Depending on the tax cuts, they can boost the economy. More money in the pocket of the workers, the more that gets spent and the more jobs required to produce such demand. Tax cuts on businesses means more money for investing, more money for hiring and more profit which usually means employee bonuses and pay raises. All of this means more spending, which boosts the economy. This fact is obtained from graphs of tax revenues, GDP growth and lifestyle changes for the past few decades. This is one way to boost the economy as well as tax revenues. On the other hand, if you increase taxes, you only increase tax revenues but not the economy.