A Constitutional Amendment Bill under Article 368 that proposed three structural changes to India's parliamentary representation, introduced as part of a three-Bill package on 16 April 2026.
| Bill | Type | Primary Purpose | Introduced by |
|---|---|---|---|
| Constitution (131st Amendment) Bill, 2026 | CAB | Amend Art. 81, 82, 334A — expand LS to 850; delink women's reservation from post-2026 Census | Law Min. Arjun Ram Meghwal |
| Delimitation Bill, 2026 | Ordinary | Delimitation Commission framework; 2011 Census basis; repeal Delimitation Act 2002 | Law Min. Arjun Ram Meghwal |
| Union Territories Laws (Amendment) Bill, 2026 | Ordinary | Extend delimitation to Delhi, Puducherry, J&K assemblies | Home Min. Amit Shah |
| Term | One-Line Definition | UPSC Relevance |
|---|---|---|
| Delimitation | Redrawing boundaries of parliamentary/assembly constituencies based on census population | Core of all three Bills |
| Seat Freeze | Constitutional bar on changing state-wise Lok Sabha seat count — active since 1976 based on 1971 Census | Why 131st Bill was needed |
| Nari Shakti Vandan Adhiniyam | 106th Amendment Act, 2023 — 33% women's reservation in LS & State Assemblies | Trigger for 131st Bill |
| Special Majority (Art. 368) | Majority of total House membership AND ≥⅔ of members present & voting | Why Bill failed — 298 vs 352 |
| Demographic Penalty | Loss of representation by states that successfully reduced population growth | Southern states' objection |
| Delimitation Commission | Independent statutory body that redraws constituencies; orders unchallengeable in court | Composition MCQ |
| Article 334A | Inserted by 106th Amendment; links women's reservation commencement to Census + delimitation | Key article for MCQs |
| Parameter | Detail |
|---|---|
| Bill Type | Constitutional Amendment Bill (Article 368) |
| Amendment Number | 131st (proposed — not passed) |
| Articles Targeted | Article 81 · Article 82 · Article 334A |
| Introduced in | Lok Sabha — 16 April 2026 |
| Status | ❌ DEFEATED — 17 April 2026 (298 for, 230 against; 352 needed) |
| Historical significance | First Modi govt Constitutional Amendment Bill failure — first in 12 years |
| State ratification needed? | Yes — Art. 368(2) proviso: Bills affecting state representation need ≥ half State Legislatures |
The current Lok Sabha has 543 seats. The constitutional maximum is 550 (530 states + 20 UTs). The 131st Bill proposed raising this cap to 850 (815 states + 35 UTs) — a 54.6% increase in the maximum.
Students write "from 543 to 850" — wrong. The Bill raised the constitutional maximum from 550 → 850. Current actual seats = 543; constitutional cap = 550. Also, only the 131st Amendment Bill was a CAB; the Delimitation Bill was an ordinary bill.
| Article | Current Provision | 131st Bill Proposed | Significance |
|---|---|---|---|
| Art. 81 | Max Lok Sabha = 550 (530 from states + 20 from UTs); seats proportional to population | Raise max to 850 (815 states + 35 UTs) | Primary seat-count provision |
| Art. 82 | Delimitation after every census; frozen until first census after 2026 | Delete freeze proviso; Parliament decides census & timing by simple majority | Core delimitation mandate |
| Art. 170 | State Assembly composition; also frozen on 1971 Census basis | Remove freeze; allow fresh reallocation | State-level representation |
| Art. 334A | Inserted by 106th Amendment (2023); women's reservation activates after census + delimitation | Allow activation post-delimitation without waiting for post-2026 census | Women's reservation trigger |
| Art. 368 | Amendment procedure: special majority (majority of total membership + ⅔ of present & voting) | Not amended — governs passage of 131st Bill itself | Special majority requirement |
| Art. 80 | Rajya Sabha max 250 members | Left unchanged — Bill did NOT touch Rajya Sabha | RS-LS ratio shifts |
| Art. 75 | Council of Ministers ≤ 15% of LS total seats | Not amended — but Cabinet could grow from max 81 → 122 ministers | Constitutional side-effect of expansion |
| Act / Amendment | Year | What It Did | Prelims Hook |
|---|---|---|---|
| 42nd Amendment | 1976 | Froze LS seat numbers per state based on 1971 Census — initially until 2001 | Emergency era; Indira Gandhi govt |
| 84th Amendment | 2001 | Extended freeze until first census after 2026; allowed internal boundary adjustments using 2001 Census | Population control incentive |
| 87th Amendment | 2003 | Allowed 2001 Census to redraw constituency boundaries (not seat numbers) | Boundaries changed, seats unchanged |
| 91st Amendment | 2003 | Council of Ministers ≤ 15% of LS strength; anti-defection for mergers | Side-effect of 131st Bill |
| 106th Amendment (Nari Shakti Vandan Adhiniyam) | 2023 | 33% women's reservation in LS + State Assemblies; inserted Art. 330A, 332A, 334A; linked to census + delimitation; notified into force 16 Apr 2026 | Direct trigger for 131st Bill |
| Delimitation Act 2002 | 2002 | Governed last delimitation (2002–08); Delimitation Bill 2026 sought to repeal it | Still in force after Bill's withdrawal |
| Type | Requirement | Example | 131st Bill |
|---|---|---|---|
| Simple majority | Majority present & voting | Art. 2, Art. 3 (new/alter states) | Not applicable |
| Special majority only | Majority of total + ≥⅔ present & voting in EACH House | FR amendments, Art. 13, 19 | Baseline requirement |
| Special majority + State ratification | Special majority + ratification by ≥ ½ State Legislatures | Art. 54, 55; representation of states in Parliament | YES — required for 131st Bill |
If passed, the LS:RS ratio would have changed from 2.2:1 to 3.3:1. A government with 56% of LS seats could override a 2/3 RS opposition majority in a joint sitting — a significant federal power shift.
The Delimitation Bill, 2026 was an ordinary bill — NOT a CAB. Only the Constitution (131st Amendment) Bill required special majority. The Delimitation Bill was withdrawn (not voted upon) after the CAB failed.
| Country | Lower House | Seats | Population (approx.) | Pop. per MP |
|---|---|---|---|---|
| 🇨🇳 China | NPC (unicameral) | 2,980 | 1.4 bn | ~4.7 lakh |
| 🇩🇪 Germany | Bundestag | ~736 | 84 million | ~1.1 lakh |
| 🇬🇧 UK | House of Commons | 650 | 67 million | ~1 lakh |
| 🇫🇷 France | National Assembly | 577 | 68 million | ~1.2 lakh |
| 🇺🇸 USA | House of Representatives | 435 | 330 million | ~7.6 lakh |
| 🇮🇳 India (current) | Lok Sabha | 543 | 1.4 bn | ~25.8 lakh |
| 🇮🇳 India (proposed 131st Bill) | Lok Sabha | 850 | 1.4 bn | ~16.5 lakh (still highest among democracies) |
| Parameter | Current (Art. 81) | Proposed (131st Bill) | Change |
|---|---|---|---|
| Max total seats | 550 | 850 | +300 (+54.5%) |
| Max seats from states | 530 | 815 | +285 |
| Max seats from UTs | 20 | 35 | +15 |
| Actual seats (elected) | 543 | ~815–850 (post-delimitation) | +272–307 |
| Rajya Sabha max | 250 (Art. 80) | 250 — UNCHANGED | 0 |
| LS:RS ratio (actual) | 2.2:1 | 3.3:1 (approx.) | RS relatively weakened |
| Council of Ministers max | 81 (15% of 543) | ~122 (15% of 815) | +41 potential ministers |
| Census basis for seats | 1971 Census (frozen) | 2011 Census (proposed) | 50-year demographic jump |
| Parameter | Number | Note |
|---|---|---|
| MPs present & voting | 528 | Full house = 543 |
| Votes in favour | 298 | Simple majority achieved but not special |
| Votes against | 230 | United opposition — South, NE, INDIA bloc |
| Required (⅔ of 528) | 352 | Art. 368 special majority threshold |
| Shortfall | 54 votes | Decisive defeat |
| Historical significance | First Modi govt CA Bill defeated | First Constitutional Amendment failure in 12 years |
India's population grew from 54.79 crore (1971) to ~141 crore (2025) — a 2.57x increase — while Lok Sabha seats remained frozen at 543 since 1973/1977. The "one person, one vote, one value" principle is significantly distorted.
Meghraj Kothari v. Delimitation Commission (1966) — 5-Judge Bench
SC held: Orders of the Delimitation Commission, once published in the Official Gazette, have the force of law and cannot be questioned in any court. Core MCQ fact — judicial immunity of delimitation orders.
Kesavananda Bharati v. State of Kerala (1973) — 13-Judge Bench
Established the Basic Structure Doctrine. Opposition used this to argue that the 131st Bill's shift toward population-proportional allocation may undermine federalism — a constitutionally protected basic feature.
Indira Nehru Gandhi v. Raj Narain (1975) — 5-Judge Bench
Confirmed that free and fair elections and representative democracy are part of the Basic Structure. Opposition argued that a delimitation "penalising" southern states undermines equal representation.
Rajendra Singh Rana v. Swami Prasad Maurya (2007) — SC Constitution Bench
Reaffirmed that delimitation orders are final and binding on all courts. Relevant to unchallengeable status of Delimitation Commission's decisions under all frameworks.
Mohd. Saeed Siddiqui v. State of U.P. (2014)
SC recognised that Art. 82 creates a constitutional mandate for delimitation after each census, and that the freeze created representational inequities — used to justify 131st Bill's "one person, one vote" rationale.
Anoop Baranwal v. Union of India (2023) — 5-Judge Bench
SC directed reform of Election Commission appointment process. Linked to proposed 2026 Delimitation Commission including CEC as member — raises institutional independence questions.
UPSC tests Meghraj Kothari (judicial immunity of delimitation orders), Kesavananda Bharati (basic structure), and the 42nd/84th Amendment freeze frequently. The 131st Bill is a high-probability Prelims 2026–27 topic combining all three angles.
| Feature | Current Position | Proposed Change | Significance |
|---|---|---|---|
| Seat Expansion (Art. 81) | Max 550 (530 states + 20 UTs) | Max 850 (815 states + 35 UTs) | Largest LS in history; smaller constituencies |
| Delimitation Timing (Art. 82) | Mandatory after every census; frozen until post-2026 census | Parliament may decide timing & census by simple majority law | Shift from constitutional mandate to executive discretion |
| Census to Be Used | First census after 2026 (=2031+) | 2011 Census (latest published) — via Delimitation Bill 2026 | 50-year demographic data drives redistricting |
| Women's Reservation (Art. 334A) | Tied to post-2026 census + delimitation = ~2034 | Activated immediately after new delimitation (2011 Census) | Would have enabled 33% quota by 2029 elections |
| Rajya Sabha (Art. 80) | Max 250 | Unchanged | LS:RS ratio shifts from 2.2:1 to 3.3:1 |
| Parameter | 2002 Commission (Last) | Proposed 2026 Commission |
|---|---|---|
| Chairperson | Retired SC Judge (Justice Kuldip Singh) | Serving or retired SC Judge (Central Govt appoints) |
| Members | CEC + State Election Commissioners | CEC (or nominated EC) + State Election Commissioners |
| Associate Members | MPs nominated (no voting rights) | 5 MPs + 5 MLAs per state (no voting rights) |
| Legal Status of Orders | Unchallengeable in courts | Same — unchallengeable |
| Census Used | 2001 Census | 2011 Census (latest published) |
| Powers | Redraw boundaries only (seats frozen) | Redraw + reallocate seats + determine women's reserved seats |
| Safeguard | For Whom | Provision |
|---|---|---|
| ST seat protection | Northeastern states (AP, Mizoram, Nagaland, Tripura, Meghalaya) | Art. 332 amendment — ST seat share not reduced |
| Associate members | State representation in process | 5 MPs + 5 MLAs per state (no vote) |
| Judicial head | Commission independence | SC Judge as Chairperson (not political appointee) |
| SC/ST women's sub-reservation | SC/ST women | 1/3 of SC/ST reserved seats to go to women of those communities |
| Rotation of seats | Prevent permanent exclusion | Women's reserved seats rotated after each delimitation |
| Concept | Article / Act | Connection to 131st Bill |
|---|---|---|
| Lok Sabha composition | Art. 81 | Primary article amended — seat cap 550→850 |
| Delimitation mandate | Art. 82 | Freeze proviso deleted; Parliament gets timing control |
| State Assembly composition | Art. 170 | Freeze on state assembly seats also lifted |
| Women's reservation trigger | Art. 334A (106th Amend.) | Amend to activate post-delimitation, not post-census |
| Amendment procedure | Art. 368 | Special majority + state ratification required; Bill failed |
| Federal structure (Basic Structure) | Kesavananda Bharati (1973) | Opposition argued Bill undermines federal balance |
| Council of Ministers size | Art. 75 + 91st Amendment | LS expansion → Cabinet can grow from 81 to 122 |
| Rajya Sabha powers | Art. 80; Joint Sitting rules | LS:RS ratio changes — LS more dominant in joint sittings |
| Right to equality | Art. 14 | "One person, one vote, one value" — govt's rationale |
| DPSP: equal justice | Art. 39A | Proportional political representation = DPSP angle |
| Population control freeze | 42nd/84th Amendments | Freeze was population-control incentive; 131st Bill removes it |
| Delimitation Commission | Delimitation Act 2002 | Proposed Delimitation Bill 2026 to replace it; still in force after defeat |
131st Bill is the intersection of 5 UPSC themes: (1) Parliamentary Representation, (2) Federalism, (3) Gender Justice, (4) Constitutional Amendment Procedure, (5) Census & Delimitation Policy. One topic = five GS-II angles. Maximum return for revision time.
Even with 850 seats, India's population-per-MP ratio (~16.5 lakh) would remain far higher than any comparable democracy — UK: 1 lakh/MP; Germany: 1.1 lakh/MP; USA: 7.6 lakh/MP. India remains a global outlier in under-representation.
Three Bills introduced simultaneously in Lok Sabha on 16 April 2026: (1) Constitution (131st Amendment) Bill, 2026 — expand LS to 850 seats, amend Art. 81, 82, 334A; (2) Delimitation Bill, 2026 — Delimitation Commission using 2011 Census, chaired by SC Judge; (3) Union Territories Laws (Amendment) Bill, 2026 — extending changes to Delhi, Puducherry, J&K. Simultaneously, the 106th Constitutional Amendment (Nari Shakti Vandan Adhiniyam) was notified into force on 16 April 2026 — three years after receiving Presidential assent in September 2023.
131st Amendment Bill DEFEATED in Lok Sabha on 17 April 2026 — first failure of a Constitutional Amendment Bill brought by the Modi government in 12 years. Vote count: 298 in favour, 230 against, 528 MPs present. Required: 352 votes (⅔ of 528 under Art. 368). Shortfall: 54 votes. Opposition — INDIA bloc, southern state parties (DMK, TRS, YSRCP), northeastern parties — voted against. Government withdrew Delimitation Bill, 2026 and UT Laws (Amendment) Bill, 2026 following the defeat.
Tamil Nadu CM MK Stalin hailed the defeat as "a victory for federal balance and democratic principles," saying southern states had "spoken in one voice." TMC MP Abhishek Banerjee: "The attempt to expand the Lok Sabha to 850 seats and push delimitation based on the 2011 Census raised serious concerns about fairness and balance. The NDA government is clearly on borrowed time." Opposition's two demands were: (1) guarantee proportional representation in Bill text (not verbal assurance), and (2) delink women's reservation entirely from delimitation.
Key constitutional side-effects identified: (a) LS:RS ratio shifts 2.2:1 → 3.3:1 — government with 56% LS seats could override a ⅔ RS opposition majority in joint sitting; (b) Council of Ministers cap grows from 81 to ~122; (c) Parliament gaining power to decide census timing by simple majority — weakens constitutional safeguard; (d) Delimitation Commission orders unchallengeable in any court; (e) Bill's defeat means Delimitation Act 2002 remains governing law.
Census 2027 officially announced to be conducted in two phases with caste enumeration (PIB press release, June 4, 2025; reference date March 1, 2027). Consequence under existing Art. 334A (106th Amendment): women's reservation requires Census 2027 → delimitation → election on new map. Given the 2002–08 Commission took 6 years, implementation before ~2034 is unlikely.
The defeat of the 131st Amendment Bill is a top-priority UPSC Prelims 2026/2027 question. Likely question types: (1) Statement T/F on vote count, (2) Pair-matching on Articles amended, (3) Which bills were withdrawn vs defeated, (4) Constitutional max 550 vs actual 543, (5) Why state ratification was required. Memorise: 298 · 352 · 230 · 528 · 17 April 2026.
| # | Statement | T/F | Reason |
|---|---|---|---|
| 1 | The 131st Bill proposed increasing Lok Sabha seats from 543 to 850. | ❌ | Raised constitutional maximum from 550 → 850. Actual seats = 543; constitutional cap = 550. |
| 2 | The Bill amended Articles 81, 82, and 334A. | ✅ | These were the three articles correctly targeted for amendment. |
| 3 | The Delimitation Bill, 2026 was a Constitutional Amendment Bill requiring a special majority. | ❌ | Only the 131st Amendment Bill was a CAB. Delimitation Bill 2026 was an ordinary bill. |
| 4 | The 131st Amendment Bill was defeated in the Rajya Sabha. | ❌ | Defeated in Lok Sabha — 298 for, 352 needed. |
| 5 | The 42nd Amendment (1976) froze seats based on the 1981 Census. | ❌ | Froze based on 1971 Census — not 1981. |
| 6 | Under the proposed 131st Amendment, Parliament could decide the census to use for delimitation by passing a simple majority law. | ✅ | Key provision — shifts from constitutional mandate to parliamentary discretion. |
| 7 | The 106th Amendment (Nari Shakti Vandan Adhiniyam) was passed with a unanimous RS vote. | ✅ | RS voted 214:0 (unanimous). LS: 454:2 (Sep 2023). |
| 8 | Article 80 (Rajya Sabha) was proposed to be amended by the 131st Bill. | ❌ | Rajya Sabha maximum (250) was deliberately left unchanged. |
| 9 | The 131st Bill required state ratification by at least half State Legislatures. | ✅ | Art. 368(2) proviso — Bills affecting state representation require state ratification. |
| 10 | Women's reservation is now expected to operate around 2034. | ✅ | Under Art. 334A (106th Amendment): needs Census 2027 + delimitation; ~2034 is earliest realistic date. |
543 (actual) ≠ 550 (constitutional maximum). The Bill raised the cap from 550 to 850. Never write "from 543 to 850" — the correct statement is "from 550 to 850."
Only the Constitution (131st Amendment) Bill was a CAB. The Delimitation Bill 2026 and UT Laws Amendment Bill 2026 were ordinary bills — they were withdrawn, not defeated, after the CAB failed.
The 42nd Amendment (1976) froze seats based on the 1971 Census. The 84th Amendment (2001) extended this freeze. The proposed 131st Bill would have used the 2011 Census — NOT the 2021 or 2027 Census.
The 106th Amendment inserted three NEW articles: Art. 330A (LS women's seats), Art. 332A (State Assembly women's seats), Art. 334A (commencement condition). It also amended existing Art. 239AA (Delhi). Students confuse "inserted" vs "amended."
Defeat: Lok Sabha (not RS). Exact figures: 528 present · 298 for · 230 against · 352 needed. Shortfall = 54 votes. UPSC may test these exact numbers as statements.
Expect: (1) 2-statement T/F questions on provisions, (2) Pair-matching: Article number ↔ provision, (3) Chronological ordering of delimitation exercises (1952 → 1963 → 1973 → 2002–08), (4) Who chairs Delimitation Commission (SC Judge), (5) Article 368 — which amendment category requires state ratification.
| Case / Amendment / Event | Year | Key Number / Holding | UPSC Link |
|---|---|---|---|
| 42nd Constitutional Amendment | 1976 | Froze LS seats at 1971 Census levels until 2001 | Art. 82 freeze origin |
| 84th Constitutional Amendment | 2001 | Extended freeze to first census after 2026 | Current delimitation status |
| 87th Constitutional Amendment | 2003 | Boundary redraw on 2001 Census; seat count unchanged | Last constituency boundary change |
| 91st Constitutional Amendment | 2003 | CoM ≤ 15% of LS strength; anti-defection reform | Side-effect of LS expansion |
| 4th Delimitation Commission | 2002–08 | Chaired by Justice Kuldip Singh; 2001 Census basis | Last delimitation exercise |
| 106th Constitutional Amendment (Nari Shakti Vandan Adhiniyam) | 2023 | 33% women's reservation; Art. 330A, 332A, 334A inserted; LS 454:2; RS 214:0; 15-yr sunset clause; notified 16 Apr 2026 | Direct trigger for 131st Bill |
| Meghraj Kothari v. Delimitation Commission | 1966 | Delimitation orders unchallengeable in courts | Judicial immunity of Commission |
| Kesavananda Bharati v. State of Kerala | 1973 | Basic Structure Doctrine — 13-judge bench | Federal structure argument vs 131st Bill |
| 131st Amendment Bill introduced | 16 Apr 2026 | Art. 81, 82, 334A targeted; 3-Bill package; 106th Amendment notified | Prelims 2026–27 highest priority |
| 131st Amendment Bill DEFEATED | 17 Apr 2026 | 298 for · 230 against · 528 present · 352 needed; first Modi govt CA Bill failure | Special majority; Art. 368 |
| Census 2027 announced (PIB) | Jun 2025 | Two phases; caste enumeration; reference date March 1, 2027 | Women's quota timeline — ~2034 |
What: CAB to expand LS constitutional max 550→850 · amend Art. 81, 82, 334A · 2011 Census basis for delimitation · fast-track 33% women's reservation by 2029.
When: Introduced 16 Apr 2026 · Defeated 17 Apr 2026.
Why defeated: Art. 368 special majority not met (298 < 352); united opposition on demographic penalty fears.
Fallout: Delimitation Bill + UT Laws Bill withdrawn · Women's reservation pushed to ~2034.
Key linkage: 106th Amendment (2023) = Nari Shakti Vandan Adhiniyam = Art. 330A + 332A + 334A (inserted) + Art. 239AA (amended).