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For use in 2024. Released Dec 05, 2023. What's New: Social security and Medicare tax for 2024. The social security tax rate is 6.2% each for the employee and employer. The social security wage base limit is $168,600. The Medicare tax rate is 1.45% each for the employee and employer, unchanged from 2023. There is no wage base limit for Medicare tax. Social security and Medicare taxes apply to the wages of household workers you pay $2,700 or more in cash wages in 2024. Social security and Medicare taxes apply to election workers who are paid $2,300 or more in cash or an equivalent form of compensation in 2024.