Constitutional law

In short

Constitutional law is the study of the Constitution of India — the supreme law that creates the organs of the State, distributes powers between the Union and the States, guarantees enforceable rights against the State, and sets the limits beyond which no law or government action is valid. It matters because every other statute, rule and executive order derives validity from it, and any law that violates it is void under Article 13. It is examined in every LLB programme, in CLAT-PG, AIBE, judicial services, UGC-NET Law and university semester papers, and tested in interviews at law firms, corporate legal teams, PSU legal cells and policy organisations. In practice it underpins writ petitions, regulatory challenges, data-privacy compliance, reservation and service matters, and advisory work on Centre-State subjects such as GST and land.

Explained

Nature, sources and the Preamble

• Constitution of India: adopted 26 November 1949, came into force 26 January 1950; the longest written national constitution, with 25 Parts, 12 Schedules and over 440 Articles after amendments. It is partly rigid, partly flexible.
• Sources: Government of India Act 1935 (administrative scheme, federal structure, emergency), UK (parliamentary government, rule of law, single citizenship), USA (fundamental rights, judicial review, written constitution), Ireland (directive principles), Canada (federation with a strong Centre, residuary power with the Union), Germany/Weimar (suspension of rights in emergency), USSR (fundamental duties), Australia (concurrent list, trade and commerce), South Africa (amendment procedure, Rajya Sabha elections), Japan (procedure established by law).
• Preamble: declares India a Sovereign, Socialist, Secular, Democratic Republic securing Justice, Liberty, Equality and Fraternity; "Socialist", "Secular" and "integrity" were inserted by the 42nd Amendment, 1976.
• The Preamble is part of the Constitution (*Kesavananda Bharati*, 1973, overruling *Berubari Union*, 1960), is not independently enforceable, but aids interpretation and is amendable without destroying basic features (*S.R. Bommai*; *Minerva Mills*).
• Doctrine of constitutional supremacy: Parliament is not sovereign in the British sense; it is supreme only within the limits the Constitution draws.

Fundamental Rights (Part III, Articles 12-35)

• Article 12 — "State": Government and Parliament of India, Government and Legislature of each State, all local authorities and "other authorities". The functional test for "other authorities" is deep and pervasive State control (*Ajay Hasia*; *Pradeep Kumar Biswas*, 2002, seven-judge bench). Judiciary acting judicially is generally outside Article 12.
• Article 13: pre-Constitution laws inconsistent with Part III are void to the extent of inconsistency; post-Constitution laws violating Part III are void. Article 13(4) and Article 368(3) exclude constitutional amendments from "law" — but basic-structure review survives.
  • Doctrine of eclipse: a pre-Constitution law inconsistent with Part III is not dead but dormant; it revives if the restriction is removed (*Bhikaji Narain Dhakras v. State of MP*).
  • Doctrine of severability: only the offending portion is struck down if separable (*R.M.D. Chamarbaugwalla*).
  • Doctrine of waiver: fundamental rights cannot be waived (*Basheshar Nath*).
• Right to equality (14-18):
  • Article 14 — equality before law and equal protection of laws. Tests: (a) reasonable classification — intelligible differentia plus rational nexus with the object (*State of West Bengal v. Anwar Ali Sarkar*); (b) arbitrariness — any arbitrary State action is per se unequal (*E.P. Royappa*; *Maneka Gandhi*; *Shayara Bano*, 2017, striking down instant triple talaq). "Class legislation" is bad; classification is good.
  • Article 15 — no discrimination on religion, race, caste, sex, place of birth; 15(3) special provision for women and children; 15(4) and 15(5) reservation for SC/ST/OBC in admissions; 15(6) EWS reservation (103rd Amendment, 2019, upheld in *Janhit Abhiyan*, 2022).
  • Article 16 — equality of opportunity in public employment; 16(4) reservation in appointments; 16(4A) reservation in promotion with consequential seniority for SC/ST; 16(6) EWS. *Indra Sawhney* (1992): 50% ceiling, exclusion of the creamy layer, no reservation in promotions (later altered by amendment); *M. Nagaraj* and *Jarnail Singh* (2018) on promotion quotas.
  • Article 17 abolishes untouchability (enforced by the Protection of Civil Rights Act, 1955 and the SC/ST (Prevention of Atrocities) Act, 1989); Article 18 abolishes titles.
• Right to freedom (19-22):
  • Article 19(1) — six freedoms: speech and expression, assembly, association, movement, residence, profession/trade. Each has its own restriction clause, 19(2)-(6), requiring restrictions to be reasonable and imposed by law on the stated grounds only.
  • Article 19(2) grounds: sovereignty and integrity, security of the State, friendly relations with foreign States, public order, decency or morality, contempt of court, defamation, incitement to an offence. *Shreya Singhal* (2015) struck down Section 66A of the IT Act for vagueness and overbreadth; *Romesh Thappar* and *Brij Bhushan* established that "public order" was not then a ground (added by the 1st Amendment).
  • Article 20 — no ex post facto criminal law, no double jeopardy, no self-incrimination (*Selvi v. State of Karnataka* on narco-analysis).
  • Article 21 — "No person shall be deprived of his life or personal liberty except according to procedure established by law." Read narrowly in *A.K. Gopalan*, expansively in *Maneka Gandhi* (1978): procedure must be just, fair and reasonable, and Articles 14, 19 and 21 are read together. Derived rights: livelihood (*Olga Tellis*), speedy trial (*Hussainara Khatoon*), legal aid, clean environment (*Subhash Kumar*), privacy (*K.S. Puttaswamy*, 2017, nine judges), dignity and decriminalisation of consensual same-sex relations (*Navtej Singh Johar*, 2018), death with dignity and passive euthanasia (*Common Cause*, 2018).
  • Article 21A — free and compulsory education for ages 6-14 (86th Amendment, 2002; Right to Education Act, 2009).
  • Article 22 — protection against arrest and detention: grounds of arrest, counsel, production before a magistrate within 24 hours; preventive detention safeguards (advisory board, three-month limit).
• Right against exploitation (23-24): ban on traffic in human beings and forced labour (*People's Union for Democratic Rights* — payment below minimum wage is forced labour); ban on employment of children below 14 in factories, mines and hazardous work.
• Freedom of religion (25-28): freedom of conscience and practice, subject to public order, morality, health; essential religious practices test (*Shirur Mutt*); State power to regulate secular aspects and throw temples open (Article 25(2)(b)); *Sabarimala* (2018) on exclusion of women; right of institutions to manage their own affairs (26).
• Cultural and educational rights (29-30): protection of language, script, culture; minorities' right to establish and administer educational institutions (*T.M.A. Pai Foundation*, 2002; *St. Stephen's*).
• Constitutional remedies (32): Dr Ambedkar called Article 32 "the very soul of the Constitution". The right to move the Supreme Court for enforcement of fundamental rights is itself a fundamental right and cannot be suspended except under Article 359 in a national emergency.

DPSPs, Fundamental Duties and their interplay with rights

• Directive Principles (Part IV, Articles 36-51) are non-justiciable (Article 37) but "fundamental in the governance of the country" — guidelines for legislation and policy.
  • Socialistic: 38, 39 (distribution of material resources, equal pay for equal work), 39A legal aid, 41, 42, 43, 43A worker participation, 47 nutrition and prohibition.
  • Gandhian: 40 village panchayats, 43 cottage industries, 46 SC/ST/weaker sections, 47, 48 cattle.
  • Liberal-intellectual: 44 uniform civil code, 45 early childhood care, 48 agriculture, 48A environment and forests, 49 monuments, 50 separation of judiciary from executive, 51 international peace.
• Conflict: *Champakam Dorairajan* (1951) gave Part III primacy; *Kerala Education Bill* laid down harmonious construction; *Minerva Mills* (1980) struck down Article 31C's blanket immunity, holding the balance between Parts III and IV is itself a basic feature. Article 31C protects laws giving effect to Articles 39(b) and 39(c) from Articles 14 and 19.
• Fundamental Duties (Part IVA, Article 51A): eleven duties, inserted by the 42nd Amendment on the Swaran Singh Committee recommendation; the eleventh (parent's duty to provide education) added by the 86th Amendment. Non-enforceable in themselves, but courts use them to interpret statutes (*AIIMS Students' Union*).

Union, States and federalism

• Nature: a "Union of States" (Article 1) — federal in structure, unitary in spirit; described as quasi-federal (Wheare) or federal with a strong centralising bias (*S.R. Bommai*; *State of West Bengal v. Union of India*).
• Legislative distribution (Article 246, Seventh Schedule): Union List (List I, defence, foreign affairs, banking, railways), State List (List II, police, public health, land, local government, State excise), Concurrent List (List III, criminal law, contracts, education, forests, labour). Union law prevails on repugnancy (Article 254), subject to Presidential assent for State laws under 254(2). Residuary power is with Parliament (Article 248 and Entry 97).
  • Doctrine of pith and substance: validity is judged by the true nature of the legislation, ignoring incidental encroachment (*Prafulla Kumar Mukherjee v. Bank of Commerce*).
  • Colourable legislation: what cannot be done directly cannot be done indirectly (*K.C. Gajapati Narayan Deo*).
  • Harmonious construction; doctrine of occupied field; territorial nexus (*State of Bombay v. RMDC*).
• Parliament may legislate on State subjects under Articles 249 (Rajya Sabha resolution), 250 (emergency), 252 (two or more States request), 253 (international agreements) and 356.
• Fiscal federalism: Finance Commission (Article 280) every five years; GST Council (Article 279A, 101st Amendment, 2016) — GST now has 5%, 18% and 40% slabs following the 22 September 2025 rate restructuring.
• Administrative relations: Articles 256-263, All-India Services, Inter-State Council (263), inter-State water disputes (262), freedom of trade and commerce (301-307).
• Asymmetric federalism: Fifth and Sixth Schedules (tribal areas), Articles 371-371J special provisions. Article 370 was rendered inoperative by the Constitution Order of 5 August 2019 and the J&K Reorganisation Act, 2019; upheld in *In Re: Article 370* (December 2023).

Organs of government, judicial review and emergency

• Executive: President (52-78) elected indirectly by an electoral college with a single transferable vote; acts on the aid and advice of the Council of Ministers, which is binding after the 42nd and 44th Amendments (Article 74(1)); may require reconsideration once. Governor (153-167) has a limited discretionary sphere; discretion is reviewable (*Nabam Rebia*, 2016, on assembly sessions and the Speaker). Pardoning power: Article 72 (President) and 161 (Governor).
• Legislature: Lok Sabha (max 550 elected) and Rajya Sabha (max 250, of whom 238 represent the States and Union territories — State members elected by the State legislative assemblies by proportional representation with the single transferable vote — and 12 are nominated by the President); Money Bill (Article 110) is defined and certified by the Speaker; anti-defection under the Tenth Schedule (Speaker as tribunal; decision subject to judicial review — *Kihoto Hollohan*). Parliamentary privileges, Articles 105 and 194 (*Sita Soren*, 2024, overruled *P.V. Narasimha Rao* — no immunity for bribery in a vote).
• Judiciary: Supreme Court (124-147) and High Courts (214-231). Original (131), writ (32), appellate (132-134, 136 special leave), advisory (143), review (137) jurisdictions; Article 141 makes its law binding on all courts; Article 142 allows orders for "complete justice". Judicial appointments run through the collegium after the *Three Judges Cases*; the 99th Amendment and the NJAC Act were struck down in 2015.
• Five writs (Articles 32 and 226):
  • Habeas corpus — produce a detained person; lies against the State and private persons.
  • Mandamus — command a public authority to perform a public duty; not against the President, Governor, or for a purely contractual or discretionary act.
  • Prohibition — stops a judicial/quasi-judicial body from exceeding jurisdiction (issued during proceedings).
  • Certiorari — quashes an order already passed without jurisdiction or with an error of law apparent on the record.
  • Quo warranto — questions the holding of a public office; any person may apply.
  • Article 226 is wider than Article 32: it covers fundamental rights *and* other legal rights, and the High Court's power cannot be excluded.
• Public Interest Litigation: relaxed *locus standi* (*S.P. Gupta*; *Hussainara Khatoon*), epistolary jurisdiction, continuing mandamus (*Vineet Narain*); criticised for judicial overreach and misuse.
• Basic structure doctrine: *Shankari Prasad* and *Sajjan Singh* allowed amendment of fundamental rights; *Golaknath* (1967) held they could not be abridged; Kesavananda Bharati (1973) held Parliament may amend any provision but cannot destroy the Constitution's basic structure. Applied in *Indira Nehru Gandhi v. Raj Narain* (free elections), *Minerva Mills* (judicial review, balance of Parts III and IV), *Waman Rao*, *S.R. Bommai* (secularism, federalism), *I.R. Coelho* (2007, Ninth Schedule laws after 24 April 1973 are open to review), *NJAC* (judicial independence).
• Amendment (Article 368): (i) simple majority for matters such as new States and citizenship (outside 368); (ii) special majority — two-thirds of members present and voting plus a majority of total membership; (iii) special majority plus ratification by at least half the State legislatures for federal provisions (election of the President, distribution of legislative powers, Supreme Court and High Courts, representation of States, Article 368 itself).
• Emergency: National emergency (352) — war, external aggression or armed rebellion (substituted for "internal disturbance" by the 44th Amendment, 1978); needs written Cabinet advice; parliamentary approval by special majority within one month; six-month renewals; Article 19 rights suspendable only in a war/aggression emergency; Articles 20 and 21 can never be suspended (44th Amendment, after *ADM Jabalpur*, 1976, which is now discredited and expressly overruled in *Puttaswamy*).
• President's rule (356) — failure of constitutional machinery; two-month parliamentary approval, outer limit three years; *S.R. Bommai* (1994) made the proclamation justiciable and required a floor test. Financial emergency (360) has never been used.

Key points

• Constitutional supremacy - every law and executive act must trace validity to the Constitution; inconsistent law is void under Article 13.
• Preamble - Sovereign, Socialist, Secular, Democratic Republic; part of the Constitution, not independently enforceable.
• Article 12 "State" - includes instrumentalities under deep and pervasive government control; fixes who fundamental rights run against.
• Article 14 - twin tests: reasonable classification (differentia + nexus) and non-arbitrariness.
• Article 19 - six freedoms, each restrictable only by law, only on the enumerated grounds, and only reasonably.
• Article 21 - the expanding right; after *Maneka Gandhi*, procedure must be just, fair and reasonable, not merely enacted.
• Puttaswamy (2017) - privacy is a fundamental right under Article 21; the four-fold test is legality, legitimate aim, proportionality and procedural safeguards.
• DPSPs - non-justiciable (Article 37) but binding in spirit; harmonised with Part III, and the balance between them is a basic feature.
• Fundamental Duties - Article 51A, eleven duties, interpretive value only.
• Basic structure - *Kesavananda Bharati*: amendment yes, destruction no; the single most important Indian constitutional doctrine.
• Article 368 - three amendment routes; federal provisions need ratification by half the States.
• Seventh Schedule - three lists; Union prevails on repugnancy; residuary power with Parliament.
• Pith and substance - incidental trespass into another list does not invalidate a law.
• Five writs - habeas corpus, mandamus, prohibition, certiorari, quo warranto; Article 226 is wider than Article 32.
• Articles 20 and 21 - never suspendable, even in a national emergency (44th Amendment).
• Article 356 - justiciable after *S.R. Bommai*; the floor of the House, not the Governor's report, decides majority.
• Judicial review - implicit in Articles 13, 32, 226, 131, 136 and 246; itself part of the basic structure.
• Separation of powers - functional, not rigid, in India; checks and balances rather than watertight compartments.

Formulas and examples

Constitutional law has no numerical formulas; its "formulas" are the standard judicial tests that must be reproduced accurately in answers.

Worked example 1 — Article 368 arithmetic. The Lok Sabha has 543 elected members. A constitutional amendment Bill is taken up; 500 members are present and voting, of whom 340 vote in favour.

• Majority of total membership = more than 543/2 = at least 272. 340 > 272 ✓
• Two-thirds of members present and voting = (2/3) × 500 = 333.33, so at least 334 votes needed. 340 ≥ 334 ✓
• Result: the Bill is passed in the Lok Sabha. If only 330 had voted in favour, it would fail the two-thirds test even though it crosses 272.

Worked example 2 — ratification by States. The same Bill alters Entry 52 of the Union List, i.e. the distribution of legislative powers, so Article 368(2) proviso applies. With 28 States, ratification is needed from not less than one-half = 14 State legislatures by simple majority. Union territories with legislatures (Delhi, Puducherry, J&K) are not counted for this purpose. If 13 States ratify, the amendment does not come into force.

Worked example 3 — applying Article 14. A State rule fixes the retirement age at 60 for clerks recruited before 2010 and 58 for those recruited after.

• Step 1 — is there a classification? Yes: date of recruitment.
• Step 2 — intelligible differentia? Yes, the date is a clear, ascertainable criterion.
• Step 3 — rational nexus with the object? If the object is uniform cadre efficiency, a mere cut-off date has no nexus; identically placed clerks doing identical work are treated unequally.
• Step 4 — conclusion: likely violative of Article 14 as arbitrary classification; the remedy is a writ under Article 226 seeking to read down the cut-off.

Worked example 4 — choosing the right writ. A Municipal Commissioner refuses to decide a statutorily mandated trade licence application; separately, a Rent Tribunal with jurisdiction only up to ₹50,000 monthly rent has passed an order in a dispute over ₹2,00,000 rent; and a person without the prescribed degree has been appointed Public Prosecutor.

• Licence: a public duty not performed → mandamus.
• Tribunal order already passed without jurisdiction → certiorari (if proceedings were still pending, prohibition).
• Unqualified holder of a public office → quo warranto.
• All three can be combined in a single Article 226 petition before the High Court.

Where it is used

• Litigation and chambers practice: drafting writ petitions and special leave petitions in High Courts and the Supreme Court; constitutional challenges to statutes, rules, tenders and service conditions.
• Regulatory and corporate advisory: Article 19(1)(g) and 301 arguments against trade restrictions; challenges to orders of SEBI, TRAI, CCI, RBI and State excise authorities; data-protection compliance under the Digital Personal Data Protection Act, 2023, which rests on *Puttaswamy*.
• Government and PSU legal cells: Union and State law departments, Advocate General and Attorney General offices, drafting legislation for legislative competence under the Seventh Schedule, and Centre-State matters such as GST Council decisions and land acquisition.
• Employment and service law: reservation, promotion, seniority and disciplinary matters before CAT, SATs and High Courts, argued on Articles 14, 16 and 311.
• Policy, NGOs and think tanks: PIL and research work at organisations working on prisons, environment (Article 48A with Article 21), education (Article 21A and the RTE Act) and free speech.
• Recruitment and exams: judicial services, AIBE, CLAT-PG, UGC-NET Law, UPSC/State PSC law papers, and the constitutional-law rounds in law-firm and in-house interviews.

Interview questions

• Q: What is the basic structure doctrine and which case established it? A: *Kesavananda Bharati v. State of Kerala* (1973) held that Parliament can amend any part of the Constitution under Article 368 but cannot alter or destroy its basic structure — features such as supremacy of the Constitution, republican and democratic government, secularism, separation of powers, federalism and judicial review.
• Q: Is the Preamble part of the Constitution, and can it be amended? A: Yes — *Kesavananda Bharati* held it is part of the Constitution, overruling *Berubari Union*; it has been amended once, by the 42nd Amendment in 1976, and can be amended so long as basic features are not destroyed.
• Q: How is Article 226 wider than Article 32? A: Article 226 can be invoked for the enforcement of fundamental rights and of any other legal right, and the High Court has discretion over remedies; Article 32 is confined to fundamental rights, but is itself a fundamental right the Supreme Court cannot decline.
• Q: What changed after *Maneka Gandhi*? A: "Procedure established by law" in Article 21 was held to mean a just, fair and reasonable procedure, and Articles 14, 19 and 21 were read as a connected whole rather than as mutually exclusive rights, which opened the door to due-process review.
• Q: Which fundamental rights survive a national emergency? A: Article 19 rights can be suspended only in an emergency declared on grounds of war or external aggression; Articles 20 and 21 can never be suspended, a safeguard added by the 44th Amendment, 1978.
• Q: Explain the doctrine of pith and substance with an example. A: A law is tested by its true nature and substance, so incidental encroachment on another list does not invalidate it — in *Prafulla Kumar Mukherjee*, a Bengal money-lending law touching promissory notes (a Union subject) was upheld as being in pith and substance about money-lending, a State subject.
• Q: What is the difference between prohibition and certiorari? A: Both control jurisdictional excess by judicial or quasi-judicial bodies; prohibition is preventive and issues while proceedings are pending, while certiorari is corrective and quashes an order already made.
• Q: Can a fundamental right be waived? A: No — *Basheshar Nath v. CIT* held that fundamental rights are conferred as a matter of public policy and cannot be waived by agreement or conduct, unlike ordinary contractual rights.
• Q: Is the President bound by ministerial advice? A: Yes — Article 74(1), as amended by the 42nd and 44th Amendments, makes the advice of the Council of Ministers binding, although the President may require reconsideration once, after which the advice must be accepted.
• Q: What is the proportionality test and where is it applied? A: Derived from *Modern Dental College* and *Puttaswamy*, it asks whether the measure pursues a legitimate aim, is rationally connected to it, is the least restrictive means, and strikes a fair balance — it is now the standard for rights limitations, including privacy and data protection.
• Q: How did *S.R. Bommai* change Article 356? A: It held that a proclamation is subject to judicial review, that the material must be relevant, that a majority must be tested on the floor of the House rather than through the Governor's subjective assessment, and that secularism is a basic feature.
• Q: Does the doctrine of eclipse apply to post-Constitution laws? A: The classical view is that it applies to pre-Constitution laws, which are only eclipsed and revive when the constitutional bar is removed; post-Constitution laws violating Part III are void from inception, though courts have applied eclipse to such laws where the right invoked, such as Article 19, is available only to citizens.

Common mistakes

• Treating Article 14 as requiring identical treatment of everyone — it forbids class legislation but permits reasonable classification, and additionally bars arbitrariness.
• Saying all fundamental rights are suspended in an emergency; Articles 20 and 21 are never suspendable, and Article 19 only in a war or external-aggression emergency.
• Confusing Article 32 with Article 226, or claiming Article 226 is limited to fundamental rights.
• Mixing up prohibition with certiorari, and seeking mandamus against the President, Governor, or for a discretionary or purely contractual act.
• Asserting that DPSPs are enforceable in court, or conversely that they have no legal value at all — they guide legislation, justify reasonable restrictions and inform interpretation.
• Writing that Parliament cannot amend fundamental rights (*Golaknath*) as the current law — *Kesavananda Bharati* permits amendment subject to the basic structure.
• Quoting case names without the proposition, or quoting a bare Article number without stating the test; examiners award marks for the test and its application, not for citation alone.
• Forgetting the State-ratification proviso to Article 368(2) for federal provisions, and miscomputing the special majority by using only two-thirds of those present.

Related topics

• Jurisprudence · Administrative law · Human rights law · Federalism and Centre-State relations · Judicial process and interpretation of statutes · Criminal procedure and personal liberty