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Home / Articles / IRS provides guidance on additional 0.9% Medicare tax

IRS provides guidance on additional 0.9% Medicare tax

December 11, 2012


Recently the IRS issued proposed regulations regarding the 0.9% Additional Hospital Insurance Tax on High-Income Taxpayers (commonly referred to as the additional Medicare tax), which takes effect Jan. 1, 2013. The IRS also released answers to frequently asked questions (FAQs) concerning the new tax.

Individuals, employers and payroll service providers may rely on the proposed regulations until final regulations are published.


High-income taxpayers should evaluate their liability for the tax and adjust their withholdings or estimated tax payments accordingly.

Currently, under the Federal Insurance Contributions Act (FICA), wages are subject to a 2.9% Medicare tax — 1.45% paid by employers and 1.45% withheld from employees’ wages. (A similar tax is imposed on railroad employers and employees under the Railroad Retirement Tax Act — please contact us for more information if relevant to your situation.)

Beginning in 2013, under the Patient Protection and Affordable Care Act of 2010, employees will be subject to the 0.9% additional Medicare tax on FICA wages and self-employment income to the extent that they exceed the following threshold amounts: $250,000 for joint filers; $125,000 for married taxpayers filing separately; and $200,000 for individuals, heads of household and other filers.

Unlike regular Medicare taxes, the additional Medicare tax doesn’t include a corresponding employer portion. But employers are obligated to withhold the additional tax to the extent that an employee’s wages exceed $200,000 in a calendar year.

The proposed regulations and FAQs don’t address the new 3.8% Medicare tax on net investment income of high-income taxpayers, which also takes effect next year. The FAQs clarify, however, that the net investment income tax doesn’t apply to FICA wages or self-employment income.

Calculating the tax

Individuals are required to report and pay additional Medicare taxes on their income tax returns. Calculating the tax is straightforward: Take the excess of the wages (or self-employment income) over the applicable threshold and then multiply that amount by 0.9%. For example, a husband and wife who each earn $150,000 in FICA wages would be liable for additional Medicare taxes on $50,000 (the excess of their combined $300,000 in wages over the $250,000 threshold for joint filers).

The proposed regulations provide guidance on calculating the tax when an individual or married couple has both FICA wages and self-employment income.

The calculation of the tax is a three-step process:

1.      Calculate additional Medicare tax on wages to the extent that they exceed the applicable threshold (without regard to withholding),
2.      Reduce the applicable threshold by the total amount of Medicare wages received (but not below zero), and
3.      Calculate additional Medicare tax on self-employment income to the extent it exceeds the reduced threshold.

Here’s an example:

John and Heather are married and file jointly. John earns $150,000 in FICA wages and Heather earns $175,000 in self-employment income. John’s wages don’t exceed the $250,000 threshold for joint filers, so the couple isn’t liable for additional Medicare tax on his wages. To calculate the tax on Heather’s self-employment income, subtract John’s $150,000 from the $250,000 threshold, for a reduced threshold of $100,000. The couple is liable for additional Medicare tax on $75,000 (Heather’s $175,000 in self-employment income minus the $100,000 reduced threshold).

Withholding issues

The proposed regulations make it clear that an employer is required to withhold additional Medicare tax on wages in excess of $200,000 in a calendar year, without regard to the employee’s filing status or his or her income from other sources. This means that in some cases employers will be required to withhold the tax from wages paid to employees who aren’t liable for the tax — because, for example, their wages, together with those of their spouses, don’t exceed the $250,000 threshold for joint filers.

According to the FAQs, in this situation an employee can’t ask the employer to stop withholding the tax. Rather, the employee should claim a credit for the withheld taxes on his or her income tax return for the year.

It’s also possible that no taxes will be withheld from employees who are liable for the tax. Suppose, for example, that a husband and wife file jointly and each has $175,000 in FICA wages. Neither of their employers would be required to withhold additional Medicare taxes, yet they’d be liable for the tax to the extent their wages exceed the $250,000 threshold. In this case, the tax would be $900: 0.9% × ($350,000 − $250,000). Similarly, no tax would be withheld if an individual has two jobs and neither job pays wages in excess of the threshold.

Under the proposed regulations, employees who anticipate additional Medicare tax liability may not request that their employers withhold additional amounts specifically for the tax. They may, however, use Form W-4 to request additional income tax withholding sufficient to cover their liability for the additional Medicare tax. To the extent this additional liability isn’t covered by employer withholding, employees should use estimated tax payments to make up the shortfall and avoid interest and penalties.

If an employee’s annual wages are expected to top $200,000, the employer isn’t required to withhold additional Medicare tax from the beginning of the year. According to the FAQs, “An employer is required to begin withholding additional Medicare tax in the pay period in which it pays wages in excess of $200,000 to an employee.”

An employer that fails to meet its withholding, deposit, reporting and payment responsibilities is liable for additional Medicare tax, plus all applicable penalties. If the employee pays the tax, the employer is relieved of liability for the tax, but may still be subject to penalties.

Adjustments and refund claims

The proposed regulations allow employers to make interest-free adjustments in the event of underpayments or overpayments of additional Medicare tax. Generally, this is done by filing the appropriate corrected return (for example, Form 941-X) and then either reimbursing overpaid amounts to the employee or collecting underpaid amounts from the employee’s wages before the end of the year.

Underpayments may be adjusted only if the error occurs during the same year the underlying wages were paid (with certain exceptions, including underpayments attributable to administrative errors or IRS examinations). The employer is liable for the correct amount of tax, even if it’s unable to deduct underpaid taxes from the employee’s wages.

Overpayments may be adjusted if the employer ascertains the error in the year the wages were paid and reimburses the employee for overcollected amounts by the end of the year. If the employer is unable to reimburse the employee by year end, it shouldn’t make an adjustment. Instead, it should report the amount withheld on the employee’s W-2 so the employee can obtain credit for the tax (and, if appropriate, a refund) on his or her individual income tax return.

The proposed regulations allow an employer to claim a refund of overpaid additional Medicare tax, provided it didn’t deduct or withhold the overpaid amounts from the employee’s wages.

Get ready

The additional Medicare tax will take effect soon. To be ready, employers should be sure that their payroll procedures and systems are equipped to handle the new withholding requirements. High-income taxpayers should evaluate their liability for the tax and adjust their withholdings or estimated tax payments accordingly.

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All content provided in this article is for informational purposes only. Matters discussed in this article are subject to change. For up-to-date information on this subject please contact a Clark Schaefer Hackett professional. Clark Schaefer Hackett will not be held responsible for any claim, loss, damage or inconvenience caused as a result of any information within these pages or any information accessed through this site.


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