Individuals must pay an additional 0.9% Medicare tax on earned income above certain thresholds. The employee portion of the Medicare tax is increased from 1.45% to 2.35% on wages received in a calendar year in excess of $200,000 ($250,000 for married couples filing jointly; $125,000 for married filing separately). Employers must withhold and remit the increased employee portion of the Medicare tax for each employee whose wages for Medicare tax purposes from the employer are greater than $200,000. There is no employer match for this additional Medicare tax. Therefore, the employer’s Medicare tax rate continues to be 1.45% on all Medicare wages. An employee is responsible for paying any of the additional 0.9% Medicare tax that is not withheld by an employer. The additional tax will be reported on the individual’s federal income tax return. Because the additional 0.9% Medicare tax applies at different income levels depending on the employee’s marital and filing status, some employees may have the additional Medicare tax withheld when it will not apply to them (e.g., the employee earns more than $200,000, is married, filing jointly, and total annual compensation for both spouses is $250,000 or less). In such a situation, the additional tax will be treated as additional income tax withholding that is credited against the total tax liability shown on the individual’s income tax return. Alternatively, an individual’s wages may not be greater than $200,000, but when combined with a spouse’s wages, total annual wages exceed the $250,000 threshold. When a portion of an individual’s wages will be subject to the additional tax, but earnings from a particular employer do not exceed the $200,000 threshold for withholding of the tax by the employer, the employee is responsible for calculating and paying the additional 0.9% Medicare tax. The employee cannot request that the additional 0.9% Medicare tax be withheld from wages that are under the $200,000 threshold. However, he or she can make quarterly estimated tax payments or submit a new Form W-4 requesting additional income tax withholding that can offset the additional Medicare tax calculated and reported on the employee’s personal income tax return. For self-employed individuals, the effect of the new additional 0.9% Medicare tax is in the form of a higher self-employment (SE) tax. The maximum rate for the Medicare tax component of the SE tax is 3.8% (2.9% + 0.9%). Self-employed individuals should include this additional tax when calculating estimated tax payments due for the year. Any tax not paid during the year (either through federal income tax withholding from an employer or estimated tax payments) is subject to an underpayment penalty. The additional 0.9% Medicare tax is not deductible for income tax purposes as part of the SE tax deduction. Also, it is not taken into account in calculating the deduction used for determining the amount of income subject to SE taxes. Please contact us if you have questions about the additional 0.9% Medicare tax or any other tax compliance or planning issue. Sidebar: Individual is responsible for paying the additional 0.9% Medicare tax Josh and Anna are married. Josh’s salary is $180,000, and Anna’s wages are $150,000. Assume they have no other wage or investment income. Their total combined wage income is $330,000 ($180,000 + $150,000). Since this amount is over the $250,000 threshold, they owe the additional 0.9% Medicare tax on $80,000 ($330,000 − $250,000). The additional tax due is $720 ($80,000 × .009). Neither Josh’s nor Anna’s employer is liable for withholding and remitting the additional tax because neither of them met the $200,000 wage threshold. Either Josh or Anna (or both) can submit a new Form W-4 to their employer that will result in additional income tax withholding to ensure the $720 is properly paid during the year. Alternatively, they could make quarterly estimated tax payments. If the amount is not paid until their federal income tax return is filed, they may be responsible for the estimated tax penalty on any underpayment amount (whether the underpayment is actually income taxes or the additional Medicare taxes).