The Commissioner of the Internal Revenue Service, Charles Rettig, testified before the Senate Finance Committee. His message was a clear one: He is an enforcement-minded commissioner and “the IRS is committed to pursuing those who . . . intentionally evade their tax obligations.” Mr. Rettig did not mince words. His IRS will “aggressively pursue non-compliant taxpayers . . . with visible civil and criminal enforcement efforts.” But the message, though a stern one, is also one of fairness: Honest taxpayers need to believe—to feel confident—that others are paying their fair share, whether voluntarily or through enforcement efforts.