This may differ in other countries or may have changed in the twenty years since, but after a decade consulting on research projects that paid $30k, I was suddenly contractor to a big national ISP making three times that. Yes, we went a little nuts with buying things, we were young, etc. What I didn't expect was the tax bill! Taxman wanted nearly half!

As a LLC, your personal tax is only on what you pay yourself, your corporation pays way less on the rest.

There are formalities of course, AGM, official seal etc, but in a one-person LLC, these are mostly a joke.