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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