JoSAA reservation categories explained — GE, OBC-NCL, SC, ST, EWS, PwD

The short version

JoSAA allocates seats from two parallel pools running side by side: a general (open) pool that anyone can compete in, and category pools — OBC-NCL, SC, ST, EWS, and PwD — that reserve seats for eligible candidates. Each round, the algorithm offers you the best seat from either pool you qualify for. You never have to choose between your reservation and the open list; JoSAA picks whichever is more favourable.

The categories, one by one

GE — General / Open

The unreserved pool. Anyone can compete here, regardless of category. If you have no reservation to claim, this is your only pool. If you have a reservation, you still compete here as well — the algorithm just picks the better of your two offers each round.

OBC-NCL — Other Backward Classes, Non-Creamy Layer

27% of central reservation. JoSAA only recognises the Non-Creamy Layer subset of the central OBC list — not state OBC lists. The NCL certificate must be on the format prescribed by the Ministry of Social Justice and Empowerment, issued within the window specified by JoSAA business rules (typically the current financial year). State OBC certificates and creamy-layer OBC certificates are not accepted; candidates with those compete in the general pool.

SC — Scheduled Caste

15% of central reservation. Eligibility follows the central SC list. The caste certificate must be from a competent authority in the prescribed format. There is no income cap — SC reservation is unconditional on income.

ST — Scheduled Tribe

7.5% of central reservation. Same structure as SC: eligibility from the central ST list, no income cap, caste certificate from a competent authority.

EWS — Economically Weaker Sections

10% of central reservation, introduced from JEE 2019 onwards. EWS is for candidates who do not already fall under OBC-NCL, SC, or ST, and whose family income and asset holdings are below the limits notified by the central government. The EWS certificate must be on the prescribed central format and dated within the period JoSAA accepts (typically issued in the current financial year). State-issued EWS certificates not on the central format are rejected.

PwD — Persons with Disability

5% horizontal reservation across the other categories — meaning a PwD candidate also has to be in GE, OBC-NCL, SC, ST, or EWS, and reservation applies on top. Eligibility requires a disability of 40% or more, certified by a UDID-recognised authority on Form V or equivalent. JoSAA verifies the certificate at reporting; any mismatch can invalidate the allotment.

Quota: home state vs other state vs all-India

On top of category, NIT seats are split by quota — Home State (HS), Other State (OS), and All-India (AI) for some special categories.

• HS: 50% of NIT seats are reserved for candidates whose home state matches the NIT's state (as determined by your class-12 board, not your current residence).
• OS: the remaining 50% of NIT seats go to candidates whose home state does not match.
• AI: IITs, IIITs (centrally funded), and most GFTIs do not have an HS/OS split — they allocate purely on all-India rank within each category pool.

Your home state is defined by the state listed on your class-12 board certificate. If you moved states during school, the board that issued your certificate decides your JoSAA home state.

Female-only supernumerary seats (IITs)

To improve gender diversity, IITs run a supernumerary female-only seat pool. These seats are over and above the regular seat matrix and are allocated only to female candidates. The pool is reported alongside the regular seat matrix as a Female (F) sub-pool against the Gender-Neutral (GN) sub-pool. Allocation happens in the same JoSAA rounds.

NITs, IIITs, and GFTIs do not have a supernumerary female pool, but the JoSAA seat matrix still reports GN and F counts per category for transparency on existing gender-distribution patterns.

How the algorithm uses all this

In each round, for every (institute, branch) combination on your preference list, the algorithm checks each pool you are eligible for — your category pool, your gender pool, your quota (HS / OS / AI) — and looks at whether your rank clears the cutoff for any of them. You are offered the highest-ranked preference where any pool clears.

That is why two candidates with the same JEE rank but different categories can be offered very different seats in the same round. The category pool and quota effectively change the rank you are competing against for any given seat.

Documentation: get it right at registration

The category you registered for in JEE Main or JEE Advanced is what flows through to JoSAA — you cannot change it during JoSAA itself. If your category certificate is outdated, in the wrong format, or from the wrong authority, JoSAA will revoke the category-pool component of any seat you have been allocated and place you back in the general pool only. That can change which institute you end up at.

• Get your OBC-NCL / EWS certificate issued in the current financial year.
• Use the central format — not the state format — for OBC-NCL and EWS.
• For SC / ST, the caste certificate has to be from a competent authority in the prescribed format.
• For PwD, secure your UDID and Form V (or equivalent) ahead of registration; the verification at reporting is strict.

Related guides and tools

• JoSAA seat matrix: categories, quotas, seat pools — the columns of the matrix in detail.
• JoSAA counselling rounds — how the algorithm runs each round.
• Live JoSAA seat matrix on RankMatrix.
• JEE college & branch predictor — uses category and quota to filter your eligible seats.

Common questions

Which category should I claim in JoSAA?

You claim the category you registered for in JEE Main or JEE Advanced — JoSAA inherits it. If you qualify for OBC-NCL, SC, ST, EWS, or PwD with valid documentation, claiming the reservation gives you both a general-pool offer and a category-pool offer in each round; JoSAA picks whichever is more favourable for you.

What is the difference between OBC and OBC-NCL?

JoSAA only recognises OBC-NCL, the Non-Creamy Layer subset of the central OBC list. If your family income exceeds the limit defined by the Ministry of Social Justice, you fall outside the NCL bracket and must compete in the general pool. The NCL certificate has to be from the current financial year at the time of reporting.

Does EWS reservation also apply to IITs?

Yes. EWS is a central reservation that applies across IITs, NITs, IIITs, and GFTIs in JoSAA. You need a valid EWS certificate issued in the format specified by the Ministry, dated as required by the latest JoSAA business rules — typically issued in the current financial year.

How do female-only supernumerary seats work?

IITs run a supernumerary female pool to improve gender diversity. These seats are over and above the regular seat matrix, allocated only to female candidates, and integrated into the regular seat allocation rounds. NITs, IIITs, and GFTIs do not have an equivalent supernumerary scheme but do report gender-neutral and female-only seat counts in the JoSAA seat matrix.

Can I switch from a category-pool seat to a general-pool seat in a later round?

JoSAA always offers you the best seat your rank qualifies for in each round, considering both general and category pools. You do not switch manually — if your general-pool eligibility for a higher preference opens up in a later round (because of category-pool churn), the algorithm moves you to it automatically.