Additional Medicare Tax Rate 2024 Lok. Form 8959 is used to calculate how much additional medicare tax you may owe, depending on the type of income you earn. For high earners, the additional medicare tax amounts to an additional 0.9% on top of the standard medicare tax rate.
โ the additional medicare tax combines the typical medicare tax rate with the 0.9% surtax, totaling 2.35%. โ in 2024, the medicare tax rate is 2.9%, split evenly between employers and employees.