The U.S. Social Security Administration has published a fact sheet for the 2017 Social Security rates and cap. The rate for the Social Security portion (OASDI) remains 6.20%, and the rate for the Medicare portion remains 1.45%. The taxable earnings cap for OASDI is increased from USD 118,500 to USD 127,200. No cap applies for Medicare. Click the following link for the 2017 Social Security fact sheet.