The Basel Committee has issued a long awaited consultation paper (PDF 575 KB) with proposals to revise some elements of the January 2016 market risk framework.
The main elements are:
Implications for banks
Overall, banks are likely to welcome these sensible and measured proposals. There are no major surprises, and the proposals continue to provide an incentive for banks to adopt an internal models approach.
Banks on the standardised approach could see a reduction in capital requirements for market risk of 15-30 percent.
Banks using the IMA will benefit from the proposed revisions to the PLA framework, whereby less serious failures of the PLA test will not require trading desks to switch from the IMA to the SA.
Banks that have focused on foundational aspects first (such as data alignment, data granularity, migration from Monte Carlo to historical simulation etc.) will not have to re-engineer much as a result of these proposals. However, banks that have a prototype SA/IMA calculator will have to tweak their calculators in order to align to the new requirements.
NMRF will remain an area of concern for some banks, because the Basel Committee has not proposed any significant revisions here.
The Basel Committee proposals would:
All of these proposals would reduce SA capital requirements, bringing them closer into line with the Basel Committee's original intentions. The reduction in risk weights will translate directly into similar reductions in the associated risk capital charges, while KPMG experts reckon that allowing liquid currency pair triangulation will significantly increase the number of liquid pairs from the original 23 to upwards of 190. This will reduce the corresponding risk capital charge because the risk weight for liquid pairs is approximately 30 percent lower than for illiquid pairs.
However, some issues are not addressed, such as the over -capitalisation of a delta-hedged portfolio that is in the money with long gamma.
(i) Profit and Loss Attribution (PLA)
Based on the proposed modifications to the test, it is likely that more trading desks will pass this test compared to before, increasing the incentive to adopt an internal model approach.
(ii) Non-modellable Risk Factors (NMRF)
The Basel Committee has clarified the definition of `representative' real price observations in the context of non-modellable risk factors and the use of data for internal model calibration. There are no `hard' methodology changes proposed, although the Committee seeks further compelling evidence from the industry on various items such as:
In the absence of compelling evidence, the Committee will not make any changes to the treatment of NMRF.
Since the industry has already had two years to lobby on the methodology for NMRF it seems unlikely that any changes will result from this further consultation. Given the flexibility with the choice of data and considering data-pooling schemes, it may be better for banks to look into data vendor solutions to progress further on this front.
The Basel Committee published a consultative document in June 2017 to propose a simplified alternative to the standardised requirements based on two approaches:
The Committee now proposes to adopt the second approach, by recalibrating (applying multipliers to) the Basel 2 standardised approach capital requirements for each risk class of market risk. This is intended to deliver slightly higher capital requirements than under the January 2016 `full' standardised approach. Finalisation of these parameters are subject to further analysis.
1. Treatment of structural FX positions
Scope revisions to include the FX exemption on the FX risk stemming from the investment rather than the amount of the investment itself, and to include structural FX positions in foreign branches in the exemption.
2. Boundary between trading and banking book
Clarification of some details of the boundary between the banking book and the trading book, including equity investments in funds; and clarification that banks should use the mandatory banking book list as the starting point to classify positions.
3. Trading desk requirements
Some revisions to assigning a single head trader per trading desk, since this may not be appropriate for all banks. A trader may be assigned to a maximum of two trading desks subject to supervisory approval but this must not be done with the intention of optimising the likelihood of success in the PLA test. This will provide more flexibility in the way trading desks are established and result in enhanced resource allocation within the bank.
The FAQs published by the Basel Committee provide further clarification on points raised by the industry but do not propose any significant changes. The table below summarises these clarifications.
|1||IMA - Expected Shortfall||
|2||IMA – Liquidity Horizon (LH)||
LH for a risk factor that has maturity lower than prescribed is assigned the LH floor that is equal to or longer than the maturity (10, 20, 40, 60, or 120). E.g. if maturity is 30 days, and prescribed LH is 60, then apply LH 40 (LH ≥ maturity).
With multi-asset class indices (i.e. equity-credit):
|3||IMA- Default Risk Charge (DRC)||Bank may not use simplified modelling approach for credit derivative positions with multiple underlyings (but may use them for equity multiple underlyings).|
|4||Backtesting||Volatility scaling that results in shorter observation periods is not allowed, except to reflect recent stress periods. Further use of the scaled data requires notification to the supervisor.|
|6||Residual Risk Add-on (RRAO)||Bonds with multiple call dates are believed to bear other residual risks for RRAO.|
|7||FX Risk||Non-deliverable currencies are treated in the same way as the deliverable currencies.|
|8||SA – DRC||
|9||Trading Book Boundary||