Calculate the amount of FICA: Social Security Tax and Medicare Tax to be withheld from each of the employee's gross (December only). Apply a 6.2 percent as a social security tax rate using the annual limit of the contribution and benefit base. For earnings in 2016, this base is $118,500. Also, apply a 1.45 percent as a Medicare tax rate. Employee December Salary The year-todate earnings up to November Social Security Tax (December, 2016) Medicare Tax (December, 2016) Rod Cast $2,900 $ $ $ Veronica Ergo 10,800 Ann Lola 9,650