Judgment_paragraph 39 · Silvia Georgiana Câmpean v Serviciul Fiscal Municipal Mediaș, anciennement Administrația Finanțelor Publice a Municipiului Mediaș and Administrația Fondului pentru Mediu (C-200/14)

39However, the detailed procedural rules governing actions for safeguarding the rights which taxpayers derive from EU law must not be any less favourable than those governing similar domestic actions (principle of equivalence) and must not be framed in such a way as to render impossible in practice or excessively difficult the exercise of rights conferred by the legal order of the European Union (principle of effectiveness) (see, inter alia, judgment of 6 October 2015 in Târșia, C‑69/14, EU:C:2015:662, paragraph 27 and the case-law cited).