What did severability mean in the challenges to the Affordable Care Act?

In the context of legal challenges to the Affordable Care Act (ACA), severability refers to the judicial determination of whether a specific provision—such as the individual mandate—can be removed from a law without invalidating the entire statute.12

When courts found a provision of the ACA unconstitutional, the question of severability became central to whether the rest of the law could remain in effect. If a provision is deemed "severable," the court may strike down only that portion while leaving the remainder of the legislation intact. Conversely, if a provision is found "not severable," the court may conclude that the entire act must be declared unconstitutional because the invalid portion is considered essential to the law's overall function.12

In several high-profile cases, such as State of Florida et al. v. United States Department of Health and Human Services et al. and Texas v. United States, lower courts grappled with whether the individual mandate was so integral to the ACA that its invalidation necessitated the collapse of the entire act.12