If your client has built up an overpayment reserve they can use it to lower their repayments for a period if they need to.
When your client has underpaid, their outstanding balance will be recalculated. Monthly payments will be recalculated at the next rate change or at the end of the year (whichever is first) to take any underpayment into account to ensure the mortgage is repaid in full by the agreed date.
Terms & conditions apply.