With regard to the government’s projection presented on page 235 of Budget 2016 showing a 21% increase in Goods and Services Tax (GST) revenues from 2015-2016 to 2020-2021: (a) upon what basis is the government’s projection based; and (b) how much of this forecasted increase will result from an increase in the GST rate?
In the House of Commons on September 19th, 2016. See this statement in context.