The setting of capital requirements are grouped into what the Basel Committee on Banking Supervision call pillars. Pillar one sets out the minimum capital requirements that banks must maintain to cover their credit market and operational risks based on the percentage of their risk weighted assets. The objective of this pillar is to ensure that banks have adequate capital to absorb potential losses and maintain their solvency in times of financial stress.

From a market risk perspective, pillar one includes value at risk, incremental risk charge, comprehensive risk measure, and risk, not in value at risk. From a credit risk perspective, pillar one includes internal method models, the standardized approach for counterparty credit risk, the internal ratings approach and risks not in IMM, pillar two sets out what capital banks are required to hold above the minimum amount from pillar one, tailored to the risks, needs, and circumstances of a bank. It'll therefore be more impacted by the rules imposed by the regulators of that bank's jurisdiction. Pillar two comprises of two parts.

Pillar two A. This involves the supervisory review process where regulators assess a bank's internal risk management processes and determine if additional capital is required to cover risks that are not captured by the minimum capital requirements set out in pillar one. For example, a bank may have additional market risk due to the illiquidity of securities held on the trading book, or because they hold a high concentration of a specific type of security. Under pillar two A, the bank would be required to hold additional capital. Pillar two B. This only applies to UK banks and requires banks to stress test their operations to ensure they have enough capital under more extreme scenarios and report these back to the regulator. For example, a bank would have to stress test their operations under a variety of macroeconomic conditions. For example, increase in interest rates or decrease in equity markets to ensure they have adequate market risk. Capital. Pillar three is the component of the Basel framework that focuses on market discipline through public disclosure. Pillar three aims to promote transparency and disclosure by requiring banks to provide comprehensive and reliable information about their risk profile, capital adequacy and risk management practices to market participants and other stakeholders.

The internal models approach IMA is one of two methods banks can use to calculate market risk capital requirements under the fundamental review of the trading book. The other is the standardized approach with the internal model. Method IMM exposure values are calculated using an internal risk model that assesses the distribution of future positive market values of derivatives based on modeled market price movements. The internal ratings based approach to credit risk IRB allows banks to model their own inputs for calculating RWA from credit exposures to retail, corporate, financial institution, and sovereign borrowers. Subject to supervisory approval, banks must hold minimum levels of capital relative to their RWAs. These are referred to as the bank's minimum capital ratios. Under Basel, three banks must hold a minimum of 4.5% of their RWAs in the form of CET one capital.

Total tier one capital should be at least 6% of the bank's RWAs. This could be entirely composed of CCE T one, but usually includes a portion of additional tier one capital since 81 is a less expensive form of capital to the bank than CET one capital total capital or the sum of CET 180 1 and tier two capital must be at least 8% of a bank's RWA Additional capital buffers were introduced under Basel three to mitigate the risks associated with the pro-Cyclical nature of lending to customers and technically are considered separate from minimum capital requirements. The capital conversion buffer or CCB is designed to build a bank's capital outside of times of stress, which can then be used during economic downturns. The CCB is comprised of CET one capital only and must be at least two and a half percent of RWA outside of stressed economic times. A bank may face restrictions on capital distributions and executive bonuses. Should the CCB fall below 2.5% of ccet one during normal times.