A top Treasury official has admitted that no one he knows has seen a copy of the Abbott government’s Commission of Audit report yet, despite Coalition promises it will be released before the May 13 budget, which is less than a month away.

It comes as leading economist John Quiggin, an Australian Research Council Federation fellow, slammed the Commission of Audit as a “piece of political theatre,” saying there is no way in which its outcomes will be serious.

"It may be that others have seen it and have been sworn to secrecy, but I'm not aware of anyone having seen it": Rob Heferen. Credit:Alex Ellinghausen

Appearing before a senate select committee on Tuesday, the executive director of the Federal Treasury’s Revenue Group, Rob Heferen, told federal senators he had not yet seen the Commission of Audit report.

Mr Heferen, when asked by Labor Senator Sam Dastyari if he had seen the report, said no one in Treasury had, to his knowledge.