A Const S.A. filed an appeal with the Central Administrative Court against a corrections made by the Tax Administration for FY 1990 under application of the arm’s length principle (contained in article 57 of the CIRC in Portugal). The Central Administrative Court dismissed the appeal. An appeal was then filed against this decision to the Supreme Administrative Court. By Judgment of 4 February 2004, the appeal was also dismissed at this instance. Dissatisfied with that decision A Const S.A. filed an appeal with the Constitutional Court. Grounds for the appeal was stated as follows “In compliance with the provisions of nº 2 of art. 75-A of the LTC it is moreover expressly stated that the present appeal is based on the concrete review of the constitutionality of art. 57 of the CIRC (in the wording in force on the date of the facts of the case, applicable in casu) taking into account its applicability in the contested decision: a. either because it is a blank provision, containing vague and imprecise concepts, without any definition of criteria of positive law for its concretisation, its application being based on the arbitrary filling by the Tax Authorities of indeterminate general clauses, which violates the constitutional principles and rules of tax legality (art. 106, no. 2, CRP, in the wording in force at the time of the facts of the case, applicable in casu), certainty, legal security and confidence (art. 2 of the CRP); b. because the contested decision, in its interpretation and application of the aforementioned rule (Article 57 of the CIRC) violated the constitutional principles of certainty, legal security, confidence, good faith, equality and impartiality enshrined in Articles 2, 13, 266(1) and (2) of the Constitution.” Decision of Constitutional Court The Court dismissed the appeal of “A Const S.A.” and concluded that the rule contained in no. 1 of article 57 of the Corporate Tax Code, in the original wording, in force at the time of the facts of the case, was not unconstitutional. Excerpts “… In fact, although the delimitation of the assumptions for the application of that regulation depends on a judgment of interpretation and valuation of elements of a technical nature – existence of “special relationships” and a deviation from “normal” prices – and the use of maximum of experience, it does not appear that, as stated in the aforementioned judgment n.º 233/94, “from the constitutional imposition contained in the principle of tax legality, it follows that such presuppositions for the application of the contested regulations legally established are shown to be insufficiently densified, taking into account the specificities of the tax field, where often, and in the exercise of control powers, if will have to resort to indeterminate legal concepts and the contribution of elements of a technical nature to base the decisions of the Administration in the pursuit of the public interest expressed in the correct taxation of economic agents â€. In fact, in this case, the individual knows, in view of the normative postulate, that not every situation will justify the realization of the necessary corrections to determine the taxable profit: this will only happen when we are faced with situations that, terms of the law, whether arising from the existence of special relationships of dependence , causing distortion in relation to market prices and having a direct influence on the determination of that profit. Furthermore, since the criterion adopted by the legislator is objectively related to the market, the administration is left tax, which is responsible for determining the taxable amount under the terms of article 57 of the CIRC, linked to the establishment of the arm’s length price, and this criterion does not include subjective assessments. And if it is true that the questioned rule, similarly to what also happens in other legal systems, does not materialize the valuation criterion that will govern the determination of the arm’s length price, the fact is that the reference to the prices established between independent entities it ends up establishing the objective limits within which such a criterion can be set. In fact, this is what the new transfer pricing regulation – Article 58 of the CIRC- came to clarify, bringing a greater degree of certainty, security and, above all, greater efficiency to the action of the tax administration. However, this does not imply that, previously, article 57, no. 1, of the CIRC did not have sufficient density for taxable persons to determine the presuppositions for the performance of the Administration and for the Courts to proceed with the control of the adequacy and proportionality of the administrative activity. Therefore, it must be concluded that the questioned rule allows the taxable person to fully know and control which quantitative expression of the tax fact is taken into account. It contains a sufficient normative density that conditions administrative activity and binds the administration to the verification of its application assumptions, allowing that the courts can syndicate the administrative decision that this norm makes application. In addition, article 80 of the Tax Procedure Code in force at the time of the facts of the case, which already contained additional requirements for reasons (currently included in article 77, paragraph 3, of the General Tax Law) for cases in which the Administration proceeds to carry out corrections motivated by the existence of special relationships, ends up reinforcing the guarantees that the principle of legality, namely in its dimension of tax typicality, postulates. … Pursued from the knowledge of the appeal, by a decision passed in the meantime, the assessment of the unconstitutionality of the contested decision, for violation of the ” constitutional principles, certainty, legal certainty, trust, good faith, equality and impartiality, enshrined in arts. 2, 13, 266, nº 1, nº 2, of the Constitutionâ€, the appellant, who, in the application for filing an appeal to this Court, had invoked the violation, by the questioned rule – art. 57, no. 1, of the CIRC , in the wording in force at the time of the facts of the case -, of the principles of certainty, legal certainty and trust (art. to this same rule the violation of “constitutional principles of taxation of real income, ...