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ANNEX VU.K.USE OF INTERNAL MODELS TO CALCULATE CAPITAL REQUIREMENTS
[10a. In addition, each institution shall calculate a “ stressed value-at-risk ” based on the 10-day, 99th percentile, one-tailed confidence interval value-at-risk measure of the current portfolio, with value-at-risk model inputs calibrated to historical data from a continuous 12-month period of significant financial stress relevant to the institution’s portfolio. The choice of such historical data shall be subject to approval by the competent authorities and to annual review by the institution. The Committee of European Banking Supervisors shall monitor the range of practices in this area and draw up guidelines in order to ensure convergence. Institutions shall calculate the stressed value-at-risk at least weekly.] U.K.