Medicare Tax Calculator — 2025 Rate & Additional 0.9%
Estimate 2025 Medicare tax: 1.45% on all wages with no cap, plus the 0.9% Additional Medicare Tax over your filing-status threshold. Free, in-browser.
About Medicare Tax Calculator
A Medicare tax calculator is a tool that estimates the federal Medicare payroll tax you owe on your earnings for the 2025 tax year. Medicare tax has two parts. The regular tax is 1.45% of all your wages or net self-employment income with no upper wage cap, and an employer matches that 1.45%, so an employee pays 1.45% while the self-employed pay both halves at 2.9%. On top of that, an Additional Medicare Tax of 0.9% applies to the individual on earnings above a filing-status threshold. This calculator splits out both parts and shows the totals. It is a 2025 estimate, not tax advice.
Use cases
- See both halves of the self-employed obligation. For self-employed people, Medicare tax is not withheld by an employer, so both the employee and employer halves fall on you as part of self-employment tax. Entering your net self-employment income shows the full 2.9% regular Medicare portion in one place, which helps when setting aside money for quarterly estimated payments rather than being surprised at filing time.
- Check whether the 0.9% surtax applies to you. The Additional Medicare Tax only kicks in once your earnings pass your filing-status threshold — $200,000 single, $250,000 married filing jointly, or $125,000 married filing separately. Entering your wages and filing status shows whether any of your income crosses that line and how much 0.9% tax the excess generates, so a high earner can anticipate it.
- Reconcile employer withholding on your return. Employers must withhold the extra 0.9% once your wages with them exceed $200,000, no matter your filing status. That can mean too much was withheld against a lower joint gap, or too little across two jobs or a joint household. Seeing the calculated surtax next to what was withheld helps you understand the true-up that happens on Form 8959.
- Separate Medicare tax from the rest of your paycheck. Paystubs lump several taxes together, making it hard to see what Medicare alone costs. This tool isolates just the Medicare piece — regular plus any additional — so you can reason about that line without the noise of income tax or Social Security. For the full paycheck picture, pair it with a dedicated paycheck or payroll calculator.
How it works
- Enter your earnings. Type your total Medicare wages or net self-employment income for 2025; this is the base the rates apply to.
- Choose employee or self-employed. Employees pay one 1.45% half; the self-employed pay both halves at 2.9%. This sets how the regular tax is computed.
- Select your filing status. Single, head of household, married filing jointly, or married filing separately sets the threshold for the 0.9% Additional Medicare Tax.
- Add other Medicare wages if any. If you have wages from another job, or a spouse’s income on a joint return, include them so the threshold is applied to your combined earnings.
- Read the breakdown. The tool shows regular Medicare tax, any 0.9% additional tax on income above the threshold, and the combined total.
Examples
Input: Employee, $80,000 wages, single
Output: Regular 1.45% = $1,160; no surtax
Wages are below the $200,000 threshold, so only the regular Medicare tax applies.
Input: Employee, $250,000 wages, single
Output: Regular $3,625 + 0.9% on $50,000 = $450
The 0.9% surtax applies only to the $50,000 above the $200,000 single threshold.
Input: Self-employed, $150,000 net, MFJ
Output: Regular 2.9% = $4,350; no surtax
The self-employed pay both halves; $150,000 is under the $250,000 joint threshold, so no additional tax.
Frequently asked questions
What is the Medicare tax rate for 2025?
Regular Medicare tax is 1.45% of all wages or net self-employment income with no wage cap. Employers match it, so an employee’s earnings are effectively taxed 2.9% between the two sides, and the self-employed pay the full 2.9% themselves.
Is there a wage cap on Medicare tax?
No. Unlike Social Security, Medicare tax has no upper wage limit — the 1.45% applies to every dollar of covered earnings. The only threshold that matters is the one for the extra 0.9% Additional Medicare Tax.
Who pays the 0.9% Additional Medicare Tax?
Only the individual — the employee or self-employed person. It is never matched by an employer. It applies to earnings above $200,000 (single or head of household), $250,000 (married filing jointly), or $125,000 (married filing separately).
Why did my employer withhold the extra 0.9%?
Employers must start withholding the additional 0.9% once your wages with them pass $200,000 in a year, regardless of your filing status. Because your actual threshold may differ, the amount is reconciled on your tax return via Form 8959.
Does this calculate my income tax or Social Security?
No. It estimates Medicare tax only. It does not compute federal or state income tax or Social Security tax. Use a paycheck or payroll calculator for the complete picture of your take-home pay.
Do the self-employed really pay double?
They pay both the employee and employer halves, totalling 2.9% of net self-employment income, as part of self-employment tax. Half of that self-employment tax is deductible against income tax, which this tool does not model.
Is my income data saved anywhere?
No. Everything is calculated in your browser. Nothing you enter is uploaded or stored.
Pro tips
- Use your Medicare wages (often higher than taxable-income wages, because pre-tax 401(k) contributions still count) as the base.
- Include a spouse’s earnings when checking the joint threshold — the 0.9% surtax is based on combined income on a joint return.
- If you have two jobs, remember each employer only withholds the 0.9% after $200,000 with them, so you may owe more at filing.
- Set aside the self-employed 2.9% as you earn if you are self-employed, to avoid a large bill at tax time.
- Treat the result as a 2025 estimate and confirm specifics with a tax professional or the IRS Form 8959 instructions.
Reviewed by Ahsan Mahmood · Last updated 2026-07-08 · Part of ZTools.
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