The Sydney-headquartered bank saw a decline in funds under administration and felt the pinch of ongoing regulatory costs during the third quarter.

The Commonwealth Bank of Australia's wealth management business saw funds under administration dip 2 per cent over the three months to the end of September.

CBA said the decline in funds under administration, for which it gave no number, was partially offset by exchange rate movements and investment performance. Statutory net profit was down marginally from A$2.4 billion ($1.7 billion) in the corresponding period of last year to A$2.3 billion. The firm reported unaudited cash earnings of A$2.4 billion but gave no figures for 2014 with which to compare this, stating that income growth was similar to a year ago. 

Group net interest margin was slightly lower over the quarter, which the bank attributed to higher liquid assets, while trading income also declined but again, the bank gave no figures for these. This publication has contacted CBA for further information and will update in due course.

Meanwhile, over the quarter, operating expenses grew amid ongoing regulatory and compliance costs as well as foreign exchange impacts. Last month, the Australian Securities and Investments Commission announced CBA will refund around 8,400 customers a total of A$7.6 million for failing to apply fee waivers and other measures.

Australia's four major banks - CBA, Westpac, Australia and New Zealand Banking Group and National Australia Bank - have all come under pressure from the tightening of capital regulations.

CBA's Basel III common equity tier one ratio increased 70 basis points to 9.8 per cent.