Basel III
International banking regulatory framework strengthening capital requirements and risk management for banks post-2008 crisis.
Basel III is a comprehensive set of international banking regulations developed by the Basel Committee on Banking Supervision (BCBS) in response to the 2008 global financial crisis. Implemented progressively from 2015 through ongoing phased implementation, Basel III significantly tightened bank capital requirements, introduced new liquidity standards, and improved leverage ratio monitoring.
Core Basel III capital requirements: Tier 1 capital ratio (CET1—Common Equity Tier 1—must be at least 4.5% of risk-weighted assets, with total Tier 1 at 6%). Total capital ratio (including Tier 2) must be at least 8%. Capital conservation buffer of 2.5% in CET1 above minimums, bringing effective CET1 to 7%. Countercyclical capital buffer (up to 2.5%) set by national regulators during credit booms. Global Systemically Important Banks (G-SIBs) face surcharges of 1–3.5% CET1.
New liquidity standards: Liquidity Coverage Ratio (LCR) requires banks to hold enough high-quality liquid assets (HQLA) to survive a 30-day stress scenario. Net Stable Funding Ratio (NSFR) requires banks to fund long-term assets with stable longer-term funding. These standards directly addressed the liquidity failures that accelerated the 2008 crisis.
Leverage ratio: a non-risk-based backstop requiring Tier 1 capital of at least 3% of total exposures, preventing excessive leverage regardless of risk-weighting.
The 'Basel III endgame' (Basel IV) reforms finalized in 2023 further strengthen risk-weighted asset calculations, standardizing internal model approaches and increasing capital requirements for market and operational risk.
FAQs
What is the difference between Tier 1 and Tier 2 capital under Basel III?
Tier 1 capital is the highest quality, most loss-absorbing capital, consisting of Common Equity Tier 1 (CET1—common shares, retained earnings, other comprehensive income) and Additional Tier 1 (AT1—instruments like contingent convertible bonds/CoCos that can absorb losses without triggering insolvency). Tier 2 capital is supplementary loss-absorbing capital including subordinated debt (at least 5-year maturity), certain loan loss reserves, and hybrid instruments. In bankruptcy, Tier 1 absorbs losses while keeping the bank a going concern; Tier 2 absorbs losses in insolvency (gone-concern). Basel III prioritizes CET1 as the purest form of capital because it has no redemption requirement and absorbs losses at all times.
How does the Liquidity Coverage Ratio (LCR) work?
The LCR requires banks to maintain a stock of High Quality Liquid Assets (HQLA) sufficient to cover 100% of net cash outflows over a 30-day stress scenario. HQLA consists of Level 1 assets (central bank reserves, government bonds—counted at 100%) and Level 2 assets (certain agency and corporate bonds—counted at 85% or 75% depending on quality). Net cash outflows are calculated by applying standardized run-off rates to different liability types: retail deposits have low run-offs (3–10%), wholesale funding has higher run-offs (25–100%). The LCR ensures banks could survive a 30-day market freeze by holding a buffer of instantly liquidatable assets. A bank with LCR below 100% must take corrective action.
How does Basel III affect corporate lending rates?
Basel III increases banks' cost of capital by requiring them to hold more and higher-quality equity capital against each loan's risk weight, reducing return on equity for a given loan portfolio. Banks pass these higher capital costs to borrowers through higher loan spreads and fees. Risk-weighted capital calculations mean that riskier loans (lower-rated corporate borrowers, longer tenors, non-investment grade) require more capital, resulting in proportionally higher spreads. Banks may also price intraday credit lines and standby facilities more explicitly under Basel III due to capital charges for these commitments. The net effect is higher borrowing costs across the corporate credit spectrum, most pronounced for below-investment-grade borrowers.
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