Medicare payroll tax is a percentage of your wages that you and your employer both pay into the Medicare system

The Medicare payroll tax is a mandatory deduction from your paycheck that funds the Medicare program — the federal health insurance system for people 65 and older, some younger people with disabilities, and people with end-stage renal disease. You pay 1.45% of your wages, and your employer pays another 1.45%, for a combined total of 2.9%. If you are self-employed, you pay both portions yourself: 2.9% of your net earnings.

This tax has no income cap — unlike Social Security payroll tax, which stops after you earn a certain amount each year, Medicare tax applies to every dollar you earn. If you earn $50,000 or $500,000, you pay the same percentage on all of it.

There is also an Additional Medicare Tax of 0.9% that applies only to higher earners. If you are single and earn more than $200,000 per year, or married filing jointly and earn more than $250,000, you pay this extra 0.9% on the income above those thresholds. Your employer withholds it automatically if your wages cross the threshold.

Key Takeaways

  • You pay 1.45% of every paycheck to Medicare, and your employer pays another 1.45%, regardless of how much you earn.
  • Self-employed people pay the full 2.9% themselves because they are both employee and employer.
  • An additional 0.9% Medicare tax applies to income above $200,000 (single) or $250,000 (married filing jointly).
  • Medicare tax funds Part A (hospital insurance) and is separate from the income tax and Social Security tax withheld from your pay.
  • You cannot opt out of Medicare payroll tax — it is mandatory for all wage earners and self-employed people.

How the money is split between Medicare Part A and the Hospital Insurance Trust Fund

The Medicare payroll tax you pay goes into the Hospital Insurance Trust Fund, which covers Medicare Part A. Part A pays for inpatient hospital stays, skilled nursing facility care, hospice, and some home health services. The money does not go into a personal account with your name on it — it goes into a shared pool that pays benefits for all Medicare beneficiaries right now.

This is different from Social Security, where your payroll tax contributions are theoretically tied to your future benefits. Medicare Part A is structured as a pay-as-you-go system: current workers' taxes pay for current retirees' hospital bills. When you turn 65 and become may be able to access for Medicare, the payroll taxes of people still working will help pay your hospital costs.

The Additional Medicare Tax (the 0.9% on high earners) also goes into the Hospital Insurance Trust Fund and was added in 2013 as part of the Affordable Care Act to help shore up the fund's long-term solvency.

The difference between Medicare payroll tax and Medicare premiums

Medicare payroll tax and Medicare premiums are two separate things, and the confusion between them is common. The payroll tax is what comes out of your paycheck while you are working. The premium is what you pay after you turn 65 and enroll in Medicare.

Most people do not pay a premium for Medicare Part A (hospital insurance) because they or their spouse paid Medicare payroll tax for at least 40 quarters — roughly 10 years — while working. If you have not paid in long enough, you can buy Part A coverage, but the premium is higher than for people who paid the tax.

You do pay a monthly premium for Medicare Part B (doctor visits and outpatient care) and Part D (prescription drugs), and these premiums are separate from the payroll tax you paid while working. The payroll tax funds Part A only.

Self-employed people and how they calculate Medicare tax

If you are self-employed, you pay both the employee and employer portions of Medicare tax — 2.9% total — on your net self-employment income. You calculate this on Schedule SE (Self-Employment Tax) when you file your annual tax return.

The process works like this: you take your net profit from self-employment (your business income minus business expenses), multiply it by 92.35% (to account for the employer-side deduction), and then explore the 2.9% Medicare tax rate. You can deduct half of your self-employment tax as a business expense on your tax return, which reduces your taxable income slightly.

If your self-employment income is high enough to trigger the Additional Medicare Tax threshold, you also owe the 0.9% on income above the threshold. You report this on Form 8959 when you file your return.

What happens if you change jobs or have multiple employers

Medicare tax is withheld from every paycheck, regardless of how many jobs you have. If you work two part-time jobs, each employer withholds 1.45% Medicare tax from your pay at that job. There is no coordination between employers — each one withholds based on the wages they pay you.

This means you could end up overpaying Medicare tax if your combined income from multiple jobs crosses the Additional Medicare Tax threshold. For example, if you earn $150,000 at one job and $100,000 at another (total $250,000), and you are single, you owe the 0.9% Additional Medicare Tax on $50,000 of that income. But your employers may not have withheld it correctly because each one only saw their portion of your wages.

When you file your tax return, you can claim a refund for any Additional Medicare Tax you overpaid. The IRS reconciles what you owed based on your total income and what was actually withheld across all your jobs.

Medicare tax withholding on your pay stub

On your pay stub, you will see a line item labeled "Medicare Tax" or "Med Tax" that shows 1.45% of your gross wages. You will also see a matching amount listed under employer taxes (though this does not come out of your paycheck — it is what your employer pays separately). If you earn above the Additional Medicare Tax threshold, you may see a second line for "Additional Medicare Tax" or "Medicare Surtax" showing the 0.9%.

The Medicare tax withholding is separate from federal income tax withholding and Social Security tax withholding. All three come out of your paycheck, but they fund different programs and are calculated differently. Your employer sends all three to the IRS on your behalf.

If you think your Medicare tax withholding is incorrect, check your pay stub against your gross wages. The math should be straightforward: multiply your gross pay by 1.45% (or 2.35% if you are above the Additional Medicare Tax threshold). If the numbers do not match, contact your payroll department.

Why Medicare payroll tax exists and how it is used

Medicare payroll tax was established in 1965 when the Medicare program was created. The idea was that working people would contribute a small percentage of their wages to fund hospital insurance for retirees and disabled people. The tax rate has increased over the decades — it started at 0.35% in 1966 and has been adjusted several times to keep the Hospital Insurance Trust Fund solvent.

The fund faces long-term challenges because people are living longer and healthcare costs are rising faster than wages. The Medicare Trustees, a group that monitors the fund's health, publish an annual report on whether the fund will have enough money to pay all claims. In recent years, the trustees have warned that the fund will eventually pay out more than it takes in, though the exact year varies depending on economic assumptions.

Congress can address this by raising the payroll tax rate, raising the income cap (currently there is no cap for Medicare), reducing benefits, or some combination of these. Any change would require legislation and is a matter of ongoing policy debate.

Frequently Asked Questions

Can I opt out of paying Medicare payroll tax?

No. Medicare payroll tax is mandatory for all wage earners and self-employed people. There is no religious exemption, no hardship exemption, and no way to opt out. If you are working and earning income, you must pay it.

What if I did not pay Medicare tax for 10 years — can I still get Part A for free?

No. You need 40 quarters (roughly 10 years) of Medicare tax contributions to may have access to for premium-free Part A at 65. If you fall short, you can buy Part A coverage, but the premium is higher than for people who paid in. You can also become may be able to access through your spouse's work history if they paid in for 40 quarters.

Does Medicare payroll tax go into a personal account with my name on it?

No. Your Medicare tax goes into a shared Hospital Insurance Trust Fund that pays benefits for all Medicare beneficiaries right now. It is not saved or invested in an account tied to you. When you turn 65, the payroll taxes of current workers will help pay your benefits.

Why do I owe Additional Medicare Tax if I have two jobs?

Each employer withholds Medicare tax based only on the wages they pay you, not your total income from all jobs. If your combined income crosses the threshold for Additional Medicare Tax, you may owe more than what was withheld. You can claim a refund when you file your tax return if you overpaid.

Is Medicare payroll tax the same as Medicare premiums?

No. Payroll tax is what you pay while working; premiums are what you pay after you turn 65 and enroll in Medicare. Most people do not pay a premium for Part A because they paid payroll tax for 10 years. Part B and Part D have monthly premiums that are separate from the payroll tax you paid.