Sub-categorisation of reserved categories is a step toward substantive equality, but its implementation poses federal and administrative challenges. Comment.

Sub-categorisation means splitting the Scheduled Caste/Scheduled Tribe lists into sub-groups so that quotas reach the most deprived within them. In State of Punjab v. Davinder Singh (2024), a seven-judge Bench by 6:1 upheld this power of States, overruling E.V. Chinnaiah (2004) [1]. It is a genuine advance toward substantive equality, though its success depends on how carefully States execute it.

How it advances substantive equality

• Recognises graded backwardness: the Court noted that systemic discrimination prevents many SC members from climbing the ladder, and that Article 14 permits reasonable classification within a class [2].
• Shifts reservation from formal parity to outcome-based targeting, ensuring the most marginalised sub-castes are not crowded out by relatively better-placed ones.
• Retains constitutional fidelity — sub-classification operates under Articles 15 and 16 without altering the Presidential lists under Article 341 [1].

Federal challenges

• Sub-classification is a State-exercised power over a centrally notified list, creating scope for divergent State schemes and demands for a uniform central framework [1].
• Uneven adoption across States can produce inter-State inequity, as identical communities face different quota treatment.
• Politically sensitive: the Centre has resisted the related proposal of a creamy layer for SCs/STs, holding that Article 341 contains no provision for such exclusion [3], and treated the Court's observation on it as "merely a viewpoint" [4].

Administrative challenges

• States must justify sub-quotas with empirical data on inadequate representation — yet disaggregated caste-wise socio-economic data remains thin.
• Risk of litigation and sub-group rivalry, since any allocation invites challenge for being arbitrary or excessive.

Sub-categorisation is therefore best seen as an enabling tool, not a self-executing remedy. A credible way forward lies in building reliable disaggregated data systems, framing transparent and periodically reviewed criteria, and consultative Centre-State coordination. Executed thus, it fulfils the Constitution's promise of equality of opportunity in substance and not merely in form.