Overview
Title IV is the enforcement engine behind the insurance reforms in Title I. Title I wrote portability, non-discrimination, and renewability rules into ERISA and the Public Health Service Act; Title IV carried those same requirements into the Internal Revenue Code, attached a tax penalty for violating them, and clarified the COBRA continuation-coverage rules.
Because the identical requirements now sit in three statutes, a single violation can reach three federal agencies — the IRS, the Department of Labor, and HHS.
Three statutes, three enforcers
The tax code rules (chapter 100) are enforced by the IRS through an excise tax; the ERISA rules are enforced by the Department of Labor and through participant lawsuits; and the Public Health Service Act rules are enforced by HHS. Congress deliberately duplicated the requirements so that no group health plan could slip out of them by falling outside a single statute.