Scheduled Castes and Scheduled Tribes consist of several communities that may differ considerably in their levels of education, employment, social backwardness and access to reservation. Sub-categorisation seeks to divide a reserved category into smaller groups and distribute the existing quota among them so that relatively more disadvantaged and under-represented communities receive an equitable share of its benefits.

State of Punjab v. Davinder Singh (2024): A seven-judge Constitution Bench, by a 6:1 majority, upheld the constitutional permissibility of sub-classification within the Scheduled Caste and Scheduled Tribe categories.

Conceptual Distinction: Sub-Categorisation vs. Creamy Layer

Although often discussed together in affirmative action discourse, these two legal concepts serve entirely different constitutional purposes:

Sub-categorisation: This tool divides an existing reservation quota into smaller shares within a category to ensure that more backward groups get guaranteed representation. It does not deny reservation to anyone; it simply redistributes the existing reserved quota among different sub-groups.
Creamy Layer Exclusion: This tool identifies individuals or families within a backward class who have achieved significant social, educational, and economic advancement, and excludes them entirely from availing reservation benefits

Sub-Categorisation	Creamy-Layer Exclusion
Operates at the level of castes or communities	Operates at the level of individuals or families
Creates groups within an existing reserved category	Excludes relatively advanced individuals from reservation benefits
Redistributes the quota among sub-groups	Changes individual eligibility for reservation
Focuses on relative group backwardness and representation	Focuses on individual or family advancement
Does not remove any group from the Presidential List	Does not remove the individual’s caste from the Presidential List
Expressly permitted for SC/STs in Davinder Singh	No general mandatory rule exists for SC/ST reservation

The Landmark Judicial Milestone: State of Punjab v. Davinder Singh (2024)

On August 1, 2024, a 7-judge Constitution Bench of the Supreme Court, in a 6–1 majority, delivered a landmark judgment permitting the sub-classification of SCs and STs. This judgment explicitly overruled the 2004 E.V. Chinnaiah vs. State of Andhra Pradesh precedent (a 5-judge bench), which had held that Scheduled Castes constitute a single, homogeneous group that cannot be subdivided by states
- Heterogeneity of Scheduled Castes: The Court ruled that Scheduled Castes do not form a homogeneous class. Empirical evidence demonstrates that significant social, economic, and educational inequalities, as well as varying levels of discrimination, persist within different SC sub-castes.
- State Legislative Authority: State Governments are constitutionally empowered to create sub-categories within the SC and ST lists to ensure that reservation benefits are equitably distributed among the most marginalized sections (“the weakest of the weak”).
- Substantive Equality (Article 14): The majority held that sub-classification does not violate the Right to Equality. Article 14 promotes parity of treatment under parity of circumstances (substantive equality) rather than treating unequals as equals (formal equality).
- No Alteration of the Presidential List (Article 341): The Court clarified that sub-classification does not amount to “tinkering” with or altering the Presidential List under Article 341. Under Articles 341 and 342, only the President can notify the SC/ST lists, and only Parliament has the power to include or exclude castes from these lists. Sub-classification merely dictates the proportion of preference in reservations for the most backward castes already within the list, without adding or removing any caste
- Clarification on Indra Sawhney (1992): In Indra Sawhney, a 9-judge bench had permitted sub-classification for Other Backward Classes (OBCs) but left out SCs and STs. The 7-judge bench in Davinder Singh clarified that the exclusion of SCs/STs in Indra Sawhney was simply because the facts of that case pertained strictly to OBC reservations
Strict Criteria and Judicial Review:
- Data: If a state wants to sub-classify SC/STs, it will have to provide ‘quantifiable data’ that indicates a substantial difference in social backwardness between the proposed sub-groups and the rest.
- Such policies are fully subject to judicial review in a court of law.
- Sub-classification can grant preferential treatment, but cannot have the effect of completely excluding any notified caste from the benefits of reservation altogether

Significance of Sub-Categorisation

Benefits the Most Marginalised
- It can ensure that communities with little access to reservation receive a dedicated share.
  - In Andhra Pradesh and Telangana, the Madigas — historically among the most disadvantaged SC communities — argued that Malas, another SC community, were capturing most SC reservation benefits because of their better access to education and urban employment.
Promotes Intra-Category Equality
- It addresses unequal distribution of benefits within the reserved category.
Improves Diversity
- It may increase the representation of a wider range of SC communities in education and public employment.
Prevents Monopolisation
- It reduces the possibility of a few communities repeatedly securing most reserved opportunities.
Strengthens Substantive Equality
- It treats differently placed communities according to their actual levels of disadvantage.
Retains the Existing Quota
- It can improve distribution without reducing the total reservation available to SCs or STs.
Responds to Regional Differences
- States can design policies according to local patterns of backwardness and representation.
Reduces Dependence on Economic Exclusion
- It directs benefits towards under-represented communities without assuming that economic advancement has eliminated caste discrimination.

Key Concerns and Challenges

Fracturing Marginalized Unity
- Critics contend that sub-classification could divide Dalit and Adivasi unity, fracturing solidarity and political cohesion among marginalized communities
- Wedge politics
  - Sub-categorisation may be used by dominant castes and political interests to divide SC/ST communities, creating internal conflicts that weaken the political power of these communities as a whole while appearing to serve their internal equity interests.
Administrative Complexity & Burden
- Scientifically identifying and proving relative degrees of backwardness within closely grouped castes is highly complex and requires periodic, robust socio-economic surveys
- Creating, implementing and periodically reviewing sub-categories would increase the administrative burden on government agencies. It would require regular data collection, separate reservation rosters and clear rules for adjusting unfilled vacancies.
Determining Appropriate Criteria
- Identifying reliable indicators and thresholds for measuring relative backwardness is complex. Governments must decide the appropriate weight to assign to factors such as educational attainment, representation in public employment, income and access to basic amenities.
Risk of Politicization
- There is an ongoing concern that sub-classification could be exploited as a tool for electoral mobilization and “vote-bank politics” rather than being used for genuine social justice
- Governments may design sub-quotas to satisfy electorally influential groups rather than the most disadvantaged.
Competition among Communities
- Sub-categorisation may intensify disputes among communities over the distribution of limited reserved opportunities.
Lack of Reliable Data
- Most states do not systematically maintain community-wise data on educational attainment, representation in different levels of public employment and utilisation of reservation benefits. This makes it difficult to satisfy the Davinder Singh judgment’s requirement that sub-classification must be based on quantifiable evidence rather than political assumptions.
Risk of Permanent Categories
- Once created, sub-categories may continue without periodic evaluation even if representation patterns change.

Way Forward

Evidence-Based Sub-Categorisation
- Scientific and Objective Identification: Any state-level policy creating sub-classifications must be strictly anchored in robust, contemporaneous empirical data that demonstrates relative social backwardness and inadequate representation. The Supreme Court has clarified that these classifications are subject to strict judicial review to prevent political arbitrariness
- Preventing Absolute Exclusion: Sub-classification must be structured as a preferential treatment or an equitable apportionment of vacancies among sub-groups to ensure benefits do not get monopolized by a few dominant sub-castes. Crucially, it must never lead to the complete exclusion of any notified SC/ST caste from reservation benefits altogether
- Independent commission: State Governments should establish independent commission composed of official and non-official experts
  - They should assess the distribution of reservation benefits and recommend sub-categorisation if empirically justified.
  - These commissions must have the authority to examine complaints of wrong inclusion (over-inclusion) or non-inclusion (under-inclusion) in the reservation lists.
  - They should be mandated to conduct periodic revisions of the lists (such as every 10 to 20 years) to dynamically exclude communities that have achieved significant advancement and include those that remain highly marginalized
- Periodic review: Sub-categorisation should be reviewed every ten years as community conditions change through reservation’s cumulative effects. It will ensure that the internal allocation remains responsive to actual patterns of disadvantage rather than becoming permanently fixed.
Transparent Methodology
- Governments should publish the indicators, data and reasoning used to create sub-categories and allocate quota shares.
Separate Approach for STs
- Any sub-categorisation of STs should consider their distinctive geographical, cultural, economic and land-related vulnerabilities.
Community Consultation
- Affected communities should be meaningfully consulted before classifications are finalised.
Complementary Support
- Deploying Alternative Strategies: Because reservations are not a panacea for centuries of deep-rooted, intersectional oppression, the state should prioritize positive, assistive measures that expand opportunity without stripping away protective status.
- Targeted Social Support: The government must invest heavily in non-exclusionary supportive policies, such as:
  - Providing specialized training and coaching to enable the most disadvantaged members of the community to compete effectively.
  - Deploying assistive financial actions, higher education scholarships, concessions, and increasing overall accessibility in remote or historically neglected areas
    - Sub-categorisation must be supported by quality schooling, scholarships, hostels, coaching, skill development and protection against discrimination.
Judicial Oversight
- Courts should examine whether sub-classification is evidence-based, proportionate and consistent with Articles 14, 15, 16, 341 and 342.
Respecting Parliament’s Supremacy
- Under Articles 341 and 342, only the President has the authority to notify the SC/ST lists, and only Parliament has the legislative competence to make final inclusions or exclusions. State-level sub-classifications must be limited to allocating preference in state appointments and must not trespass into altering the composition of the Presidential List

Sub-categorisation seeks to make reservation more equitable by ensuring that its benefits reach communities that remain the most disadvantaged and under-represented. The Davinder Singh judgment has constitutionally enabled such redistribution among SC/STs, but its success depends on reliable data, transparent criteria, periodic review and protection against political manipulation. It should complement, rather than replace, wider measures addressing discrimination, educational deprivation and social exclusion.

Sample Mains Question

1.Sub-categorisation may improve the distribution of reservation benefits among SCs and STs, but it also raises concerns relating to data, political manipulation and fragmentation of marginalised communities. Critically examine. (250 Words, 15 Marks)

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