Section 7(4)(c) requires an employee be given written notice at least one pay period in advance of an overpayment deduction. In some states, like Michigan, notifying the employee in writing is a requirement.The salary overpayment resulted because . The most common causes of overpayment are 1) complex pay scales, 2) missed clockouts, 3) human error, and, 4) miscommunication. This model letter as a legally approved form for a client to use when informing an employee about correcting a wage overpayment. File Form SSA-632, Request for Waiver of Overpayment Recovery. Utilize our free unpaid wages demand letter template to create a demand letter for unpaid wages.