I'm glad you mentioned "up to a certain point" because there are kooks out there who think that all tax cuts are free (similarly, other kooks think that all deficits have to be fixed with tax increases).
The economist behind the Laffer Curve, Alfred Laffer, has a poor track record for his economic forcasts, and when he worked on the Nixon economic staff, he made the only forcast that was wrong. Similarly, when he predicted in the 1980s that a 30% tax cut would result in higher government revenue, he was shown to be wrong because the Reagan tax cuts resulted in the biggest deficits ever. Some say that the deficits were caused by Congress approving more spending than the president wanted, but Laffer and many conservative politicians at the time had said that the such spending wouldn't matter because higher revenue from teh tax cuts would outstrip all spending increases. But Reagan eventually started to face up to the problem of deficits and passed tax increases, and the average tax increase during his two terms was 7% a year. This compares to 4%/year for Bush I and 7%/year for Clinton.