Yes, there is a cap on how much you pay in Medicare tax each year

Medicare tax has a wage base limit, which means you stop paying the tax once your earnings reach a certain amount. For 2024, that limit is $168,600. Once you earn that much in a year, your employer stops taking Medicare tax from your paycheck — but only for the standard 1.45% portion that applies to all workers.

The catch is that there is a second Medicare tax of 0.9% that has no cap. This additional tax applies to higher earners and continues no matter how much you make. Understanding which tax applies to you and when you hit the limit matters because it affects your take-home pay and what you owe at tax time.

Key Takeaways

  • The standard Medicare tax of 1.45% stops once you earn $168,600 in a year (2024 limit), but your employer must still withhold it until that point.
  • An additional 0.9% Medicare tax applies to wages over $200,000 for single filers and $250,000 for married couples filing jointly, with no upper limit.
  • Self-employed people pay both the employee and employer portions of Medicare tax, totaling 2.9%, and the cap applies only to the standard portion.
  • The wage base limit changes each year based on inflation, so the amount you stop paying changes annually.
  • If you have multiple jobs or are self-employed and an employee, you may owe additional Medicare tax at tax time if your combined earnings exceed the threshold.

How the standard Medicare tax cap works

The 1.45% Medicare tax that you and your employer each pay has a wage base limit. In 2024, once your wages reach $168,600, your employer stops withholding the 1.45% Medicare tax from your paycheck for the rest of that calendar year. Your employer also stops paying their matching 1.45% share.

This limit is different from Social Security tax, which has a much lower cap ($168,600 in 2024 as well, but that number is set differently). The Medicare wage base limit increases most years to keep pace with inflation. If you earn $170,000 in a year, you pay the full 1.45% on the first $168,600 and nothing on the remaining $1,400.

The limit resets on January 1 each year, so even if you hit the cap in December, you start paying again in January of the next year.

The additional 0.9% Medicare tax with no cap

In 2013, a second Medicare tax took effect as part of the Affordable Care Act. This additional Medicare tax of 0.9% applies to high earners and has no upper limit — it continues no matter how much you make. For 2024, this tax kicks in at $200,000 of wages for single filers, $250,000 for married couples filing jointly, and $125,000 for married couples filing separately.

Your employer is supposed to withhold this 0.9% tax once your wages exceed these thresholds. However, employers sometimes make mistakes, especially if you have multiple jobs. If your employer does not withhold enough, you will owe the difference when you file your tax return.

Self-employed people must calculate and pay this tax themselves when they file their return. Unlike the standard Medicare tax, there is no wage base limit — you pay 0.9% on every dollar you earn above the threshold.

What self-employed people pay

If you are self-employed, you pay both the employee and employer portions of Medicare tax yourself. That means you pay 2.9% total on your net self-employment income (1.45% + 1.45%), not 1.45% like an employee pays. The standard 2.9% rate is subject to the wage base cap of $168,600 in 2024.

On top of that, if your net self-employment income exceeds the thresholds for the additional Medicare tax ($200,000 for single filers), you also owe the 0.9% additional tax with no cap. You calculate and pay both taxes when you file your annual tax return using Schedule SE.

Self-employed people do not have an employer to withhold taxes, so many make quarterly estimated tax payments to avoid owing a large amount at tax time. Your tax professional or the IRS website can help you figure out how much to pay each quarter.

Multiple jobs and the Medicare tax cap

If you work more than one job, each employer withholds Medicare tax separately based only on what they pay you. This can create a problem: if you earn $100,000 at one job and $80,000 at another, each employer withholds the full 1.45% Medicare tax on their portion, even though your combined earnings of $180,000 exceed the $168,600 cap.

You can claim a credit on your tax return for the excess Medicare tax you paid. When you file, the IRS will calculate how much you overpaid and refund it to you or explore it to other taxes you owe. You do not have to do anything special — the IRS handles this automatically when they process your return.

The additional 0.9% Medicare tax is different. If your combined wages from all jobs exceed $200,000 (single) or $250,000 (married filing jointly), you may owe this tax even if each individual employer withheld correctly. Again, you settle this when you file your return.

How the wage base limit changes each year

The Medicare wage base limit is adjusted annually for inflation. The Social Security Administration announces the new limit in October for the following year. In recent years, the limit has increased by roughly $1,000 to $2,000 per year, though the exact amount depends on how much wages have grown in the economy.

You can find the current year's limit on the Social Security Administration website or on your Social Security statement. Your employer should know the current limit and use it to calculate withholding correctly. If you are self-employed, you are responsible for knowing the limit and calculating your taxes accordingly.

What to ask your doctor or tax professional

If you are still working and earning income, ask your tax professional or accountant whether you will owe additional Medicare tax in the current year. They can review your income from all sources and tell you what to expect.

If you have multiple jobs, ask each employer whether they are aware of your other income. Some employers can adjust withholding if you provide them with a W-4 form, though this does not always solve the problem completely.

If you are self-employed, a tax professional can help you set up quarterly estimated payments so you do not face a large bill at tax time. They can also explain how to claim the self-employment tax deduction, which reduces your taxable income.

Frequently Asked Questions

Do I stop paying Medicare tax completely once I hit the wage base limit?

You stop paying the standard 1.45% Medicare tax once you reach $168,600 in wages for the year, but only that portion stops. If you earn over $200,000 (single) or $250,000 (married filing jointly), you still owe the additional 0.9% Medicare tax with no cap. Most people stop paying any Medicare tax once they hit the standard limit, but high earners continue paying the additional tax.

What happens if I work part-time and do not earn $168,600 in a year?

You pay the full 1.45% Medicare tax on all your wages, since you never reach the cap. You do not owe the additional 0.9% tax unless your income exceeds $200,000 (single) or $250,000 (married filing jointly). Most part-time workers pay Medicare tax on their entire earnings for the year.

Can I get a refund if I overpaid Medicare tax because I had multiple jobs?

Yes. When you file your tax return, the IRS calculates whether you overpaid the standard 1.45% Medicare tax and refunds the excess or applies it to other taxes you owe. You do not need to do anything special — the IRS handles this automatically. However, you cannot get a refund for the additional 0.9% Medicare tax; you can only claim it as a credit against other income taxes.

Does the Medicare tax cap explore to my Social Security benefits?

No. Medicare tax and Social Security tax are separate. Social Security tax also has a wage base cap ($168,600 in 2024), but it applies only to Social Security tax, not Medicare tax. Once you start receiving Social Security benefits, you do not pay either tax on those benefits.

What if my employer did not withhold Medicare tax correctly?

Contact your employer's payroll department and ask them to review your withholding. If they made a mistake, they may issue you a corrected W-2 form. If the error is not corrected before you file your return, you can claim the overpayment as a credit. Keep records of what you paid and what your employer withheld so you can provide this information to your tax professional if needed.