Despite higher top marginal tax rates, federal tax revenue as a percentage of GDP has been pretty stable post WW2<p><a href="https:&#x2F;&#x2F;research.stlouisfed.org&#x2F;fred2&#x2F;series&#x2F;FYFRGDA188S" rel="nofollow">https:&#x2F;&#x2F;research.stlouisfed.org&#x2F;fred2&#x2F;series&#x2F;FYFRGDA188S</a>