The classic case usually presented as evidence that tax cuts increase revenue is Reagan's tax cut back in 1981. The problem is that federal revenue measured in constant dollars actually decreased after the 1981 tax cuts. It only looks like an increase when you ignore the rather high inflation rate during those years.
Wrong. Second graph under 2. National Budget:
Receipts, Outlays, Surplus and Deficit in Current Dollars (amounts in millions)
Receipts go up, up up, all through the 1980's, adjusted for inflation [it's not monotonic, but 1988 is far ahead of 1980). There is a substantial drop starting when the Clinton recession kicked in just before he left office, but now revenues are higher than ever after the Bush tax cuts.
There is no evidence that we are to the left of the Laffer curve maximum. If anything, the evidence suggests that we are far to the right.
Running a deficit is a different matter, and both Reagan and Bush should have done better there. Reagan at least had a democrat Congress to wrestle with, but Bush has no excuse for most of his two terms.
EDIT - for disambiguity - it's the SECOND graph under section 2. in the link that has been adjusted for inflation.
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