Crossbenchers oppose any GST change

A group of crossbenchers wants the Turnbull government to consider taxes on banks and financial transactions before changes to the GST.

Nick Xenophon, Glenn Lazarus, Bob Katter and Andrew Wilkie fronted the media on Wednesday to claim the GST disproportionately hits low-income earners.

Mr Katter said the government was putting its toe in the water, "and we just threw a few piranha into the water today".