Wagering operators will be required to accept bets from all customers under a new condition agreed upon by the Racing NSW board.

The initiative has come in response to complaints from punters, usually successful ones, that they are being frozen out of the wagering market.

Peter V'Landys, chief executive of Racing NSW, said his organisation consulted with wagering operators before introducing the condition, which will require bookmakers to stand to lose a minimum amount on any single fixed odds bet on a thoroughbred race in NSW.

"There have been frequent and persistent complaints by punters about wagering operators refusing to take their bets, particularly in circumstances where those punters have been successful," V'Landys said.

"Racing NSW believes there is a current imbalance in favour of wagering operators at the expense of punters and this needed to be rectified."