Your link shows the ratio decreasing from 16.97% to 16.16% in 2018 when the bill went into effect. That’s a 5% decrease, which agrees with my above math.
Overall your chart shows the ratio has a range of 19.75% to 14.42% in the past 20 years, tracking changes to the tax code and business cycle, exactly in the way you’d expect. That’s a 36% difference between the min and max ie. not flat.
I think lawmakers supporting tax cuts try to claim that tax revenues are not sensitive to tax rates because it would be convenient if true when trying to pass a tax cut. The facts don’t bear it out, however.
I think the roots of this argument are in the theory of the Laffer Curve: https://en.m.wikipedia.org/wiki/Laffer_curve
The Laffer Curve was used to argue for tax cuts when the top marginal rate was 70%. People are still trying to make this argument, but I think they missed the part where it’s supposed to be a curve, so the result of cutting taxes from 70% is not the same as cutting them from 35%.
Overall your chart shows the ratio has a range of 19.75% to 14.42% in the past 20 years, tracking changes to the tax code and business cycle, exactly in the way you’d expect. That’s a 36% difference between the min and max ie. not flat.
I think lawmakers supporting tax cuts try to claim that tax revenues are not sensitive to tax rates because it would be convenient if true when trying to pass a tax cut. The facts don’t bear it out, however.
I think the roots of this argument are in the theory of the Laffer Curve: https://en.m.wikipedia.org/wiki/Laffer_curve The Laffer Curve was used to argue for tax cuts when the top marginal rate was 70%. People are still trying to make this argument, but I think they missed the part where it’s supposed to be a curve, so the result of cutting taxes from 70% is not the same as cutting them from 35%.