Examine the constitutional and federal implications of altering the census basis for delimitation of Lok Sabha constituencies.

Article 82 requires that seats in the Lok Sabha be readjusted after every census, but the 84th Amendment Act, 2002 froze state-wise allocation at 1971 levels until the first census after 2026 [1]. The Delimitation Bills of 2026 sought to replace this automatic constitutional trigger with a Parliament-determined census basis — a shift that touches both the design of representation and the federal bargain.

Constitutional implications

• Dilution of an entrenched safeguard: the Constitution (131st Amendment) Bill, 2026 would have let Parliament decide by ordinary law when delimitation occurs and which census applies, replacing the mandate of readjustment "after every census" with legislative discretion [2].
• Loss of certainty: PRS flagged reduced constitutional certainty on delimitation timing and census selection, weakening predictability in a core electoral rule [2].
• Scale of the House: maximum strength was to rise from 550 to 850 (815 States, 35 UTs), shifting the Lok Sabha–Rajya Sabha ratio to 3.3:1 and enlarging the Council of Ministers' 15% ceiling [2].
• Rigidity as protection: needing a two-thirds majority, the Bill was negatived on 17 April 2026 — evidence that the amending procedure itself functions as a federal check [2].

Federal implications

• Redistribution against demographic performers: using the 2011 Census, Uttar Pradesh and Bihar would gain seats while Tamil Nadu and Kerala lose share — penalising states that succeeded at population stabilisation, the very goal the 1971 freeze incentivised [1].
• Asymmetry of voice: a population-only formula narrows smaller and southern states' weight in the Lok Sabha without a compensating chamber, since the Rajya Sabha too is population-weighted.
• Linked equity claim: the freeze's removal also decoupled the one-third women's reservation from a post-2023 census, changing its timeline [1].

Delimitation is unavoidable — representation cannot stay frozen indefinitely — but its basis must be settled through consensus, not majority arithmetic. A phased formula, capped seat-loss for demographically responsible states, and reference to a parliamentary committee or the Inter-State Council would let India honour both political equality and cooperative federalism.