Could you speak as an individual on this? The first thing this bill does is to make changes to work-in-progress. Eventually, 20% at a time, of the billing that's due at the end of the year, even if you haven't yet received the money for the work that's been done, it's assumed that you have received it, so you have to make a payment to the government.
On November 7th, 2017. See this statement in context.