The Supreme Court has played a central role in shaping:
Indian Federalism + Centre–State Relations + Inter-State Relations
through decisions concerning:
These judgments establish an important principle:
Inter-State Relations Are Governed Not Only by Political Negotiation but Also by Constitutional Interpretation and Judicial Review
For UPSC, the most important cases can be grouped into:
Federalism
→ State of West Bengal
→ State of Rajasthan
→ S.R. Bommai
Article 356 / Governor
→ Rameshwar Prasad
→ Nabam Rebia
→ Subhash Desai
Inter-State Water
→ State of Karnataka v State of Tamil Nadu
→ Other River-Water Tribunal Cases
Inter-State Commerce
→ Automobile Transport
Fiscal Federalism
→ Mohit Minerals
1. State of West Bengal v. Union of India
Case: State of West Bengal v. Union of India
Year: 1962
Main Issue
The dispute concerned the:
Union's Power Over Property and State Rights
The case raised a broader question:
Are Indian States Completely Sovereign Entities?
Supreme Court Principle
The Court rejected the idea that States possess:
Absolute Sovereign Independence
outside the constitutional framework.
India's federal structure is based on:
Constitutional Distribution of Powers + Union Supremacy in Specified Areas
Importance
The judgment is important for understanding:
Nature of Indian federalism
Union supremacy
State powers
Constitutional distribution of authority
UPSC Memory
State of West Bengal
→ Union Supremacy
→ Nature of Indian Federalism
→ States Are Not Fully Sovereign
2. State of Rajasthan v. Union of India
Case: State of Rajasthan v. Union of India
Year: 1977
The case involved several States challenging Union action and raised important questions concerning:
Article 131
Centre–State relations
State autonomy
Union constitutional powers
The Supreme Court considered the:
Federal Distribution of Constitutional Authority
and the limits of judicial intervention in political questions.
Importance
The case is important for:
Union–State Constitutional Relations
and for understanding the tension between:
State Autonomy + Union Powers
UPSC Memory
Rajasthan Case
→ Centre-State Conflict
→ State Autonomy
→ Union Constitutional Powers
3. S.R. Bommai v. Union of India
Case: S.R. Bommai v. Union of India
Year: 1994
This is one of the most important judgments on:
Indian Federalism
and:
Article 356
Main Issue
The case concerned:
President's Rule + Dismissal of State Governments
Major Principles
The Supreme Court held that:
Federalism Is an Important Feature of the Constitution
and that:
Article 356 Is Subject to Judicial Review
The Union cannot use Article 356 as an:
Unrestricted Political Weapon
Floor Test Principle
Where majority is disputed, the appropriate method is generally:
Test of Legislative Majority on the Floor of the House
rather than relying merely on:
Governor's Subjective Assessment
Importance
The judgment strengthened:
Federalism
Judicial review
Democratic accountability
State autonomy
Constitutional limitations on Article 356
UPSC Memory
S.R. Bommai
→ Federalism
→ Article 356
→ Judicial Review
→ Floor Test
This remains one of the foundational judgments for Indian federalism.
4. Rameshwar Prasad v. Union of India
Case: Rameshwar Prasad v. Union of India
Year: 2006
Main Issue
The case involved:
Governor's report
Dissolution of Bihar Legislative Assembly
Article 356
Constitutional morality
Principle
The Supreme Court examined whether constitutional authorities could use:
Governor's Reports + Article 356 Powers
for purposes not justified by the Constitution.
The judgment reinforced:
Judicial Review of Constitutional Actions
Importance
It demonstrates that:
Governor's Report Is Not Beyond Judicial Scrutiny
UPSC Memory
Rameshwar Prasad
→ Governor's Report
→ Bihar Assembly
→ Article 356
→ Judicial Review
5. Nabam Rebia v. Deputy Speaker
Case: Nabam Rebia v. Deputy Speaker
Year: 2016
Main Issue
The case concerned:
Governor's Powers + Legislative Assembly
particularly the limits of:
Governor's Discretion
Principle
The Governor's powers are:
Constitutionally Limited
The Governor cannot treat discretionary authority as:
Unlimited Personal Power
Importance
The case is important for:
Governor's role
State legislature
Constitutional discretion
Federal balance
UPSC Memory
Nabam Rebia
→ Governor
→ Assembly
→ Limited Discretion
6. Subhash Desai v. Principal Secretary, Governor of Maharashtra
Case: Subhash Desai v. Principal Secretary, Governor of Maharashtra
Judgment: 2023
The case arose from the:
Maharashtra Constitutional and Political Crisis
and involved:
Governor's role
Government formation
Legislative majority
Speaker's role
Defection-related constitutional issues
Federal Importance
The judgment examined the interaction between:
Governor + Elected Government + Legislature
and reinforced the importance of:
Constitutional Procedure
Important Principle
The Governor's powers must remain connected to:
Objective Constitutional Circumstances
rather than:
Political Assumptions Alone
UPSC Memory
Subhash Desai
→ Maharashtra Crisis
→ Governor
→ Government Formation
→ Constitutional Procedure
The Supreme Court's official records identify the case as Subhash Desai v. Principal Secretary, Governor of Maharashtra.
7. Cauvery Water Dispute Judgment
Case: State of Karnataka v. State of Tamil Nadu & Others
Judgment: 2018
Main Issue
The case concerned:
Cauvery River Water Sharing
between:
Karnataka
Tamil Nadu
Kerala
Puducherry
Importance
The Supreme Court dealt with:
Inter-State river water
Tribunal award
Water sharing
Constitutional and statutory framework
The case is important for understanding:
Article 262 + Inter-State Water Dispute Mechanism + Supreme Court's Role
Later Developments
The Court has subsequently dealt with implementation-related matters concerning the Cauvery framework and associated projects. An official Supreme Court judgment in 2025 records the 2018 decision as the final determination of the principal water-sharing dispute and refers to the subsequent Cauvery Water Management Scheme.
UPSC Memory
Cauvery
→ River Water
→ Karnataka vs Tamil Nadu
→ 2018
→ Inter-State Water Sharing
8. Article 131 and State of West Bengal
The:
State of West Bengal v. Union of India
case is also important from the perspective of:
Article 131
because it was brought as an:
Original Suit
under the Supreme Court's original federal jurisdiction. The official judgment records that several States filed suits against the Union under Article 131.
This makes the case important for:
Article 131 + Federalism + Union–State Relations
9. State of Rajasthan and Article 131
The:
State of Rajasthan v. Union of India
litigation also involved:
Article 131
with multiple States bringing original suits against the Union. The case therefore illustrates how:
Article 131
can become a constitutional forum for:
Union–State Federal Disputes
The official Supreme Court record confirms the Article 131 original-suit framework.
10. Automobile Transport (Rajasthan) Ltd. v. State of Rajasthan
Case: Automobile Transport (Rajasthan) Ltd. v. State of Rajasthan
Year: 1962
Main Issue
The case concerned:
Article 301
and the constitutional freedom of:
Trade, Commerce and Intercourse
Importance
The Court examined the distinction between:
Regulatory Measures
and:
Restrictions on Trade and Commerce
Federal Significance
It is important for:
Inter-State Economic Integration
because State-level regulations can affect:
Movement of Goods + People + Commercial Activity
UPSC Memory
Automobile Transport
→ Article 301
→ Trade + Commerce
→ Regulatory Measures
11. Union of India v. Mohit Minerals Pvt. Ltd.
Case: Union of India v. Mohit Minerals Pvt. Ltd.
Year: 2022
Main Issue
The case concerned:
GST Council Recommendations
and their constitutional character.
Supreme Court Principle
The Supreme Court held that:
GST Council Recommendations Are Not Binding on Parliament and State Legislatures
This is important because the GST framework represents:
Cooperative Fiscal Federalism
while preserving:
Legislative Autonomy
Importance
The judgment is important for:
Article 279A
GST Council
Fiscal federalism
Union–State relations
Legislative autonomy
UPSC Memory
Mohit Minerals
→ GST Council
→ Recommendations
→ Not Binding
→ Cooperative Federalism
12. State of Karnataka v. State of Tamil Nadu and Others
The Cauvery litigation is particularly useful for understanding:
Water Federalism
The dispute illustrates the interaction among:
State Governments
Union Government
Water Tribunal
Supreme Court
Implementation mechanisms
It demonstrates that:
Inter-State Water Disputes Are Both Technical and Political
while requiring:
Legal + Institutional + Administrative Coordination
13. Inter-State River Water Cases — General Principle
The Supreme Court's water jurisprudence demonstrates that disputes involving:
River flows
Water allocation
Reservoirs
Irrigation
Environmental flows
require balancing:
Upstream + Downstream Interests
and:
Human Use + Ecological Sustainability
14. State of Haryana v. State of Punjab — SYL Canal
The:
Satluj-Yamuna Link Canal
dispute is another important example of:
Inter-State Water + Federal Relations
The dispute concerns:
Water sharing
Canal construction
Inter-State obligations
State compliance
UPSC Importance
It demonstrates:
Inter-State Agreement + Water Rights + Court Orders + State Compliance
15. State of Haryana v. State of Punjab — Federal Principle
The SYL litigation illustrates an important principle:
A State Cannot Unilaterally Defeat a Binding Inter-State Legal Framework Merely Because It Disagrees Politically
The case therefore connects:
Federalism + Rule of Law + Water Governance
16. State of Karnataka v. State of Andhra Pradesh
Inter-State water-related litigation involving:
Krishna River
has contributed to the jurisprudence concerning:
River waters
State rights
Tribunal awards
Inter-State legal disputes
The broader UPSC takeaway is:
River Basin Disputes Require Specialised Constitutional + Statutory Mechanisms
17. S.R. Bommai and Constitutional Federalism
For UPSC, S.R. Bommai should be connected to:
Centre–State Relations
rather than treated only as:
President's Rule
Its broader principle is:
States Are Constitutional Units With Significant Autonomy
while:
Union Powers Are Also Constitutionally Recognised
The balance is:
Federalism + Constitutional Supremacy
18. State of West Bengal and Indian Federalism
The case is particularly useful for understanding why India is often described as:
A Union With Federal Features
rather than:
A Compact of Fully Sovereign States
The Constitution provides:
Federal distribution of powers
State Governments
Independent constitutional existence
but also gives the Union:
Important Supremacy and Integrating Powers
19. State of Rajasthan and Political Federalism
The case demonstrates that:
Federal Relations Can Become Politically Contested
The Court's role is to examine:
Constitutional Legality
rather than:
Political Popularity
20. Governor Cases and Inter-State Relations
The following cases should be studied together:
Nabam Rebia
↓
Governor's Discretion
Rameshwar Prasad
↓
Governor's Report + Article 356
S.R. Bommai
↓
Judicial Review + Federalism
Subhash Desai
↓
Governor + Government Formation
Together they demonstrate:
Governor's Powers Are Constitutional, Not Unlimited
21. Article 131 Cases
Important cases connected with:
Article 131
include:
State of West Bengal v. Union of India
State of Rajasthan v. Union of India
State-level federal disputes concerning legal rights
The central principle is:
Article 131 Is Original Jurisdiction, Not Appellate Jurisdiction
22. Article 131 vs Article 262
This distinction is essential.
Article 131
General Federal Legal Disputes
Article 262
Inter-State River Water Disputes
Therefore:
131
→ Legal Right
262
→ River Water
23. Article 136 and Inter-State Matters
Article 136 provides:
Special Leave to Appeal
from:
Courts
Tribunals
It may become relevant to inter-State matters where:
Environmental tribunals
Regulatory tribunals
High Courts
Other competent forums
have issued decisions.
However:
Article 136 Is Discretionary
and special statutory schemes may affect its availability.
24. Article 301 and Inter-State Commerce
The:
Automobile Transport
case is important for understanding:
Freedom of Trade + Regulation
Other Article 301 jurisprudence demonstrates that:
State Regulation Cannot Be Treated as Automatically Invalid
The Court examines:
Nature + Effect + Constitutional Framework
25. GST and Inter-State Relations
The:
Mohit Minerals
judgment illustrates the modern evolution of:
Fiscal Federalism
The GST framework requires:
Union + States
to coordinate while preserving:
Constitutional Legislative Authority
26. Environmental Federalism
The Supreme Court's broader environmental jurisprudence supports principles such as:
Sustainable development
Precautionary principle
Polluter pays
Public trust doctrine
These principles become especially important where:
Environmental Effects Cross State Boundaries
27. Judicial Role in Inter-State Relations
The Supreme Court performs several roles:
Constitutional Arbiter
→ Federal legal disputes
Judicial Reviewer
→ Union + State constitutional action
Federal Balance Protector
→ State autonomy + Union powers
Final Appellate Court
→ Decisions of courts and tribunals where constitutional/statutory routes permit
Rights Interpreter
→ Legal rights and constitutional obligations
28. Political vs Judicial Mechanisms
The federal system uses:
Political
→ Chief Ministers
Consultative
→ Inter-State Council
Regional
→ Zonal Councils
Fiscal
→ Finance Commission / GST Council
Specialised
→ Tribunals
Judicial
→ Supreme Court
This demonstrates:
Multi-Level Federal Dispute Resolution
29. Major Supreme Court Judgments — Quick Table
Judgment Year Core Inter-State / Federal Theme UPSC Keyword
State of West Bengal v. Union of India 1962 Nature of Indian federalism, Union–State powers Union Supremacy
Automobile Transport (Rajasthan) v. State of Rajasthan 1962 Article 301 Trade & Commerce
State of Rajasthan v. Union of India 1977 Centre–State constitutional conflict Federal Powers
S.R. Bommai v. Union of India 1994 Article 356, federalism, judicial review Floor Test
Rameshwar Prasad v. Union of India 2006 Governor's report, Article 356 Constitutional Review
Nabam Rebia v. Deputy Speaker 2016 Governor's discretion Limited Discretion
State of Karnataka v. State of Tamil Nadu 2018 Cauvery water dispute Water Sharing
Union of India v. Mohit Minerals 2022 GST Council Cooperative Fiscal Federalism
Subhash Desai v. Principal Secretary, Governor of Maharashtra 2023 Governor, government formation, legislative process Constitutional Procedure
30. Supreme Court Judgments — Theme-Wise Revision
Federalism
State of West Bengal
→ Union–State Structure
State of Rajasthan
→ Centre–State Conflict
S.R. Bommai
→ Federalism + Article 356
Governor
Rameshwar Prasad
→ Governor's Report
Nabam Rebia
→ Governor's Discretion
Subhash Desai
→ Government Formation
Water
Cauvery
→ Inter-State Water Sharing
SYL
→ Water + State Compliance
Economic Federalism
Automobile Transport
→ Article 301
Mohit Minerals
→ GST + Fiscal Federalism
31. Most Important Cases for UPSC
If limited time is available, prioritise:
Tier 1 — Must Know
S.R. Bommai
State of West Bengal
State of Rajasthan
Rameshwar Prasad
Nabam Rebia
Mohit Minerals
Cauvery Judgment
Tier 2 — Important
Automobile Transport
Subhash Desai
SYL Canal Litigation
32. UPSC Prelims Facts
Important Facts
Article 131 provides the Supreme Court's original jurisdiction in specified federal disputes.
Article 262 concerns inter-State river water disputes.
Article 263 provides for the Inter-State Council.
S.R. Bommai is a landmark federalism and Article 356 judgment.
Rameshwar Prasad concerns the constitutional limits on dissolution of a State Assembly and use of Article 356.
Nabam Rebia concerns the limits of Governor's discretion.
Subhash Desai concerns constitutional processes involving the Governor and Maharashtra political crisis.
State of West Bengal v. Union of India is important for understanding the nature of Indian federalism and Union–State relations.
State of Rajasthan v. Union of India is an important Article 131 / Centre–State federal dispute case.
Automobile Transport (Rajasthan) concerns Article 301 and inter-State trade and commerce.
Mohit Minerals concerns the constitutional status of GST Council recommendations.
Inter-State water disputes operate under a special framework involving Article 262 and legislation enacted by Parliament.
Judicial review is an important safeguard against arbitrary use of constitutional powers.
The Supreme Court's role includes interpreting both Union powers and State constitutional rights.
33. UPSC Prelims Traps
Trap 1
"S.R. Bommai is only about President's Rule."
False
It is also a:
Landmark Federalism Judgment
Trap 2
"Article 131 is appellate jurisdiction."
False
It is:
Original Jurisdiction
Trap 3
"Article 262 means every river dispute goes directly to the Supreme Court."
False
It provides a:
Special Constitutional Framework
for inter-State river-water disputes.
Trap 4
"Inter-State Council is a judicial tribunal."
False
It is:
Consultative + Coordinating
Trap 5
"GST Council recommendations are automatically binding on Parliament and State Legislatures."
False
The Supreme Court held in:
Mohit Minerals
that they are:
Not Binding
Trap 6
"Governor has unrestricted discretion."
False
The Governor is subject to:
Constitutional Limits + Judicial Review
Trap 7
"State of West Bengal established complete State sovereignty."
False
The case is important precisely because it rejected:
Complete State Sovereignty Separate From the Union
Trap 8
"Article 301 prohibits all State regulation affecting trade."
False
The Court distinguishes:
Legitimate Regulation
from:
Unconstitutional Restrictions
34. Easy Memory Tricks
Seven Must-Know Cases
West Bengal
→ Federal Structure
Rajasthan
→ Centre-State Conflict
Bommai
→ Article 356
Rameshwar
→ Governor's Report
Nabam Rebia
→ Governor Discretion
Cauvery
→ Water Sharing
Mohit Minerals
→ GST
35. One-Line Case Memory
West Bengal
→ States Are Not Sovereign States
Rajasthan
→ Federal Constitutional Conflict
Bommai
→ Federalism + Floor Test
Rameshwar
→ Governor's Report Review
Nabam Rebia
→ Governor's Discretion Limited
Cauvery
→ Inter-State Water Sharing
Mohit Minerals
→ GST Council Recommendations Not Binding
Quick Revision
36. One-Page Revision
SUPREME COURT JUDGMENTS
ON INTER-STATE RELATIONS
↓
FEDERALISM
→ State of West Bengal
→ State of Rajasthan
→ S.R. Bommai
↓
GOVERNOR
→ Rameshwar Prasad
→ Nabam Rebia
→ Subhash Desai
↓
WATER
→ Cauvery
→ SYL Canal
→ Article 262 Framework
↓
TRADE
→ Automobile Transport
→ Article 301
↓
FISCAL FEDERALISM
→ Mohit Minerals
→ GST Council
↓
ARTICLE 131
→ Original Federal Jurisdiction
↓
ARTICLE 136
→ Special Leave
↓
KEY PRINCIPLES
→ Federalism
→ Judicial Review
→ Constitutional Supremacy
→ State Autonomy
→ Union Integration
→ Rule of Law
↓
OBJECTIVE
→ RULE-BASED COOPERATIVE FEDERALISM
Mains Perspective
37. Constitutional Significance
The Supreme Court has developed inter-State jurisprudence that balances:
Union Integration
with:
State Constitutional Autonomy
The Court's approach demonstrates that:
Indian Federalism Is Neither Purely Centralised Nor Purely State-Sovereign
38. Federal Significance
The judgments establish:
Federalism + Constitutional Supremacy + Judicial Review
as central features of inter-State relations.
39. Political Significance
Inter-State disputes frequently involve:
Water
Regional identity
Political mobilisation
Resource allocation
Judicial decisions provide:
Rule-Based Resolution
where political negotiations fail.
40. Economic Significance
Cases involving:
Article 301
GST
Energy
Infrastructure
show that:
Federalism Also Shapes India's Common Economic Space
41. Environmental Significance
Water and environmental jurisprudence increasingly requires balancing:
Development + Resource Sharing + Ecological Sustainability
42. Governance Significance
The best federal system combines:
Negotiation
Consultation
Specialised Adjudication
Judicial Review
Thus:
Courts Should Be a Federal Backstop, Not the Only Federal Institution
43. Way Forward
India should strengthen:
Pre-Litigation Negotiation
Inter-State Council
Zonal Councils
Specialised Technical Institutions
Common Data Systems
Tribunal Capacity
Judicial Efficiency
Implementation of Judgments
The objective should be:
Resolve Inter-State Conflicts Early, Constitutionally and Cooperatively
44. Conclusion
Supreme Court judgments have played a foundational role in shaping:
Indian Inter-State Relations
The most important jurisprudential themes are:
State of West Bengal → Nature of Indian Federalism
State of Rajasthan → Centre–State Constitutional Conflict
S.R. Bommai → Federalism + Article 356 + Judicial Review
Rameshwar Prasad → Governor + Article 356
Nabam Rebia → Governor's Limited Discretion
Subhash Desai → Constitutional Government Formation
Cauvery → Inter-State Water Sharing
Automobile Transport → Article 301
Mohit Minerals → GST + Cooperative Fiscal Federalism
The most important UPSC memory line is:
Inter-State Jurisprudence = Federalism + Article 131 + Water Disputes + Article 356 + Governor + Trade + GST + Judicial Review
The broader principle is:
The Supreme Court's Inter-State Jurisprudence Ensures That Political and Administrative Conflicts Between Governments Remain Subject to Constitutional Law, Federal Balance and the Rule of Law