Gaming giant Tabcorp Holdings has taken a big hit of $11.5 million to its accounts after a high-rolling gambler passed a dud cheque at one of the company's casinos.

Releasing its financial results for the first half of the 2008/09 financial year, Tabcorp said on Thursday that it had made a bad debt provision of $11.5 million in respect of one customer.

Tabcorp chief executive Elmer Funke Kupper told reporters that Tabcorp did not provide credit to players but did provide cash-chequing facilities.

Asked if the player in question had cashed a cheque for $11.5 million and the cheque had bounced, Mr Funke Kupper said: "Yep''.

Mr Funke Kupper declined to identify the player or the country of origin, but said the gambler was an international player known throughout the region.