Net pay is an employee’s earnings after all deductions are taken out. Obligatory deductions such as the FICA mandated Social Security tax and Medicare are withheld automatically from an employee’s earnings. Other deductions come in the form of benefits, which may be optional. Health, dental and vision insurance, life insurance, or a retirement fund may be offered through an employer. These costs will come in the form of a deduction from the employee’s gross pay, or salary.