Medicare is taken out of your paycheck because federal law requires your employer to withhold 1.45% of every dollar you earn to help fund hospital coverage for people 65 and older and certain people with disabilities. Your employer pays a matching 1.45% from its own funds, so 2.9% of your wages go toward Medicare in total. If you earn more than $200,000 at a single job in a year, an extra 0.9% comes out of the wages above that line. The deduction isn’t optional, and it isn’t something your employer decided to do.
The Law That Forces the Withholding
The Federal Insurance Contributions Act, known as FICA, is the statute behind the Medicare and Social Security lines on your pay stub. Section 3101(b) of the Internal Revenue Code imposes a hospital insurance tax equal to 1.45% of wages on “the income of every individual.”1Office of the Law Revision Counsel. 26 USC 3101 – Rate of Tax Employers act as collection agents for the IRS: they withhold your share, add their own matching share, and forward both. That structure is why virtually every legitimate paycheck in the country shows a Medicare deduction.
How the 1.45% Rate Works on Your Wages
The standard Medicare tax is a flat 1.45% on your gross wages each pay period.2Internal Revenue Service. Topic No. 751, Social Security and Medicare Withholding Rates Unlike Social Security tax, which stops once your earnings hit $184,500 in 2026,3Social Security Administration. Contribution and Benefit Base Medicare has no wage cap. Every dollar you earn is subject to the tax.
A quick example. On $2,500 of gross pay for a two-week period, your employer withholds $36.25 for Medicare ($2,500 × 0.0145). At year-end, Box 6 of your W-2 shows the total Medicare tax withheld, and Box 5 shows the wages that tax was calculated on. Box 5 often matches or exceeds Box 1 because fewer deductions shrink Medicare wages than shrink federal taxable income.
Tips Count as Wages
If you work in a tipped job, reported tips are Medicare-taxable. When you report $20 or more in tips in a calendar month, your employer must withhold Medicare tax on that amount from your non-tip wages or other funds you make available.4Internal Revenue Service. Publication 15 – Employers Tax Guide (2026 Draft) Because there’s no wage cap, tips are never exempt regardless of how much you’ve already earned.
Pre-Tax Benefits Can Shrink the Base
Section 125 cafeteria plan contributions are one of the few things that reduce your Medicare-taxable wages. Salary-reduction amounts you contribute pre-tax toward health insurance premiums, a flexible spending account, or a dependent care account are generally excluded from FICA wages entirely.5Internal Revenue Service. FAQs for Government Entities Regarding Cafeteria Plans If you earn $60,000 and put $3,000 pre-tax toward your employer’s health plan, Medicare tax applies to $57,000. Traditional 401(k) contributions work differently: they reduce federal income tax but not Medicare-taxable wages.
The Additional 0.9% on High Wages
The Affordable Care Act added a 0.9% surtax on wages above certain thresholds:1Office of the Law Revision Counsel. 26 USC 3101 – Rate of Tax
- Single or head of household: wages above $200,000
- Married filing jointly: combined wages above $250,000
- Married filing separately: wages above $125,000
Above the threshold for your filing status, the total employee rate becomes 2.35%.6Internal Revenue Service. Questions and Answers for the Additional Medicare Tax Your employer doesn’t know your filing status or your spouse’s income, so it uses one simple rule: start withholding the extra 0.9% once your wages from that job exceed $200,000 in the calendar year.2Internal Revenue Service. Topic No. 751, Social Security and Medicare Withholding Rates
Reconciling on Form 8959
Because the $200,000 withholding trigger doesn’t always match your actual threshold, you may end up owing more or less than what came out of your checks. Form 8959 reconciles the difference at tax time. You have to file it whenever Medicare wages on any single W-2 exceed $200,000, or when your combined wages and self-employment income push past the threshold for your filing status.7Internal Revenue Service. Instructions for Form 8959 (2025) – Additional Medicare Tax
Watch for the underpayment trap in dual-income households. If each spouse earns $190,000 at separate jobs, neither employer withholds the extra 0.9% because neither paycheck crosses $200,000. But the couple’s combined $380,000 exceeds the $250,000 joint threshold by $130,000, so they owe an additional $1,170 in Medicare tax at filing.8eCFR. 26 CFR 31.3102-4 – Special Rules Regarding Additional Medicare Tax Estimated tax payments during the year can prevent the surprise.
Your Employer’s Matching Half
The 1.45% you see is only half of the standard Medicare contribution. Your employer pays a separate 1.45% from its own funds, bringing the total to 2.9% of your wages.2Internal Revenue Service. Topic No. 751, Social Security and Medicare Withholding Rates The employer share never appears on your pay stub because it isn’t your money.
The match has one important limit. Employers do not pay the Additional Medicare Tax; the extra 0.9% falls entirely on the employee.2Internal Revenue Service. Topic No. 751, Social Security and Medicare Withholding Rates A worker earning $300,000 pays 1.45% on the first $200,000 and 2.35% on the next $100,000, while the employer pays a flat 1.45% on the full $300,000.
What Your Medicare Tax Actually Pays For
Your 1.45% and your employer’s matching 1.45% flow into the Hospital Insurance Trust Fund at the U.S. Treasury. That fund is the primary revenue source for Medicare Part A, which covers inpatient hospital stays, skilled nursing facility care, hospice, and some home health services.9Medicare. How Is Medicare Funded? When people talk about the Medicare trust fund running low, they usually mean this specific account.
Your payroll tax does not fund Medicare Part B (doctor visits, outpatient care, lab work) or Part D (prescription drugs). Those pieces of the program are financed through the Supplementary Medical Insurance Trust Fund, which draws mainly from general tax revenue and from monthly premiums paid by enrollees.9Medicare. How Is Medicare Funded? The Medicare line on your pay stub keeps hospital coverage running; the doctor and drug sides of Medicare have separate funding.
Who Doesn’t Pay Medicare Tax
The exemptions are narrow:
- Students enrolled at least half-time whose job is at the same college or university where they study can qualify for a FICA exception, as long as the work is incidental to their studies and doesn’t come with career-style benefits like retirement plan contributions or paid vacation.10Internal Revenue Service. Student FICA Exception
- Members of recognized religious sects that object to insurance benefits can apply for an exemption using Form 4029. Approval means giving up any right to Social Security and Medicare benefits.11Internal Revenue Service. About Form 4029, Application for Exemption From Social Security and Medicare Taxes and Waiver of Benefits
- Employees of foreign governments, their wholly owned instrumentalities, and international organizations generally aren’t subject to FICA on those wages.12Internal Revenue Service. Employees of a Foreign Government or International Organization (FICA) Including Social Security and Medicare Tax
Outside those categories, there’s no way to opt out. Age doesn’t matter either. A 70-year-old already receiving Medicare benefits still pays 1.45% on every paycheck.
Self-Employment Changes the Math
If you work for yourself, there’s no employer to pick up the other half. You pay both sides, for a combined Medicare rate of 2.9% on your net self-employment earnings, and the Additional Medicare Tax still applies once you cross the threshold for your filing status.6Internal Revenue Service. Questions and Answers for the Additional Medicare Tax You can deduct half of the self-employment tax you paid as an above-the-line adjustment on Form 1040, which lowers your adjusted gross income even without itemizing.13Internal Revenue Service. Topic No. 554, Self-Employment Tax
How to Check What Your Employer Withheld
Look for a line labeled “Medicare” or “MedFICA” on each pay stub. On your W-2, Box 5 shows total Medicare-taxable wages and Box 6 shows the tax withheld. Dividing Box 6 by Box 5 should come out to roughly 0.0145, or slightly higher if you crossed $200,000 partway through the year and the extra 0.9% kicked in.
If the numbers don’t line up, flag it with payroll before you file your return. Errors in Box 5 or Box 6 can flow into your Form 8959 calculations and eventually into your Social Security earnings record, which determines whether you qualify for premium-free Medicare Part A when you retire.