Senator WONG (South Australia—Leader of the Opposition in the Senate) (14:30): I ask if the minister could on notice confirm that, in the longer term, stage 3 is the most expensive. I also ask him this question: why is this government stubbornly holding income tax cuts for low- and middle-income Australians, due to begin this year, hostage to tax cuts for the wealthiest 20 per cent of income earners which don't start for another six years—six years under your own time frame?