Banking Sector — NIM, Asset Quality, and Regulation
Learning Objectives
After reading this chapter, you will be able to:
- Explain how banks: deposits → loans → spread (NIM)
- Apply: CASA = competitive funding advantage
- Apply: NPAs = primary risk; CAR = loss absorption buffer
- Compare: Private vs PSU trade-offs on efficiency, NPA, valuation
Introduction
Economy = body; banks = circulatory system. Healthy banks → business growth, housing, jobs. Weak banks → systemic crisis (2008 global example).
Banking analysis = understanding entire economy's pulse, not just one industry.
Core Concepts
Financial Terms
| Metric | Meaning |
|---|---|
| NIM | Net Interest Margin — spread on earning assets |
| CASA | Current + Savings Account deposits (cheap funding) |
| GNPA | Gross Non-Performing Assets / Gross Advances |
| NNPA | Net NPAs after provisions / Net Advances |
| PCR | Provision Coverage Ratio = Provisions / Gross NPAs |
| CAR | Capital Adequacy Ratio = Capital / Risk-Weighted Assets |
| Credit Growth | Loan book expansion rate |
| ROA / ROE | Profitability on assets / equity |
Investment Decision
Consider Buying When
✅ Strong CASA ✅ Low and improving NPAs ✅ ROA > 1% ✅ Stable credit growth ✅ Strong capital adequacy
Exercise Caution When
❌ Rising GNPA ❌ Low PCR ❌ Unsustainable loan growth ❌ Insufficient capital buffer
Core thesis: Banking = asset quality business, not just earnings growth.
Disclaimer: Banking stocks sensitive to RBI policy, credit cycles, and macro conditions.
"Banks are to an economy what blood vessels are to the human body."
Formula & Explanation
How Banks Earn
Example: 10% loans, 5% deposits → 5% spread
NIM
Example: Interest earned ₹1,000 cr, paid ₹600 cr → NII ₹400 cr
CASA Ratio
Example: CASA ₹450 cr / Total ₹1,000 cr = 45%
GNPA
Example: ₹300 cr bad / ₹10,000 cr loans = 3%
NNPA
PCR
CAR
Benchmark Reference Levels
| Metric | Good Level |
|---|---|
| CASA | > 40% |
| GNPA | < 3% |
| NNPA | < 1% |
| PCR | > 70% |
| CAR | > 15% |
| ROA | > 1% |
Visual Guide
Worked Example — Indian Market
Deep Walkthrough: Bank Comparison
| Metric | Private A | PSU B |
|---|---|---|
| NIM | 3.8% | 2.9% |
| GNPA | 1.2% | 4.5% |
| ROA | 1.9% | 0.8% |
| P/E | 18x | 6x |
PSU B looks cheap at 6x P/E but GNPA 4.5%, ROA 0.8% = credit cycle risk. Use ROA + asset quality, not P/E alone.
Real World Example
| Bank A | Bank B | |
|---|---|---|
| CASA | 45% | 20% |
| GNPA | 1% | 8% |
| CAR | 18% | 10% |
Same reported profit. Recession hits:
- Bank A strengthens
- Bank B raises capital dilutively
In banking, Asset Quality + Risk Management > headline profit
Case Study
Private Banks
HDFC Bank, ICICI Bank, Kotak Mahindra Bank — typically higher CASA, better efficiency, lower NPAs vs historical PSU average.
PSU Banks
State Bank of India (SBI), Bank of Baroda — larger scale, government backing; asset quality cycles matter more.
| Private | PSU | |
|---|---|---|
| Efficiency | Higher | Moderate |
| CASA | Higher | Moderate |
| NPA | Generally lower | Relatively higher |
| Growth | Faster | Moderate |
| Valuation | Higher | Lower |
Interest rate cycle: Rising rates → NIM pressure initially; falling rates → credit demand boost (with lag).
CFA Exam Tip
Senior CFA banking checklist:
- Credit growth — quality or reckless?
- CASA trend — stable or declining?
- GNPA/NNPA direction — improving or deteriorating?
- PCR adequate?
- ROA/ROE vs peers?
High NIM can signal risky lending if accompanied by rising NPAs.
Bad loans destroy good banks. Best bank = safest loans, not most loans.
Common Mistakes
❌ Rapidly rising NPAs ❌ Low provision coverage ❌ Declining CASA ❌ Excessive corporate concentration ❌ Repeated capital raises (dilution) ❌ Weak underwriting / aggressive loan growth
Key Takeaways
- Banks: deposits → loans → spread (NIM)
- CASA = competitive funding advantage
- NPAs = primary risk; CAR = loss absorption buffer
- Private vs PSU trade-offs on efficiency, NPA, valuation
- Analyze quality before growth
Practice Questions
Chapter: Banking Sector | Part 11 | Try before reading answers.
Q1 (Conceptual): Banking Sector — what is the core message of this chapter in one sentence?
Q2 (Calculate): Calculate: Example: 10% loans, 5% deposits?
Q3 (Application): Scenario: Example: CASA ₹450 cr / Total ₹1,000 cr = 45% — what does it imply?
Q4 (Red Flag): Red flag: ❌ Rapidly rising NPAs — why avoid relying on Banking Sector alone?
Q5 (CFA Style): CFA-style trap when interpreting Banking Sector?
Q6 (Decision): Banking Sector looks strong but valuation stretched — invest, wait, or avoid?
Q7 (Lab): Complete one Banking Sector exercise in Part 11 Practice Lab.
Answer Key
Q1 (Conceptual)
Banks: deposits → loans → spread (NIM)
Q2 (Calculate)
5% spread
Q3 (Application)
45%
Q4 (Red Flag)
❌ Rapidly rising NPAs — triangulate with cash flow and balance sheet.
Q5 (CFA Style)
Senior CFA banking checklist:
Q6 (Decision)
Usually wait for MOS unless quality exceptional. Also: CASA = competitive funding advantage
Q7 (Lab)
Open Part 11 Practice Lab → use the FAQ Drill row for banking-sector; verify answers in the Chapter FAQ Quick Index.
Go deeper: Part 11 Practice Lab
FAQ {#faq}
Q: Banking Sector — what is the second check when evaluating this concept?
A: ❌ Low provision coverage
Q: How do you connect theory with Indian market practice for Banking Sector?
A: Pull the same metric's 3-year trend from Screener/Trendlyne plus the company annual report — a paper formula alone is not sufficient.
Q: banking-sector — why should you avoid this mistake?
A: ❌ Rapidly rising NPAs
Q: banking-sector — ❌ Declining CASA red flag — why avoid it?
A: ❌ Declining CASA
Q: How do I drill this chapter's concepts in the Practice Lab?
A: Open Part 11 Practice Lab → use the FAQ Drill row for banking-sector; verify answers in the Chapter FAQ Quick Index.
Practice Lab FAQ: Full part FAQ index — Part 11 Practice Lab
Related Topics
- Previous Chapter: 77-Sector Analysis Intro
- Next Chapter: 79-Defence Sector
- Part Overview: Part 11 Sector Analysis
- Book Index: Full Table of Contents
Disclaimer: Educational content only. Not investment advice. Consult a qualified financial advisor before investing.