Australia's biggest bank is reviewing its own books after thousands of staff are claiming they have been shortchanged on superannuation.

Commonwealth Bank has allegedly underpaid up to 7000 of their staff at the lower end of the pay scale, since 2009.

Australian correspondent Donna Demaio told Andrew Dickens Commonwealth Bank's underpaying has added to a serious issue.

"We know that underpayment has been a significant problem in the past in the superannuation industry. They will look into the matter and find out exactly what has been going on."

LISTEN ABOVE AS AUSTRALIAN CORRESPONDENT DONNA DEMAIO SPEAKS WITH ANDREW DICKENS