How Many CSAB Rounds Are There in 2026?
The short answer: CSAB typically runs two special rounds each year, held after all JoSAA rounds are complete. These two rounds are your last centralised chance to secure or upgrade a seat in the NIT+ system — 31 NITs, 26 IIITs, and around 45 GFTIs — for the 2026 academic year. The official schedule is now out: registration runs 28 July – 3 August 2026, Round 1 allotment is on 6 August, and Round 2 allotment on 12 August 2026. Here is everything you need to know about why there are only two, what each one does, and how to play them strategically.
The Direct Answer: Two Special Rounds
CSAB usually conducts two special rounds of counselling each year. Unlike JoSAA, which runs approximately five to six rounds across several weeks, CSAB operates on a much tighter timeline because it is only filling the seats that remain vacant once JoSAA is fully done. The smaller pool of leftover seats means two rounds are generally enough to clear most of the vacancy.
Always confirm the exact count for 2026 on the official portal at csab.nic.in once the schedule is published, as the authority does have the discretion to add or modify rounds.
CSAB Rounds vs JoSAA Rounds: What Is the Difference?
| Feature | JoSAA (~5–6 rounds) | CSAB (~2 special rounds) |
|---|---|---|
| Institutes covered | IITs + NIT+ system (NITs, IIITs, GFTIs) | NIT+ system only (NITs, IIITs, GFTIs) |
| When it happens | Starts shortly after JEE results (typically June–July) | Starts only after JoSAA's final round (in 2026: 28 July – 18 August) |
| Seats available | Full original seat matrix | Only seats left vacant after JoSAA |
| Registration | Fresh registration on josaa.nic.in | Separate fresh registration on csab.nic.in |
| Number of rounds | Typically 5–6 (including mock rounds) | Typically 2 special rounds |
Why Only Two Rounds?
JoSAA needs multiple rounds because it starts with a large seat matrix covering both IITs and the NIT+ system, and thousands of candidates are simultaneously trying to upgrade, slide, or float to better options. The process requires multiple iterations for the allocation to settle.
By the time CSAB begins, the landscape is very different. The seats available are specifically those that remained unfilled — typically because the original allottees withdrew, did not report, or paid the fee but left for other admissions (state-level counselling, private colleges, etc.). This residual pool is much smaller and more specific, so two rounds are usually sufficient to fill most of the remaining vacancies.
What Happens in CSAB Round 1?
After fresh registration on csab.nic.in, candidates fill a new choice list of the vacant institute-branch combinations they would accept. The CSAB algorithm then runs the allotment using your JEE Main 2026 rank. If you receive a seat in Round 1, you can:
- Accept and report — lock in the allotted seat and complete document verification.
- Accept and wait for Round 2 — hold the current seat while the system tries to improve it in Round 2 (similar to the "float" concept in JoSAA, but check CSAB rules carefully each year).
- Reject — decline the seat, but this may affect your eligibility for Round 2 depending on CSAB's current rules.
What Happens in CSAB Round 2?
Round 2 is the final round of the NIT+ system for the 2026 cycle. Remaining vacancies from Round 1 (seats not accepted or newly opened because of withdrawals) are re-allotted. Candidates who received a seat in Round 1 but chose to wait for an upgrade will be considered for a better allotment if one matches their updated choices.
After Round 2 concludes, any seats that remain vacant are no longer part of centralised counselling for the current academic year. Institutes may handle these through their own institutional-level processes.
Upgrade Chances Between CSAB Rounds
The upgrade opportunity between CSAB's two rounds is real but limited compared to JoSAA's longer float window, simply because the total number of rounds is smaller. Your upgrade probability depends on:
- How many candidates with seats better than yours choose not to accept, creating new vacancies.
- Whether the branches or colleges you have listed higher in your choice list actually have vacancies after Round 1.
- Your rank relative to other CSAB participants — the same merit-based algorithm applies here as in JoSAA.
For a fuller picture of how CSAB's schedule fits together, see our guide on the CSAB Special Rounds 2026 schedule and dates. And if you are still unclear on what "special rounds" actually means in the context of the wider JoSAA–CSAB process, read our explainer on what is a special round in JoSAA/CSAB.
Should You Register for CSAB?
If your JoSAA allotment is not what you hoped for — or if you did not receive any JoSAA seat — CSAB's two special rounds are absolutely worth registering for. The registration fee is relatively modest, and the upside of landing a better NIT or IIIT seat is significant. The main thing to assess is whether the effort and risk (particularly if you hold a JoSAA seat you are reluctant to give up) are worth the potential reward.
Not Sure Whether CSAB Is Worth It for You?
We check live vacant-seat data against your specific rank and category, so you know before you register whether there are realistic options in either special round.
Get a Free CSAB Assessment →How Many CSAB Rounds 2026 — FAQs
How many CSAB special rounds are there in 2026?
CSAB 2026 has two special rounds, per the official schedule now published on csab.nic.in. Registration runs 28 July – 3 August 2026, with Round 1 allotment on 6 August and Round 2 allotment on 12 August 2026.
How many rounds does JoSAA have compared to CSAB?
JoSAA generally runs around five to six rounds spread over several weeks, covering both IITs and the NIT+ system. CSAB then follows with typically two special rounds focused only on NIT+ vacant seats.
Can I participate in both CSAB Round 1 and Round 2?
Yes. You register once for CSAB and are eligible for both special rounds. If you receive a seat in Round 1 and do not accept it, you remain in the pool for Round 2, though the available seats may be different.
Why does CSAB only run two rounds instead of five or six like JoSAA?
CSAB operates on a compressed timeline because it only fills seats left vacant after JoSAA. The pool of available seats is smaller and more specific, so two rounds are generally sufficient to clear the remaining vacancies.
Can I upgrade my seat between CSAB Round 1 and Round 2?
CSAB typically allows you to update your choice list between rounds so the system can attempt an upgrade in Round 2. Check the official csab.nic.in instructions each year, as the exact upgrade mechanism can vary.
What happens after CSAB Round 2 if seats are still vacant?
After CSAB Special Round 2, any seats that remain unfilled are generally reported to the institutes directly for their own institutional-level processes. There is no further central counselling for NIT+ seats in that academic year.