The bank's P&L: interest earned, NII, and what provisioning conceals

A bank's profit-and-loss account looks, at first, almost reassuringly small. A bank might carry ₹338,000 crore of assets and report just ₹4,500 crore of profit — barely more than one percent of the balance sheet. That is not a sign of weakness; it is the nature of the business. A bank does not earn a fat margin on a small amount of activity. It earns a thin margin on an enormous amount of other people's money, and the whole art of reading its P&L is understanding where that thin margin comes from and, more importantly, which line decides how much of it survives to the bottom. illustrative

That line is provisions. A bank's reported profit is its pre-provision operating profit — the spread it earned, plus fees, minus its running costs — less the amount it sets aside for loans that have gone or are going bad. The first part, the operating profit, is relatively hard to fake: it comes from the spread and the fee income and the costs, all fairly visible. The second part, the provision, is a judgement — management's estimate of future losses — and it is the single most discretionary number in the whole statement. Move it a little and the reported profit moves a lot, in either direction, with no change in the actual business. illustrative

So this module reads the bank P&L for two things at once: how the margin is built, and how much the bottom line has been shaped by the provisioning judgement rather than by the business. The reader who learns to look at pre-provision profit and credit cost, instead of the headline profit alone, can see through the one lever that most often makes a bank's results look better — or, in a clean-up year, worse — than the business underneath.

The previous module read the bank's balance sheet — the loans, the deposits, the buffer. This one reads the profit those assets throw off, and it exists because a bank's P&L is built and gamed in ways a manufacturer's is not. There is no gross margin to anchor on. The top line is interest earned, the real margin is the spread between what the bank earns and what it pays, and the profit is what is left after a provisioning line that management has wide discretion over. Read it with a manufacturer's habits and you will trust a number that was substantially chosen.

Four ideas carry the reading. Net interest income is interest earned minus interest expended — the raw spread, the bank's true top line. Net interest margin expresses that spread against the earning assets, so you can compare banks of different sizes. Pre-provision operating profit is the profit after fees and running costs but before the provisioning judgement — the cleanest measure of the underlying earning power. And credit cost is the provisioning taken, expressed against the loan book, which tells you how much of the operating profit is being consumed by bad loans this year.

Without this module, two errors are almost guaranteed. The first is trusting reported profit growth without asking where it came from — a bank can grow its bottom line by 18% purely by cutting its provisions, while the underlying business stood still and the unrecognised losses quietly grew. The second is misreading a bad year: a bank that takes a large one-off provision to clean its book reports a lower profit precisely because it is getting healthier, and a reader watching only the bottom line sees weakness where there is a clean-up. Pre-provision profit and credit cost, read together, are what separate real profit from the provisioning lever — and that separation is the whole point.

Build the P&L from the spread up, one line at a time.

Interest earned, less interest expended, is net interest income. The bank earns interest on its loans and investments, and pays interest on its deposits and borrowings. The difference is net interest income — the spread, and the bank's real top line. A bank with cheap funding (high CASA — a large share of low- or no-interest current and savings deposits) and disciplined lending earns a wide spread; one paying up for bulk deposits or chasing yield with risky loans earns a narrower or riskier one. Expressed against the earning assets, this spread is the net interest margin, which lets you compare a small bank with a large one.

Add other income, take out operating costs, and you have pre-provision operating profit. Other income — fees, treasury gains, forex — sits on top of the spread. Operating expenses come off. What remains, before any provisioning, is pre-provision operating profit. This is the number to hold onto, because it is the earning power of the business before the most discretionary judgement is applied. Two banks with the same PPOP (pre-provision operating profit) are earning the same operating profit, whatever their reported bottom lines say.

Then provisions land, and that is where the discretion lives. From PPOP, the bank subtracts provisions for bad loans, and what remains is profit before tax. This is the swing line. Provisioning is an estimate of future losses, and management chooses it within a range: provide more, and reported profit falls though the book gets more honest; provide less, and reported profit rises though the losses merely wait. The credit cost — provisions as a percentage of the loan book — tells you how heavy that charge was this year, and comparing it against the trend in slippages — good loans turning bad — and bad loans tells you whether the provisioning was adequate or convenient.

The whole reading reduces to a discipline: never read a bank's profit before tax without reading the pre-provision operating profit above it and the credit cost beside it. PPOP tells you what the business earned; credit cost tells you what the bad loans took; and the gap between "PAT grew" and "PPOP grew" — PAT being profit after tax, the reported bottom line — tells you how much of the reported growth was the provisioning lever rather than the bank.

The spread-and-provision structure is specific to lenders, and setting it beside other businesses shows exactly which parts have no equivalent elsewhere.

The inversion to hold is that a bank's entire profit engine — a spread as the revenue, and a provisioning line as the biggest discretionary charge — simply does not exist for a manufacturer. A manufacturer earns a gross margin on goods and treats interest as a financing cost near the bottom of the P&L. A bank has no gross margin, earns its living on the interest spread itself, and takes its largest judgement-based charge in the provisioning line. The asset-manager cell is included to make a finer point: not everything in the financial sector runs on a spread. An asset manager earns fees with almost no credit risk, so it has no provisioning line to game — a reminder that "financial company" is not one template but several.

Read the composite private bank's P&L in its fifth year, line by line, and then watch what the provisioning line can do. illustrative

Interest earned is ₹22,600 crore; interest expended is ₹12,800 crore; so net interest income — the spread — is ₹9,800 crore, a net interest margin of about 3.9% on earning assets. That margin is healthy because the funding is cheap: nearly half the deposits are CASA. Add other income of ₹3,600 crore, take out operating expenses of ₹6,000 crore, and pre-provision operating profit is ₹7,400 crore. That is the earning power of the business, before a single judgement about bad loans. Then provisions of ₹1,400 crore land, giving profit before tax of ₹6,000 crore and, after tax, ₹4,500 crore. Credit cost — provisions against the loan book — is a modest 0.75%.

Now compare it with the same bank's third year, the credit-stress year. Pre-provision operating profit that year was ₹5,200 crore — the business was still earning. But provisions jumped to ₹2,050 crore as bad loans rose, credit cost spiked to 1.35%, and profit after tax fell to ₹2,360 crore, almost half of the good year. A reader watching only the bottom line would see a business in trouble. A reader watching PPOP would see a business still earning ₹5,200 crore of operating profit and taking its credit pain in one year — a very different, and more accurate, picture. The fall in profit was the provisioning line doing its job, not the business collapsing.

That is exactly where the lever cuts both ways. Suppose instead the bank had wanted the third year to look good. With PPOP of ₹5,200 crore, it could have provided ₹1,000 crore instead of ₹2,050 crore, reported a far higher profit, and left half its credit losses unrecognised in the book. Nothing about the business would have changed — only the judgement. The habit to build is therefore simple and strict: read pre-provision operating profit to see what the bank actually earned, read credit cost against the trend in slippages to judge whether the provisioning was honest, and only then look at the reported profit. When PAT and PPOP move together, the profit is real; when they diverge, the provisioning line is doing the talking.

Build a bank's profit from the spread up. Set the yield on advances and the CASA share — which sets the cost of funds and therefore the spread — and watch net interest income, then pre-provision operating profit, appear. Then move the last slider, the credit cost.

Notice what the credit-cost slider does. As you move it, pre-provision operating profit does not budge — the business earned what it earned — but profit before tax swings sharply. That gap is the provisioning lever in one picture. Slide credit cost down and the bottom line lifts while the losses wait in the book; slide it up and a clean year looks poor. The tool is making the module's single most important point physical: the number most people read, the bottom line, is the number management has the most discretion over, and the cleaner one, PPOP, is sitting one line above it.

Pre-provision operating profit strips out the provisioning discretion, but it cannot tell you whether the spread that produced it is safe or borrowed from risk. A bank can show a wide, stable PPOP by lending aggressively to risky borrowers at high rates — the margin looks great right up until those loans go bad and the credit cost catches up. PPOP is the honest measure of this year's operating earnings; it is not a promise that the spread is durable. To judge that, you have to look at what the bank is lending to and at what yield, which lives in the loan-book disclosures, not in the P&L.

Nor does the credit-cost line tell you whether the provisioning is adequate, only what was taken. A low credit cost is reassuring if bad loans are genuinely low and falling, and alarming if slippages are rising while the bank provides less anyway. The number on its own is neutral; its meaning comes entirely from the trend it sits against — slippages, the restructured book, the coverage ratio from the balance sheet. Reading credit cost without those cross-checks is how a deliberately light provision passes as a sign of strength.

And the P&L cannot, by itself, catch a bank that is avoiding recognition rather than under-providing against recognised loans. Provisioning discretion is the visible lever; the invisible one is not classifying a loan as bad in the first place — evergreening it, restructuring it, keeping it standard. A bank doing that shows a clean credit cost and a healthy PPOP because the losses have not entered the numbers at all. The P&L reads the loans the bank has admitted are troubled; the ones it is quietly carrying at par are a balance-sheet and disclosure question, and they are where the largest failures hide.

How it comes up. When reported profit jumps, a sharp analyst checks whether the business grew or the provisioning line was relaxed. The question sounds like this: "PAT grew 18% but PPOP was roughly flat and credit cost came down 60 basis points. How much of the profit growth is operating, and is the lower provisioning a genuine improvement in asset quality or a normalisation you can't repeat?" The analyst is separating the business from the lever.

A good answer, verbatim-style.

"Honest answer: most of the PAT growth this year is lower credit cost, not PPOP. Operating profit was up about 3%; the rest is provisioning normalising from last year's stressed 1.35% back to 0.75%, which reflects genuine recoveries and lower slippage — our gross NPA fell and coverage actually rose to 78%. But you're right that this is a normalisation, not a repeatable engine. Next year we'd guide credit cost around 0.75% and PAT growth tracking PPOP, which we expect in low double digits. So don't extrapolate this year's headline."

It concedes the headline was provisioning-led, shows the asset-quality improvement was real (coverage up, not down), and warns against extrapolating. It hands you the operating number and the caveat.

An evasive answer, verbatim-style.

"We're very pleased with our 18% profit growth, which reflects the strength of our franchise and disciplined execution across the board. Asset quality continues to improve and our provisioning is prudent and adequate. We remain confident in delivering healthy, sustainable profit growth going forward."

It claims the 18% as franchise strength while never mentioning that PPOP was flat and the growth was provisioning. "Provisioning is prudent and adequate" is asserted, not shown against coverage or slippage. "Sustainable growth" implies the 18% is repeatable when it plainly is not. A listener who takes it at face value extrapolates a one-off release into a trend.

The follow-up nobody asks. "Excluding the change in credit cost, what was PAT growth, and what credit cost are you guiding for next year?" That forces the headline back to the operating number and a forward provisioning assumption. Watch what happens when it is not asked. If "18% growth, strong franchise" is allowed to stand, investors capitalise a provisioning normalisation as if it were earning power. The silence is the tell — either PPOP growth is embarrassingly low, or the coverage and slippage trend behind the lower credit cost would not survive the question.

The first trap is reading a bank's profit growth without reading the pre-provision profit above it. A rising bottom line feels like a stronger bank, but a bank can grow reported profit by simply providing less against its bad loans, with the underlying business standing still. PPOP is the check: if reported profit grew and PPOP did not, the growth came from the provisioning line, and the unrecognised losses are still in the book waiting to land. The headline that most people read is the one most exposed to the lever.

The second trap is treating two identical net interest margins as equally good. The same 3.5% spread can be earned on cheap deposits and prime loans, or squeezed out of expensive funding and risky lending. The first is durable; the second carries credit cost that will eat the margin when the cycle turns. NIM (net interest margin) tells you the size of the spread, not how safely it was earned, and a high margin from risky lending is a warning dressed as a strength — the yield is high precisely because the risk is.

The third trap is misreading a clean-up year as a bad year. When a bank takes a large one-off provision to recognise its problems in one go — a "kitchen-sink" quarter — reported profit drops sharply, and a reader watching the bottom line sees deterioration. But if PPOP held or rose and the provision was a one-time recognition, the bank is getting healthier, not weaker: it is clearing the book. The mirror of under-provisioning to flatter a good year is over-providing to clean a bad one, and both are invisible unless you read PPOP and credit cost instead of the profit line alone. The bottom line is where the provisioning judgement lands; the truth about the business is one line above it.