Westpac's full-year annual group profit fell 7 per cent or A$567 million which the bank blamed on "a number of significant infrequent items".
Net group profit fell from A$8.01 billion for the year to September 30, 2015 to A$7.44b for the year to September 30, 2015, the accounts showed.
"The 7 per cent reduction reflected higher impairment charges in full year 2016 compared to full year 2015 and a number of significant infrequent items in full year 2015 which in aggregate added A$347m to net profit after tax which were not repeated in full year 2016," the bank said.
Westpac New Zealand's cash earnings decreased 4 per cent to $872m.
"Loans grew 9 per cent, however, intense competition for new lending and a shift to lower-spread fixed rate mortgages has compressed margins," the bank announced.