Medicare tax funds the health insurance program for people 65 and older

Medicare tax is a payroll deduction that goes toward the federal health insurance program for seniors, people with disabilities, and people with end-stage renal disease. Your employer withholds this tax from your paycheck, and you contribute a percentage of your wages. The money does not sit in a personal account with your name on it — it goes into a shared federal fund that pays for hospital stays, doctor visits, and prescription drugs for the roughly 67 million people enrolled in Medicare.

The tax exists because Congress created Medicare in 1965 as a way to pool resources so that older Americans would not have to pay the full cost of their medical care out of pocket. The program is funded partly by payroll taxes (the money you pay now), partly by premiums that Medicare enrollees pay monthly, and partly by general federal revenue. Without the payroll tax, the program would not have enough money to pay hospitals and doctors for the care they provide.

Key Takeaways

  • You pay Medicare tax on every dollar you earn, with no income cap, so high earners pay more total tax than lower earners.
  • The standard Medicare tax rate is 2.9 percent of your wages — your employer withholds 1.45 percent and you pay 1.45 percent.
  • If you earn over $200,000 as a single filer (or $250,000 married filing jointly), you pay an additional 0.9 percent Medicare tax on the amount above that threshold.
  • Medicare tax is separate from Social Security tax and income tax, though all three appear on your paycheck stub.
  • Self-employed people pay both the employee and employer portions of Medicare tax, totaling 2.9 percent plus the additional 0.9 percent if income exceeds the threshold.

How much Medicare tax you pay depends on your income

The standard Medicare tax rate is 2.9 percent of your gross wages. Your employer withholds 1.45 percent from your paycheck, and your employer pays the other 1.45 percent directly to the federal government on your behalf. If you earn $50,000 a year, you pay $725 in Medicare tax. If you earn $100,000, you pay $1,450.

Unlike Social Security tax, which stops once you reach a certain income threshold ($168,600 in 2024, though this changes yearly), Medicare tax has no cap. You pay it on every dollar you earn, no matter how much you make. This means a person earning $500,000 pays Medicare tax on all $500,000, not just the first portion.

If your income exceeds $200,000 as a single filer, or $250,000 if you are married filing jointly, you pay an additional 0.9 percent Medicare tax on the amount above that threshold. This extra tax was added in 2013 as part of the Affordable Care Act. A single person earning $220,000 would pay the standard 2.9 percent on all wages, plus an extra 0.9 percent on the $20,000 above the $200,000 threshold — an additional $180 in tax.

Your employer pays half, but it still comes from your compensation

The way payroll taxes are split can feel confusing: you see 1.45 percent withheld from your paycheck, and your employer pays another 1.45 percent. It might look like your employer is paying "extra" on top of your salary, but economists generally agree that the employer portion is really part of your total compensation — money that could otherwise go to you as wages.

From a practical standpoint, the split does not change how much Medicare tax funds the program. The total is still 2.9 percent of your wages (or 3.8 percent if you are above the income threshold). The split exists partly for administrative reasons — it makes the payroll system simpler — and partly for political reasons. Showing the tax split makes the employee portion look smaller than it actually is.

Medicare tax is separate from Social Security and income tax

Your paycheck stub shows three separate deductions: federal income tax, Social Security tax, and Medicare tax. Many people confuse these because they all come out of the same paycheck, but they fund different programs and have different rules.

Social Security tax is 6.2 percent of your wages (up to the annual income cap), and it funds the retirement, disability, and survivor benefits program. Income tax is withheld based on the W-4 form you fill out with your employer, and the amount depends on your filing status, dependents, and other income. Medicare tax is 2.9 percent with no income cap, plus the additional 0.9 percent if you earn above the threshold. All three are mandatory federal payroll taxes, but they support different programs and have different rules about income limits and rates.

Self-employed people pay both the employee and employer share

If you are self-employed, you pay the full 2.9 percent Medicare tax yourself — both the employee portion and the employer portion that a regular employer would pay. This means self-employed Medicare tax is 2.9 percent, not 1.45 percent. If you earn over the income threshold, you also pay the additional 0.9 percent on the amount above it.

Self-employed people report this tax on Schedule SE (Self-Employment Tax) when they file their annual tax return. You can deduct half of your self-employment tax as a business expense, which reduces your taxable income slightly, but you still owe the full amount. Many self-employed people set aside money each quarter to cover this tax, since it is not automatically withheld from their income the way it is for regular employees.

The money goes to pay current Medicare beneficiaries, not into a savings account for you

Medicare is a pay-as-you-go system, not a savings account. The Medicare tax you pay today goes directly to pay for hospital care, doctor visits, and other services for people who are currently enrolled in Medicare. When you turn 65 and enroll in Medicare, your benefits will be paid for by the Medicare taxes that younger workers are paying at that time.

This is different from a pension or a 401(k), where your contributions are invested and saved for your own future use. With Medicare, you are funding a shared insurance pool. The amount you paid in Medicare tax over your working years does not determine how much you can spend on Medicare benefits once you are enrolled. Your benefits are based on the services you use and the coverage you choose, not on how much tax you paid.

Medicare tax rates and income thresholds change over time

The standard Medicare tax rate of 2.9 percent has been in place since 1966, but the additional 0.9 percent tax on high earners was added in 2013. Congress can change these rates or thresholds, though it rarely does. The income threshold for the additional 0.9 percent tax ($200,000 for single filers, $250,000 for married filers) does not adjust for inflation, so more people are affected by it each year as wages rise.

The Social Security income cap, by contrast, adjusts yearly based on wage growth. In 2024 it was $168,600, but it will be higher in 2025. Medicare has no such cap, so the tax applies to all your earnings no matter how high they go.

Frequently Asked Questions

Why do I pay Medicare tax if I am not 65 yet?

Medicare tax funds the program for all current beneficiaries — people 65 and older, people with disabilities, and people with end-stage renal disease. You pay now so that the program has money to pay for their care. When you turn 65, younger workers' Medicare taxes will pay for your benefits. It is a shared system, not a personal savings account.

Can I opt out of paying Medicare tax?

No. Medicare tax is mandatory for all employees and self-employed people. There is no religious or personal exemption the way there is for Social Security tax in some cases. If you are employed, your employer must withhold it. If you are self-employed, you must pay it when you file your tax return.

What happens to Medicare tax if I change jobs?

Your Medicare tax continues to be withheld from each paycheck, regardless of how many jobs you have. If you work two jobs in the same year, you pay Medicare tax on the income from both. Unlike Social Security tax, there is no annual limit, so you cannot overpay and get a refund if you change jobs multiple times.

Do I get a refund if I overpay Medicare tax?

You can only overpay the additional 0.9 percent Medicare tax if you have multiple employers and your combined wages exceed the threshold. In that case, you can claim a refund when you file your tax return. You cannot overpay the standard 2.9 percent because there is no income cap.

Is Medicare tax the same as Medicare premiums?

No. Medicare tax is the payroll tax you pay while working. Medicare premiums are monthly payments that people enrolled in Medicare pay for their coverage. When you turn 65 and enroll in Medicare, you will pay both: you may still pay Medicare tax if you are still working, and you will also pay monthly premiums for your Medicare coverage.