Hi Billy ... total GST revenue around $70billion and if increased by 50% to say 15% then roughly an extra $35billion.
Johnboy just gave us a $34billion tax break so I suppose we'd be about even.
My logic gets qwerky sometimes I know ... lol
What amazes me is the size of the numbers that get thrown around by Governments both federal and state. I don't think anyone is managing the economy efficiently.