State Bank of India (SBI) reported Q1 FY27 net profit of ₹21,121 crore, up 10.2% year-on-year, while net interest income (NII) surged 14.88% to ₹46,992 crore — yet its domestic net interest margin (NIM) of 3% was marginally lower than the 3.01% posted in the same quarter last year.
Profit up 10%. Revenue up 15%. Stock up 3.5% on the day. Looks like a clean win, right?
Here is how a CFO reads it differently.
For a bank, NII — Net Interest Income — is the rough equivalent of gross profit. It is the spread between what the bank earns on loans (₹46,992 crore this quarter) and what it pays on deposits. NIM, Net Interest Margin, is that spread expressed as a percentage of earning assets. Think of it as a bank's gross margin.
SBI's NIM this quarter: 3%. Same quarter last year: 3.01%. Seven basis points better than the previous quarter, but still below year-ago levels. Meanwhile, advances grew 18.6% — a massive loan book expansion. So the bank is writing far more loans, but earning a slightly thinner margin on each rupee lent. Volume is masking a quiet margin squeeze.
A CFO would ask: if NII grew 15% but PAT only grew 10%, where did the difference go? Part of the answer is provisions and operating costs absorbing the rest. The ratio that matters here is not just profit growth — it is whether margin is expanding or compressing as the business scales.
This is the ratio analysis mindset. Growth numbers headline. Margin ratios tell the real story. SBI is India's largest lender — when its NIM moves even 5 basis points, it moves thousands of crores. Watch the margin, not just the number.
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