By the RE 1167509, the constitutionality of Article 9 caput and §2 of Law No. 13,701 / 2003 of the Municipality of São Paulo was being discussed. The caput of article 9 of the São Paulo law provides that the service provider that issues an invoice authorized by another Municipality, for an applicant established in the Municipality of São Paulo, is obliged to proceed with its registration in the São Paulo City Hall, as required by the municipal regulation. Paragraph 2 of Article 9 provides that legal entities established in the Municipality of São Paulo must withhold the ISS amount if their service provider not located in the Municipality of São Paulo had not registered in the register referred to in the caput of the Article 9. Ou seja, o STF discutiu a constitucionalidade do CPOM (Cadastro de Empresas de Fora do Município) como é chamado na cidade de São Paulo. And by 8 votes to 3, in the judgment of RE 1167509 the STF found article 9 caput and § 2 of Law No. 13,701 / 2003 of the Municipality of São Paulo to be unconstitutional.
The STF also established the following thesis: “It is incompatible with the Federal Constitution to provide for the mandatory registration of a service provider not established in the territory of the Municipality with the Municipal Administration and the imposition of the Withholding Tax on Services by the Municipal Administration. – ISS when the accessory obligation is not fulfilled ”.