Whether a defendant charged under 26 U.S.C. §§ 7201 and 7203 must have voluntarily and intentionally violated a known legal duty to have acted “willfully.”
Holding
Yes. In the criminal tax statutes, willfulness means the voluntary, intentional violation of a known legal duty.
Reasoning
The usual criminal-law rule is that ignorance or mistake of law does not excuse an offense. But Congress used “willfully” in the criminal tax statutes against the background of a complex tax system, where even taxpayers attempting to comply may misunderstand their legal obligations.
The Court’s precedents establish the governing definition. United States v. Bishop described willfulness as a voluntary and intentional violation of a known legal duty, and United States v. Pomponio confirmed that this definition, rather than proof of some additional evil motive, supplies the required mental state.