I was preparing myself to vote NDP for the first time ever until they came out with their fiscal plan with this 38% corporate tax increase. I had hoped that them bringing in Hirsch would have mitigated the financial and economic naivety that is the NDP's main weakness. Things are going very well economically right now, why even take the risk of making fundamental fiscal changes?
They did the same thing in 2015 - a 20% increase in the tax rate that did not actually raise revenue. Now they are proposing the same thing again expecting a different result - it's absurd.
Corporate income tax rates have an immediate and material impact on after tax cashflows and consequently the IRR for every capital investment project in the province. Capital is mobile, and capital budgeting does not occur in a vacuum - so an increase such as this will have a destructive impact on capital spending. You are correct in that the extent of this impact can be masked or magnified by wider economic trends, however the impact on IRRs is simple math.