Capital Adequacy Ratio (CRAR): Tier 1, Tier 2 and the Basel Norms, Explained

Here is the trap most aspirants fall into. They read that a bank has a “capital adequacy ratio of 16%” and quietly assume it means the bank keeps 16% of its money aside in a vault. It does not. The number has almost nothing to do with cash lying idle, and everything to do with a bank’s ability to absorb losses before your deposit is at risk. Once you see what the denominator actually measures, the whole thing clicks, and a lot of banking-crisis news stops being intimidating.

The Capital Adequacy Ratio (CAR), which the RBI officially calls the Capital to Risk-weighted Assets Ratio (CRAR), is the single most important number for judging whether a bank is safe. It is the ratio of a bank’s own capital to its risk-weighted assets. In plain terms, it asks: if a chunk of this bank’s loans go bad tomorrow, does it have enough of its own money, not depositors’ money, to swallow the loss and stay standing? That question is why regulators worldwide, and the RBI at home, treat this ratio as the frontline defence for every depositor.

What the Capital Adequacy Ratio actually measures

CRAR measures a bank’s capital as a percentage of its risk-weighted assets. The formula is deceptively simple:

The confusion clears the moment you separate the two halves. The top is the bank’s capital, the cushion it owns outright: shareholders’ equity, retained profits, and certain reserves. This is money that belongs to the bank, not to depositors or lenders, so it can be burned to cover losses without breaking any promise. The bottom is not the bank’s total loan book at face value. It is the loan book after each asset has been weighted for how risky it is.

That weighting is the clever part, and the part coaching notes usually skip. A loan is not just a loan. A ₹100 crore loan to the Government of India is treated as near riskless, so it might carry a risk weight of 0%, contributing nothing to the denominator. The same ₹100 crore lent unsecured to a struggling company might carry a risk weight of 100% or more, contributing the full ₹100 crore. So two banks with identical loan books of ₹1,000 crore can have very different risk-weighted assets depending on whom they lent to. The ratio rewards a bank for lending carefully and penalises it for chasing risky, high-return borrowers.

Here is a worked example. Suppose a bank has ₹90 crore of capital and ₹1,000 crore of loans. If every loan were high-risk with a 100% weight, its risk-weighted assets would be ₹1,000 crore and its CRAR would be 9%, right at the regulatory floor. Now suppose half those loans were to the government at 0% weight. The risk-weighted assets fall to ₹500 crore, and the same ₹90 crore of capital now yields a CRAR of 18%. Same capital, same total lending, double the safety score, because the second bank took less risk. That is the whole design philosophy in one comparison.

Tier 1 versus Tier 2 capital: the two layers of the cushion

Not all capital is equally good at absorbing losses, which is why the numerator is split into Tier 1 and Tier 2. Think of them as a first line and a reserve line of defence.

Tier 1 capital is the core, the money that absorbs losses while the bank is still a going concern, meaning while it is still open and operating. Its purest form is Common Equity Tier 1 (CET1): paid-up equity shares, retained earnings, and statutory reserves. This is genuine ownership money that never has to be repaid and pays no fixed return, so the bank can lean on it in a crisis without triggering default. Sitting alongside CET1 is Additional Tier 1 (AT1), which includes perpetual bonds that have no maturity date and can be written down if the bank’s capital falls too low. The Yes Bank episode of 2020, when roughly ₹8,400 crore of AT1 bonds were written off, was a hard lesson for retail investors that AT1 is capital, not a safe fixed deposit, and it is meant to take the hit.

Tier 2 capital is the supplementary, second-line cushion, the money that absorbs losses only when the bank is being wound up, a gone-concern situation. It includes subordinated term debt with a fixed maturity, revaluation reserves, and general loan-loss provisions. It is weaker capital because it eventually has to be repaid to those lenders, so a regulator counts it but caps how much of it can prop up the ratio. Under the Basel framework, Tier 2 cannot exceed the amount of Tier 1, so a bank cannot pass the test by loading up on cheap subordinated debt while running thin on real equity.

The distinction matters for a reason you can feel. When you hear that a bank is “well-capitalised”, the honest follow-up is: well-capitalised in what? A bank with a 15% CRAR built mostly on Tier 1 equity is far sturdier than one that hits 15% by stacking Tier 2 debt. This is exactly the kind of quality question the RBI’s supervision looks at, and it is why the framework sets a separate minimum for CET1, not just for the headline ratio. To see where this capital sits inside the wider financial system, it helps to first be clear on the overall banking system in India and how scheduled commercial banks, cooperative banks and NBFCs are structured and supervised.

The Basel norms: from a one-page rule to a crisis-tested framework

The reason every major economy measures capital the same way is a set of international agreements called the Basel norms, drawn up by the Basel Committee on Banking Supervision (BCBS), which sits at the Bank for International Settlements in Basel, Switzerland. The committee has no legal power to force any country to do anything. It writes standards, and national regulators like the RBI choose to adopt them. That soft-law design is worth remembering, because it explains why India can, and does, set its own bar higher than the global minimum.

Basel I (1988) was the first attempt, and it was narrow. It focused almost entirely on credit risk, the risk that a borrower would not repay, and it introduced the idea of risk-weighting assets and a minimum total capital of 8% of risk-weighted assets. It was crude, treating a blue-chip corporate loan and a shaky one in the same 100% bucket, but it was revolutionary in making banks hold capital in proportion to risk rather than to raw size.

Basel II (2004) made the framework three-dimensional, resting on three pillars. Pillar 1 refined minimum capital requirements to cover not just credit risk but market risk and operational risk too. Pillar 2 brought in supervisory review, giving regulators the power to demand extra capital from a bank whose risks the formula did not fully capture. Pillar 3 added market discipline through disclosure, forcing banks to publish their risk profiles so that investors and depositors could judge them. Basel II was more sophisticated, but the 2008 global financial crisis exposed a fatal gap: banks were technically compliant yet dangerously fragile, because the rules said little about the quality of capital or about liquidity.

Basel III (2010 onwards) was the direct answer to that crisis. It kept the 8% total minimum but raised the quality bar sharply, insisting that far more of that capital be pure CET1 equity. It added a Capital Conservation Buffer (CCB) of 2.5%, a rainy-day layer that a bank must build in good times and can draw down in bad ones. It introduced a countercyclical buffer to be switched on when credit growth runs hot, a leverage ratio as a simple backstop against gaming the risk weights, and two liquidity standards, the Liquidity Coverage Ratio (LCR) and the Net Stable Funding Ratio (NSFR), to make sure a bank could survive a sudden run without collapsing. Basel III is not a tweak to Basel II; it is a rethink triggered by a near-death experience for the global banking system.

RBI’s minimum requirement: why India sets the bar above Basel

The RBI has adopted Basel III but deliberately runs a tighter ship than the global floor. This is the number aspirants should memorise with the reason attached, not as a bare figure.

Under RBI norms, an Indian scheduled commercial bank must maintain a minimum total CRAR of 9%, a full percentage point above the Basel III minimum of 8%. Within that 9%, the RBI prescribes a minimum CET1 of 5.5% (against Basel’s 4.5%) and a minimum Tier 1 of 7% (against Basel’s 6%). On top of the 9%, banks must hold the Capital Conservation Buffer of 2.5%, entirely in CET1, which pushes the effective floor a well-run bank should sit above to 11.5%. For the handful of banks judged Domestic Systemically Important Banks (D-SIBs), the ones so large that their failure would shake the whole system, the RBI layers on an additional buffer. As of the latest classification, the State Bank of India, HDFC Bank and ICICI Bank carry this extra requirement.

Why the extra caution? Because India’s banking system leans heavily on public trust and on public-sector banks that carry a sovereign backstop, and because a wave of bad loans in the 2010s showed how quickly capital can erode. Setting the floor at 9% gives supervisors a margin to act before a bank breaches the true danger line. The good news is that Indian banks today sit comfortably above these floors: the system-level CRAR has stayed in the mid-teens in recent years, which is why the sector weathered recent shocks without a depositor panic. When a bank does slip below the floor, it can be placed under the RBI’s Prompt Corrective Action (PCA) framework, which restricts its lending and expansion until it rebuilds capital, the regulatory equivalent of grounding a pilot until they re-qualify.

The RBI began implementing Basel III in India from 1 April 2013, phasing it in over several years to give banks time to raise capital without choking off credit. That phasing is itself a policy judgement, the kind the RBI makes routinely alongside its other core work, from setting interest rates through the Monetary Policy Committee to tracking access to formal finance through the RBI Financial Inclusion Index.

How CRAR protects depositors, and its link to NPAs

The reason this ratio exists at all is to protect people who will never read a bank’s balance sheet: ordinary depositors. When you deposit money, the bank does not lock it away; it lends most of it out. If those loans fail and the bank has no cushion of its own, the losses land on depositors. Capital is the buffer that stands between a bad loan and your savings account. A higher CRAR means the bank can absorb more failure before your deposit is touched, which is precisely why the RBI treats an adequate ratio as non-negotiable rather than as a nice-to-have.

This is where Non-Performing Assets (NPAs) enter, and where the whole system connects. An NPA is a loan on which the borrower has stopped paying interest or principal for 90 days or more, a loan that has effectively gone bad. NPAs attack the capital adequacy ratio from both directions at once, which is what makes them so corrosive. First, a rise in NPAs forces the bank to set aside provisions, money kept to cover the expected loss, and those provisions eat directly into profits and therefore into retained earnings, shrinking the numerator. Second, bad loans and the stress around them can push up the effective risk in the loan book. So as NPAs climb, capital falls and the ratio drops, sometimes fast.

India lived through this in slow motion. Gross NPAs in the banking system climbed through the mid-2010s to a peak of around 11% of gross advances by March 2018, concentrated in public-sector banks, and several of them saw their capital ratios sink toward the danger zone and land in PCA. The policy response was a chain of measures you can now see as one connected story: the government injected fresh capital into weak banks through recapitalisation, the Insolvency and Bankruptcy Code gave lenders a time-bound way to recover money from defaulters, the idea of a bad bank was floated and eventually realised through the National Asset Reconstruction Company Limited (NARCL) to buy stressed loans off bank books, and the debate over privatising public-sector banks gathered force. Every one of those moves was, at bottom, an attempt to protect or rebuild the capital that the CRAR measures. By March 2024 gross NPAs had fallen to a multi-year low of around 2.8%, and banks’ capital ratios recovered in step, closing the loop.

Government recapitalisation of public-sector banks, incidentally, is not free money; it is a budgetary decision that competes with everything else the state spends on, which is why it shows up in the arithmetic of government budgeting. A bank’s capital shortfall, in other words, can become a fiscal problem for the whole country.

How to study this for the exam

Learn the structure before the numbers, because the numbers hang off the structure. Fix in your mind that CRAR is capital over risk-weighted assets, that capital splits into Tier 1 (going concern, high quality) and Tier 2 (gone concern, supplementary), and that the denominator is weighted by risk, not taken at face value. If you can rebuild the formula and explain the risk-weighting idea in your own words with the government-loan-versus-risky-loan example, you can answer almost any conceptual question.

Then memorise the RBI numbers as a small cluster with their logic: total CRAR 9%, CET1 5.5%, Tier 1 7%, plus a 2.5% Capital Conservation Buffer, effective floor around 11.5%, all a notch above Basel III’s 8% total, 4.5% CET1 and 6% Tier 1. Attach one D-SIB fact (SBI, HDFC Bank, ICICI Bank) and one implementation date (1 April 2013). For Basel, remember the arc, not just the years: Basel I did credit risk and 8%, Basel II added the three pillars, Basel III fixed capital quality and added buffers and liquidity ratios after the 2008 crisis. That crisis link is the analytical hook examiners love.

Finally, always tie CRAR back to NPAs and to depositors in any answer, because that is where Prelims factual recall becomes a Mains argument. The moment you can explain that rising NPAs shrink capital, drag the ratio down, trigger Prompt Corrective Action, and threaten depositors, and that the whole IBC-NARCL-recapitalisation machinery exists to defend that ratio, you have moved from memorising a formula to understanding the banking system. That is the level the exam actually rewards.

Frequently Asked Questions

What is the Capital Adequacy Ratio in simple terms?

It is the ratio of a bank’s own capital to its risk-weighted assets, expressed as a percentage. It measures whether a bank has enough of its own money to absorb loan losses before depositors’ money is put at risk. The RBI officially calls it the Capital to Risk-weighted Assets Ratio, or CRAR.

What is the difference between CAR and CRAR?

There is no real difference; they are two names for the same thing. CAR stands for Capital Adequacy Ratio and CRAR for Capital to Risk-weighted Assets Ratio. The RBI uses CRAR in its official circulars, while textbooks and news reports often use CAR.

What is the minimum CRAR that Indian banks must maintain?

The RBI mandates a minimum total CRAR of 9% for scheduled commercial banks, above the Basel III global minimum of 8%. On top of that sits a Capital Conservation Buffer of 2.5%, so a well-run bank should keep its ratio above roughly 11.5%.

What is the difference between Tier 1 and Tier 2 capital?

Tier 1 is core capital, mainly equity and retained earnings, that absorbs losses while the bank is still operating. Tier 2 is supplementary capital, mainly subordinated debt and certain reserves, that absorbs losses only when a bank is being wound up. Tier 1 is higher quality and cannot be repaid; Tier 2 has a maturity and eventually must be repaid.

How do the Basel norms relate to CRAR?

The Basel norms are international standards set by the Basel Committee on Banking Supervision that define how capital adequacy should be measured. Basel I introduced the 8% minimum and risk-weighting, Basel II added the three pillars, and Basel III raised capital quality and added buffers after the 2008 crisis. The RBI adopts these norms and applies its own, slightly stricter, versions in India.

Why does a high level of NPAs lower a bank’s CRAR?

Bad loans force a bank to set aside provisions, which cut into profits and retained earnings, shrinking the capital in the numerator. As capital falls while risk-weighted assets stay high, the ratio drops. This is why India’s NPA surge in the mid-2010s pushed several banks below their capital floors and into Prompt Corrective Action.

How does the Capital Adequacy Ratio protect depositors?

Capital is the bank’s own money, so it takes losses first. A higher CRAR means the bank can absorb more failed loans before those losses reach the money you deposited. By enforcing a minimum ratio, the RBI ensures every bank keeps a buffer standing between bad loans and ordinary savers.

Practice Questions

1. The Capital Adequacy Ratio (CRAR) is best defined as the ratio of a bank’s:

a) Cash reserves to total deposits
b) Capital to risk-weighted assets
c) Total loans to total deposits
d) Net profit to total assets

Answer: b

2. Which of the following is a component of Tier 1 capital?

a) Subordinated term debt
b) Revaluation reserves
c) Common equity and retained earnings
d) General loan-loss provisions

Answer: c

3. Under the RBI’s Basel III norms, the minimum total CRAR required for scheduled commercial banks in India is:

a) 8%
b) 9%
c) 11.5%
d) 12%

Answer: b

4. Which Basel accord first introduced the three-pillar approach of minimum capital, supervisory review and market discipline?

a) Basel I
b) Basel II
c) Basel III
d) Basel IV

Answer: b

1. Consider the following statements about risk-weighted assets:
2. A loan to the Government of India typically carries a lower risk weight than an unsecured corporate loan.
3. Risk weights allow two banks with identical loan books to have different capital adequacy ratios.

Which is/are correct?

a) 1 only
b) 2 only
c) Both 1 and 2
d) Neither 1 nor 2

Answer: c

Mains-style questions

1. Explain the concept of the Capital Adequacy Ratio and discuss how the distinction between Tier 1 and Tier 2 capital reflects the differing capacity of capital to absorb losses.
2. Trace the evolution of the Basel norms from Basel I to Basel III, and evaluate how far Basel III addressed the weaknesses exposed by the 2008 global financial crisis.
3. The RBI prescribes a higher minimum CRAR than the Basel global floor. Examine the reasons for this stricter stance in the Indian context.
4. Analyse the relationship between rising Non-Performing Assets and a bank’s capital adequacy, and assess the policy measures India adopted to protect bank capital during the NPA crisis.
5. “Capital adequacy is ultimately a depositor-protection tool, not merely an accounting requirement.” Critically discuss with reference to the RBI’s regulatory framework.