Judgment of the Court of Justice in the case Euro Park Service.
1. In so far as Article 11(1)(a) of Council Directive 90/434/EEC on the common system of taxation applicable to mergers, divisions, transfers of assets and exchanges of shares concerning companies of different Member States does not carry out exhaustive harmonisation, EU law allows for the assessment of the compatibility of national legislation, such as that at issue in the main proceedings, in the light of primary law, where that legislation was adopted to transpose into national law the option provided for in that provision.
2. Article 49 TFEU and Article 11(1)(a) of Directive 90/434 must be interpreted as precluding national legislation, such as that at issue in the main proceedings, which, in the case of a cross-border merger, makes the granting of the tax advantages applicable to such an operation under that directive, in the present case the deferral of the taxation of the capital gains relating to the assets transferred by a French company to a company established in another Member State, subject to a process of prior approval under which, in order to obtain that approval, the taxpayer must show that the operation concerned is justified for commercial reasons, that it does not have as its principal objective, or as one of its principal objectives, tax evasion or tax avoidance and that its terms make it possible for the capital gains deferred for tax purposes to be taxed in the future, whereas in the case of a national merger such a deferral is granted without the taxpayer being made subject to such a process.