An Offset mortgage is a type of mortgage product that allows you to link your mortgage borrowing to your savings, and use the balance in savings to offset against the amount of interest that is charged on your mortgage. For example if you had £100,000 mortgage balance but £20,000 in the linked savings account, the lender would only charge interest on £80,000 – so without physically using your savings to pay off against the mortgage, it can help to reduce your mortgage quicker or reduce your monthly payments.