Quick Answer
The Additional Medicare Tax of 0.9% kicks in at $200,000 for single filers and $250,000 for married filing jointly. Your employer must withhold this extra tax once your wages exceed these thresholds, regardless of your total household income or filing status.
Best Answer
Sarah Chen, Payroll Tax Analyst
Best for employees earning over $150,000 who need to understand when this tax applies
When does the Additional Medicare Tax start?
The Additional Medicare Tax of 0.9% begins when your wages exceed specific income thresholds that depend on your filing status. Your employer is required to withhold this tax once your wages cross these limits, regardless of your spouse's income or your actual filing status.
Income thresholds for Additional Medicare Tax
Example: Single filer earning $220,000
Let's say you're single and earn $220,000 per year. Here's how the Additional Medicare Tax works:
Your employer will start withholding the extra 0.9% once your year-to-date wages hit $200,000, which typically happens in your November or December paycheck if you're paid bi-weekly.
How employer withholding works
According to IRS Publication 15, your employer must withhold Additional Medicare Tax based solely on your wages with that employer. They cannot consider:
This creates potential over-withholding or under-withholding situations.
Example: Married couple with combined income over $250,000
Suppose you're married filing jointly. You earn $180,000 and your spouse earns $120,000 (total: $300,000).
You'll need to make estimated tax payments or request additional withholding to avoid owing at tax time.
Key factors that affect withholding accuracy
What you should do
Use our paycheck calculator to estimate your Additional Medicare Tax liability and determine if you need to adjust your withholding. If you're close to the thresholds or have complex income situations, consider making quarterly estimated payments or increasing withholding on Form W-4.
Key takeaway: Additional Medicare Tax kicks in at $200,000 for single filers and $250,000 for married couples, but employer withholding is based only on your individual wages, potentially creating tax surprises at filing time.
Key Takeaway: Additional Medicare Tax starts at $200,000 (single) or $250,000 (married), but employer withholding only considers your individual wages, not household income.
Additional Medicare Tax thresholds by filing status
| Filing Status | Income Threshold | Tax Rate on Excess |
|---|---|---|
| Single | $200,000 | 0.9% |
| Married Filing Jointly | $250,000 | 0.9% |
| Married Filing Separately | $125,000 | 0.9% |
| Head of Household | $200,000 | 0.9% |
| Qualifying Widow(er) | $200,000 | 0.9% |
More Perspectives
Sarah Chen, Payroll Tax Analyst
Best for typical employees who want to understand if this tax applies to them
Will this tax affect you?
The Additional Medicare Tax only affects high earners. If you're single and make less than $200,000 per year, or married and your household income is under $250,000, you won't pay this tax.
The basic thresholds
How it appears on your paystub
If you do earn enough to trigger this tax, you'll see it as a separate line item on your paystub, usually labeled "Add'l Medicare" or "Medicare Surtax." It's 0.9% on top of the regular 1.45% Medicare tax everyone pays.
Example for typical earners
If you earn $75,000 per year:
Most W-2 employees will never see this tax on their paystub.
Key takeaway: Unless you earn over $200,000 (single) or $250,000 (married), the Additional Medicare Tax doesn't apply to you.
Key Takeaway: Most W-2 employees earning under $200,000 won't pay Additional Medicare Tax.
Sarah Chen, Payroll Tax Analyst
Best for new workers who want to understand all the taxes on their paystub
Understanding Medicare taxes as a new worker
As someone starting your career, you probably don't need to worry about Additional Medicare Tax. This extra 0.9% tax only kicks in at very high income levels that most entry-level workers won't reach.
What you'll actually pay in Medicare taxes
On every paycheck, you'll see:
Example: $50,000 starting salary
With a $50,000 annual salary:
This is a fixed percentage that applies to all your income, with no maximum limit like Social Security tax has.
When you might see Additional Medicare Tax later
As your career progresses and your salary increases, you'll only encounter Additional Medicare Tax if your individual income exceeds $200,000 (single) or your household income exceeds $250,000 (married). For most people, this is years into their career, if ever.
Key takeaway: Entry-level workers pay only the standard 1.45% Medicare tax; the additional 0.9% tax won't apply until much higher income levels.
Key Takeaway: New workers only pay the standard 1.45% Medicare tax; Additional Medicare Tax applies at much higher income levels.
Sources
- IRS Publication 15 — Employer's Tax Guide for Additional Medicare Tax withholding
- IRC Section 3101(b)(2) — Additional Medicare Tax statute
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.