What it means
Employers withhold Medicare tax from employees' pay and pay a matching amount themselves. The tax applies to Medicare wages, which broadly include salary, bonuses, commissions and many taxable benefits.
There is no ceiling, so the tax applies to every dollar of covered pay. The reason Medicare wages can differ from ordinary taxable wages is that some deductions reduce income tax but not Medicare tax.
For example, contributions to a workplace retirement plan generally reduce taxable income but still count as Medicare wages. In contrast, certain benefit plans such as health premiums paid under a cafeteria plan are usually excluded from both.
Higher earners face an additional Medicare tax on wages above a threshold set by law. The extra tax is paid by the employee only, and employers must begin withholding it once pay passes the threshold.
Payroll teams need to monitor this carefully, because the threshold applies to the employee's total wages from a single employer. On the wage statement, Medicare wages appear in their own box, next to the box for Medicare tax withheld.
Comparing these two numbers is a quick check for payroll errors. The tax withheld should equal the wages multiplied by the rate, except where the additional tax applies.
For finance and HR professionals, getting this figure right matters for compliance. Errors can lead to under- or over-withholding, penalties and corrected filings.
Accurate treatment of fringe benefits, such as company cars or taxable gifts, is a frequent source of mistakes. Rates and thresholds are set by the tax authority and can change, so payroll systems should be kept up to date.
The figures in the example below are assumptions to show the method, not statements of current law.
In practice
Real-world examples.
Example
A payroll clerk notices that an employee's Medicare wages are higher than his taxable income on the wage statement. The difference is explained by his contributions to a workplace retirement plan. She documents the reconciliation for the auditors.
Example
An executive receives a $250,000 bonus in addition to her salary. Her Medicare wages include the bonus, and the employer begins withholding additional tax once her pay crosses the statutory threshold. She plans her cash flow around the extra withholding.
Example
A small business gives staff a taxable gift card worth $200 at year end. The finance manager includes it in Medicare wages and withholds tax accordingly. This avoids a penalty when the payroll authority reviews the books.
Formula
Calculation
Medicare wages = Gross pay - Pre-tax benefits that are exempt from Medicare tax
Medicare tax = Medicare wages x Medicare tax rate
Suppose an employee earns $100,000 in gross pay. She defers $10,000 into a retirement plan, which does not reduce Medicare wages, and pays $4,000 of health premiums through a cafeteria plan, which is exempt. Medicare wages are 100,000 - 4,000 = $96,000. Assuming an employee rate of 1.45% for illustration, the tax is 96,000 x 0.0145 = $1,392.Case study
Seen in the real world.
Elmwood Staffing is an illustrative, fictional agency with 120 employees. An internal review found that Medicare tax withheld did not match Medicare wages multiplied by the rate for eight employees.
The cause was a payroll setting that treated a company car allowance as non-taxable. The allowance was $6,000 per employee per year, so each employee's Medicare wages were understated by $6,000.
At an assumed rate of 1.45% the tax was understated by 6,000 x 0.0145 = $87 per employee, or 8 x 87 = $696 in total, before the employer share. Elmwood corrected the setting and filed amended returns. The illustrative lesson is that a simple reconciliation of wages to tax withheld catches errors early. The payroll manager now runs the reconciliation every quarter, and she sends the result to the finance director for sign-off.
Watch out
Common mistakes.
- Assuming Medicare wages equal taxable income, when pre-tax retirement contributions reduce one but not the other.
- Applying a wage ceiling to Medicare tax, when there is no cap on covered earnings.
- Forgetting the additional tax for high earners, which is withheld from the employee only once pay passes a set threshold.
Questions
People also ask.
Where can I find Medicare wages?
They appear in their own box on the annual wage statement, next to the Medicare tax withheld. Look at the boxes labelled for wages and tax withheld, which sit next to each other so the two can be compared at a glance.
Do employers pay Medicare tax too?
Yes, the employer pays a matching amount on the same wages, apart from the additional tax, which falls only on the employee. The employer and employee shares are normally equal, so a quick doubling of the employee figure gives the combined cost for ordinary wages.
Are all benefits included?
No, some benefits are exempt, such as certain health premiums paid through a cafeteria plan, while taxable fringe benefits are included. If an item is taxable income but not obviously wages, such as a taxable gift, ask a payroll specialist before leaving it out.
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