Article 63 TFEU must be interpreted as precluding legislation of a Member State, such as that at issue in the main proceedings, in so far as it is liable to lead, when a progressivity clause contained in a convention for the prevention of double taxation is applied, to a higher rate of tax on income merely because the method for determining income from immovable property results in income deriving from immovable property that is not rented out situated in another Member State being assessed at a higher amount than income from such property situated in the first Member State. It is for the referring court to ascertain whether that is in fact the effect of the legislation at issue in the dispute in the main proceedings.
The Court of Justice has given a judgment in the case Verest and Gerards.
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