What happened
The case began as an unlikely dispute. Swami Kesavananda Bharati, the head of a mutt in Kerala, went to the Supreme Court under Article 32 to challenge Kerala's land reform legislation, which restricted how much property the mutt could hold. That was Writ Petition No. 135 of 1970. But while the petition was pending, Parliament passed a series of constitutional amendments — the Twenty-fourth, Twenty-fifth and Twenty-ninth — designed to place land reform laws beyond the reach of the courts and to confirm Parliament's power to amend any part of the Constitution, including the fundamental rights. The case stopped being about a mutt's land and became about something much larger: whether there is any limit at all on the power to amend the Constitution. The Supreme Court assembled a bench of thirteen judges — the largest it has ever constituted — headed by Chief Justice S. M. Sikri, to hear the challenges to those three amendments together. The hearing ran for months. The judgment, delivered on 24 April 1973, runs to hundreds of pages and multiple separate opinions, and the judges did not all agree with each other.
What the court held
By a majority, the Court held that Parliament's power to amend the Constitution under Article 368 is very wide — wide enough to reach the fundamental rights themselves — but it is not unlimited. There are implicit limitations on that power. Parliament may amend the Constitution, but it may not use the amending power to damage or destroy the Constitution's basic structure or essential framework. An amendment that leaves the basic structure intact is valid; one that destroys it is not, no matter how correctly it was passed. The majority did not produce a closed list of what belongs to the basic structure, and that was deliberate: the content of the doctrine has been worked out case by case in the decades since, and has been held to include features such as the supremacy of the Constitution, the democratic and republican form of government, judicial review, and the separation of powers. The decision also displaced the Court's earlier ruling in Golak Nath, which had held that fundamental rights simply could not be amended at all. Kesavananda replaced that absolute bar with a more nuanced test: amendments to fundamental rights are permissible, provided they do not destroy the basic structure.
The law behind it
The provision at the centre of the case is Article 368 of the Constitution, which sets out how the Constitution may be amended and by what majorities. On its face, Article 368 places no subject matter beyond Parliament's reach. The question the Court had to answer was whether the word 'amend' carries an unwritten limit — whether a power to amend a constitution can include a power to abrogate it.
The petition itself was brought under Article 32, the right to move the Supreme Court directly for the enforcement of fundamental rights, which the Constitution's drafters called its heart and soul. The amendments under challenge were the Twenty-fourth (which asserted Parliament's power to amend any provision, including fundamental rights), the Twenty-fifth (concerning the right to property and compensation) and the Twenty-ninth (which placed certain Kerala land reform statutes in the Ninth Schedule, historically a device to shield laws from challenge).
The doctrine the case produced — the basic structure doctrine — is not written anywhere in the Constitution. It is a judicial reading of what Article 368 must implicitly mean. That is precisely why it remains debated, and why it is invoked in almost every serious constitutional challenge since.
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What it changed
The basic structure doctrine has been applied repeatedly since 1973, and it is now the settled framework for testing constitutional amendments. Its content has been filled in over time through later decisions rather than by any single list, and courts have treated features such as constitutional supremacy, the democratic and republican form of government, judicial review and the separation of powers as part of that structure. The doctrine has also travelled: courts in several other countries have looked to Kesavananda when confronting the same question about the limits of an amending power. It remains the most cited and most argued-over judgment in Indian constitutional law.
What this means for you
Kesavananda is not a case you will ever cite at a police station or a rent tribunal, and no ordinary dispute turns on it. Its importance to you is structural: it is the reason the rest of your rights are hard to take away. Because of this judgment, a government with a large enough majority in Parliament still cannot simply amend away judicial review, or the right to move the courts, or the democratic character of the Republic — because an amendment that destroyed those things would itself be open to challenge and could be struck down. Every time a constitutional amendment is challenged in the Supreme Court, the argument runs through the test this case created. In practical terms, it means the guarantees you rely on elsewhere on this site — the right to life and personal liberty, the right to approach a court when the state wrongs you — rest on something firmer than the goodwill of whoever holds a majority.
Source
Supreme Court of India, A 13-judge Constitution Bench headed by Chief Justice S. M. Sikri, 24 April 1973. Citation: AIR 1973 SC 1461; (1973) 4 SCC 225. Read the full judgment .
This explainer was written from the primary judgment text, not from news reports.