Canada’s Tax Revenues Steady As They Lowered Corporate Tax Rates

The chart shows Canada’s federal corporate tax revenues as a share of gross domestic product (GDP) and the federal corporate tax rate. The tax rate plunged from 38 percent in 1980 to just 15 percent by 2012. Amazingly, there has been no obvious drop in tax revenues over the period.

Canadian corporate tax revenues have fluctuated, but the changes are correlated with economic growth, not the tax rate. In the late 1980s, a tax rate cut was followed by three years of stable revenues. In the early 1990s, a plunge in revenues was caused by a recession, and then in the late 1990s revenues soared as the economy grew.

In 2000, Canadian policymakers enacted another round of corporate tax rate cuts, which were phased in gradually. Corporate tax revenues initially dipped, but then they rebounded strongly in the late 2000s.

The rate cuts enacted in 2000 were projected to cause substantial revenue losses to the Canadian government. That projection indicates that the reform didn’t have much in the way of legislated loophole closing. But the chart shows that the positive taxpayer response to the rate cut was apparently so large that the government did not lose much, if any, revenue at all.

In 2009, Canada was dragged into a recession by the elephant economy next door, and that knocked the wind out of corporate tax revenues. However, it is remarkable that even with a recession and a tax rate under 20 percent, tax revenues as a share of GDP have been roughly as high in recent years as they were during the 1980s, when there was a much higher rate. Jason Clemens of the Macdonald-Laurier Institute notes that Canadian corporate tax revenues have been correlated with corporate profits, not the tax rate.

If a corporate tax rate is high, there is a “Laffer effect” when the rate is cut, meaning that the tax base expands so much that the government doesn’t lose any money. Estimates from Jack Mintz and other tax experts show that cutting corporate tax rates when they are above about 25 percent won’t lose governments any revenues over the long run.

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