Every headline about the Delimitation Bill, 2026 seems to boil down to the same North-versus-South tug of war. But there's another fault line running quietly underneath it, one that doesn't pit state against state so much as it decides, seat by seat, whose voice actually gets a guaranteed seat at the table. Delimitation doesn't just decide how many MPs a state sends to Parliament — it decides which specific constituencies are reserved for Scheduled Castes and Scheduled Tribes, and which are not. That distinction has real winners and losers, and right now, it's flying almost entirely under the radar.
The story in 60 seconds
- Reserved seats for Scheduled Castes and Scheduled Tribes aren't fixed forever — they're recalculated every time delimitation happens, based on each state's SC and ST population share.
- Today's Lok Sabha has 84 SC-reserved and 47 ST-reserved seats out of 543 total, a formula last applied using 2001 Census data.
- Within a state, it isn't every high-SC or high-ST constituency that gets reserved — only the ones with the comparatively largest share do, which means seats with real, substantial SC populations can and do miss out.
- Constituencies like Habibpur in West Bengal (48.9% SC population), Aurangabad in Bihar (29% SC) and Hasan in Karnataka (20% SC) remain unreserved today, despite SC shares well above what would typically qualify a seat elsewhere.
- If India's Census 2011 national SC and ST population shares — 16.6% and 8.6% — were applied proportionally to an 850-seat house, reserved seats could rise to roughly 141 SC and 73 ST, up from 84 and 47 today. That's an illustrative estimate, not an official one.
- Adivasi advocacy groups have separately demanded that political reservation for Dalits and tribal communities be increased outright, in step with population growth, rather than simply carried forward unchanged.
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While North and South slug it out over the headline seat count, a quieter, no-less-consequential question is riding on the same bill: which specific constituencies get reserved for Scheduled Castes and Scheduled Tribes, and which get left out in the cold. The formula is public. The stakes are real. Almost nobody outsid
Switch to ShortsHow a seat actually becomes "reserved"
The rulebook here isn't secret, even if it rarely makes headlines. Article 330 of the Constitution requires that the number of seats reserved for Scheduled Castes or Scheduled Tribes in a state bear roughly the same proportion to that state's total seats as the SC or ST population bears to the state's total population. In plain terms: if a state's population is one-fifth Scheduled Caste, roughly one-fifth of its Lok Sabha seats should end up reserved for SC candidates.
The harder question is which specific constituencies get that designation, and the answer sits in Section 9(1)(c) of the Delimitation Act: the Commission locates reserved constituencies in the areas where the SC or ST population's proportion to the total population is comparatively the largest. It's a relative ranking exercise, not a fixed percentage threshold — a seat gets reserved because its SC or ST share outranks other seats in the running, not because it crosses some universal cutoff line written into law.
The seats hiding in plain sight
That relative-ranking design produces a genuinely strange outcome once you actually look at the data: plenty of constituencies with substantial, even overwhelming, SC populations remain unreserved simply because other seats in their state ranked marginally higher. Habibpur in West Bengal carries a Scheduled Caste population of 48.9% — nearly half the constituency — and is not reserved. Aurangabad in Bihar, at 29% SC population, isn't either. Hasan in Karnataka, at 20%, rounds out the pattern. These aren't marginal cases or rounding errors; they're seats where, by any everyday reading of the numbers, a strong case for reservation exists, sitting unreserved because the Commission's 2001-data ranking put other constituencies ahead of them in line.
None of this means the current system is being run in bad faith — it's a mechanical consequence of a formula that hasn't been recalculated in a quarter-century, applied to a country whose internal demographics haven't stood still. Whatever else the 2026 delimitation does or doesn't resolve, it will, almost as a side effect, reshuffle this entire map: seats that missed out last time by a hair could finally qualify, and some currently reserved seats could lose that status if newer data puts them behind fresher contenders.
Doing the math on an 850-seat house
Nobody has published an official Delimitation Commission projection for reserved seats — that body doesn't exist yet, same as with the state-by-state seat counts we've covered elsewhere in this series. But a back-of-the-envelope estimate is at least informative, if you're honest about its limits. Census 2011 put India's national Scheduled Caste population at 16.6% and its Scheduled Tribe population at 8.6%. Applying those shares proportionally to a fully expanded 850-seat Lok Sabha — a simplification, since the real formula runs state by state, not off a single national percentage — works out to roughly 141 SC-reserved seats and 73 ST-reserved seats, up from 84 and 47 today.
Take that estimate with the same grain of salt this series has applied to every other unofficial number in circulation: it's illustrative, not authoritative, and the real figure will depend entirely on how the eventual Commission actually runs its state-by-state calculations. What it does illustrate honestly is the scale of the shift. Even a rough estimate points to dozens more reserved seats nationally, purely because the pie itself is growing — which is a genuinely different, and considerably less contentious, story than the state-vs-state seat fight dominating the headlines.
The representation gap that's driving all of this
It helps to step back and see why any of this recalculation is happening at all. Because seat counts have been frozen since 1976 while India's population kept growing unevenly, the number of citizens a single MP represents now varies wildly by state. In Bihar, each Member of Parliament currently represents roughly 3.1 million citizens; in Kerala, the figure is closer to 1.75 million. That near two-to-one gap is the underlying imbalance every part of this bill — the North-South seat math, the Commission's mandate, and the SC/ST reservation recalculation alike — is ultimately trying to address, each from a different angle.
What advocacy groups are actually asking for
For Dalit and Adivasi political organisations, the conversation isn't only about how the existing formula gets rerun — some are pushing to change the formula's ambition altogether. The Congress party's Adivasi wing has publicly demanded that political reservation for Scheduled Castes and Scheduled Tribes be increased by 2 percentage points, both nationally and within individual states, arguing that reservation levels should track population growth over time rather than simply being recalculated within the existing proportional ceiling. That's a materially different ask than "recalculate the current formula fairly" — it's a call to expand the formula's baseline itself, and it's likely to surface as its own flashpoint if and when a new Commission actually convenes.
It's also worth noting, briefly and carefully, that the mechanics of how reserved constituencies get drawn have separately raised concerns beyond the SC/ST question. Findings associated with the Sachar Committee, a government-commissioned review of the socio-economic status of Muslims in India, noted that constituencies reserved for Scheduled Castes have sometimes included substantial Muslim populations — in some cases a majority — a pattern that intersects with, but is distinct from, the Dalit and Adivasi representation questions this piece focuses on, and deserves its own separate examination rather than a passing mention here.
Claim versus evidence
- Confirmed: Reserved-seat counts for SCs and STs are recalculated at every delimitation, under a formula set out in Article 330 and Section 9(1)(c) of the Delimitation Act.
- Confirmed: Several constituencies with substantial SC populations — Habibpur (48.9%), Aurangabad (29%) and Hasan (20%) among them — remain unreserved under the current, 2001-data-based allocation.
- Illustrative, not official: Reserved SC and ST seats could rise to roughly 141 and 73 respectively under an 850-seat house, based on a simple proportional estimate using Census 2011 national shares — not a Commission-verified figure.
- Confirmed: Adivasi Congress has publicly demanded a 2-percentage-point increase in SC/ST political reservation, a distinct ask from simply recalculating the existing formula.
- Separate and not covered in depth here: Concerns about how reserved-constituency design intersects with Muslim political representation, raised in Sachar Committee-linked findings — a related but distinct question from the SC/ST focus of this piece.
What to watch next
If a Delimitation Commission is eventually formed, its published draft proposals — the same gazetted notices and state-by-state public hearings the 2002-08 exercise relied on — will be the first place any of this becomes concrete rather than estimated. Watch, in particular, for which currently unreserved high-SC and high-ST seats finally cross the threshold, and which currently reserved seats don't survive the recount. That's where this story stops being about aggregate numbers and starts being about specific constituencies, specific communities, and specific political careers.
Frequently asked questions
How many Lok Sabha seats are currently reserved for SCs and STs?
84 seats are reserved for Scheduled Castes and 47 for Scheduled Tribes, out of 543 total, under the formula last applied using 2001 Census data.
Why do some high-SC-population seats remain unreserved?
Reservation is a relative ranking within each state, not a fixed percentage cutoff — a constituency is reserved if its SC or ST share ranks among the highest in its state, so seats with real but comparatively lower shares can miss out even with substantial populations.
Will reserved seats definitely increase under the new bill?
Almost certainly in absolute numbers, since the total house is growing substantially and the formula is proportional — but the exact count depends on a Delimitation Commission calculation that has not yet been carried out.
Is this the same issue as the North-South seat fight?
No — it's a related but separate question. The North-South debate is about how many total seats each state gets; the SC/ST question is about which specific constituencies within any state's allocation are reserved for Dalit and Adivasi candidates.
Sources
- Article 330 — Reservation of Seats for SC/ST in Lok Sabha — Model Diplomat
- In tables: Delimitation could also cut SC, ST and Muslim representation — Scroll.in
- Congress Adivasi wing demands increase in political reservation for SC, ST — Deccan Herald
- Scheduled Tribes in India: As revealed in Census 2011 — PARI (Rural India Online)
- The Delimitation Bill, 2026 — PRS Legislative Research
Full forms
- SC — Scheduled Caste
- ST — Scheduled Tribe
- MP — Member of Parliament
- PRS — PRS Legislative Research
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