Is given in a manner reasonably calculated to give actual notice to the employee or successor. We have identified the following overpayment and are in good faith voluntarily refunding all monies collected in error.The salary overpayment resulted because . The state may require that the employer obtain the employee's written consent in order to make the paycheck adjustment. The law basically states that an overpayment is treated as an advance that can be deducted from future paychecks. Improper Payment: A benefit payment to a worker that is either higher or lower than it should be. This includes both overpayments and underpayments.