What it means
Banks lend out other people's money, so a bad run of losses can quickly threaten depositors. The Basel Accords require banks to hold a minimum amount of their own money, called capital, as a buffer against such losses.
The more risk a bank takes, the more capital it must hold. There have been three main versions.
Basel I, agreed in 1988, set a simple minimum of 8% capital against risk-weighted assets, which are a bank's loans and investments scaled by how risky each one is. Basel II added more detailed risk measurement and supervision, and Basel III, developed after the 2008 financial crisis, raised the quality of capital and introduced extra buffers and liquidity rules.
The accords are not law by themselves. Each country decides how to write them into its own regulations, so the details vary between regions.
Even so, they set the common language that banks, investors and supervisors use around the world. For business people, the effect is indirect but real.
Capital rules influence how much banks charge for different types of lending, because loans that need more capital cost more to hold. Property development loans, unrated corporate loans and trading positions often carry higher weights than government bonds or secured home loans.
The main nuance is that Basel rules set minimums, not guarantees. Banks usually hold more than the minimum, and critics argue that risk weights can be gamed or can lag behind new risks.
Regulators keep revising the framework as markets change. Supervisors also look beyond the headline ratio.
The framework rests on three pillars: minimum capital requirements, supervisory review of each bank's own risk management, and public disclosure so that markets can judge a bank for themselves. Together, these pillars aim to make sure that capital matches the real risks a bank is running.
In practice
Real-world examples
Example 1
A mid-sized bank plans to expand its lending to commercial property. The risk team calculates that the new loans would add $300 million of risk-weighted assets, requiring more capital. The bank decides to raise its lending rate to earn an adequate return on that capital. Some of that cost is passed on to borrowers in the form of higher margins.
Example 2
A manufacturing company is told by its bank that its unsecured loan will be priced higher than a similar secured loan. The relationship manager explains that the bank must hold more capital against the unsecured loan. The company offers equipment as security and the quoted rate falls.
Example 3
An investor compares two banks and notices that one has a much higher capital ratio. Reading the annual report, she sees it stays comfortably above the Basel minimums plus buffers. She decides this bank is better prepared for a downturn and increases her holding. She also notes that a very high ratio can mean the bank is lending too little to earn good returns.
Think of it
Think of the Basel Accords like safety regulations for commercial airlines. Just as regulators require planes to carry a minimum amount of emergency fuel and maintain strict weight limits to handle turbulence safely, the Accords require banks to hold enough financial cushion to survive unexpected economic storms.
Formula
Calculation
Capital ratio = Regulatory capital / Risk-weighted assets x 100
Risk-weighted assets = Sum of (exposure x risk weight)
A bank holds $100,000,000 of corporate loans at a 100% weight, $200,000,000 of home loans at a 35% weight and $50,000,000 of government bonds at a 0% weight. Risk-weighted assets = (100,000,000 x 1.00) + (200,000,000 x 0.35) + (50,000,000 x 0) = 100,000,000 + 70,000,000 + 0 = $170,000,000. With capital of $17,000,000, the capital ratio = 17,000,000 / 170,000,000 x 100 = 10%. At the original 8% minimum, the bank would need 170,000,000 x 0.08 = $13,600,000, so it has $3,400,000 of spare capital.Case study
Seen in the real world
Northgate Bank is a fictional lender that built a large book of unsecured small business loans. After a regulator reviewed its capital in line with Basel standards, Northgate learned that its risk-weighted assets were $2,400,000,000 and its capital ratio had slipped to 8.4%. The bank wanted to keep a safe cushion above the minimum.
In this illustrative story, management stopped paying a dividend for two quarters, sold a portfolio of weaker loans and raised $150,000,000 of new equity. The ratio rose above 11%, and the bank resumed lending with a stronger base. The episode showed that capital rules shape strategy, not just compliance.
In the board pack afterwards, the finance director reported the ratio against internal targets every month. Management agreed that future lending growth would be approved only if the extra risk-weighted assets could be supported by existing capital.
Watch out
Common mistakes
- Thinking the Basel Accords are binding international law. They are standards that each country must adopt through its own legislation or regulation.
- Assuming capital is the same as cash. Capital is a source of funding, such as equity, and the money may be invested in loans.
- Believing a bank meeting the minimum is completely safe. Minimums are a floor, and market conditions can still cause problems.
Questions
People also ask
Who creates the Basel Accords?
The Basel Committee on Banking Supervision, a group of central banks and regulators that meets under the Bank for International Settlements, develops them.
What is the main purpose of Basel III?
It aims to make banks more resilient by raising capital quality, adding buffers and introducing liquidity standards.
Do the rules apply to non-bank companies?
No, they apply to banks, although they affect the loan prices that companies pay.