If economic growth would have been slower then revenues would have been lower. The whole point of enacting the tax cuts was to spur growth and increase revenue. Every time there have been cuts in the marginal tax rates, the economy has improved and Federal revenues improve. Every single time. Why you would deny this when it's easily shown makes no sense.
What I am denying is that broad based income tax cuts in the United States pay for themselves. There is some evidence that corporate income tax cuts pay for themselves, and there is some evidence that cuts in tax royalties on mining and energy exploration pay for themselves, but there is no empirical evidence that lowering tax rates from, say, 39% to 33% cause a concurrent rise in income enough to offset the losses in revenue to the treasury. It is a discredited theory in economics that virtually no economist believes.
Here is growth in GDP per capita from 1870 to 2006. Except for the Depression, growth has been pretty constant.
And here is taxes to GDP.
As you can see, the rate of growth in the economy is pretty much the same as it was 100 years ago, even though the tax burden is 5 times higher. How can this be if cutting taxes is what causes economic growth? Yes, tax cuts may have caused the little squiggles above the trend line, but they are minor.
People who make this argument vastly underestimate the American people. Americans are hard-working, productive people. Raising or lowering tax rates by 5% isn't going to change that.
The Congress under Bush raised spending considerably after they cut taxes and that is what contributed to the deficit. If they had left spending at exactly the same level they would have had a deficit for the following year and then budget surpluses every year after, assuming ceteris paribus.
And had taxes not been cut, the national debt would be $1.5 trillion lower, give or take a few hundred billion. Because of that, the tax cuts were fiscally reckless.
I noticed you quoted Laffer earlier. Do you even understand the Laffer Curve?
Yes, very well. And so does the economics community, which has rejected it outright as it applies to the broad economy.