The Delimitation Bill, 2026, was tabled in Parliament on April 16 during the opening day of a Special Session, establishing a new Delimitation Commission to redraw India's parliamentary and assembly constituency boundaries using Census 2011 data. The Bill is the second of a three-Bill package — alongside the Constitution (131st Amendment) Bill expanding Lok Sabha to 850 seats and the Union Territories Laws (Amendment) Bill — aimed at operationalising 33% women's reservation by the 2029 general elections.
Background
India's parliamentary constituencies have not been redrawn since the delimitation exercise based on 1971 Census data, following a freeze imposed by the Constitution (Forty-Second Amendment) Act, 1976. Assembly constituency boundaries were last adjusted using 2001 Census data. The Constitution (106th Amendment) Act, 2023 — the Nari Shakti Vandan Adhiniyam — mandated one-third reservation for women in Lok Sabha and State Assemblies but made implementation conditional on a fresh delimitation exercise. With the 2021 Census still incomplete, the Government chose to proceed using Census 2011 data by proposing an amendment to Article 82 that removes the existing proviso requiring delimitation to follow "the first Census done after 2026."
Key Provisions
Delimitation Commission composition: The Commission will be headed by a sitting or former Supreme Court judge, with the Chief Election Commissioner (or a nominated Election Commissioner) and relevant State Election Commissioners as ex officio members. Ten associate members per state — five Lok Sabha MPs and five State Assembly members — will assist the Commission's deliberations.
Census basis: The Bill provides that delimitation shall proceed on Census 2011 figures, departing from the existing constitutional requirement to use the most recent census. This avoids dependency on the delayed 2021 Census.
Scope: The Commission will readjust seat allocation among states in both Lok Sabha and State Legislative Assemblies, and redraw territorial constituency boundaries based on population, administrative boundaries, physical features, and public convenience.
Women's reservation trigger: By completing delimitation before 2029, the Bill removes the procedural barrier to implementing 33% women's reservation under the 106th Amendment.
Implications for Practitioners
The three-Bill package represents the most significant restructuring of India's electoral architecture since 1976. Constitutional lawyers should note three distinct litigation triggers: first, the change in census basis from the most recent census to Census 2011 may face challenge on grounds of reasonableness under Article 14, since 15-year-old data will be used for seat allocation. Second, the state-wise seat redistribution will disproportionately benefit higher-population states, which southern states argue penalises their demographic restraint. Third, the BJP's three-line whip to all MPs for April 16-18 signals the Government intends to push the package through quickly, raising potential procedural challenges if adequate debate time is not provided for a constitutional amendment requiring a two-thirds majority under Article 368.
Frequently Asked Questions
When will the new delimitation exercise be completed?
The Delimitation Bill 2026 does not specify a fixed completion date, but the Government has indicated that the goal is to operationalise the new constituency boundaries in time for the 2029 Lok Sabha elections. The Commission will use Census 2011 data, avoiding any dependency on the delayed 2021 Census.
Will southern states lose Lok Sabha seats under the new delimitation?
No state will lose existing seats. The expansion from 543 to 850 Lok Sabha seats means all states gain seats, but states with higher population growth — primarily in the north — gain proportionally more. Southern states like Tamil Nadu and Kerala, which successfully controlled population growth, gain fewer additional seats relative to states like Uttar Pradesh and Bihar.