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IRS.gov Website
Rev. date: 11/20/2015


Additional Medicare Tax

Tax Topic 560
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A 0.9% Additional Medicare Tax applies to Medicare wages, self-employment income, and railroad retirement (RRTA) compensation that exceed the following threshold amounts based on filing status:
This additional tax is used to help fund the Affordable Care Act tax provisions, including the Premium Tax Credit.
Combine Medicare wages and self-employment income to determine if income exceeds the threshold. Do not consider a self-employment loss for purposes of this tax. Compare Railroad retirement (RRTA) compensation separately to the threshold.
All Medicare wages, railroad retirement (RRTA) compensation, and self-employment income subject to Medicare Tax are subject to Additional Medicare Tax, if paid in excess of the applicable threshold for the taxpayer’s filing status. For more information on what wages are subject to Medicare Tax, see the chart on Special Rules for Various Types of Services and Payments in Section 15 of Publication 15, (Circular E), Employer’s Tax Guide.


No Special Rules if Living Abroad

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There are no special rules for nonresident aliens or U.S. citizens and resident aliens living abroad for purposes of this provision. Medicare wages, railroad retirement (RRTA) compensation, and self-employment income earned by such individuals will also be subject to Additional Medicare Tax, if in excess of the applicable threshold for their filing status.


Employer Responsibilities

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An employer is responsible for withholding the Additional Medicare Tax from wages or railroad retirement (RRTA) compensation it pays to an employee in excess of $200,000 in a calendar year, without regard to filing status. An employer must begin withholding Additional Medicare Tax in the pay period in which the wages or railroad retirement (RRTA) compensation paid to an employee for the year exceeds $200,000. The employer then continues to withhold it each pay period until the end of the calendar year. There is no employer match for Additional Medicare Tax.


Tax Withholding and Estimated Tax

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Some taxpayers may need to request that their employer withhold an additional amount of income tax withholding on Form W-4, Employee’s Withholding Allowance Certificate, or make estimated tax payments to account for their Additional Medicare Tax liability.


Computing the Tax

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Use Form 8959, Additional Medicare Tax, to compute this tax, and report this tax and any Additional Medicare Tax withheld on Form 1040, U.S. Individual Income Tax Return, Form 1040-NR, U.S. Nonresident Alien Income Tax Return, or Form 1040-SS, U.S. Self-Employment Tax Return (Including the Additional Child Tax Credit for Bona Fide Residents of Puerto Rico).


Additional Information

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For additional information, refer to the Instructions 8959 (PDF) and to Questions and Answers for the Additional Medicare Tax.