Additional Medicare Tax

Additional Medicare Tax

On Nov. 26, 2013, the IRS issued final regulations (TD 9645) implementing the Additional Medicare Tax as added by the Affordable Care Act (ACA). The Additional Medicare Tax applies to wages, railroad retirement (RRTA) compensation, and self-employment income over certain thresholds. Employers are responsible for withholding the tax on wages and RRTA compensation in certain circumstances.

BASIC FAQs

1. When did Additional Medicare Tax start?

Additional Medicare Tax went into effect in 2013 and applies to wages, compensation, and self-employment income above a threshold amount received in taxable years beginning after Dec. 31, 2012.

2. What is the rate of Additional Medicare Tax?

The rate is 0.9 percent.

3. When are individuals liable for Additional Medicare Tax?

An individual is liable for Additional Medicare Tax if the individual’s wages, compensation, or self-employment income (together with that of his or her spouse if filing a joint return) exceed the threshold amount for the individual’s filing status:

Filing Status

Threshold Amount

Married filing jointly $250,000
Married filing separate $125,000
Single $200,000
Head of household (with qualifying person) $200,000
Qualifying widow(er) with dependent child $200,000

4. What wages are subject to Additional Medicare Tax?

All wages that are currently subject to Medicare Tax are subject to Additional Medicare Tax if they are paid in excess of the applicable threshold for an individual’s filing status. For more information on what wages are subject to Medicare Tax, see the chart, Special Rules for Various Types of Services and Payments, in section 15 of Publication 15, (Circular E), Employer’s Tax Guide.

5. What Railroad Retirement Tax Act (RRTA) compensation is subject to Additional Medicare Tax?

All RRTA compensation that is currently subject to Medicare Tax is subject to Additional Medicare Tax if it is paid in excess of the applicable threshold for an individual’s filing status. All FAQs that discuss the application of the Additional Medicare Tax to wages also apply to RRTA compensation, unless otherwise indicated.

6. Are nonresident aliens and U.S. citizens living abroad subject to Additional Medicare Tax?

There are no special rules for nonresident aliens and U.S. citizens living abroad for purposes of this provision. Wages, other compensation, and self-employment income that are subject to Medicare tax will also be subject to Additional Medicare Tax if in excess of the applicable threshold.

7. Will I also owe net investment income tax on my income that is subject to Additional Medicare Tax?

No. The tax imposed by section 1411 on an individual’s net investment income is not applicable to wages, RRTA compensation, or self-employment income. Thus, an individual will not owe net investment income tax on these categories of income, regardless of the taxpayer’s filing status. See more information on the Net Investment Income Tax.

INDIVIDUAL FAQs

Wages, RRTA Compensation, and Self-Employment Income

8. Will an individual owe Additional Medicare Tax on all wages, RRTA compensation and self-employment income or just the wages, RRTA compensation and self-employment income in excess of the threshold for the individual’s filing status?

An individual will owe Additional Medicare Tax on wages, compensation and self-employment income (and that of the individual’s spouse if married filing jointly) that exceed the applicable threshold for the individual’s filing status. Medicare wages and self-employment income are combined to determine if income exceeds the threshold. A self-employment loss is not considered for purposes of this tax. RRTA compensation is separately compared to the threshold.

9. Are wages that are not paid in cash, such as fringe benefits, subject to Additional Medicare Tax?

Yes. The value of taxable wages not paid in cash, such as noncash fringe benefits, are subject to Additional Medicare Tax, if, in combination with other wages, they exceed the individual’s applicable threshold. Noncash wages are subject to Additional Medicare Tax withholding, if, in combination with other wages paid by the employer, they exceed the $200,000 withholding threshold.

10. Are tips subject to Additional Medicare Tax?

Yes. Tips are subject to Additional Medicare Tax, if, in combination with other wages, they exceed the    individual’s applicable threshold. Tips are subject to Additional Medicare Tax withholding, if, in combination with other wages paid by the employer, they exceed the $200,000 withholding threshold.

Withholding and Estimated Tax Payments

(See Publication 505, Tax Withholding and Estimated Tax, for more information)

11. Will Additional Medicare Tax be withheld from an individual’s wages?

An employer must withhold Additional Medicare Tax from wages it pays to an individual in excess of $200,000 in a calendar year, without regard to the individual’s filing status or wages paid by another employer. An individual may owe more than the amount withheld by the employer, depending on the individual’s filing status, wages, compensation, and self-employment income. In that case, the individual should make estimated tax payments and/or request additional income tax withholding using Form W-4, Employee’s Withholding Allowance Certificate.

12. Will Additional Medicare Tax be withheld from an individual’s compensation subject to Railroad Retirement Tax Act (RRTA) taxes?

An employer must withhold Additional Medicare Tax from RRTA compensation it pays to an individual in excess of $200,000 in a calendar year without regard to the individual’s filing status or compensation paid by another employer. An individual may owe more than the amount withheld by the employer, depending on the individual’s filing status, wages, compensation, and self-employment income. In that case, the individual should make estimated tax payments and/or request additional income tax withholding using Form W-4, Employee’s Withholding Allowance Certificate.