Now is the time of the year some people consider paying 12 months of interest upfront to claim the tax deduction in this financial year. If you have sold a property and have a capital gain liability, or have come into some money via a bonus or something, paying the interest upfront and claiming the deduction this year can be a good way to reduce the tax bill for the year.
Many lenders will offer a discount on the interest rate for paying in advance, for example Commonwealth Bank have an interest rate of 6.54% for paying 1 year upfront if you are on their professional package. This is less than the discounted variable rate, of course you are taking a risk as to what interest rates will do over the next 12 months.