Last week, the big four banks - ANZ, Westpac, Commonwealth Bank and National Australia Bank - all announced a rate rise of 25 basis points following the RBA's decision to raise the official cash rate for the first time in 19 months.

An increase in interest rates of 25 basis points means an extra $35 per month on a $250,000 mortgage.  This round of rate rises is not set to be the last.  Forecasters are predicting further rate rises by the RBA in November, and several more next year.  The cash rate is predicted to rise from 3.25% to at least 5% by this time next year.  This will mean more rate rises for home owners and could see mortgage rates increase to around 8 per cent within the next 12 months.