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COMMISSION NOTICE Guidance on the interpretation and application of Council Directive 93/13/EEC on unfair terms in consumer contracts · European Union
Any provision of a national legal system and any legislative, administrative or judicial practice that might impair the effectiveness of EU law by withholding from the national court with jurisdiction to apply such law the power to do everything necessary at the moment of its application to set aside national legislative provisions that might prevent EU rules from having full force and effect are incompatible with those requirements, which are the very essence of EU law […]’ (reference to Case 106/77 Simmenthal, paragraph 22, and Case C-112/13 A, paragraph 37).
Source: EUR-Lex (Cellar) · retrieved 2026-09-25 · Text as adopted (Official Journal); later amendments are not incorporated in this text.