Basel III Explained: A Practical Guide to Capital, Liquidity, Risk Management and Banking Resilience

A bank’s core principle relies on trust. People entrust their hard-earned money to the banks, which ensures the economy’s stability even when debtors fail to repay, markets fluctuate, or cash is withdrawn.

The Basel III regulations are designed to improve banking system resilience to the foreseen risks mentioned above. They were established by the Basel Committee on Banking Supervision (BCBS), an international regulatory body, and became effective in 2015. They originated from the inefficiency of banks to withstand the 2007-09 crisis.

In summary,

the Basel III treaty requires banks to have sufficient capital, decrease the level of leverage, maintain adequate liquidity, and manage risks effectively. All these factors are essential to make sure that the banks remain solvent even when severe conditions arise, which helps the whole financial system avoid a catastrophic crash.

It is important to note that Basel III is not a set of universal laws but a standard for each country to follow while developing their own legislation.

The national regulatory authorities are obliged to adopt these rules and introduce them to the banks under their jurisdiction, which means that countries may impose stricter conditions on their financial institutions than those outlined by Basel III.

1. Why was Basel III introduced?

The global financial crisis revealed that the banking system may be vulnerable if some banks are consistently “too safe.” Several issues were identified:

• Insufficient amount of high quality capital to absorb losses,
• Excessive use of leverage,
• Potential of undercapitalized banks to create liquidity crisis due to sudden decrease of deposit inflows or funding.

Thus, Basel III changes the paradigm of banking supervision from “how much capital banks hold” to a more nuanced consideration of the “quality of capital, level of risk, liquidity and overall resilience.” Basel III also promotes macro prudential oversight and attempts to reduce volatility of risk weighted assets caused by differences in models used by banks.

2. The Three Pillars of Basel III

Basel III sets out three complementary pillars intended to improve bank resilience by making them more transparent and better capitalized. These three pillars are interrelated and should be implemented simultaneously. The first pillar determines the minimum capital requirements.

The second pillar makes supervisory authorities evaluate the banks’ individual risks, and the third pillar increases market discipline by requiring banks to disclose more information about their risks and capital positions to the public.

Pillar 1 : Minimum capital and risk requirements

Pillar 1 determines the amount of capital that a bank should hold for different types of risk, such as credit risk, market risk, and operational risk, as well as the counterparty credit risk and CVA risk.

For instance, when a bank has a significant amount of corporate loans, it cannot assume that every Tk. 100 of such loans is associated with the same degree of risk.

The higher the risk is, the more capital the bank should hold. Moreover, the capital requirements set by Basel III include the capital quality requirement and capital buffers to ensure that the banks are able to withstand financial costs during economic downturns.

Pillar 2 : Supervisory review

The second pillar aims to make sure that in addition to meeting minimum capital requirements, banks implement appropriate risk management, governance, and control processes.

In other words, a bank should have a sound strategy and risk management system to handle its specific exposures and be capable of resisting various types of risk.

For instance, if a bank’s capitalization meets the minimum requirements, but its classified loans increase significantly, the bank’s supervisors should ask the bank to improve its risk management or capitalization.

Pillar 3 : Market discipline

The third pillar requires banks to provide more information about their degree of capitalization, leverage, risk exposure, risk management, and other factors to help investors and other stakeholders understand the bank’s financial position and performance.

To summarize, while the first pillar responds to the question of how much capital a bank needs to hold, the second pillar asks whether this amount of capital is enough. And the third pillar demands for providing more information on the topic.

3. Deep Understanding of Basel III Capital Requirements 

Risk-Weighted Assets (RWA) is one of the key concept of Basel III.

A bank’s assets may have various risk levels, and the total asset amount matters less than the associated risk level. Hence, in determining capital requirements, assets are assessed based on their risk levels based on Capital Requirements under Basel III.

Capital measure Minimum requirement is given as follows:

•  CET1 Capital 4.5% of RWA
•  Tier 1 Capital 6.0% of RWA
•  Total Capital 8.0% of RWA
•  Capital Conservation Buffer 2.5% of RWA

 The buffer is designed to absorb losses during periods of stress and is above the minimum requirements. 

What is CET1? 

CET1, or Common Equity Tier 1, is the highest quality of capital. It is mainly composed of 03 items-

• common shares
•  retained earnings 
•  Certain qualifying reserves

CET1 is the most important component of capital since it is the only one that can absorb losses while the bank is still solvent.

4. A Simple Basel III Capital Example

Suppose Bank ABC has RWA of $100 million.

Its minimum requirements would be approximately:

• CET1 minimum = $100m × 4.5% = $4.5 million
• Tier 1 minimum = $100m × 6% = $6 million
• Total capital minimum = $100m × 8% = $8 million
• Capital conservation buffer = $100m × 2.5% = $2.5 million

Therefore, ignoring other applicable buffers, the bank would normally need to maintain a capital structure capable of supporting a total requirement equivalent to 10.5% of RWA, or $10.5 million, when the conservation buffer is included.

This is why simply saying “the Basel minimum capital ratio is 8%” can be misleading. A bank may have additional buffer requirements on top of the 8% minimum.

5. Capital Buffers: The Safety Cushion

Basel III introduced additional buffers to make banks more resilient.

Capital Conservation Buffer

The 2.5% Capital Conservation Buffer (CCB) is designed to be built up during normal periods and used when banks experience stress.

If a bank’s capital falls into the buffer range, restrictions can apply to distributions such as dividends, share buybacks and certain discretionary compensation.

Countercyclical Capital Buffer

The Countercyclical Capital Buffer (CCyB) is designed to address excessive credit growth and systemic risk.

It can range from 0% to 2.5% of RWA under the Basel standard and is generally met with CET1 capital.

The idea is simple:

Good times → build additional capital.
Bad times → allow that capital to absorb losses and support lending.

Systemically Important Bank Buffers

Large banks whose failure could significantly affect the financial system may face additional capital requirements.

This reflects the principle that a bank with greater systemic importance should generally have greater loss-absorbing capacity.

6. Basel III Leverage Ratio

While risk-weighted capital ratios are generally informative, the potential issue with them is that they are sensitive to the risk weights of assets.That is why Basel III introduced a leverage ratio in order to act as a second pillar for capital regulation.

The formula is actually very straightforward:

Leverage Ratio = Tier 1 Capital ÷ Total Exposure Measure

The minimum Basel leverage ratio is 3%, where total exposure measures include on-balance-sheet items and off-balance-sheet instruments, such as certain derivatives, securities financing transactions.

Simple Example

If a bank holds 6 million in Tier 1 capital, and the total exposure of the bank is 200 million, the leverage ratio would be $6m ÷ $= 3%

Thus, the Basel leverage ratio makes sure that a bank cannot have a falsely high capital ratio due to low risk weights.

7. Liquidity: Basel III’s Second Major Revolution Essay

Capital is protection for the bank against losses. Liquidity is protection for the bank against cash flow problems. A bank can find itself technically solvent but economically bankrupt and unable to meet its obligations when these obligations come due. One of the significant changes brought by Basel III was the creation of two important liquidity standards.

Liquidity Coverage Ratio

The initial liquidity benchmark is the Liquidity Coverage Ratio (LCR). The aim of LCR is to guarantee that the bank possesses a sufficient quantity of High-Quality Liquid Assets (HQLA) to fulfill its liquidity requirements in various stress situations.

LCR can be calculated using the formula below:

LCR = Stock of HQLA ÷ 30-day Net Cash Outflows

The minimum ratio set by Basel is 100%. This implies that the bank’s stock of high-quality liquid assets should be enough to cover the 30-day net cash outflows.

Net Stable Funding Ratio

The second liquidity standard is Net Stable Funding Ratio (NSFR). The objective of NSFR is to ensure that the banks have stable funding as a percentage of their required stable funding.

The formula is given below:

NSFR = Available Stable Funding ÷ Required Stable Funding

The minimum ratio is also 100%. Unlike LCR, which covers short-term cash flow problems, NSFR covers longer-term funding requirements.

8. Credit Risk Under Basel III

Credit risk remains one of the most important risks for commercial banks. Basel III strengthened the framework for determining how much capital banks need against different credit exposures.

Banks may use regulatory approaches such as:

Standardised Approach

Risk weights are prescribed based on characteristics of the exposure, including factors such as asset class and, where applicable, external ratings.

Internal Ratings-Based (IRB) Approaches

Qualifying banks may use internal risk estimates subject to regulatory requirements and supervisory approval.

The final Basel III reforms strengthened the standardized approach and constrained the use of internal models in certain areas.

The broader objective is to improve the credibility and comparability of RWA calculations across banks.

9. Operational Risk

Not every banking loss comes from a borrower default. Banks can also lose money because of:

• Fraud
• Cyber incidents
• System failures
• Processing errors
• Employee misconduct
• Legal disputes
• Business disruption

Basel III’s final reforms replaced the previous operational-risk approaches with a revised standardized operational risk framework.

This makes operational risk an explicit component of regulatory capital calculations rather than treating it as a secondary issue.

10. Market Risk and Counterparty Risk

The treatment of market-related risks is also strengthened by Basel III.

Market Risk

Market risk arises from movements in variables such as:

• Interest rates
• Foreign exchange rates
• Equity prices
• Commodity prices
• Credit spreads

The revised market-risk framework aims to improve risk sensitivity and strengthen the relationship between trading-book risks and required capital.

Counterparty Credit Risk

A bank can suffer a loss even when the underlying transaction is not a traditional loan.

For example, if Bank A makes a derivatives contract with Bank B and Bank B defaults, the Bank A will be exposed to some replacement cost.

Therefore Basel III has framework for counterparty credit risk and Credit Valuation Adjustment or CVA risk.