The Commonwealth Bank of Australia (CBA) denies its corporate lending standards have slipped, as it forecasts write-downs for 2008-09. Investors were told that the bank's credit quality is sound, despite having the biggest exposure among the top Australian banks following the financial troubles of borrowers Allco Finance Group and Centro Properties. In its May 2008 update, CBA estimated that out of total loans, its bad debts will account for 0.23%, with an estimated value of $A800 million