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. Our system was recently updated to include this tax on your most recent paycheck. You may have earned $200,000 this year prior to our system update, so we were required to do a “catch- up” withholding to ensure that all wages over $200,000 were taxed. For this reason, your withholding for the additional Medicare tax was greater than 0.9% on this check. Going forward, this tax will be withheld on each paycheck at 0.9%.