Switzerland's federal department of finance has begun a consultation that could see the introduction of a leverage ratio for all banks and new risk diversification rules.

A revision to financial regulations should see two additions to the Basel III international framework: a leverage ratio dictating that banks' core capital should account for at least 3% of their total exposure, and a change meaning risk concentrations should be measured only according to core capital. Large exposures exceeding 25% of core capital should no longer be permitted in principle, the department said.

The consultation will run until July 14.

The leverage ratio revision should enter force on Jan. 1, 2018, and the risk diversification revision on Jan. 1, 2019.