Liberals want to increase GST, Rudd

Prime Minister Kevin Rudd has seized on a report that shadow treasurer Joe Hockey hasn't ruled out a change to the goods and services tax.

Mr Rudd said it appeared the opposition was going to increase the scope of the GST to include food to pay for a $70 billion shortfall in funding for its policies.

"A goods and service tax increase seems to be the hidden part of the agenda about how they bring these things together," he told reporters in the western Sydney electorate of Greenway.

The Australian Financial Review reported that Mr Hockey said a GST hike was "part of the equation" to simplify the tax system.

Mr Hockey and shadow assistant treasurer Matthias Cormann on Wednesday categorically ruled that out, and said the report was wrong.

"... we never said we would increase GST. The AFR headline is false and the story misinterprets my words from a presser. They alone did it," Mr Hockey tweeted.

But Mr Rudd said changing the GST "is now on the Liberal party agenda".

"What we're seeing through multiple statements now by Mr Hockey ... and others is that the goods and services tax is now increasingly on the agenda," he said.

"I think this is a big, big development in this election campaign."

Mr Rudd said his government would never increase the GST or extend it to food.

"What I would say loud and clear that the Australia government I lead would not increase the GST nor would it extend its scope. That is clear cut language."

Opposition Leader Tony Abbott said there would be a comprehensive taxation White Paper in the first term of a coalition government, but he said the GST was not on the table and he would not put it there.

"I don't know what people might recommend to that but as far as I am concerned there are no plans whatsoever to change the GST," he told Adelaide radio station 5AA.

But he said the White Paper process would start with a full community consultation.

"What comes up in the consultation is up to people in the community," he said.