---
title: HDFC Bank — An Experiment With a Hundred Rupees
symbol: HDFCBANK
company: HDFC Bank Ltd.
sector: Financial Services
moat: wide
date: 2026-07-07
verdict: A trust machine with a three-decade habit of refusing bad loans; the moat is the depositor's sleep.
---

# HDFC Bank: An Experiment With a Hundred Rupees

## Try this at home

Here is an experiment that needs no laboratory, only a pencil.

Suppose you have ₹100 of your own. You persuade your neighbours to leave
₹900 with you for safekeeping, promising them 4% a year for the privilege.
You now control ₹1,000. You lend that ₹1,000 to careful borrowers at 9%.

Run the numbers. You earn ₹90 in interest. You pay your neighbours ₹36. You
spend, say, ₹30 running the operation — staff, branches, computers. That
leaves ₹24 of profit. On *your* ₹100, that is a 24% return, conjured from a
5% gap between two interest rates. This trick — earning a small spread on a
large pile of other people's money — is the entire science of banking. There
is no reactor, no furnace, no molecule. A bank is arithmetic wearing a
marble facade.

But now run the experiment the other way, as a physicist would, to find
where it explodes. You lent ₹1,000. Only ₹100 of it was yours. If just ₹100
of your loans — one rupee in ten — is never repaid, your entire capital is
gone. Your neighbours' money is now at risk, and the moment they sense it,
they will all ask for their ₹900 back on the same morning. No bank on Earth,
however honest, holds enough cash to survive that morning: the money is out
working in loans. This is the second law of banking: **leverage magnifies
both the spread and the mistake.** A bank borrowing nine rupees for each of
its own can be destroyed by errors that a normal business would barely
notice.

So the whole game reduces to two questions. Can you gather other people's
money more cheaply than rivals? And can you say *no* to bad borrowers, year
after year, especially in the years when saying yes looks brilliant? The
first is a contest of trust. The second is a contest of temperament.
Everything else — the apps, the towers, the acronyms — is decoration.

## Why society rents out its savings

Step back and ask why this arrangement exists at all. In any economy,
millions of families hold small pools of idle money, and elsewhere a
businesswoman needs ₹2 crore to build a workshop. Neither can find the
other; neither can judge the other. The bank stands in between and performs
three services at once. It *pools* — a lakh here, ten thousand there,
assembled into lendable crores. It *transforms time* — your deposit is
withdrawable tomorrow, yet the workshop loan runs seven years; the bank
bridges that mismatch by relying on the statistical fact that all depositors
never leave at once (until, rarely and catastrophically, they do). And it
*judges* — it maintains the machinery for the hardest question in commerce:
who will actually pay this money back?

Society pays a spread for these three services because the alternative —
every saver vetting every borrower — is impossibly wasteful. Now, where in
this value chain does the profit settle? Not in lending. Lending is the
commodity end: any bank, and lately any app, can push a loan out the door;
in boom years, competitors will always underprice you. The durable profit
sits at the *gathering* end — in deposits, and specifically in cheap ones.
A family that keeps its salary account, its emergency money, its daughter's
wedding fund in your savings account — paying you the lowest rate in the
system simply because it trusts you — hands the bank its raw material at a
discount no competitor can match with advertising. In banking, the moat is
never the loan book. The moat is the depositor's sleep.

## From goldsmiths' receipts to a licence in Bombay

Banking is one of humanity's oldest information businesses. European
goldsmiths discovered centuries ago that receipts for stored gold circulated
as money, and that they could issue a few more receipts than they had gold —
fractional banking was born, along with its eternal companion, the bank run.
Every refinement since — central banks, deposit insurance, capital rules —
is civilisation's attempt to keep the ₹100-experiment from exploding.

India's chapter has its own plot. For decades after 1969, banking here was
overwhelmingly state-owned: a vast machine for gathering deposits, directed
by policy, indifferent to profit. When the economy liberalised in 1991, the
regulator did something quietly momentous: it issued a handful of fresh
private banking licences. One went to a housing-finance institution named
HDFC, whose banking offspring opened its doors in Mumbai in 1994.

The newcomer's opportunity was almost embarrassing: its state-owned rivals
held the nation's deposits but often made customers queue for an afternoon
to withdraw them, and their loan books periodically drowned in directed
lending. A bank that simply answered the phone, computerised early, and
refused imprudent loans could compound for decades. That is, with very
little exaggeration, the strategy. Three decades later the offspring
absorbed its own parent — the 2023 merger that folded HDFC the home-lender
into HDFC Bank — creating the giant whose numbers we will meet shortly, and
it did so with a distinction almost unique among Indian giants: **it has no
promoter at all.** No family owns it. Institutions and 45 lakh ordinary
shareholders do, and professional managers run it under the regulator's
gaze.

## You cannot buy a deposit franchise

What would it cost a rival to build this? The honest answer: money is not
the binding constraint, which is precisely the point.

A licence takes years and the regulator's confidence. Branches — thousands
of them, reaching towns where a bank's signboard is a civic event — take a
decade to build and another to become profitable. But the true barrier is
slower still. A deposit franchise is assembled one household at a time, and
the household's decision is not analytical; it is the question *"will my
money be there?"* answered by thirty years of nothing going wrong.
Technology, oddly, has made the lending side easier to enter — an app can
disburse a personal loan in minutes — while barely denting the gathering
side: the same customer who borrows from an app still parks her savings
with a bank she trusts. New private banks have appeared in India since
1994; the number that have built a low-cost deposit base of this scale can
be counted on one hand, with fingers to spare. Scale here is not a factory
you can order. It is accumulated reputation, and reputation obeys the old
rule: built in decades, destroyed in an afternoon.

## The question Charlie would ask: how do bankers go mad?

Reason about this business the way Charlie Munger reasoned — begin with
incentives, and invert.

Banking has the most dangerous incentive structure in commerce. A banker
who lends recklessly books profits *today*; the losses arrive years later,
often after the bonuses are spent. Growth is applauded in the exact seasons
when it should be feared. So the first thing to examine in any bank is not
its growth but its *refusals* — and here the record is the story. Through
India's corporate lending binge of the early 2010s, through the infra-loan
hangover that crippled rivals, this bank's bad loans stayed strangely,
almost boringly, small. That is not luck repeated for thirty years; it is
culture — an institutional habit of saying no, which Munger would call the
rarest asset in finance because it must be re-earned every single morning
and cannot be copied by hiring away your competitor's staff.

Then invert: what kills great banks? Never a shortage of ambition — always
an excess. They die by growing into what they don't understand, by
funding long loans with flighty money, by letting the credit department
report to the sales department. Note that the merger raises exactly this
family of questions, in respectable form: the bank swallowed an enormous
book of long home loans that had been funded, in its parent, by borrowings
rather than sticky deposits. The task of this decade is to re-fund that
book with its own cheap deposits — millions of new accounts, patiently
gathered. The arithmetic of the ₹100 experiment says this is the highest-
value work its managers can do, dull as it sounds.

Opportunity cost, finally. The decade's return on equity averaged 16%; last
year, digesting the merger, 13.8%. A conservatively run bank compounding
owners' money in the mid-teens, in a country where credit itself grows with
national income, with optionality bolted on (broking, insurance, mutual-
fund arms) — Munger's framework does not require that to be exciting. It
requires it to be *repeatable*.

## Buying the whole bank

Now Warren Buffett's exercise: buy it all. Every share would cost about
₹12.78 lakh crore. What do you get?

Last year's profit of ₹79,219 crore — roughly a 6% starting yield, since the
market asks about 16.8 times earnings (₹16.80 today for each rupee of
current annual profit). You pay about 2.2 times book value — ₹830 per share
against ₹378 of accumulated net worth — which is the premium the market
charges for that deposit culture; book value matters in banking because the
book *is* the business: a pile of loans minus a pile of deposits, with trust
in between.

The compounding record is the argument. Profit has grown 20% a year for ten
years — ₹10,703 crore then, ₹79,219 crore now. Earnings per share went from
₹10.66 to ₹49.39 across the same stretch — nearly five-fold — and that
figure quietly absorbs all the new shares issued for the merger, which is
what a shareholder should actually care about. The dividend has climbed from
under a fifth of profit to 31% last year. And ownership has been changing
hands in an instructive direction: foreign institutions sold down from 52%
to 42% in three years while domestic institutions rose from 30% to 42% —
India, in effect, buying its own largest private bank back from the world,
while the shareholder count swelled from 31 lakh to 45 lakh.

Predictability? A bank is a slice of everything — every EMI, every salary
account, every workshop loan — so its fortunes track the country's, smoothed
by conservatism. Pricing power lives, as ever, on the deposit side. The
open question an owner must watch is return on equity: history says 16%,
the merger says 13.8% for now. Whether it climbs back as the home-loan book
gets re-funded with cheap deposits is the single number that will decide
how fast this compounds for the next decade. The moat itself — the
gathering machine, the refusing culture, the absence of any promoter with a
side agenda — earns the rating **wide**.

## What could break it

Structural threats only; a bank this size has no interesting small problems.

- **A credit cycle it fails to refuse.** The permanent risk. One generation
  of managers who mistake a boom for skill would spend thirty years of
  reputation in three.
- **The unbundling of banking.** India's public payment rails mean a
  customer can hold her deposit in one place, borrow in a second, invest in
  a third, with the phone doing the assembling. If deposits ever became as
  promiscuous as loans, the moat narrows. So far human nature has resisted;
  human nature is not a law of physics.
- **Regulation's embrace.** The largest private bank is quasi-public
  infrastructure and will be regulated as such — capital buffers, priority
  lending, perhaps size itself treated as a risk to be taxed.
- **The law of large numbers.** A balance sheet that already touches a
  meaningful share of Indian credit cannot outgrow India by much, forever.
  Growth must decelerate toward the nation's own pace.
- **Scale's paperwork.** The books carry contingent liabilities of ₹27.8
  lakh crore — mostly the routine plumbing of guarantees and currency
  contracts a giant bank writes daily, but a reminder that size demands
  permanent respect.

## Banking in 2050

Project the structural forces forward a generation. India's credit-to-income
ratio remains far below that of rich countries; as a poor country becomes a
middle-income one, banking grows faster than the economy for decades — that
tide is not spent. The physical branch will fade into a trust-symbol and
service point while the phone does the work; artificial intelligence will
read cash flows and score borrowers the way a good branch manager's
intuition once did, making the *judging* function cheaper and the
*gathering* function — trust — comparatively even more precious. The
industry will consolidate around a few institutions whose names are
synonymous with safety, operating at costs their ancestors would not
believe.

The interesting question is whether this bank's true asset survives its own
success. Its moat was never technology, which everyone eventually buys, nor
size, which is arithmetic. It is a three-decade-old institutional habit of
declining profitable-looking mistakes — maintained now without a founder,
without a promoter, by culture alone. If that habit holds for another
generation, the ₹100 experiment goes on quietly compounding in the
mid-teens, and there are few better machines to leave alone. If it slips,
the same leverage that built the fortune stands ready, as always in
banking, to unbuild it faster.

---
*An Omaha Investments chapter. Educational material, not investment advice.
Figures from Screener.in and NSE data via Angel One as of the date above.*