Capital adequacy

1. Meaning and economic significance

Banks accept deposits and other repayable funds and use them to extend loans or acquire investments. Their assets may lose value when borrowers default, securities prices fall or operational failures occur. Capital provides a loss-absorbing cushion between these losses and the claims of depositors and other creditors. Capital adequacy regulation therefore limits excessive leverage and supports confidence in financial intermediation.

Capital is not synonymous with cash held in a vault. Nor are ordinary customer deposits regulatory capital: deposits are liabilities that the bank must repay. Regulatory capital consists primarily of shareholders’ funds, eligible reserves and specified loss-absorbing instruments, after prescribed deductions and adjustments. A bank can have substantial deposits yet possess insufficient capital relative to its risks.

Capital adequacy also differs from profitability. Profits retained in the business can strengthen capital, while losses and provisions can erode it. However, current profits do not automatically imply adequate capital if the bank’s exposures are very large or risky. Capital regulation seeks to make banks resilient before losses arise rather than relying entirely on government support after a crisis.

• Solvency concerns a bank’s ability to bear losses and meet obligations over time; liquidity concerns meeting payments when due.
• Deposit insurance compensates eligible depositors within its statutory limit after specified events; capital is the bank’s own first line of loss absorption.
• Capital requirements influence credit supply, lending rates, shareholder returns and the allocation of credit across sectors.

2. Calculation and risk-weighted assets

The numerator of CAR is eligible regulatory capital; the denominator is risk-weighted assets, or RWA. Risk weights reflect the regulatory risk associated with different exposures rather than treating every rupee of assets identically. Under Basel III, the framework covers credit risk, market risk and operational risk. Credit risk arises from counterparty default, market risk from adverse market-price movements, and operational risk from failures of processes, people, systems or external events.

For a simplified credit-risk calculation, an exposure is multiplied by its applicable risk weight. A ₹100 crore exposure assigned a 100% risk weight produces ₹100 crore of RWA; the same amount assigned a 50% weight produces ₹50 crore. Actual weights depend on regulatory rules, exposure category, credit quality, collateral and other conditions. Certain qualifying sovereign exposures receive a zero credit-risk weight; this does not mean every government-related asset is universally risk-free.

Off-balance-sheet commitments also matter. Guarantees and undrawn credit commitments can create future claims on a bank and are brought into the capital calculation through prescribed methods, including credit conversion factors. If eligible capital is ₹120 crore and total RWA is ₹1,000 crore, CAR equals 12%. If RWA rises to ₹1,200 crore without additional capital, CAR falls to 10%, even though the bank has not necessarily incurred a loss.

• CAR can improve through fresh eligible capital, retained earnings or a reduction in RWA.
• A reduction in risky lending can raise CAR without increasing the absolute amount of capital.
• Risk weights are prudential parameters, not direct forecasts of the percentage loss on each loan.

3. Basel framework and the quality of capital

The Basel Committee on Banking Supervision develops international prudential standards for banks. These standards are not automatically domestic law; national authorities implement them through their regulatory frameworks. Basel I, introduced in 1988, established a broad risk-based capital framework. Basel II, published in 2004, organised regulation around three pillars: minimum capital requirements, supervisory review and market discipline through disclosure.

Basel III emerged after the global financial crisis of 2007–09 exposed weak capital quality, excessive leverage and liquidity vulnerabilities. It strengthened the emphasis on Common Equity Tier 1, introduced capital buffers and added a non-risk-based leverage ratio as a backstop. It also introduced liquidity standards: the Liquidity Coverage Ratio and Net Stable Funding Ratio. These complement capital regulation but measure different aspects of resilience.

Common Equity Tier 1, or CET1, is the highest-quality capital, principally comprising eligible common shares and disclosed reserves, including retained earnings, after regulatory adjustments. Additional Tier 1, or AT1, includes qualifying instruments with features such as perpetual maturity and contractual loss absorption. CET1 plus AT1 forms Tier 1 capital, which primarily supports the bank as a going concern. Tier 2 consists of qualifying supplementary instruments, including eligible subordinated debt, intended principally to absorb losses at non-viability or resolution. Ordinary fixed deposits do not become Tier 2 merely because they have a long maturity.

• Pillar 1: minimum regulatory capital requirements.
• Pillar 2: supervisory assessment of risks and capital adequacy, including risks insufficiently captured under Pillar 1.
• Pillar 3: disclosures that facilitate market discipline.

4. Indian requirements and capital buffers

RBI began implementing Basel III capital regulations in India from 1 April 2013. Under the applicable framework for covered commercial banks, minimum CET1 is 5.5%, minimum Tier 1 is 7%, and minimum total capital is 9% of RWA. These are nested requirements, not percentages to be added together. The Basel international minima are respectively 4.5%, 6% and 8%, showing that RBI’s baseline requirements are more conservative.

The capital conservation buffer adds 2.5% of RWA in CET1 above the minimum requirements. Consequently, the usual minimum-plus-buffer benchmarks are 8% CET1, 9.5% Tier 1 and 11.5% total capital. The buffer is designed to be drawn down during stress. Entering the buffer range triggers restrictions on discretionary distributions, such as dividends and bonuses, rather than automatically implying that the bank must immediately close.

Additional requirements depend on the bank and prevailing regulatory decisions. Domestic systemically important banks face an additional CET1 requirement because their distress could have wider consequences. A countercyclical capital buffer is designed to build resilience during excessive credit growth and may be released during downturns; it is not a permanently fixed addition. Supervisory assessments may also require extra capital. These commercial-bank benchmarks should not be mechanically applied to every cooperative bank, NBFC or specialised banking category.

• RBI’s powers to regulate banking companies arise principally under the Banking Regulation Act, 1949.
• The Internal Capital Adequacy Assessment Process connects a bank’s risk assessment, stress testing and capital planning.
• For current-affairs questions, check the latest RBI directions rather than assuming that every buffer is continuously activated.

5. Policy implications and examination distinctions

Stronger capitalisation helps banks withstand shocks and sustain lending during downturns. Nevertheless, raising equity can be costly and dilute existing shareholders. Banks facing capital pressure may retain earnings, issue eligible instruments, sell assets or slow lending. Public sector bank recapitalisation involves the government injecting capital as shareholder; it is distinct from RBI supplying temporary liquidity through monetary operations.

Capital adequacy must be read alongside asset quality, provisioning, concentration risk and governance. Provisions recognise expected or identified impairment, while regulatory capital provides protection against further losses. Delayed recognition of bad loans can overstate profits and capital strength. Stress tests examine whether banks would remain adequately capitalised under adverse scenarios.

For Prelims, avoid confusing CAR with the Cash Reserve Ratio or Statutory Liquidity Ratio. CRR concerns prescribed cash balances with RBI, while SLR concerns prescribed holdings of eligible liquid assets. Neither is the ratio of loss-absorbing capital to RWA. Similarly, a liquidity injection does not automatically recapitalise a bank. A bank may satisfy capital ratios but still suffer a run if depositors demand cash faster than assets can be realised.

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