…which is based on the Basel III guidelines . BIS central bankers’ speeches  1  It contains a minimum percentage of common equity capital that banks, under Basel III, must keep in proportion to their risk-weighted assets. It also states that banks must maintain a capital conservation buffer as a further cushion against risks.
And since we are dealing with the most important banks in all Member States, the "significant credit institutions" require an extra buffer to reflect this significance in a European context. If you add that up, you arrive at the benchmark that we will use for orientation.