Senator BIRMINGHAM (South Australia) (14:24): My question is to Senator Wong, the Minister for Finance and Deregulation and Minister representing the Minister for Climate Change and Energy Efficiency. Will the minister guarantee that full revenue forecasts associated with the sale and auction of permits under Labor's carbon tax will be published in the forward estimates of this year's budget papers for the 2015-16 budget year when the carbon tax moves from a fixed price to a floating price?