Additional Medicare Tax on Your Paycheck: The 2026 Thresholds Explained

A worker can see a new 0.9% Medicare deduction late in the year and think payroll has made a mistake. In some cases payroll is doing exactly what federal law requires. An employer must begin withholding Additional Medicare Tax when it pays one employee more than $200,000 in Medicare wages in a calendar year. It uses that $200,000 trigger without asking whether the worker is married, has another job or will ultimately owe the tax on a joint return.

The employee's final liability uses a different test. The IRS Additional Medicare Tax overview lists a $250,000 threshold for married filing jointly, $125,000 for married filing separately, and $200,000 for single, head of household and qualifying surviving spouse. The tax rate is 0.9% on Medicare wages and other covered income above the applicable threshold. Those thresholds are not indexed for inflation according to the Form 8959 instructions.

This split is the central idea. Payroll withholding is a required collection rule. The return determines the final tax. If an employer withheld too much relative to the final calculation, the return can account for the withholding. If employers withheld too little because each saw only part of the income, the return can show an amount due. Do not tell payroll to stop a required withholding merely because your household expects to fall below the joint-return threshold; the IRS says an employer cannot do that.

This article concerns US federal Additional Medicare Tax on ordinary employee Medicare wages. It does not model railroad retirement, self-employment income or special employment arrangements in the worked examples. Those may also matter, and the IRS instructions explain how to combine or separately compare them.

Regular employee Medicare tax is generally 1.45% of Medicare wages. The employer generally pays its own 1.45% share. Unlike Social Security, regular Medicare has no annual wage cap. The Additional Medicare Tax is another 0.9% on wages above the applicable threshold, and there is no matching employer contribution for that additional amount. The IRS rates guide separates the ordinary 1.45% withholding, the 0.9% additional withholding and Social Security's capped 6.2% employee rate.

Suppose an ordinary employee earns $210,000 of Medicare wages from one employer during 2026. Ignoring special adjustments, regular Medicare withholding at 1.45% is $3,045. The employer must also withhold 0.9% on the $10,000 above its $200,000 trigger, or $90. Total employee Medicare withholding in this simple example is $3,135. The extra $90 is not a 0.9% charge on the entire $210,000.

At the same wage level, ordinary Social Security withholding would already have stopped after the 2026 wage base of $184,500, assuming ordinary covered wages at one employer. Seeing Social Security stop and Additional Medicare start around the same part of the year can look contradictory. They are separate taxes with separate rules and thresholds. The SSA wage-base table confirms the 2026 Social Security base; it does not establish a Medicare cap.

For a pay stub review, find the year-to-date Medicare wage line and the year-to-date regular Medicare and Additional Medicare withheld amounts, if payroll displays them separately. Some payroll systems show one Medicare tax line. Ask payroll which line includes the additional 0.9%. Do not assume a line labeled FICA is only Social Security or only Medicare.

Assume Morgan receives $230,000 of Medicare wages from one employer during 2026. The employer's required Additional Medicare Tax withholding is 0.9% of $30,000, or $270. The employer generally starts in the pay period when cumulative Medicare wages first exceed $200,000 and continues on the portion above that level for the rest of the year. A bonus can push the year-to-date wage total across the line in one period.

If Morgan files as single and has no other relevant income or adjustment, the final Additional Medicare Tax on wages in this simplified example is also $270, because the filing threshold is $200,000. If Morgan instead files jointly and the couple's combined relevant income is only $230,000, the joint threshold is $250,000 and the illustrative final Additional Medicare Tax is zero. The $270 withheld is accounted for through the return; payroll was still required to withhold it.

Now suppose Morgan files jointly and a spouse has $90,000 of Medicare wages. Combined Medicare wages are $320,000. Ignoring other relevant income, the amount above the joint $250,000 threshold is $70,000, so the illustrative Additional Medicare Tax is $630. Morgan's employer withheld $270; the spouse's employer, paying only $90,000, may have withheld none. The couple would need to account for the difference when preparing the return, alongside other withholding and payments.

These examples assume no railroad retirement compensation, self-employment income, tips or special wage adjustments. They show why a paycheck deduction alone cannot reveal the final household result. If the facts are more complex, use the IRS questions and answers and the applicable Form 8959 instructions.

Suppose Taylor is single and earns $125,000 from Employer A and $100,000 from Employer B in 2026. Neither employer pays Taylor more than $200,000, so neither is required to withhold Additional Medicare Tax based on its own wage payments. Combined Medicare wages are $225,000. The illustrative amount above the single $200,000 threshold is $25,000, and 0.9% is $225. The return can therefore show $225 of Additional Medicare Tax even though no pay stub had an additional Medicare deduction.

The same issue can arise for spouses filing jointly when both employers individually pay under $200,000 but the couple's combined Medicare wages exceed $250,000. Consider one spouse at $160,000 and another at $140,000. Neither employer crosses the withholding trigger, but combined wages are $300,000. The simplified excess above the joint threshold is $50,000, corresponding to $450 of Additional Medicare Tax. This is not evidence that either employer ignored a required withholding instruction. They were not applying the joint-return calculation to all household income.

A second job started late in the year can make the mismatch less obvious. The new employer's year-to-date payroll record usually tracks wages it pays, not the wages paid by a prior employer. An employee may have a sizeable total across W-2s while each payroll system remains below the $200,000 employer trigger. Use the actual Medicare wage bases, not quoted salaries, in a projection.

The IRS Form 8959 instructions say to add Medicare wages from multiple W-2s when making the return calculation. They also explain how wages and self-employment income interact. An employer's separate $200,000 trigger is not a household exemption and does not mean the combined income escapes the tax.

Form W-2 Box 5 reports Medicare wages and tips. Box 6 reports employee Medicare tax withheld, including any Additional Medicare Tax withheld by the employer. Box 1 reports federal income-tax wages and Box 2 reports federal income tax withheld. Those are different measurements. The IRS instructions for Forms W-2 and W-3 explain the box definitions and specifically say that Box 6 includes Additional Medicare Tax.

To make a first-pass check, compare Box 5 with the ordinary Medicare withholding of 1.45% on the covered wages. If Box 6 is greater than the expected ordinary amount, additional withholding may explain part of the difference. Rounding, tips, corrections and special circumstances can also matter, so do not force a reconciliation from a simplified formula. Ask payroll for the breakdown when the numbers are unclear.

Imagine a W-2 with $230,000 in Box 5. The simple expected ordinary Medicare amount is $3,335: $230,000 times 0.0145. If the employer also withheld $270 of Additional Medicare Tax, the simple expected Box 6 would be $3,605. Keeping a written calculation is useful because a normal form can look wrong when the two components are combined. If your actual Box 6 differs, use year-to-date records and ask payroll.

Do not put the Additional Medicare amount into Box 2 yourself when reviewing the form. Box 2 is federal income-tax withholding. Form 8959 has its own method of reporting Additional Medicare Tax and the employer's additional withholding. The form and year-specific return instructions control the final treatment.

Additional Medicare Tax is a 0.9% employment-related tax on specified wages, self-employment income or railroad compensation above a filing-status threshold. It is not simply the ordinary Medicare rate becoming 2.35% on every dollar earned that year. For ordinary wages paid by one employer, the additional component begins only above the employer's $200,000 withholding trigger. The tax on the return uses the applicable filing-status threshold and other relevant income.

Net Investment Income Tax is a different federal tax with different rules. A person may encounter both terms in tax coverage because both involve higher-income thresholds, but a paycheck line showing Additional Medicare withholding does not tell you whether investment income is subject to another tax. Likewise, a higher federal income-tax bracket does not determine the Medicare rate. Keep separate columns for federal income-tax withholding, regular Medicare, Additional Medicare and Social Security.

The word 'additional' also does not mean the employer matches another 0.9%. The IRS withholding rate guidance states there is no employer match for Additional Medicare Tax. An employer may have its own payroll taxes, but those amounts should not be added to the employee deduction when estimating take-home pay.

This distinction matters when comparing jobs. A $20,000 raise above the employer's trigger can change federal income-tax withholding, regular Medicare withholding and Additional Medicare withholding at the same time, while Social Security may have reached its annual wage base. If you compare only the net increase with the gross increase, you will not know which line changed. Examine the itemized pay stub.

If your expected combined income is near a filing threshold, assemble each job's current Medicare wages, the remaining expected wages, bonuses and relevant self-employment income. For a joint return, include both spouses' covered amounts in the projection. Use the IRS rules to identify the applicable threshold. Then estimate Additional Medicare Tax separately from ordinary federal income tax and compare it with any additional tax already withheld by an employer.

The IRS says you cannot request that an employer withhold Additional Medicare Tax early or increase that particular payroll tax on wages below its mandatory trigger. You may, however, request additional federal income-tax withholding on Form W-4. The extra income-tax withholding is credited against the overall liability on the return, which may include Additional Medicare Tax. Form 8959 instructions also discuss estimated tax payments when withholding will not cover the liability. Do not enter an arbitrary W-4 amount without projecting the full return.

Use a current pay stub rather than just an offer letter. A traditional retirement deferral can lower federal income-tax wages while Medicare wages remain higher; a taxable benefit or other payroll item can also change Box 5. Pay periods and bonuses affect when an employer crosses the $200,000 withholding trigger. Your final paycheck for the year can have a different tax mix from the first.

If you use a paycheck calculator, confirm whether it models Additional Medicare Tax and whether it asks for year-to-date Medicare wages. A calculator that considers only the current period may not know that an employer's year-to-date wages already exceeded the trigger. A result should state its assumptions and be checked against payroll. For the return itself, use the applicable IRS form and instructions or qualified help for complex situations.

First, find Medicare wages on your latest pay stub or W-2 Box 5. Keep federal income-tax wages separate. If one employer's year-to-date Medicare wages are approaching $200,000, expect the employer's 0.9% withholding to begin on the excess paid in the crossing period. Ask payroll how it labels that amount and where it appears on the stub.

Second, add Medicare wages from all jobs. If filing jointly, add the spouse's Medicare wages as well. Compare the combined amount with the relevant return threshold. This is an initial screening step, not a complete Form 8959 calculation when you also have tips, self-employment income or railroad compensation.

Third, compare any amount withheld with your projected final tax. A married worker can have required employer withholding and no final Additional Medicare Tax; two employers can each withhold none while the return shows tax. Either pattern can be normal. Do not describe a difference as a payroll error until you have applied the two different thresholds.

Fourth, inspect the W-2 when it arrives. Box 5 holds Medicare wages, and Box 6 includes regular and additional Medicare withheld. Keep the stubs if you need to ask payroll for a correction. Read the current IRS Form 8959 page and its instructions for the tax year you are filing; do not rely solely on a prior-year screenshot.

Finally, revisit the projection after a raise, a bonus, a spouse's job change or a move into self-employment. The worker's withholding and final return calculation can diverge for good reasons. A clear record of year-to-date wages, each employer's withholding and the filing-status threshold makes the deduction understandable without guessing whether a 0.9% line is 'extra tax on all income.'