4.

The institution shall monitor the accuracy and performance of its model by conducting a back‐testing programme. The back‐testing has to provide for each business day a comparison of the one‐day value‐at‐risk measure generated by the institution's model for the portfolio's end‐of‐day positions to the one‐day change of the portfolio's value by the end of the subsequent business day. Competent authorities shall examine the institution's capability to perform back‐testing on both actual and hypothetical changes in the portfolio's value. Back‐testing on hypothetical changes in the portfolio's value is based on a comparison between the portfolio's end‐of‐day value and, assuming unchanged positions, its value at the end of the subsequent day. Competent authorities shall require institutions to take appropriate measures to improve their back‐testing programme if deemed deficient. Competent authorities may require institutions to perform back-testing on either hypothetical (using changes in portfolio value that would occur were end-of-day positions to remain unchanged), or actual trading (excluding fees, commissions, and net interest income) outcomes, or both.

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Source: EUR-Lex (Cellar) · retrieved 2026-10-10 · Text as adopted (Official Journal); later amendments are not incorporated in this text.