Examine how differential fertility rates across Indian states could affect the principle of federal balance in the context of the proposed delimitation exercise.

NFHS-5 (2019-21) recorded India's total fertility rate falling to 2.0, below the replacement level of 2.1, but the aggregate conceals sharp divergence — Bihar at 2.98 against 1.4 in Chandigarh [2]. Since the Delimitation Bill, 2026 proposes to reapportion Lok Sabha seats on population, this demographic gap becomes a question of federal power.

Uneven demographic transition across states

• Only five states remain above replacement fertility — Bihar, Meghalaya, Uttar Pradesh, Jharkhand and Manipur — while the southern and western states have completed the transition [2].
• Fertility stays highest among rural, less-educated and lowest-income women, so the divergence tracks development gaps, not mere geography.

Consequences for federal balance

• Population-based reapportionment would shift relative seat share toward high-fertility northern states, and away from states that achieved stabilisation earliest — the "penalty for good governance" concern.
• The freeze on seat numbers since 1976 was itself a federal bargain to protect population-controlling states; reopening it disturbs a settled compact.
• The Bill also lets Parliament decide the timing and census basis for delimitation, transferring to legislative discretion what was constitutionally fixed [1].
• The Lok Sabha–Rajya Sabha seat ratio would move from 2.2:1 to 3.3:1, weakening the House that represents states as units [1].

Countervailing safeguards

• The base is the 2011 Census, not the post-2026 count, muting the effect of the most recent fertility divergence [1].
• Raising total strength from 550 to 850 means no state loses seats absolutely; the loss is relative voice, and larger Houses improve representation ratios everywhere [1].
• Delinking women's reservation from a post-2026 census allows an equity gain to proceed alongside [1].

Differential fertility thus converts a demographic success into a representational cost — the core federal tension. A calibrated path, pairing population-linked seats with strengthened fiscal devolution and a genuinely empowered Rajya Sabha, can honour "one person, one vote" without penalising states that governed well, keeping cooperative federalism intact.