NFIB v. Sebelius, 567 U.S. 519 (2012), is a landmark United States Supreme Court decision that upheld the core provisions of the Patient Protection and Affordable Care Act (ACA) of 2010, including the individual mandate requiring most Americans to obtain health insurance or pay a penalty. The case is among the most consequential constitutional rulings of the 21st century, addressing the scope of Congress's power under the Commerce Clause, the Necessary and Proper Clause, and the taxing power, as well as the limits of federal authority over state governments under the Spending Clause.

The National Federation of Independent Business, joined by twenty-six states and individual plaintiffs, challenged the ACA on the grounds that the individual mandate exceeded Congress's enumerated powers and that the law's Medicaid expansion unconstitutionally coerced states. The case consolidated multiple lower-court challenges and was argued before the Supreme Court over three days in March 2012.

Chief Justice John Roberts, writing for a divided Court, provided the decisive reasoning. He concluded that the individual mandate could not be sustained under the Commerce Clause or the Necessary and Proper Clause, reasoning that Congress may not compel individuals to enter commerce in order to regulate them. However, he construed the mandate's penalty as a tax and upheld it under Congress's broad taxing power. On the Medicaid expansion, a majority held that conditioning all existing Medicaid funding on state acceptance of the expansion was impermissibly coercive; the remedy left states free to decline the expansion without losing prior Medicaid funds. Four justices would have upheld the mandate under the Commerce Clause; four others would have struck down the ACA in its entirety.

The ruling left the ACA in effect while simultaneously articulating new limits on the Commerce Clause and the Spending Clause. The Commerce Clause and Spending Clause limits articulated in the decision remain actively litigated and contested in scholarship and subsequent litigation.

- The individual mandate is a legitimate exercise of the taxing power. Roberts's controlling opinion holds that the mandate functions as a tax on the choice not to purchase insurance, placing it within Congress's broad authority to lay and collect taxes. nfib-v-sebelius-taxing-power-upheld-viewpoint

- The mandate exceeded Commerce Clause authority. A majority of the Court, including Roberts, concluded that the Commerce Clause does not permit Congress to compel individuals to engage in commerce. This reading represents a significant doctrinal limit on prior expansions of federal regulatory power. nfib-v-sebelius-commerce-clause-limits-viewpoint

- The Medicaid expansion ruling improperly empowers states to resist federal programs. Critics of the Spending Clause holding argue that the Court's coercion doctrine is unworkable and that it provides a mechanism for states to partially accept federal programs, fragmenting national policy. nfib-v-sebelius-medicaid-coercion-viewpoint

- The ruling reflects judicial overreach in rewriting the statute. Some critics contend that Roberts's majority construed the mandate as a tax only by departing from the text and intent of the ACA, effectively rewriting legislation to save it. nfib-v-sebelius-judicial-rewriting-viewpoint

- The decision properly restrains federal power. Proponents of the Commerce Clause and Necessary and Proper Clause holdings argue the ruling enforces meaningful limits on congressional authority consistent with a government of enumerated powers. nfib-v-sebelius-federal-limits-viewpoint

- Roberts's switch and deliberative process: Reports emerged after the decision that Roberts had initially joined the four dissenters before changing his vote, raising questions about judicial independence and external pressure on the Court. nfib-v-sebelius-roberts-deliberation-controversy

- Coercion doctrine workability: The Medicaid holding established a constitutional limit on Spending Clause conditions that lower courts and scholars have struggled to define with precision, generating ongoing litigation and disagreement. nfib-v-sebelius-spending-clause-coercion-controversy

- Characterization of the mandate as tax versus penalty: The ACA's text called the payment a “penalty,” yet Roberts construed it as a tax for constitutional purposes while other provisions of law treated it differently, producing persistent interpretive disputes. nfib-v-sebelius-penalty-tax-characterization-controversy

- nfib-v-sebelius-history - Legislative and judicial history of the ACA and the challenges leading to the ruling - Commerce Clause - The constitutional provision at the center of the mandate challenge - Necessary and Proper Clause - Secondary constitutional basis addressed by the Court - nfib-v-sebelius-commerce-clause-limits-debate - Debate over the scope and durability of the ruling's Commerce Clause holding - nfib-v-sebelius-taxing-power-upheld-viewpoint-debate - Structured exchange between the taxing-power and commerce-clause positions - patient-protection-and-affordable-care-act - The legislation at issue - United States v. Lopez - Earlier Commerce Clause decision providing doctrinal context - gonzales-v-raich - Competing Commerce Clause precedent frequently invoked in the litigation - Medicaid - Federal-state program whose expansion was challenged under the Spending Clause

1. NFIB v. Sebelius, 567 U.S. 519 (2012). 2. Patient Protection and Affordable Care Act, Pub. L. No. 111-148, 124 Stat. 119 (2010). 3. Jack M. Balkin, “The Constitutionality of the Individual Mandate for Health Insurance,” New England Journal of Medicine 362, no. 6 (2010): 482-483. 4. Randy E. Barnett, “Commandeering the People: Why the Individual Health Insurance Mandate Is Unconstitutional,” NYU Journal of Law & Liberty 5, no. 3 (2010): 581-637. 5. Ilya Somin, “The Individual Mandate and the Limits of the Commerce Power,” Cato Supreme Court Review (2011-2012): 27-64. 6. Josh Blackman, Unprecedented: The Constitutional Challenge to Obamacare (New York: PublicAffairs, 2013). 7. David B. Kopel and Clayton E. Cramer, “The Supremes' Obamacare Double Cross,” Washington Times, July 2, 2012 (reporting on post-decision accounts of the Court's deliberations). 8. Lynn A. Baker and Mitchell N. Berman, “Getting off the Dole: Why the Court Should Abandon Its Spending Doctrine, and How a Too-Clever Congress Is Trapping It into Doing So,” Indiana Law Journal 78, no. 1 (2003): 459-522 (background on Spending Clause coercion doctrine).