Additional Medicare Tax Withholding 2024 Date.  — the additional medicare tax is an extra 0.9% tax on top of the standard tax payment for medicare.  — if you make a specific amount of income, you could be subject to additional medicare tax of 0.9%.

Employers must share fica payments with employees. Starting with the 2013 tax year, you may be subject to an additional 0.9 percent medicare tax on wages that exceed a certain threshold.