(4) Voluntary payments for the recovery of accidental overpayment of wages when the following conditions are met:
(A) The recovery is agreed to in writing.
(B) The deduction for the overpayment begins one pay period following the date the parties execute the written agreement.
(C) The written agreement specifies:
(i) The date the recovery of the overpayment will begin and end.
(ii) The amount to be deducted, which shall be agreed upon by the employer and the employee but which shall, in no event, be more than 20 percent of the employee's gross pay in any pay period.
(iii) A specific agreement regarding whether the employer is allowed to deduct any amount outstanding from final wages at the termination of employment.