The Additional Medicare Tax is a 0.9% surtax on earned income exceeding $200,000 for single filers ($250,000 MFJ). Unlike the standard 1.45% Medicare tax which is split between employee and employer, this additional tax is paid entirely by the employee. Employers must begin withholding this tax once wages exceed $200,000, regardless of filing status.
Common paystub code: ADDL MED
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