The treatment of small business by financial institutions will be investigated by the banking royal commission today, as fees, improper lending practices and asset fire sales come under scrutiny.

Nationals senator John Williams expects Commonwealth Bank subsidiary Bankwest to be focused upon in the hearings, as he said many farms and small businesses have their seized assets sold for far below their market value.

Council of Small Business Australia deputy chair David Gandolfo said he does not expect there to be the same degree of failure in this round of the royal commission.