Spies evasion is a more serious offense than a simple misdemeanor for non-filing your tax return. This is because the mere non-filing of a tax return is typically a Section 7203 misdemeanor, while a Spies evasion offense may cause that offense to rise to the level of a Section 7201 felony—and a felony is a more serious offense than a misdemeanor. When might a simple Section 7203 misdemeanor for non-filing of a tax return rise to a Section 7201 felony? The answer is when one fails to file a return, and that is coupled with an affirmative action of evasion—commonly called “Spies evasion.”