Why Basel III was needed
Basel II, its predecessor, had three critical flaws exposed by 2008: it allowed banks to hold insufficient capital by relying on their own models to calculate risk (which systematically underestimated it); it permitted excessive leverage via off-balance-sheet vehicles; and it said nothing about liquidity — banks could be solvent but unable to fund themselves. Basel III addressed all three. Citigroup, for example, was technically Basel II compliant while holding capital that would have been wiped out by its actual losses.
| Requirement | Basel II | Basel III |
|---|---|---|
| CET1 capital ratio | 2% | 4.5% + 2.5% conservation buffer = 7% |
| Leverage ratio | None | 3% minimum (Tier 1 capital / total exposure) |
| Liquidity (LCR) | None | 100% of 30-day stressed outflows |
| NSFR (stable funding) | None | Available stable funding ≥ Required stable funding |
The three pillars
Basel III maintains the framework of three pillars. Pillar 1: minimum capital requirements calculated against risk-weighted assets (RWAs), covering credit risk, market risk, and operational risk. Pillar 2: supervisory review — regulators assess each bank's specific risk profile and can impose additional capital requirements beyond the minimum. Pillar 3: market discipline through mandatory disclosure — banks must publish detailed risk exposure data so that markets can price bank risk accurately.
The Liquidity Coverage Ratio (LCR)
The LCR requires banks to hold enough high-quality liquid assets (HQLA — primarily government bonds and central bank reserves) to cover their net cash outflows over a 30-day stress scenario. This directly addressed the liquidity crisis of 2008, where banks were technically solvent but unable to fund their short-term obligations. Ironically, the March 2023 failure of Silicon Valley Bank exposed a gap: SVB had a 100%+ LCR but held long-duration bonds whose market value had collapsed — technically liquid assets that had to be sold at large losses.
Basel III Endgame: the ongoing debate
The final phase of Basel III (dubbed "Basel IV" by banks) significantly changes how RWAs are calculated — limiting the use of banks' own internal models and replacing them with more standardised approaches. US banks have lobbied aggressively against the original proposals, and the final US rules have been substantially diluted. The tension: regulators want more resilience; banks argue excessive capital requirements reduce lending and economic growth.
"More capital is never free — every dollar of required equity is a dollar that cannot be leveraged. The question is always: how much safety is worth how much growth?" — The Basel III trade-off
What this means for you
Understanding Basel III is essential for banking sector investing and analysis. Higher capital requirements reduce ROE (return on equity) for banks — a fact that has permanently compressed bank valuations since 2010. The LCR and NSFR affect bank funding costs and balance sheet composition. And when a banking stress event occurs, Basel III metrics (CET1, LCR) are the first numbers analysts look at to assess a bank's resilience.