IIT Madras BS Through IAT vs the Online BS: Two Different Programmes

"IIT Madras BS through IAT" is not the online IITM BS. IIT Madras uses the IISER Aptitude Test (IAT) to admit students to two campus programmes: B.S. (Medical Sciences & Engineering) and B.S. (Chemistry). The online BS programmes in Data Science, Electronic Systems, Aeronautics and Space Technology, and Management and Data Science do not use IAT at all. You get into those through the IIT Madras qualifier, or directly if you were eligible for JEE Advanced.

Both have "BS" in the name and both come from IIT Madras, so the mix-up is easy. Almost everything else is different.

IAT campus BS vs online BS at a glance

The DS fee is for general category students joining Foundation from January 2026, before any waiver.

What the IAT route actually is

The IAT-2026 brochure, dated 1 April 2026, sets these rules:

• Three conditions, all at once. You must qualify in IAT 2026. You must be an Indian national, or an OCI or PIO card holder whose card was issued before 4 March 2021. You must have passed Class 12 in the science stream in 2024, 2025 or 2026, from a board recognised by COBSE.
• Subjects. Medical Sciences & Engineering needs Mathematics plus two of Biology, Chemistry and Physics. Chemistry needs Chemistry plus two of Biology, Mathematics and Physics.
• Marks. At least 60% aggregate in Class 12, or 55% for SC, ST and PwD candidates.
• Offers. IIT Madras makes offers on its own portal, based on your IAT rank, your category and the seats left in that round. There are up to 4 rounds.
• Fees. The application fee is Rs 1,000, or Rs 500 for SC, ST, PwD, third gender and female candidates. After an offer, you pay a seat acceptance fee of Rs 30,000 (Rs 15,000 for SC, ST and PwD). Tuition and hostel fees follow the BTech fee structure.

For 2026, registration ran from 6 April to 5 June 2026, and classes began on 30 July 2026. The 2026 IAT admission is over, so watch the same portal for the next cycle.

Seats in each programme

The brochure's seat matrix lists 36 seats in Medical Sciences & Engineering and 50 in Chemistry, split by category, with some seats for women only. Each programme also has 6 extra seats: 2 each for sports excellence, fine arts and culture excellence, and science olympiad excellence.

What about the cut-off?

The brochure does not publish closing ranks, and offers depend on rank, category and the seats left in each round. We do not repeat cut-offs from coaching sites.

How the online BS works instead

The online BS is what IIT Madras calls its non-campus BS. Content is online, and quizzes and exams happen in person at centres in India and abroad. To join:

1. Apply on the programme website and pay the application fee (Rs 4,000 for general category).
2. Study 4 weeks of content in 4 courses and submit the weekly assignments.
3. If your assignment scores are high enough, write the in-person qualifier exam.
4. Everyone who crosses the cut-offs qualifies. There is no rank list.

If you were eligible to appear for JEE Advanced, you can skip the qualifier and start the Foundation level. See direct entry through JEE and the full admission process. For the September 2026 cycle, applications close on 27 September 2026, and the ES, AE and MG pages list the qualifier exam on 15 November 2026.

For the campus access online students get, see the online BS vs IIT Madras campus programmes. The IIT Madras Zanzibar BS is a third, separate programme: see online BS vs IIT Madras Zanzibar.

Which one fits you?

• The IAT route suits you if you finished Class 12 science recently with the required marks, want full-time campus life, and want chemistry or medical sciences.
• The online BS suits you if you want to study from home, are already in another college, are working, or passed Class 12 years ago.

Common questions

Does an IAT score give admission to the online BS in Data Science?

No. The online BS does not use IAT scores. You need to pass the IIT Madras qualifier, or show JEE Advanced eligibility for direct entry to the Foundation level.

Is B.S. Medical Sciences & Engineering the same as MBBS?

No. The brochure describes a Bachelor of Science programme that links medicine and engineering and includes a hospital internship. It does not describe it as an MBBS or a licence to practise. Ask bsadm@iitm.ac.in (opens in a new tab) if that matters to you.

I am already in the online DS programme. Can I also join the campus B.S. Chemistry?

The ES and AE FAQs say yes to one offline and one online degree together. The IAT brochure does not discuss it, so ask the UG admissions office before you accept a seat. Online BS exam dates are fixed, so plan for clashes.

Does B.S. Chemistry lead to an M.S.?

The brochure says B.S. (Chemistry) is a 4-year programme with an upgrade option to an M.S. in Chemistry. It started in the 2024-25 academic year.