K.S. Puttaswamy v. Union of India (2017)

K.S. Puttaswamy v. Union of India is the landmark constitutional judgment delivered on 24 August 2017 by a nine-judge bench of the Supreme Court of India, holding unanimously that the right to privacy is a fundamental right intrinsic to the right to life and personal liberty guaranteed by Article 21 of the Constitution, and to the freedoms enshrined in Part III. The case originated as a writ petition filed by Justice K.S. Puttaswamy, a retired judge of the Karnataka High Court, challenging the Aadhaar biometric identification scheme on the ground that it violated privacy. The threshold legal question was whether privacy was constitutionally protected at all, because two earlier rulings — the eight-judge bench in M.P. Sharma v. Satish Chandra (1954) and the six-judge bench in Kharak Singh v. State of U.P. (1962) — had observed that privacy was not a guaranteed right. Because those benches were larger than the standard constitution benches that had subsequently recognized privacy in narrower contexts, a reference to a nine-judge bench became procedurally necessary to settle the conflict authoritatively.

The procedural path is instructive for understanding how the Indian apex court resolves doctrinal contradictions. When the Aadhaar matters came before smaller benches, the Union of India argued that no fundamental right to privacy existed, relying on M.P. Sharma and Kharak Singh. A three-judge bench, recognizing it could not overrule those larger benches, referred the privacy question to a Constitution Bench, which in turn referred it to a bench of nine judges — the number required to definitively overrule an eight-judge precedent. The nine judges heard only the discrete constitutional question of whether privacy is a fundamental right; they did not decide the validity of Aadhaar itself, which returned to a five-judge bench for adjudication in 2018. This bifurcation — settling the abstract constitutional principle first, then applying it to the specific statute — is characteristic of reference jurisdiction under the Court's practice.

The bench produced six concurring opinions authored by Justices J.S. Khehar (the Chief Justice), J. Chelameswar, S.A. Bobde, R.F. Nariman, D.Y. Chandrachud (writing for himself and three others), and S.K. Kaul. The unanimous conclusion expressly overruled the contrary observations in M.P. Sharma and Kharak Singh. The Court located privacy not in any single provision but as a penumbral right flowing from the guarantees of life, liberty, and dignity across Part III. Critically, the judgment held that privacy is not absolute and articulated the proportionality test as the standard for permissible state intrusion: any restriction must be sanctioned by law, pursue a legitimate state aim, and bear a rational and proportionate nexus between the means adopted and the object sought. Justice Chandrachud's plurality opinion also formally overruled ADM Jabalpur v. Shivkant Shukla (1976), the Emergency-era habeas corpus case that had suspended access to courts for life and liberty.

The decision carries continuing relevance across Indian governance and policy ministries. It directly shaped the constitutional architecture of the Aadhaar (Targeted Delivery of Financial and Other Subsidies, Benefits and Services) Act, 2016, whose validity the Court partially upheld in September 2018 while striking down provisions permitting private entities to demand Aadhaar authentication. The privacy ruling underpinned the data-protection framework that culminated in the Digital Personal Data Protection Act, 2023, enacted after the B.N. Srikrishna Committee report of 2018. It was also the doctrinal foundation for Navtej Singh Johar v. Union of India (2018), which decriminalized consensual same-sex relations by reading down Section 377 of the Indian Penal Code, and for Joseph Shine v. Union of India (2018) striking down the adultery offence.

Puttaswamy must be distinguished from adjacent concepts. It is not itself the Aadhaar judgment; the 2018 five-judge decision in the same litigation, often cited as Puttaswamy (Aadhaar), is a separate ruling applying the privacy principle to the biometric scheme. The right to privacy is also distinct from the basic structure doctrine established in Kesavananda Bharati v. State of Kerala (1973), which limits Parliament's amending power; privacy is a Part III fundamental right, not necessarily a basic feature, though dignity-linked rights interact with that doctrine. The proportionality standard it imported is likewise distinct from the older "reasonable restrictions" formulation under Articles 19(2) to 19(6), drawing instead on German and European constitutional jurisprudence and the Canadian Oakes test.

Controversies and edge cases endure. The 2018 Aadhaar verdict's majority upheld the project's core, prompting a vigorous dissent by Justice Chandrachud, who held the entire Act unconstitutional partly because it was passed as a Money Bill under Article 110 to bypass the Rajya Sabha. The Money Bill question was later referred to a seven-judge bench. Surveillance reform remains incomplete: the Pegasus spyware allegations of 2021 led the Court to appoint a technical committee, invoking the proportionality principle from Puttaswamy. The informational-privacy dimension also frames ongoing litigation over the right to be forgotten and over Section 69 of the Information Technology Act, 2000, governing state interception.

For the working practitioner — the UPSC aspirant, the policy desk officer, or the litigator — Puttaswamy is foundational reading under General Studies Paper II on the polity and on the protection of fundamental rights. It supplies the analytical vocabulary, particularly the four-pronged proportionality inquiry, that now governs judicial review of state action affecting personal autonomy, bodily integrity, informational privacy, and decisional privacy. Any examination or briefing touching data protection, surveillance, reproductive rights, or digital governance in India proceeds from this judgment, making fluency in its reasoning indispensable for civil-service preparation and constitutional advocacy alike.