Basel III Leverage Ratio: Optimize Your Bank's Leverage Requirement

The Leverage Ratio is the ratio of Tier 1 capital to the total exposure measure. The exposure measure comprises on-balance-sheet assets (at carrying value), derivatives exposures (under SA-CCR), securities financing transactions (SFTs), and off-balance-sheet items with credit conversion factors. Netting is permitted only on a limited basis for derivatives and SFTs. The minimum ratio is 3%.

The 2007/2008 financial crisis revealed that banks were excessively leveraged despite high risk-weighted capital ratios, because internal models underestimated risks and low-risk positions required no capital. The Leverage Ratio acts as a non-risk-weighted backstop that limits overall leverage independently of risk models.

Since June 2021, CRR II (Art. 92(1)(d) CRR) mandates a binding minimum of 3% for all CRR institutions. For global systemically important institutions (G-SIIs), an additional leverage ratio buffer has applied since January 2023, equal to 50% of the risk-based G-SII buffer. Supervisory authorities may also set institution-specific requirements through the SREP process.

The exposure measure extends well beyond total assets: it adds off-balance-sheet items (e.g., credit commitments, guarantees) using regulatory credit conversion factors, replaces derivatives carrying values with SA-CCR-calculated exposure values, and includes add-ons for securities financing transactions. Netting is only permitted under qualifying master netting agreements.

Institutions must disclose the Leverage Ratio quarterly using the standardized EBA template. Disclosure includes the core capital ratio, the exposure measure broken down by category (on-balance-sheet items, derivatives, SFTs, off-balance-sheet items), and a reconciliation from balance sheet assets to the exposure measure. G-SIIs must additionally report the leverage ratio buffer.

Breaching the minimum triggers an automatic distribution restriction mechanism: distributions of dividends, variable remuneration, and AT1 coupons are restricted unless the institution submits an approved capital conservation plan. The supervisory authority may also impose additional measures through SREP, such as requiring a recovery plan or restricting certain business activities.

Strategic optimization works through three levers: First, the capital side: strengthening Tier 1 capital through retained earnings or CET1 issuance. Second, the exposure side: reducing off-balance-sheet commitments, optimizing the derivatives portfolio to lower SA-CCR exposure, and more efficient SFT structuring. Third, balance sheet management: targeted deleveraging of low-risk but exposure-intensive positions such as sovereign bonds or central bank reserves.

CRR III (EU 2024/1623, applicable from January 2025) introduces adjustments to exposure calculation: revised SA-CCR calibrations for derivatives, refined CCFs for off-balance-sheet items, and updated rules for central bank exposure treatment. The output floor also becomes indirectly relevant, as higher risk-weighted RWA requirements may change the relative importance of the Leverage Ratio as a binding constraint.

Derivatives exposures are calculated using the Standardised Approach for Counterparty Credit Risk (SA-CCR). SA-CCR comprises the Replacement Cost (current market value of all derivatives including received variation margin) and Potential Future Exposure (an add-on based on notional values, risk category, and remaining maturity). Cash variation margin may reduce the Replacement Cost if it meets certain conditions (daily exchange, same currency, no threshold).

Global systemically important institutions have been required since January 2023 to maintain a leverage ratio buffer in addition to the 3% minimum. This buffer equals 50% of the risk-based G-SII capital buffer and must be met entirely with CET1 capital. Example: with a G-SII buffer of 2%, the leverage ratio buffer is 1%, resulting in an effective minimum leverage ratio of 4%.