Supervisory framework for measuring and controlling large exposures
The purpose of large exposure limits is to constrain the maximum loss a bank could face in the event of a sudden failure of a counterparty or a group of connected counterparties and to help ensure the bank remains a going concern. Especially where the bank's counterparty is another bank, large exposure limits can directly contribute towards the reduction of system-wide contagion risk.
The large exposure standard published today includes a general limit applied to all of a bank's exposures to a single counterparty, which is set at 25% of a bank's Tier 1 capital. This limit also applies to a bank's exposure to identified groups of connected counterparties (ie counterparties that are interdependent and likely to fail simultaneously). A tighter limit will apply to exposures between banks that have been designated as global systemically important banks (G-SIBs). This limit has been set at 15% of Tier 1 capital.