Ethical Decision making Model

Scenario:

Brad Shoreman is a drummer in a band based out of Southern Ontario. He asks you to help him with his personal tax return. He believes that any cash "gigs" should not be included in his personal income because they are not traceable and the government gets enough of his money. You like their music and enjoy the free tickets supplied to you. What will you do when he demands that this revenue not be included?

What are the options/alternatives?