Yes. Let me just quote from the budget papers. The personal income tax measures, in the first year--that's 2009--have a 0.4 impact. For every dollar spent, you get 40ยข. In the second year it's 0.9. Infrastructure spending in the first year is 1.0, two and a half times as much bang for that buck, and it's 1.5 in the second year. It's almost over half again as much impact in the second year. Now, those are not my numbers; those are from the budget papers themselves. The impact of personal income tax cuts is much less of a bang for the buck than the infrastructure spending. I presume that the people at the Department of Finance who made these calculations would have decided how quickly that was put in place.
On March 10th, 2009. See this statement in context.