Sure, http://en.wikipedia.org/wiki/Tax_avoidance . Various strategies to reduce income in one year or jurisdiction and apply it to another are widespread, and I'm not sure why this would be different. I am not a lawyer, though.

The "It's a tip!" nature of this seems irrelevant to taxes: either you accept it or you don't, and if you do, you may or may not be required to pay taxes on it, depending on laws that are applied to you.