I think it's a critically important piece of context that Canadian corporate taxes have been cut to the bone in recent years. They're much lower than American and Japanese corporate tax rates, for example.
As a result, corporate profits have increased to their highest level, relative to gross domestic product ever. Since we started keeping those statistics, we've never seen corporate profits as large, as a share of the economy, as they are now.
The flip side is that business investment in the Canadian economy is at very sluggish levels. It's at low levels compared to where it's been at other points in Canadian history and compared to where it is in other countries. So it's certainly not clear that these corporate tax cuts have produced a lot of economic benefits. The case for further corporate tax reductions is really questionable.
I'd also point out that one consequence of corporate profits being so large is that the cost of corporate tax cuts is also very large. We're talking in the tens of billions of dollars from cuts that have already been made. So you're absolutely correct about that.