{"id":21775,"date":"2026-08-17T10:32:06","date_gmt":"2026-08-17T09:32:06","guid":{"rendered":"https:\/\/belzuz.com\/?post_type=publicacion&p=21775"},"modified":"2026-08-17T11:30:37","modified_gmt":"2026-08-17T10:30:37","slug":"supreme-court-establishes-binding-case","status":"publish","type":"publicacion","link":"https:\/\/belzuz.com\/en\/publicacion\/supreme-court-establishes-binding-case\/","title":{"rendered":"Supreme Administrative Court Establishes Binding Case Law: When Does Entitlement to Compensatory Interest Begin in Administrative Review Proceedings?"},"content":{"rendered":"

The Case Under Analysis \u2013 STA Judgment No. 18\/2026<\/p>\n

The dispute originated from a Vehicle Tax (Imposto Sobre Ve\u00edculos<\/em> \u2013 \u201cISV\u201d) assessment relating to the importation of a used vehicle. After submitting a request for review of the tax act under Article 78 of the General Tax Law (Lei Geral Tribut\u00e1ria<\/em> \u2013 \u201cLGT\u201d), the taxpayer brought the case before tax arbitration, where a partial annulment of the assessment was obtained, together with recognition of the right to compensatory interest accruing from the date on which the tax had been paid.<\/p>\n

The Portuguese Tax and Customs Authority (Autoridade Tribut\u00e1ria e Aduaneira<\/em>) appealed for the purpose of the harmonisation of case law, arguing that, where the case has been preceded by an administrative review request, compensatory interest may only be calculated after one year has elapsed from the submission of that request.<\/p>\n

The Real Significance of the Judgment: Compensatory Interest<\/h2>\n

The practical relevance of the decision lies in determining the moment from which compensatory interest becomes payable on tax that has been overpaid by a taxpayer, in the context of an administrative review request.<\/p>\n

The STA recalled that Article 43 of the LGT establishes two distinct regimes:<\/p>\n

    \n
  1. A general regime, set out in paragraph 1, applicable where the unlawfulness of the assessment is recognised in an administrative complaint or judicial challenge;<\/li>\n
  2. A special regime, provided for in paragraph 3(c), applicable where the annulment of the assessment results from a request for review of the tax act submitted by the taxpayer.<\/li>\n<\/ol>\n

    Under this special regime, compensatory interest is only payable after one year has elapsed from the submission of the review request, unless the delay is not attributable to the Tax Administration.<\/p>\n

    In the case at hand, the taxpayer paid the tax in November 2021 but only submitted the review request in April 2024. Consequently, although the taxpayer ultimately succeeded in the proceedings, interest could not be calculated from the date the tax was paid, but only from April 2025 onwards.<\/p>\n

    Administrative Review: A Mechanism Often Overlooked by Taxpayers<\/h2>\n

    Beyond the issue of compensatory interest, this judgment also serves as a useful reminder of the practical importance of the review of a tax act<\/strong>, provided for in Article 78 of the General Tax Law.<\/p>\n

    In practice, this mechanism allows taxpayers to request that the Tax Authority correct assessments which they consider unlawful, even where the ordinary deadlines for filing an administrative complaint (120 days) or a judicial challenge (3 months) have already expired.<\/p>\n

    This procedure is particularly relevant in situations:<\/p>\n