What the buffer is
The countercyclical capital buffer is the time-varying element of the combined buffer requirement. Designated macroprudential authorities set a buffer rate for exposures located in their jurisdiction, raising it when they judge that cyclical systemic risk, typically excess credit growth, is building, and cutting it, often to zero, when risk materialises so that banks can keep lending through the downturn.
Each bank's own requirement is institution-specific because it is a weighted average of the buffer rates that apply in the countries where its relevant credit exposures sit, weighted by the geographic distribution of those exposures. Two banks operating in different markets therefore face different countercyclical buffer requirements even though the mechanism is common. Like the other buffers, it must be met with common equity tier 1 held above the minimum own funds and Pillar 2 requirements.
How it works in practice
The countercyclical capital buffer is added to the capital conservation buffer, the systemic risk buffer and the G-SII or O-SII buffers to form the combined buffer requirement. Its distinguishing feature is that it is meant to move: authorities announce increases in advance, usually with a twelve-month implementation period, while reductions can take effect immediately to relieve pressure on the system.
Because it is part of the combined buffer requirement, a shortfall in the countercyclical buffer triggers the maximum distributable amount, restricting dividends, additional tier 1 coupons and discretionary pay. The buffer thus works in two directions: it accumulates loss-absorbing CET1 during expansions, and its release frees capital in a contraction. As with all buffers, the CET1 used to meet it sits above the going-concern minima and cannot simultaneously be counted towards a bank's MREL.
Legal basis
The countercyclical capital buffer is established in the CRD. Article 130 requires each institution to maintain an institution-specific countercyclical buffer, and Articles 135 to 140 govern how authorities set buffer rates, including guidance on the buffer guide, recognition of third-country rates and the calculation of the institution-specific rate. The buffer forms part of the combined buffer requirement under Article 128, and its breach engages the maximum distributable amount under Article 141.
Practical relevance for banks and investors
For banks, the countercyclical buffer introduces a moving target that capital planning must anticipate, since announced increases take effect on a known timetable. For investors, changes in buffer rates shift the amount of CET1 a bank must keep above its minima and therefore alter the headroom before distribution restrictions apply. Following the buffer decisions of the relevant national and banking-union authorities is part of assessing an issuer's coupon and dividend resilience over the cycle.