Quick Answer
Additional Medicare Tax is an extra 0.9% tax on wages over $200,000 (single) or $250,000 (married filing jointly). On a $300,000 salary, you'd pay an additional $900 in Medicare taxes ($100,000 × 0.9%), bringing your total Medicare tax rate to 2.35% on income above the threshold.
Best Answer
Sarah Chen, Payroll Tax Analyst
Best for anyone earning over $200K who wants to understand their additional tax obligations
What is Additional Medicare Tax?
Additional Medicare Tax is an extra 0.9% tax on employment income above certain thresholds, introduced as part of the Affordable Care Act. This is in addition to the regular 1.45% Medicare tax that everyone pays, bringing your total Medicare tax rate to 2.35% on income above the threshold.
Unlike Social Security tax (which caps at $176,100 in 2026), Medicare taxes apply to ALL of your income with no upper limit.
Income thresholds for 2026
The Additional Medicare Tax kicks in at these income levels:
These thresholds are NOT adjusted for inflation, so more people become subject to this tax each year.
Example: $300,000 salary breakdown
Let's say you're single and earn $300,000 per year:
Your effective Medicare tax rate: 1.75% overall (but 2.35% on income over $200,000)
How withholding works (and why you might owe at tax time)
Here's where it gets tricky: Your employer starts withholding Additional Medicare Tax once your year-to-date wages hit $200,000, regardless of your filing status or spouse's income.
Problem scenarios:
Married couple, both working: If you earn $180,000 and your spouse earns $180,000, your employers won't withhold Additional Medicare Tax (neither of you hits $200,000 individually). But your combined income of $360,000 means you owe Additional Medicare Tax on $110,000 ($360,000 - $250,000 threshold).
Result: You'll owe $990 at tax time ($110,000 × 0.9%).
Self-employment income adds complexity
If you have both W-2 and 1099 income, the calculation becomes more complex:
Example: You have $150,000 W-2 income and $80,000 self-employment income ($230,000 total). As a single filer, you'd owe Additional Medicare Tax on $30,000 ($230,000 - $200,000) = $270.
Planning strategies for high earners
Increase withholding: If you're married with combined income over $250,000, consider having extra tax withheld from paychecks to avoid owing at tax time.
Quarterly estimated payments: Self-employed individuals should include Additional Medicare Tax in their quarterly payments.
Retirement contributions: While 401(k) and IRA contributions reduce federal income tax, they don't reduce Medicare tax liability. HSA contributions, however, do reduce Medicare tax.
What you should do
Use our paycheck calculator to estimate your Additional Medicare Tax liability. If you're married or have multiple income sources, consider working with a tax professional to ensure proper withholding.
Review your year-end paystub to see how much Additional Medicare Tax was withheld, then compare it to your actual liability based on your filing status and total household income.
Key takeaway: Additional Medicare Tax costs high earners an extra 0.9% on income over $200K/$250K thresholds, with no cap — and withholding often doesn't match your actual liability if you're married or have multiple income sources.
*Sources: [IRS Form 8959 Instructions](https://www.irs.gov/pub/irs-pdf/i8959.pdf), [IRS Publication 15](https://www.irs.gov/pub/irs-pdf/p15.pdf)*
Key Takeaway: Additional Medicare Tax adds 0.9% to your Medicare tax rate on high income, but employer withholding often doesn't match your actual liability, especially for married couples with combined high income.
Additional Medicare Tax liability at different income levels for single filers
| Annual Income | Regular Medicare Tax | Additional Medicare Tax | Total Medicare Tax | Effective Rate |
|---|---|---|---|---|
| $150,000 | $2,175 | $0 | $2,175 | 1.45% |
| $200,000 | $2,900 | $0 | $2,900 | 1.45% |
| $250,000 | $3,625 | $450 | $4,075 | 1.63% |
| $300,000 | $4,350 | $900 | $5,250 | 1.75% |
| $400,000 | $5,800 | $1,800 | $7,600 | 1.90% |
More Perspectives
Sarah Chen, Payroll Tax Analyst
For employees who just crossed the income threshold and want to understand the basics
Understanding Additional Medicare Tax as a W-2 employee
If you recently got a promotion or job change that pushed your income over $200,000, you'll start seeing a new deduction on your paystub: Additional Medicare Tax.
How it appears on your paystub
Once your year-to-date wages hit $200,000, you'll see two Medicare-related deductions:
For example, on a $250,000 salary, your annual Medicare taxes would be:
Monthly impact on your paycheck
The Additional Medicare Tax only applies to the portion above $200,000. So if you earn $220,000:
Important if you're married
Your employer withholds based on your individual income hitting $200,000, but the actual tax depends on your filing status:
Key takeaway: Additional Medicare Tax starts once you earn over $200,000, adding about 0.9% to your tax rate on income above that threshold — but the actual amount you owe depends on your filing status and spouse's income.
Key Takeaway: W-2 employees see Additional Medicare Tax withheld once they hit $200,000 in wages, but married couples may need to adjust withholding based on their combined income and filing status.
Sarah Chen, Payroll Tax Analyst
For newer high earners who want to understand what this means for their career trajectory
Additional Medicare Tax for rising high earners
If you're early in your career but already earning six figures, understanding Additional Medicare Tax helps you plan for future salary growth and job changes.
When you'll first encounter this tax
Additional Medicare Tax kicks in at $200,000 for single filers. If you're currently earning $150,000-$180,000, you're likely to hit this threshold within a few years through:
Planning for future tax increases
As your income grows, your effective tax rate increases in steps:
Career planning considerations
Salary negotiations: When evaluating job offers above $200,000, remember that Additional Medicare Tax reduces your take-home by an extra 0.9% on income above the threshold.
Bonus timing: If a bonus would push you over $200,000, consider whether timing it in a different year might be beneficial (though this is rarely practical).
Geographic considerations: Unlike some taxes, Additional Medicare Tax applies regardless of which state you live in — it's a federal tax with no state variations.
Key takeaway: Early high earners should factor Additional Medicare Tax into salary negotiations and long-term financial planning, as it adds nearly 1% to your tax burden on high income.
Key Takeaway: Rising high earners should plan ahead for Additional Medicare Tax, which will reduce take-home pay by an extra 0.9% once they reach $200,000+ income levels.
Sources
- IRS Form 8959 Instructions — Additional Medicare Tax calculation and reporting requirements
- IRS Publication 15 — Employer's Tax Guide - Medicare Tax Information
Related Questions
Reviewed by Sarah Chen, Payroll Tax Analyst on February 28, 2026
This content is for educational purposes only and is not a substitute for professional tax advice. Consult a qualified tax professional for advice specific to your situation.