Basel III introduced dynamic capital buffers to prevent banks from depleting their capital reserves during economic expansions, leaving them vulnerable to sudden downturns.
The Capital Conservation Buffer (CCB)
The Capital Conservation Buffer (CCB) requires banks to hold an additional 2.5% of CET1 capital on top of the minimum 4.5% requirement, bringing the operational CET1 target to 7.0%. If a bank’s capital drops into the CCB zone, regulators restrict its ability to pay discretionary bonuses or distribute dividends to shareholders, forcing the firm to retain earnings and rebuild its capital base.
The Countercyclical Capital Buffer (CCyB)
The Countercyclical Capital Buffer (CCyB) is a dynamic control managed by national macroprudential authorities:
[Credit-to-GDP Ratio Spikes] ---> [Regulators Activate CCyB Controls] ---> [Banks Build Capital Cushions]
                                                                                      |
                                                                                      v
[Banks Release Capital to Lend] <--- [Regulators Drop CCyB to Zero] <-----------------+

During periods of excessive credit growth, regulators raise the CCyB requirement (up to 2.5% of RWAs). When the economic cycle turns and a recession hits, regulators lower the CCyB back to zero, allowing banks to use those capital reserves to absorb losses and continue lending to businesses and households.
 
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