IIM (Indian Institutes of Management) and ISB (Indian School of Business) are India's two most prestigious business school brands. Both open doors to top consulting, finance, and corporate careers, but they are fundamentally different programmes. This guide gives you a direct comparison.
Key Differences at a Glance
| Feature | IIM (Ahmedabad/Bangalore/Calcutta) | ISB |
|---|---|---|
| Admissions test | CAT (no GMAT/GRE) | GMAT (no CAT) |
| Work experience required | Not required | 2-15 years recommended |
| Duration | 2 years | 1 year |
| Class size | ~400 per school | ~900 per year |
| Fees | ₹23-₹26 lakh | ₹42 lakh |
| Global ranking | Asia top 5 | Global top 30 (FT) |
| International recognition | Strong in Asia | Stronger globally |
| TOEFL/IELTS | Not required (Indian nationals) | Not required (Indian nationals) |
| Placement | Excellent (India + some global) | Excellent (India + global) |
| Target career stage | Early career (0-3 years) | Mid-career (4-10 years) |
Admissions: CAT vs GMAT
| IIM | ISB | |
|---|---|---|
| Test | CAT (Computer Adaptive Test) | GMAT |
| Format | Verbal, Quant, DILR | Verbal, Quant, Data Insights |
| Score used | Percentile (99+ for IIMA/B/C) | ~730 average |
| Interview | WAT-PI process | Video essay + interview |
| International applicants | Can apply; may need GMAT | Standard (GMAT required) |
| IELTS/TOEFL | Not required for Indian nationals | Not required for Indian nationals |
For international students applying to ISB: GMAT is required. IELTS/TOEFL are not formally required for most international nationalities, but English proficiency may be evaluated through the interview.
Fees Comparison
| IIM A/B/C | ISB | |
|---|---|---|
| Programme fee | ₹23-₹26 lakh | ₹42 lakh |
| Living costs (2 yr vs 1 yr) | ₹8-₹12 lakh (2 yr) | ₹5-₹7 lakh (1 yr) |
| Opportunity cost | 2 years salary | 1 year salary |
| Total economic cost | ₹70-₹90 lakh | ₹80-₹100 lakh (comparable due to 1 yr) |
Despite ISB's higher sticker price, the 1-year duration makes the total economic cost comparable to or lower than IIM.
Placements Comparison
IIM ABC Median Packages (2026 Estimated)
| School | Domestic Median (₹ lakh) | International % |
|---|---|---|
| IIM Ahmedabad | ₹30-₹35 | ~15-20% |
| IIM Bangalore | ₹28-₹33 | ~15-20% |
| IIM Calcutta | ₹25-₹30 | ~10-15% |
ISB Median Packages
| Domestic | International | |
|---|---|---|
| ISB | ₹32-₹38 lakh | ~25-30% of class |
ISB's slightly higher median domestic package and stronger global placement reflect its GMAT-filtered, experienced cohort.
Global Recognition
| Scenario | IIM | ISB |
|---|---|---|
| Working at McKinsey/BCG/Bain India | Equal | Equal |
| Working at Goldman Sachs India | Equal | Slight ISB advantage |
| Applying for US MBA later | Limited credit given | Limited (different credential type) |
| Working in Singapore/London | ISB more recognised | - |
| Academic credibility | Very high | Strong |
ISB's FT ranking and AACSB accreditation give it stronger global recognition than IIM for international employers who may not know the IIM system.
Who Should Choose IIM (ABC)?
- You are a fresh graduate or have 0-3 years experience
- You are taking CAT (or are willing to, CAT is required)
- You want the most prestigious Indian brand domestically
- You value the 2-year programme's alumni network depth and breadth
- Your career goal is India-focused consulting, banking, or corporate leadership
Who Should Choose ISB?
- You have 4+ years of work experience and want a mid-career accelerator
- You want a 1-year programme (lower opportunity cost)
- Your career goals include international placement or global exposure
- You have or are willing to take the GMAT
- You want the most globally recognised Indian business school credential
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