This guide covers the whole of employer immigration compliance, from the first day of a new hire through a contested penalty hearing. It explains the verification obligation, section by section, and the document rules that generate most violations. It treats E-Verify separately — enrollment, case creation deadlines, tentative nonconfirmations, and the misuse that creates discrimination liability. It sets out the anti-discrimination provision, the charge process, and the practices that violate it. It walks through a notice of inspection from service to settlement, including what may lawfully be corrected and what may not. It covers constructive knowledge, no-match letters, contractor and staffing arrangements, and successor liability in acquisitions. It closes with an internal audit protocol, penalty mitigation strategy, and the state-law overlay.