{"id":2825,"date":"2025-12-03T10:30:07","date_gmt":"2025-12-03T13:30:07","guid":{"rendered":"https:\/\/oliveiraalves.com.br\/?p=2825"},"modified":"2026-01-06T15:11:17","modified_gmt":"2026-01-06T18:11:17","slug":"stj-reforca-limites-a-base-de-calculo-presumida-do-icms-st-e-consolida-a-seguranca-juridica-tributaria","status":"publish","type":"post","link":"https:\/\/oliveiraalves.com.br\/en\/stj-reforca-limites-a-base-de-calculo-presumida-do-icms-st-e-consolida-a-seguranca-juridica-tributaria\/","title":{"rendered":"STJ Reinforces Limits on the Presumed ICMS-ST Tax Base and Consolidates Tax Legal Certainty"},"content":{"rendered":"<p>The <strong>First Panel of the Superior Court of Justice (STJ)<\/strong>, in the judgment of <strong>Special Appeal No. 2,139,696\/SP<\/strong>, held that <strong>Brazilian states may not simultaneously apply two different criteria<\/strong> to determine the <strong>presumed tax base<\/strong> under the <strong>ICMS Tax Substitution regime (ICMS-ST)<\/strong>: the <strong>Weighted Average Final Consumer Price (PMPF)<\/strong> and the <strong>Value-Added Margin (MVA)<\/strong>.<\/p>\n<p>In the case at hand, the company had been assessed by the <strong>State of S\u00e3o Paulo<\/strong> for the period from <strong>July to December 2009<\/strong>, based on a <strong>hybrid methodology<\/strong>\u2014using the PMPF base when it was lower than the actual transaction value and, otherwise, applying the MVA.<\/p>\n<p>The core of the controversy lay precisely in this <strong>alternative\/concurrent application<\/strong> of the two models, which created <strong>legal uncertainty<\/strong> for the taxpayer regarding the predictability of the criterion adopted by the state tax authorities.<\/p>\n<p>The STJ held that there is <strong>no authorization under complementary legislation<\/strong>\u2014in particular <strong>Complementary Law No. 87\/1996 (the Kandir Law)<\/strong>\u2014for states to <strong>combine two distinct presumed tax-base models concurrently<\/strong>.<\/p>\n<p>The decision emphasizes the <strong>constitutional principle of tax legality<\/strong> (Article 150, I, of the Federal Constitution) and the <strong>principle of legal certainty<\/strong>, insofar as taxpayers must be able to <strong>reasonably foresee which criterion will be applied<\/strong> by the tax authorities.<\/p>\n<p>The <strong>\u201cforward\u201d tax substitution regime<\/strong>\u2014under which the substitute taxpayer anticipates the ICMS due by subsequent participants in the supply chain\u2014presupposes the <strong>future occurrence of the taxable event<\/strong> and the <strong>advance determination of the tax base<\/strong> based on <strong>objective criteria<\/strong>.<\/p>\n<p>Accordingly, the use of <strong>two distinct models<\/strong> undermines the logic of presumption and compromises predictability, as the substituted taxpayer would not know which criterion would ultimately be required. The STJ found that such a practice creates <strong>unacceptable legal uncertainty<\/strong>.<\/p>\n<p>By establishing this understanding, the STJ reinforces that <strong>states must adhere to a single, clearly defined presumed tax-base model<\/strong>, avoiding discriminatory treatment or unexpected tax assessments. This represents a significant advancement for <strong>legal certainty in state taxation<\/strong>, particularly within the <strong>ICMS-ST regime<\/strong>.<\/p>","protected":false},"excerpt":{"rendered":"<p>The First Panel of the Superior Court of Justice (STJ), in the judgment of Special Appeal No. 2,139,696\/SP, held that Brazilian states may not simultaneously [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":2827,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-2825","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tributario"],"acf":[],"_links":{"self":[{"href":"https:\/\/oliveiraalves.com.br\/en\/wp-json\/wp\/v2\/posts\/2825","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/oliveiraalves.com.br\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/oliveiraalves.com.br\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/oliveiraalves.com.br\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/oliveiraalves.com.br\/en\/wp-json\/wp\/v2\/comments?post=2825"}],"version-history":[{"count":3,"href":"https:\/\/oliveiraalves.com.br\/en\/wp-json\/wp\/v2\/posts\/2825\/revisions"}],"predecessor-version":[{"id":3058,"href":"https:\/\/oliveiraalves.com.br\/en\/wp-json\/wp\/v2\/posts\/2825\/revisions\/3058"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/oliveiraalves.com.br\/en\/wp-json\/wp\/v2\/media\/2827"}],"wp:attachment":[{"href":"https:\/\/oliveiraalves.com.br\/en\/wp-json\/wp\/v2\/media?parent=2825"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/oliveiraalves.com.br\/en\/wp-json\/wp\/v2\/categories?post=2825"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/oliveiraalves.com.br\/en\/wp-json\/wp\/v2\/tags?post=2825"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}