“If you cut that [corporate] tax rate to 15 percent, it will pay for itself many times over. … This will bring in probably $1.5 trillion net by itself.”

That’s wishful thinking. So is most Republican rhetoric around tax cutting. In reality, there’s no evidence that a tax cut now would spur growth.

…Moreover, GOP tax mythology usually leaves out other factors that also contributed to growth in the 1980s: First was the sharp reduction in interest rates by the Federal Reserve. The fed funds rate fell by more than half, from about 19 percent in July 1981 to about 9 percent in November 1982. Second, Reagan’s defense buildup and highway construction programs greatly increased the federal government’s purchases of goods and services. This is textbook Keynesian economics.

…I’m not sure how many Republicans even know anymore that Reagan raised taxes several times after 1981. His last budget showed that as of 1988, the aggregate, cumulative revenue loss from the 1981 tax cut was $264 billion and legislated tax increases brought about half of that back.

…Despite huge tax cuts almost annually during the George W. Bush administration that cost the Treasury trillions in revenue, according to the Congressional Budget Office, growth collapsed in the first decade of the 2000s. Real GDP rose just 19.5 percent, well below its ’90s rate.

I helped create the GOP tax myth. Trump is wrong: Tax cuts don’t equal growth. – The Washington Post

hmmm