Basel Framework
The Basel Framework is the international regulatory standard that tells banks how much capital they must hold to absorb losses and remain solvent during financial stress.
What You'll Learn
- What the Basel Framework is and who created it
- Why banks need special capital rules
- Capital adequacy ratios (CET1, Tier 1, Total Capital)
- Risk-weighted assets explained
- Liquidity requirements (LCR and NSFR)
- The three pillars of Basel
- Basel I to Basel III evolution
First: What Is This?
The Basel Framework is a set of international banking regulations developed by the Basel Committee on Banking Supervision (BCBS), which is hosted by the Bank for International Settlements (BIS) in Basel, Switzerland. It sets minimum standards for bank capital, liquidity, and risk management.
The framework exists because banks are special: they hold other people's money (deposits) and lend it out. If too many loans go bad, the bank can fail, and depositors lose their savings. The Basel Framework requires banks to keep enough of their own money (capital) as a buffer against losses, so taxpayers and depositors are protected.
Who Does It Apply To?
Is It Mandatory?
The Basel Framework is not directly legally binding - it is a set of minimum standards that national regulators agree to implement through their own laws and regulations. In practice, it is effectively mandatory for internationally active banks in all major jurisdictions. National implementation may exceed Basel minimums.
Capital Adequacy - The Core Concept
Capital adequacy requires banks to maintain minimum ratios of qualifying capital to risk-weighted assets (RWA). Basel III requires: Common Equity Tier 1 (CET1) of at least 4.5% of RWA, Tier 1 capital of at least 6% of RWA, and Total Capital of at least 8% of RWA. Additional buffers (capital conservation, countercyclical, systemic) can raise effective requirements to 13%+ for large banks.
Banks must keep a minimum amount of their own money (capital) relative to the risks they take. If a bank has $100 billion in risk-adjusted loans and investments, it needs at least $4.5 billion of the highest-quality capital (shareholders' equity). The riskier the bank's activities, the more capital it needs. Think of it as a safety cushion.
Imagine you run a lemonade stand and your friends each gave you $10 to invest. You have $100 of their money. The rule says: for every $100 you lend out or invest, you must have at least $4.50 of YOUR OWN money as a safety cushion. That way, if some investments go bad, your own money absorbs the loss first - not your friends' money.
MegaBank has: CET1 capital = $50 billion. Risk-weighted assets = $400 billion. CET1 ratio = $50B / $400B = 12.5%. Minimum required: 4.5% + 2.5% conservation buffer + 1% countercyclical + 2% G-SIB surcharge = 10%. MegaBank exceeds the requirement with a 2.5% buffer above minimum. If CET1 drops below 10%, restrictions on dividends and bonuses kick in.
The 2008 financial crisis showed that many banks had too little capital and too much leverage. When housing loans defaulted, banks could not absorb the losses, leading to taxpayer bailouts. Basel III significantly increased capital requirements to prevent this from happening again.
Thinking the 8% total capital ratio means banks only need $8 for every $100 of loans. The denominator is risk-WEIGHTED assets, not total assets. A $100 government bond might have a 0% risk weight (requiring $0 capital), while a $100 corporate loan might have a 100% risk weight (requiring $8 capital). The actual capital-to-total-assets ratio (leverage ratio) is a separate, simpler measure.
Risk-Weighted Assets (RWA)
Risk-weighted assets are calculated by assigning risk weights to each asset class based on the probability and severity of loss. Under the standardized approach, risk weights are prescribed (e.g., 0% for sovereign debt of highly-rated countries, 20% for bank exposures, 75% for retail, 100% for corporate). Under the internal ratings-based (IRB) approach, banks use their own models subject to supervisory approval.
Not all assets are equally risky. A government bond is safer than a startup loan. Risk-weighted assets adjust for this: safe assets count less, risky assets count more. A $100 million government bond might count as $0 in risk-weighted assets (0% weight), while a $100 million unsecured corporate loan counts as $100 million (100% weight). This determines how much capital the bank needs.
Imagine you lend money to three friends. Friend A always pays back (safe - counts as 0 risk). Friend B usually pays back (medium - counts as half). Friend C sometimes forgets (risky - counts as full). If you lend $10 to each, your 'risk score' is not $30 - it is $0 + $5 + $10 = $15. You need safety money based on $15, not $30.
A bank holds: $200M in AAA sovereign bonds (0% weight = $0 RWA), $300M in bank loans (20% weight = $60M RWA), $500M in residential mortgages (35% weight = $175M RWA), $400M in corporate loans (100% weight = $400M RWA). Total assets: $1.4 billion. Total RWA: $635 million. CET1 required (4.5%): $28.6 million - far less than 4.5% of total assets ($63 million).
Assuming all corporate loans have a 100% risk weight. Under the standardized approach, risk weights vary by external credit rating: AAA to AA- corporates get 20%, A+ to A- get 50%, BBB+ to BB- get 100%, and below BB- get 150%. Unrated corporates typically receive 100%.
Frequently Asked Questions
What are the three pillars of Basel?
Pillar 1: Minimum capital requirements (quantitative rules for credit, market, and operational risk). Pillar 2: Supervisory review (regulators assess whether banks hold enough capital beyond Pillar 1 minimums). Pillar 3: Market discipline (public disclosure requirements so investors and markets can assess bank risk).
What is the difference between Basel I, II, and III?
Basel I (1988): simple capital ratio based on credit risk only. Basel II (2004): added operational risk, internal models, and the three-pillar structure. Basel III (2010-2017): significantly increased capital quality and quantity, added liquidity requirements (LCR/NSFR), leverage ratio, and macroprudential buffers. Basel III is the current framework.
What is the leverage ratio?
The leverage ratio is a non-risk-based backstop: Tier 1 capital divided by total exposure (on and off-balance sheet), with a minimum of 3%. Unlike capital adequacy ratios, it does not use risk weights - every dollar of exposure counts equally. It prevents banks from gaming risk weights to appear well-capitalized while being highly leveraged.