Reduce the amount of interest you pay and pay off your first home sooner! A Mortgage Offset account offsets 100% of your savings against the balance of your loan when the loan interest is calculated. For example, if you have a loan balance of $100,000 and a Mortgage Offset account with a $20,000 balance, interest will be calculated on the difference between your loan amount and your Mortgage Offset balance. i.e. interest will be calculated on $80,000 rather than the full $100,000 owing. But please note a monthly fee of $8 applies for this account.