Medicare is funded by a payroll tax that you and your employer both pay

Medicare comes out of your paycheck because it is funded through a payroll tax, not from general tax dollars. The federal government requires employers to withhold a portion of your wages for Medicare, and your employer contributes an equal amount on your behalf. This happens automatically — you do not choose whether to participate.

The Medicare tax rate is 1.45% of your gross wages, taken from your paycheck. Your employer pays another 1.45%, for a total of 2.9% of your wages going to Medicare. If you are self-employed, you pay both portions yourself, which comes to 2.9% of your net business income.

This tax started in 1965 when Medicare was created. Congress designed it as a dedicated funding source so that Medicare would have money set aside specifically for hospital insurance, doctor visits, and other covered services. The money you pay in now helps fund benefits for people currently on Medicare, and your future Medicare benefits will be funded by people working and paying the tax then.

Key Takeaways

  • Medicare tax is 1.45% of your wages, withheld automatically from your paycheck, with your employer paying an equal 1.45%.
  • Self-employed people pay the full 2.9% themselves because they are both employee and employer.
  • Additional Medicare tax of 0.9% applies to wages above a certain threshold, and higher earners may owe an extra 3.8% tax on investment income.
  • The money withheld from your paycheck goes into a trust fund that pays current Medicare benefits, not into a personal account with your name on it.
  • You cannot opt out of Medicare tax while you are working, even if you do not plan to use Medicare later.

How much Medicare tax comes out depends on your income level

Most workers pay 1.45% on all their wages. However, if your income exceeds a certain threshold, you pay an Additional Medicare Tax of 0.9% on the amount above that threshold. The threshold depends on your filing status: $200,000 for single filers, $250,000 for married couples filing jointly, and $125,000 for married people filing separately.

This additional tax was added in 2013 as part of the Affordable Care Act. It applies to wages, salaries, and tips — not to Social Security benefits or other income sources. Your employer is responsible for withholding it once your wages cross the threshold in a given year.

If you have investment income — such as capital gains, dividends, or rental income — you may also owe a separate 3.8% tax on that income if your modified adjusted gross income exceeds the same thresholds. This is different from the payroll tax and is handled through your annual tax return, not through paycheck withholding.

The money withheld does not go into a personal account with your name

Many people assume their Medicare tax goes into an account earmarked for them personally, similar to a savings account. That is not how it works. The money you pay in goes into the Medicare Trust Fund, which is a shared pool used to pay benefits for all Medicare beneficiaries right now.

When you turn 65 and become may be able to access for Medicare, your benefits come from the trust fund at that time, paid for by people currently working and paying the tax. This is called a "pay-as-you-go" system. Your individual contributions do not determine how much you receive in benefits — your benefits are based on your age, the type of coverage you choose, and your income level.

The trust fund has separate accounts for different parts of Medicare: Part A (hospital insurance) and Part B (medical insurance) each have their own trust funds. The government tracks how much money is coming in from payroll taxes and how much is going out in benefits, and adjusts tax rates or benefits if the fund is projected to run short.

You cannot opt out of Medicare tax while you are working

Even if you do not plan to use Medicare, do not want Medicare, or have private health insurance through your employer, you still must pay Medicare tax on your wages. There is no exemption based on age, health status, or having other coverage.

The only exception is for certain religious groups — members of the Amish, Mennonite, and a few other faiths may request an exemption if they have never received Social Security benefits and do not intend to. This is rare and requires filing Form 4029 with the IRS before you turn 18.

Once you stop working and reach age 65, you become may be able to access for Medicare automatically. You can choose to delay enrollment in Part B (doctor and outpatient services) if you have employer coverage, but Part A (hospital insurance) is automatic. The payroll tax you paid while working is considered your contribution toward that coverage.

What happens to Medicare tax if you change jobs or work multiple jobs

If you change jobs during the year, each employer withholds Medicare tax from your paycheck based on what you earn at that job. If your total wages across all jobs exceed the Additional Medicare Tax threshold, you may have too little withheld during the year and owe more when you file your tax return.

For example, if you earn $150,000 at one job and then take a second job earning $100,000, your first employer withholds the additional 0.9% tax only on wages above $200,000 — which is zero, since you have not hit that threshold yet at that job. Your second employer does the same. But your total income is $250,000, so you owe the additional tax on $50,000 of it. You will reconcile this when you file your tax return and may owe additional tax or receive a refund.

The regular 1.45% Medicare tax has no wage cap, so you pay it on all your earnings no matter how much you make. Only the additional 0.9% tax is limited to income above the threshold.

Self-employed people pay both the employee and employer share

If you are self-employed, you pay the full Medicare tax yourself: 1.45% on your net self-employment income, plus the additional 0.9% if your income exceeds the threshold. This totals 2.35% or more, compared to the 2.9% or more that a regular employee and employer pay combined.

You calculate self-employment tax on Schedule SE (Form 1040) when you file your annual tax return. You can deduct half of your self-employment tax as a business expense on your tax return, which reduces your taxable income slightly. You pay self-employment tax quarterly through estimated tax payments if you expect to owe $1,000 or more for the year.

Self-employed people also have the option to set up a Solo 401(k) or SEP-IRA to reduce their taxable income, which indirectly reduces the amount of self-employment tax owed. A tax professional can help you understand whether these options make sense for your situation.

Medicare tax rates and rules can change

Congress sets Medicare tax rates and can change them, though this happens rarely. The current rates have been in place since 2013. If Congress decides the Medicare Trust Fund needs more money to pay benefits, it could raise the tax rate, lower the wage cap (if one is added), or change the income thresholds for the additional tax.

You can find your Medicare tax withholding on your pay stub under "Medicare" or "Med Tax." Your annual W-2 form shows the total Medicare tax withheld for the year in Box 6. If you believe the amount withheld is incorrect, contact your employer's payroll department or speak with a tax professional.

Frequently Asked Questions

Can I get my Medicare tax back if I do not use Medicare?

No. Medicare tax is not refundable, and you cannot reclaim it even if you never use Medicare benefits. Once you reach 65, you are may be able to access for Medicare, and the tax you paid is considered your contribution toward that coverage. If you choose not to enroll in Medicare, the tax you paid is not returned to you.

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

It depends on the country and the agreement in place. The United States has totalization agreements with some countries that allow work credits earned abroad to count toward Social Security and Medicare. If you worked in a country with such an agreement, those credits may count. Contact the Social Security Administration to learn whether your work history qualifies.

Does Medicare tax come out of my Social Security benefits?

No. Once you stop working and start receiving Social Security, Medicare tax is no longer withheld from your benefits. Instead, you pay for Medicare Part B and Part D premiums, which are deducted from your Social Security check. Part A (hospital insurance) is free for most people who paid Medicare tax while working.

Why do I pay Medicare tax if I already have health insurance through my employer?

Medicare tax funds a separate program designed for people 65 and older. Your employer health insurance covers you now, but Medicare tax is a mandatory contribution toward the program you will become may be able to access for at 65. You cannot opt out based on having other coverage.

What if my employer did not withhold Medicare tax from my paycheck?

Contact your employer's payroll department when ready. Your employer is required by law to withhold Medicare tax. If it was not withheld, you may owe it when you file your tax return, or your employer may owe back taxes and penalties. A tax professional can help you determine what happened and what steps to take.