Budget plans put pressure on opposition THE coalition faces continued pressure over the GST as NSW Liberal premier Barry O'Farrell calls for an overhaul of the system while shadow treasurer Joe Hockey says he wants the Australian people to tell him how to make it fairer. The opposition's planned tax white paper, announced in reply to the federal budget, has been labelled a "GST review" by senior government ministers as Mr O'Farrell said the duty should be on the table for analysis. We haven't announced any tax changes," Mr Hockey told ABC TV on Sunday, hosing down speculation of a GST hike under a coalition government. Mr O'Farrell said changes to the GST, which raises funds for states and territories, could help remove "anti-economic" state taxes such as payroll and investment taxes. The Labor government was quick to pounce on the issue. "What Mr O'Farrell did this morning was open the curtains on this so-called tax review, which we know is going to be nothing other than a GST review," Assistant Treasurer David Bradbury told Sky News. He said Liberal states will pressure Mr Abbott for GST increases to boost their income. Mr Bradbury also swiped at the opposition for its planned delay to superannuation contribution increases, indicating the proposed two-year postponement would change to a complete cut, as was the case in the 1990s when the coalition came to power. What we see from Tony Abbott is not just a decision to defer superannuation, this is actually the forerunner to doing what (former Liberal prime minister John) Howard did. Mr Hockey said delaying the schedule of super contribution increases by two years would make little difference in the long term and put more money in the pockets of workers in the short term.