Wage Limit For Additional Medicare Tax 2024. — the resulting maximum social security tax for 2024 is $10,453.20. The additional medicare tax is for high earners and is the sole financial responsibility of the employee and is not split.
— in addition, employees must pay medicare tax on all wages. For 2024, the medicare surtax thresholds are set to impact single filers with an adjusted gross income (agi) above $200,000 and married couples filing jointly with an agi.