The Commonwealth Bank is expected to unveil a record profit of almost $9.5 billion this week, which may further fuel the political debate over banks triggered by last week's skinny mortgage interest rate cuts.

The country's largest lender will deliver its full-year earnings on Wednesday, a week after the government and Opposition both rounded on banks, accusing them of putting shareholders before customers by passing roughly only half of the cut in official interest rates to borrowers.

Analysts are forecasting CBA's profits for the year to June will be $9.48 billion, an increase of 3.7 per cent from last year, though some are tipping a softer second half of the year and warning the bank faces "headwinds".

It is forecast to leave its final dividend flat at $2.22 a share, as earnings per share growth has been curtailed by the $5 billion capital raising it launched this time last year.