The U.S. Social Security Administration has published the OASDI and SSI Program Rates & Limits for 2021. For both employers and employees, the rate for the Social Security portion (OASDI) remains 6.20%, and the rate for the Medicare portion remains 1.45%. For the self-employed, the OASDI rate remains 12.4% and the Medicare rate remains 2.9% (15.30% combined rate). The taxable earnings cap for OASDI is increased from USD 137,700 to USD 142,800. No cap applies for Medicare.