Constitutional Law Doctrines with Landmark Case Laws (2026)

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1. Basic Structure Doctrine

Relevant Article(s): Article 368

Meaning:
The Basic Structure Doctrine provides that although Parliament possesses wide powers to amend the Constitution under Article 368, it cannot alter, destroy or abrogate the essential features that constitute the identity of the Constitution. The doctrine limits the amending power of Parliament and preserves constitutional supremacy, democracy, judicial review and the rule of law. Therefore, every constitutional amendment is valid only if it does not damage or destroy the Basic Structure of the Constitution.

Landmark Case Laws:

• Kesavananda Bharati v. State of Kerala (1973)
• Minerva Mills Ltd. v. Union of India (1980)

2. Doctrine of Eclipse

Relevant Article(s): Article 13(1)

Meaning:
The Doctrine of Eclipse applies to pre-Constitution laws that become inconsistent with Fundamental Rights. Such laws are not completely void but remain dormant and unenforceable so long as the inconsistency exists. If the constitutional defect is removed, the law revives automatically. An eclipsed law is not dead; it merely remains temporarily inoperative until the eclipse is removed.

Landmark Case Laws:

• Bhikaji Narain Dhakras v. State of Madhya Pradesh (1955)

3. Doctrine of Severability

Relevant Article(s): Article 13

Meaning:
The Doctrine of Severability states that where a statute contains both valid and invalid provisions, only the unconstitutional portion is struck down if it can be separated from the valid part. The remaining provisions continue to operate independently and fulfil the legislative intent. The invalid portion is severed, while the valid portion survives.

Landmark Case Laws:

• R.M.D. Chamarbaugwala v. Union of India (1957)

4. Doctrine of Waiver

Relevant Article(s): Articles 14–32

Meaning:
The Doctrine of Waiver means the voluntary relinquishment of a legal right. However, it does not apply to Fundamental Rights because they are guaranteed not only for individual benefit but also in public interest. Therefore, no person can waive or surrender the Fundamental Rights guaranteed under Part III of the Constitution.

Landmark Case Laws:

• Basheshar Nath v. Commissioner of Income Tax (1959)

5. Doctrine of Colourable Legislation

Relevant Article(s): Article 246

Meaning:
The Doctrine of Colourable Legislation prevents a legislature from doing indirectly what it cannot do directly. Courts examine the true nature and substance of the law rather than its form to determine legislative competence. What cannot be done directly cannot be done indirectly.

Landmark Case Laws:

• K.C. Gajapati Narayan Deo v. State of Orissa (1953)

6. Doctrine of Pith and Substance

Relevant Article(s): Article 246 & Seventh Schedule

Meaning:
The Doctrine of Pith and Substance is applied when there is an overlap between Union and State legislative fields. Courts determine the true nature and dominant purpose of the legislation to decide legislative competence. Incidental encroachment does not invalidate a law if its true subject falls within the legislature's powers.

Landmark Case Laws:

• Prafulla Kumar Mukherjee v. Bank of Commerce (1947)
• State of Bombay v. F.N. Balsara (1951)

7. Doctrine of Repugnancy

Relevant Article(s): Article 254

Meaning:
The Doctrine of Repugnancy applies when a Central law and a State law on a Concurrent List subject are inconsistent. In such cases, the Central law prevails unless the State law has received Presidential assent under Article 254(2). Repugnancy exists only when both laws cannot operate together.

Landmark Case Laws:

• M. Karunanidhi v. Union of India (1979)

8. Doctrine of Prospective Overruling

Relevant Article(s): Article 141

Meaning:
The Doctrine of Prospective Overruling enables the Supreme Court to declare a new legal principle while applying it only to future cases. It protects past transactions and avoids unnecessary hardship. The law changes for the future without disturbing rights already settled.

Landmark Case Laws:

• I.C. Golaknath v. State of Punjab (1967)

9. Doctrine of Harmonious Construction

Relevant Article(s): —

Meaning:
The Doctrine of Harmonious Construction requires courts to interpret apparently conflicting constitutional or statutory provisions in a manner that gives effect to each of them. The objective is to harmonise provisions rather than render any provision redundant.

Landmark Case Laws:

• C.P. & Berar Act Case (1939)

10. Doctrine of Public Trust

Relevant Article(s): Article 21

Meaning:
The Doctrine of Public Trust recognises that natural resources such as forests, rivers and lakes are held by the State in trust for the public. The State is a trustee of natural resources and not their absolute owner.

Landmark Case Laws:

• M.C. Mehta v. Kamal Nath (1997)