which are funded through general federal revenue, beneficiary premiums, and other sources. Medicare tax specifically supports Part A.

What happens to Medicare tax on your tax return

Medicare tax withholding appears on your W-2 form in Box 6. When you file your tax return, the amount withheld is already accounted for — you do not claim it as a deduction or credit. It is straightforward a record of what was taken from your pay during the year.

If you overpaid Medicare tax — for example, because you worked for two employers and both withheld on wages that crossed the additional Medicare tax threshold — you can claim the overpayment as a credit on your return. This situation is uncommon but can happen. You would report it on Form 8959 (Additional Medicare Tax).

Medicare tax for high earners and the additional tax

The additional 0.9 percent Medicare tax was added in 2013 as part of the Affordable Care Act. It applies only to wages above the threshold for your filing status. If you are single and earn $220,000, you pay the additional tax only on the $20,000 above $200,000 — that is $180 in additional Medicare tax for the year.

Your employer is responsible for withholding this tax, but they may not always get it right if you have multiple jobs or if your income varies. If you think you have overpaid, you can claim the excess on your tax return. If you think you will owe additional Medicare tax but your employer has not withheld it, you may need to make estimated tax payments to avoid a penalty.

Frequently Asked Questions

Can I opt out of Medicare tax withholding?

No. Medicare tax withholding is required by law for all employees and self-employed workers. There is no exemption based on age, income, or religious belief. If you are working and earning wages, Medicare tax is withheld.

Does Medicare tax withholding count toward my Medicare benefits?

Yes. You earn Medicare Part A coverage by paying Medicare tax for a certain number of quarters (three-month periods). Most people need 40 quarters of earnings to may have access to for free Part A at age 65. The tax you pay now contributes to that requirement.

What if I worked in another country — does that count toward Medicare?

It depends on the country and the tax treaty between that country and the United States. Some countries have agreements that allow work credits to count toward Medicare may be able to access. You would need to contact Social Security to find out whether your foreign earnings count.

Why do I owe additional Medicare tax if my employer did not withhold it?

If you have multiple jobs or your income is irregular, your employers may not know your total yearly earnings. Each employer withholds based only on what they pay you. If your combined income crosses the threshold, you owe the additional tax even if no single employer withheld it. You report this on your tax return.

Is Medicare tax the same as Medicare premiums?

No. Medicare tax is what you pay while working. Medicare premiums are what you pay after you turn 65 and enroll in Medicare. Premiums cover Part B (doctor visits), Part D (prescription drugs), and other optional coverage. Your Medicare tax withholding does not pay your future premiums.