A former New South Wales treasury official says fifty per cent of registered clubs in the state don’t pay any tax at all on the money they make from poker machines.

Casino Club NSW: Profits, tax, sport and politics is the title of Betty Con Walker’s book, released this week.

Con Walker says she wrote the book because she was disenchanted by politicians who opposed increasing taxes on the three billion dollars that clubs make out of gaming each year.

She says the taxes on clubs are unnecessarily low and are far below the rates paid by the clubs’ competitors in the hotel industry.

2SER's Fergus Grieve asked Betty Con Walker just how big a tax advantage clubs have over the competition.