Learn About Medicare Tax Information

What Is Medicare Tax and Who Pays It

Medicare tax is a federal tax that funds the Medicare program, which provides health insurance coverage to people age 65 and older, some younger people with disabilities, and people with end-stage renal disease. The tax is deducted from paychecks for most workers in the United States and is shared between employers and employees.

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The standard Medicare tax rate is 2.9% of wages. This breaks down as 1.45% withheld from an employee's paycheck and 1.45% paid by the employer. Self-employed individuals pay the full 2.9% themselves, though they can deduct half of this amount on their federal income tax return.

Since 2013, there has been an additional Medicare tax of 0.9% that applies to higher earners. For 2024, this additional tax applies to wages over $200,000 for single filers, $250,000 for married couples filing jointly, and $125,000 for married individuals filing separately. Unlike the standard Medicare tax, employers do not share in paying the additional Medicare tax—it comes entirely from the employee's paycheck.

Certain groups of workers pay Medicare tax, including:

• Employees who work for wages or salaries
• Self-employed individuals with net earnings of $400 or more per year
• Railroad employees (through a similar but separate system)
• Federal employees hired after 1983
• State and local government employees not covered by other retirement systems

There is no upper limit on Medicare tax, meaning all wages are subject to this tax regardless of how much someone earns in a year. This differs from Social Security tax, which has a wage base limit that changes each year.

Practical takeaway: Review your pay stub to confirm Medicare tax is being withheld correctly. The line item typically shows "Medicare Tax" or "Med Tax" alongside the amount. If you are self-employed, track your net earnings to understand your Medicare tax obligation when filing taxes.

Understanding Self-Employment Medicare Tax

Self-employed individuals—including freelancers, small business owners, and independent contractors—have different Medicare tax responsibilities than traditional employees. While employees and employers split the Medicare tax burden, self-employed people pay both portions themselves.

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The self-employment tax calculation uses net earnings from self-employment, not gross income. To find net earnings, subtract business expenses from business income. Only 92.35% of net self-employment income is subject to self-employment tax. This formula helps reduce the overall tax burden slightly.

For someone with $50,000 in net self-employment income, the calculation works like this: $50,000 × 0.9235 = $46,175. Then $46,175 × 2.9% = $1,339.08 in Medicare tax owed. The self-employed person can deduct half of this amount ($669.54) on their federal income tax return, which provides some tax relief.

Self-employed individuals must calculate and pay self-employment tax when they file their annual tax return using Schedule SE (Self-Employment Tax). This form is submitted along with Form 1040. If net self-employment earnings are $400 or more in a year, filing Schedule SE is required.

Additionally, self-employed people may need to pay estimated taxes quarterly if they expect to owe $1,000 or more in taxes for the year. Estimated tax payments for self-employment tax are due on April 15, June 15, September 15, and January 15 of the following year. Making these payments throughout the year helps avoid penalties and interest charges.

The additional 0.9% Medicare tax also applies to self-employed individuals whose net self-employment income exceeds the income thresholds mentioned earlier. This additional tax is calculated differently than the base Medicare tax and requires careful tracking.

Practical takeaway: Keep detailed records of all business income and expenses throughout the year. Use these records to calculate your net self-employment income accurately when tax time arrives. Consider working with a tax professional if your self-employment situation is complex or if you have multiple income sources.

How Medicare Tax Connects to Social Security Tax

Medicare tax and Social Security tax are two separate payroll taxes that are often discussed together because they are both withheld from paychecks. While they fund different programs, they share similarities in how they are calculated and collected.

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Social Security tax currently stands at 12.4% total—6.2% from the employee and 6.2% from the employer. However, Social Security tax only applies to wages up to an annual cap, which changes each year based on inflation. For 2024, the Social Security wage base is $168,600. Once someone earns more than this amount, Social Security tax stops being withheld from additional earnings for the rest of that year.

Medicare tax works differently. There is no wage cap on the 2.9% base Medicare tax rate, meaning all earnings are subject to this tax no matter how high someone's income climbs. The additional 0.9% Medicare tax for high earners also has no cap. This means high-income workers pay Social Security tax only on income up to the annual limit but pay Medicare tax on all their income.

For a worker earning $200,000 in 2024, Social Security tax stops after $168,600 in earnings, but Medicare tax continues on all $200,000. This illustrates why Medicare tax alone generates continuous revenue throughout the year for all workers, while Social Security tax collection has a natural stopping point.

Both taxes are categorized as FICA taxes, which stands for Federal Insurance Contributions Act. When you see "FICA" on your pay stub, this section includes both Medicare and Social Security withholdings. Self-employed individuals pay both self-employment tax (which covers both Medicare and Social Security) and must report both on their tax return.

Understanding the difference between these two taxes helps explain why they appear as separate line items on pay stubs and why they are managed differently when earnings reach high levels.

Practical takeaway: Compare your Medicare and Social Security tax amounts on your pay stub. Early in the year, both may be withheld. Later in the year, once you pass the Social Security wage base limit, only Medicare tax will be withheld. This is normal and expected for higher earners.

Additional Medicare Tax and High-Income Thresholds

In 2013, the Additional Medicare Tax was introduced as part of health care reform legislation. This 0.9% tax applies to wages, compensation, and self-employment income that exceed certain income levels. Understanding these thresholds and how they apply prevents confusion during tax filing.

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The income thresholds for the Additional Medicare Tax are based on filing status and remain the same year to year—they do not adjust for inflation. For 2024, these thresholds are:

• Single filers: $200,000
• Married filing jointly: $250,000
• Married filing separately: $125,000
• Head of household: $200,000
• Qualifying widow(er): $200,000

The Additional Medicare Tax applies only to income that exceeds these thresholds. For example, a single person earning $220,000 would owe the additional tax only on $20,000 of income ($220,000 − $200,000). At 0.9%, this amounts to $180 in additional Medicare tax.

Employers typically begin withholding this additional tax once an employee's wages exceed the threshold for their filing status. However, if someone has multiple jobs, the employer at each job may not know about income from the other positions. This can result in under-withholding of the additional tax. When filing taxes, the total income from all jobs is considered, and any under-withheld additional Medicare tax must be paid with the tax return.

Self-employed individuals calculate the Additional Medicare Tax on their adjusted gross income (after subtracting half of self-employment tax), not just on self-employment income. The calculation is more complex for self-employed people because their income includes various sources that may not be subject to self-employment tax.