On page 15 of the PBO report, it's the final table and it takes a look at comparing estimates of the economic impacts of budget measures. Personal income tax measures flatlined in 2016-17, but the PBO is estimating that there's going to be a drag, a negative impact, on real GDP as a result of this personal income tax change that the government has introduced and is seeking passage of.
On April 12th, 2016. See this statement in context.