The Department of Finance based its calculations on certain assumptions, specifically that contributors would not behave any differently. Based on that assumption, it concluded that additional costs would be in the order of $565 million.
We're talking here about the cost to the federal government. We can't lose sight of the fact that there will also be a cost to the provinces, given that the deduction would affect their tax base and hence their revenues. Provincial costs must therefore be added to federal costs.