The principle that abusive practices are prohibited must be interpreted as being capable, regardless of a national measure giving effect to it in the domestic legal order, of being applied directly in order to refuse to exempt from value added tax sales of immovable goods, such as the sales at issue in the main proceedings, carried out before the judgment of 21 February 2006, Halifax and Others (C‑255/02, EU:C:2006:121), was delivered, and the principles of legal certainty and of the protection of legitimate expectations do not preclude this.

The principle that abusive practices are prohibited, as applied to the sphere of VAT by the case-law stemming from the judgment in Halifax, thus displays the general, comprehensive character which is naturally inherent in general principles of EU law (see, by analogy, judgment of 15 October 2009, Audiolux and Others, C‑101/08, EU:C:2009:626, paragraph 50).

It should also be added that, according to the Court’s case-law, refusal of a right or an advantage on account of abusive or fraudulent acts is simply the consequence of the finding that, in the event of fraud or abuse of rights, the objective conditions required in order to obtain the advantage sought are not, in fact, met, and accordingly such a refusal does not require a specific legal basis (see, to that effect, judgment of 14 December 2000, Emsland-Stärke, C‑110/99, EU:C:2000:695, paragraph 56; judgment in Halifax, paragraph 93; and judgment of 4 June 2009, Pometon, C‑158/08, EU:C:2009:349, paragraph 28).

Therefore, the principle that abusive practices are prohibited may be relied on against a taxable person to refuse him, inter alia, the right to exemption from VAT, even in the absence of provisions of national law providing for such refusal (see, to that effect, judgment of 18 December 2014, Schoenimport Italmoda Mariano Previti and Others, C‑131/13, C‑163/13 and C‑164/13, EU:C:2014:2455, paragraph 62).

Such application of EU law is consistent with the principles of legal certainty and of the protection of legitimate expectations (see to that effect, inter alia, judgments of 22 January 2015, Balazs, C‑401/13 and C‑432/13, EU:C:2015:26, paragraphs 49 and 50 and the case-law cited, and of 19 April 2016, DI, C‑441/14, EU:C:2016:278, paragraphs 38 to 40).

The interpretation which the Court, in the exercise of the jurisdiction conferred upon it by Article 267 TFEU, gives to EU law clarifies and defines, where necessary, the meaning and scope of that law as it must be, or ought to have been, understood and applied from the date of its entry into force. It follows that, unless there are truly exceptional circumstances, which is not however claimed to be the case here, EU law as thus interpreted must be applied by the courts even to legal relationships which arose and were established before the judgment ruling on the request for interpretation, provided that in other respects the conditions for bringing a dispute relating to the application of that law before the courts having jurisdiction are satisfied (see, inter alia, judgments of 29 September 2015, Gmina Wrocław, C‑276/14, EU:C:2015:635, paragraphs 44 and 45 and the case-law cited, and of 19 April 2016, DI, C‑441/14, EU:C:2016:278, paragraph 40).

(see paras 31-33, 40, 41, 44, operative part 1)