Systemic Risk Buffer (SyRB) Under Basel III: G-SIB and O-SII Buffer Advisory

The Systemic Risk Buffer (SyRB) is a macroprudential tool that addresses non-cyclical systemic risks in the financial system. Under EU law, it is defined in Article 133 CRD and transposed into national law, in Germany through Section 10e of the Banking Act (KWG). The buffer supplements other capital requirements such as the countercyclical buffer and G-SIB/O-SII surcharges. The minimum rate is 0.5% of risk-weighted assets with no upper limit.

G-SIB (Global Systemically Important Banks) buffers are set by the Financial Stability Board based on five criteria: size, interconnectedness, substitutability, cross-jurisdictional activity, and complexity. Surcharges range from 1% to 3.5%. O-SII (Other Systemically Important Institutions) buffers are determined by national supervisory authorities and range from 0.25% to 2%. Where an institution qualifies as both G-SIB and O-SII, only the higher buffer applies.

The SyRB is calculated as a percentage of risk-weighted assets (RWA) and must be held entirely in Common Equity Tier 1 (CET1) capital. Under CRD VI, the buffer can be applied sectorally. For example, only to residential or commercial real estate exposures. National authorities review the rate at least every two years. Buffers exceeding 3% require European Commission approval.

The SyRB can be applied to all institutions, specific groups, or individual sectors. In Germany, the current sectoral SyRB applies to all CRR institutions with residential real estate exposures. Additionally, BaFin annually identifies G-SIBs and O-SIIs. Deutsche Bank is currently the only German G-SIB, while several large banks are classified as O-SIIs.

If an institution falls below the combined buffer requirement including the SyRB, distribution restrictions apply automatically. The institution must submit a capital conservation plan and faces limitations on dividend payments, variable remuneration, and AT1 coupon payments. Supervisory authorities can impose additional measures including enhanced reporting requirements and restrictions on business activities.

ADVISORI provides end-to-end advisory for SyRB compliance: from G-SIB/O-SII identification and buffer calculation through integration into capital planning and regulatory reporting. We automate buffer monitoring, conduct stress tests across buffer scenarios, and support strategic capital structure optimisation considering all Basel III / CRD VI requirements.

The SyRB is applied cumulatively with the capital conservation buffer and the countercyclical buffer. When it overlaps with G-SIB or O-SII buffers, special rules apply: if the SyRB covers all exposures, only the higher of SyRB and G-SIB/O-SII applies. If the SyRB is applied sectorally, both buffers are additive. These interaction rules were simplified under CRD V.