CSAB 2026 Eligibility Criteria – Category-wise Rules & Who Is NOT Eligible

CSAB 2026 eligibility is built on the same JEE Main 2026 foundation as JoSAA, but the category-specific requirements determine whether your particular rank, certificate, and academic record actually qualify you for a seat. The table below breaks down the exact requirement per category rather than treating eligibility as one uniform rule.

For the full list of documents you need to prove these certificates, see our CSAB document checklist.

• Candidates already settled in JoSAA: If you accepted a JoSAA seat, paid fees, and completed physical reporting (Final/Freeze status) without withdrawing, you cannot simultaneously hold a CSAB seat. You must officially withdraw from JoSAA first.
• Foreign nationals, NRIs, and OCI candidates: CSAB 2026 is exclusively for Indian nationals competing on the JEE Main CRL/category merit list. Foreign nationals and NRIs should apply through the DASA scheme administered separately by NIT Trichy.
• Candidates without a valid JEE Main 2026 qualification: Simply appearing for JEE Main is not enough — you must have a valid, qualifying CRL or category rank as per NTA's published cutoff percentile for 2026.
• Candidates with lapsed or invalid category certificates: An expired OBC-NCL/EWS certificate, or one issued in the wrong (state-list) format, effectively disqualifies a candidate from claiming that category's relaxed eligibility — though they may still be considered under General category if their rank qualifies there.
• Candidates below the Class 12 percentage/percentile threshold: Falling short of 75%/65% aggregate AND the top-20-percentile alternative makes a candidate ineligible for admission to NITs/IIITs/GFTIs regardless of JEE Main rank.

NITs reserve 50% of seats for Home State (HS) candidates and 50% for Other State (OS) candidates. Your HS/OS classification is based on where you completed Class 12 — not your domicile certificate or birthplace — and this classification carries over unchanged from your original JoSAA registration into CSAB. A common misconception is that candidates can re-declare their home state when registering fresh for CSAB; in practice the classification locked in during JEE Main/JoSAA registration is what CSAB uses.

A second nuance applies to candidates from Union Territories without a NIT (e.g., Chandigarh, Puducherry residents who passed Class 12 elsewhere) — these cases are handled under specific pool rules defined in the CSAB information bulletin, and candidates should verify their exact HS/OS mapping rather than assume it based on general state rules.

For a general overview of who can apply, see our CSAB 2026 eligibility overview — this page goes deeper into category-wise rules, Class 12 thresholds, and exclusions that the overview page does not cover in detail.