The cut lowers Commonwealth Bank's variable mortage rate to 5.74 per cent from Februrary 13.
However, Ross McEwan, head of retail banking at Commonwealth Bank warned the bank may not pass on future interest rate cuts.
"As the world economic crisis continues and the current pressure remains on funding costs, any future changes in interest rates will need to reflect these higher costs of funds," said Mr McEwan.
"On this basis, we may not be able to pass on in full any future interest rate cuts."
Large banks take beating on Wall Street
Dollar lower on stronger greenback
Dollar falls to fresh low
GM to end jobs bank Monday