What Medicare wages are and why they matter

Medicare wages are the earnings your employer uses to calculate how much you owe in Medicare tax. They are not the same as your gross pay, and they are not the same as your taxable income for federal income tax. Medicare tax funds the Medicare program, and the amount you pay depends on what counts as a Medicare wage.

Your employer withholds Medicare tax from your paycheck at a rate of 1.45 percent. If you are self-employed, you pay both the employee and employer portions — 2.9 percent total — on your net earnings. If your income exceeds certain thresholds, you also owe an additional 0.9 percent Medicare tax on the excess. Understanding which parts of your pay count as Medicare wages helps you predict what you will owe and catch errors on your pay stub or tax return.

Key Takeaways

  • Medicare wages include your salary, hourly wages, bonuses, and commissions, but exclude certain fringe benefits like health insurance premiums and dependent care contributions.
  • Your employer withholds 1.45 percent of Medicare wages for Medicare tax, and you are responsible for the same amount — 2.9 percent total if self-employed.
  • An additional 0.9 percent Medicare tax applies to wages over $200,000 (single filers) or $250,000 (married filing jointly), and your employer must withhold it if your wages exceed the threshold.
  • Medicare wages appear on your W-2 form in Box 5, and you can verify the amount by checking your pay stubs and adding them up for the year.
  • Self-employed people calculate Medicare wages from their net business income after deducting half of their self-employment tax.

What counts as Medicare wages

Medicare wages include almost all compensation you receive for work. This covers your base salary or hourly wage, overtime pay, bonuses, commissions, tips, and taxable fringe benefits. If your employer paid you money or something of value for your work, it is almost certainly a Medicare wage.

Some items do not count as Medicare wages. Health insurance premiums your employer deducts from your paycheck are excluded. Contributions to a 401(k), 403(b), or traditional IRA are also excluded. Dependent care benefits, adoption information, and educational information up to $5,250 per year do not count. Certain moving expenses and employer-provided transit benefits are excluded as well. The key rule: if the item is excluded from federal income tax, it is usually excluded from Medicare wages too.

Bonuses and commissions count in full, even if they push your total income above the additional Medicare tax threshold. Severance pay counts as a Medicare wage. Sick pay and vacation pay count. If you received it as compensation for work, include it.

How to calculate Medicare tax on your wages

For employees, the calculation is straightforward. Take your total Medicare wages for the year and multiply by 1.45 percent. That is the amount your employer withholds from your paychecks. You do not calculate this yourself — your employer does it automatically.

However, you may owe additional Medicare tax if your wages exceed the threshold. For 2024, the threshold is $200,000 for single filers and $250,000 for married couples filing jointly. If your wages exceed your threshold, multiply the excess by 0.9 percent. Your employer must withhold this additional tax if your wages cross the threshold during the year.

Example: You are single and earn $220,000 in wages during 2024. Your employer withholds 1.45 percent on all $220,000, which equals $3,190. Your employer also withholds 0.9 percent on the $20,000 over the $200,000 threshold, which equals $180. Your total Medicare tax withheld is $3,370.

How self-employed people calculate Medicare wages

If you are self-employed, you calculate Medicare wages from your net business income. Start with your total business income and subtract your business expenses. This gives you your net profit. You then subtract half of your self-employment tax from this net profit to arrive at your Medicare wage base.

Self-employment tax is 15.3 percent of your net earnings — 12.4 percent for Social Security and 2.9 percent for Medicare. You calculate it on Schedule SE (Form 1040). Once you know your self-employment tax, you subtract half of it from your net profit. The result is your net earnings from self-employment, which is your Medicare wage base.

You then owe Medicare tax on this amount. If your net earnings exceed $200,000 (single) or $250,000 (married filing jointly), you also owe the additional 0.9 percent Medicare tax on the excess. You pay all of this when you file your tax return, usually through quarterly estimated tax payments.

Finding your Medicare wages on your W-2

Your employer reports your Medicare wages in Box 5 of your W-2 form, which you receive by January 31 each year. This box shows the total Medicare wages your employer withheld tax on during the year. You can use this number to verify that your employer calculated correctly.

To check the accuracy, gather all your pay stubs from the year and add up the Medicare wages shown on each one. This total should match Box 5 on your W-2. If it does not, contact your employer's payroll department and ask them to explain the difference. Common reasons include a late bonus that was not yet processed, a correction from a previous pay period, or an error.

Box 6 on your W-2 shows the Medicare tax your employer withheld. Multiply your Box 5 amount by 1.45 percent — this should roughly match Box 6, unless you also owed additional Medicare tax. If you earned over the threshold, Box 6 will be higher because it includes the additional 0.9 percent tax on the excess.

Correcting Medicare wage errors

If your W-2 shows incorrect Medicare wages, ask your employer to issue a corrected W-2 (Form W-2c). This must happen before you file your tax return. If you already filed and then discovered an error, you can file an amended return using Form 1040-X and recalculate your Medicare tax based on the correct wages.

If your employer withheld too much Medicare tax, you will receive a refund when you file your return. If your employer withheld too little, you will owe the difference. This sometimes happens when you change jobs mid-year and your new employer does not know about your wages at your previous job — you may not hit the additional Medicare tax threshold until you file.

Keep your pay stubs for at least three years. They are your proof of what you earned and what was withheld. If the IRS ever questions your Medicare tax, you can show them the stubs to support your W-2.

Medicare wages and Social Security tax

Medicare wages are different from Social Security wages. Social Security tax applies only to the first $168,600 of your wages in 2024 (this amount changes each year). Once you earn more than that, your employer stops withholding Social Security tax, but continues withholding Medicare tax on all your remaining wages.

This is why high earners often see their paycheck increase noticeably in the fall — Social Security tax stops, but Medicare tax continues. Your W-2 will show both amounts separately: Box 3 for Social Security wages and Box 5 for Medicare wages. In most years, Box 5 will be equal to or slightly higher than Box 3, because Medicare wages include some items Social Security wages do not.

Frequently Asked Questions

Do I owe Medicare tax on income from investments or rental property?

No. Medicare tax applies only to wages from work and net earnings from self-employment. Investment income, rental income, and capital gains do not count as Medicare wages. However, if you are self-employed and have rental income from a business you actively manage, that may count as self-employment income subject to Medicare tax.

What if I worked for two employers in the same year?

Each employer withholds 1.45 percent Medicare tax on the wages they paid you. When you file your return, you add up all your wages from all employers. If the combined total exceeds the additional Medicare tax threshold, you may owe the extra 0.9 percent. You claim a credit for any additional Medicare tax your employers already withheld, and pay any remaining balance with your return.

Are tips included in Medicare wages?

Yes. Reported tips count as Medicare wages. You must report all tips to your employer, and your employer includes them in your Medicare wages. If you did not report tips to your employer, you still owe Medicare tax on them when you file your return.

Does Medicare tax explore to my 401(k) contributions?

No. Contributions to a traditional 401(k) are deducted before Medicare tax is calculated, so they reduce your Medicare wages. Roth 401(k) contributions are made after tax, so they do count as Medicare wages.

Can I deduct Medicare tax on my tax return?

If you are self-employed, you can deduct half of your self-employment tax (which includes Medicare tax) as an adjustment to income on your Form 1040. If you are an employee, you cannot deduct the Medicare tax your employer withholds — it is a payroll tax, not an income tax.