One of the last remaining features of the Affordable Care Act (ACA) that has yet to be implemented is the so-called “Cadillac tax,” which takes effect in 2018. Section 4980I will impose a 40 percent excise tax on employee benefits the cost of which exceeds certain statutory limits. The Cadillac tax is intended to limit the generosity of employer coverage on the theory that excess coverage encourages excess health care expenditures and thus drives up the total cost of health care. The tax is also, however, one of the major anticipated sources of revenue under the ACA, expected to raise $87 billion over the next 10 years.