'Bridge too far': commissioner calls out WA GST attack

The productivity commissioner has accused the West Australian premier of crossing a line after his criticism of the body's report into the state's generous GST deal.

A Productivity Commission report found the "perverse" GST deal struck in 2018 by the Morrison government had cost federal taxpayers $23 billion in top-up payments to WA so far and said it needed to be scrapped.

Following the report's release, WA Premier Roger Cook described the commission as "east coast clowns" and said the recommendations were an attack on the state.

Prime Minister Anthony Albanese has since promised to keep WA's GST deal intact.

Productivity Commissioner Angela Jackson said Mr Cook's comments about the report went too far.

"Our view is that a line was crossed in terms of the nature of those comments from the Western Australian premier ... he also called the report deceitful," she told ABC Radio on Wednesday.

"To undermine and, I guess, attack our integrity ... is an additional bridge too far, and ... something more broadly we are seeing in public debate internationally.

Dr Jackson will meet with WA Treasurer Rita Saffioti in Melbourne on Wednesday, where concerns about Mr Cook's comments will be conveyed.

The commissioner said the prime minister's comments about keeping the GST deal for WA was disappointing but agreed the commission's staff were "economic rationalists", as described by Mr Albanese.

"It's important for us to indicate that that process will not be influenced by the prime minister's comments," Dr Jackson said.

"I would say that yes, we are economists. I hold a PhD in economics, as does my colleague Dr Alex Robson … so we are definitely economic rationalists."

The body will still take feedback on the GST proposal before it hands down its final report by the end of 2026.

Industry Minister Tim Ayres said while the comments from the WA premier towards the commission were colourful, different points of view should be welcomed.

"We're an Australian democracy. We should be we should be comfortable and confident about the way that we engage with each other," he told ABC Radio.