To achieve the broader macro-prudential goal of protecting the banking sector from periods of excess aggregate credit growth and in addition to the CCB requirements, banks may be required to implement the countercyclical buffer (CCyB). Banks must meet the CCyB requirements by using CET1 capital. The level of the CCyB requirements will vary between 0% - 2.5% of RWA and be communicated by the Central Bank with an adequate notice period.