(1) On behalf of the Commonwealth, the Secretary may waive the Commonwealth's right to recover the whole or a part of a debt from a debtor only in the circumstances described in section 92 , 93 , 94 or 95 .
(2) A waiver takes effect:
(a) on the day specified in the waiver (whether that day is before, on or after the day the decision to waive is made); or
(b) if the waiver does not specify when it takes effect--on the day the decision to waive is made.
Note: If the Secretary waives the Commonwealth's right to recover all or part of a debt, this is a permanent bar to recovery of the debt or part of the debt and the debt or part of the debt effectively ceases to exist.