The Opposition's banking inquiry found that major banks did bolster profits at the expense of borrowers even as the Reserve Bank slashed interest rates in response to the global financial crisis, the Herald understands.

A report containing the inquiry's conclusions will be released today, it is understood.

Content leaked to the Herald supports claims banks chose to only sparingly pass through to customers the benefit of Reserve Bank rate cuts late last year and early this year.

Are banks being fair on home mortgage rate levels? Here is the latest selection of Your Views: