Background
The Municipality of Joinville appealed a state court decision that granted a contractor the right to deduct materials and equipment costs from its ISSQN (Imposto sobre Serviços de Qualquer Natureza—tax on services of any nature) tax base. The contractor had been hired by Companhia Águas de Joinville to perform construction work on a sewage treatment facility and sought to exclude material and equipment costs from the tax calculation on invoices submitted for the work. The trial court had initially denied this deduction via a writ of mandamus, but the State Court of Appeals reversed and allowed it, finding authority under Supreme Court Theme 247 (RE 603.497/MG) and state court precedent.
The municipality appealed to the Superior Court of Justice, arguing that the state court had misapplied federal tax law and incorrectly interpreted the scope of permissible deductions. The Superior Court’s Second Panel heard the case in a virtual session from June 11–17, 2026, and voted unanimously to partially accept the appeal and rule in the municipality’s favor.
The Court’s Holding
The Superior Court reversed the state court’s decision and held that the ISS tax base for construction services is the contract price for the service itself. As a general rule, materials and equipment employed in construction work cannot be deducted from the ISS tax base, regardless of whether the contractor produced them or acquired them from third parties.
The court recognized a narrow exception: materials may be deducted only if they were produced by the service provider outside the work location and are separately commercialized by that provider with ICMS (Imposto sobre Circulação de Mercadorias e Serviços—state value-added tax) assessed. The court emphasized that this restrictive interpretation has been settled across both panels of the Superior Court’s First Section and aligns with the Supreme Court’s 2020 reaffirmation in Theme 247, which clarified that while the constitutional validity of the deduction principle remains sound, its practical application is limited to these narrow circumstances. The court noted that earlier precedents permitting broader deductions were based on a superseded 2010 Supreme Court ruling and must now yield to the consistent jurisprudence established since 2020.
Key Takeaways
- ISS tax base for construction services is calculated on the contract price of services, not on a reduced net amount after material deductions.
- General rule: materials and equipment used in construction cannot be deducted from the ISS tax base, even if purchased rather than self-produced.
- Exception exists only where the contractor produced materials outside the work site and separately invoiced and taxed them under ICMS, which must be affirmatively proven by the contractor.
- The Superior Court’s interpretation on this infraconstitutional tax matter is binding and governs how state and local courts must apply federal tax law.
Why It Matters
This ruling provides clarity and uniformity in Brazilian tax law for construction contractors and municipalities. Construction companies operating across Brazil must now account for ISS on the full service contract value and cannot claim broad material deductions without meeting the narrow exception. This reduces aggressive tax planning strategies and ensures municipalities collect the full ISS owed on construction contracts. The decision also illustrates how Brazil’s court hierarchy resolves conflicts between state court rulings and federal jurisprudence, with the Superior Court of Justice as the authoritative interpreter of federal (infraconstitutional) law.
For in-house counsel and tax departments at construction firms, compliance requires careful documentation if relying on the materials exception—they must prove separate production, location outside the work site, and ICMS taxation. Municipalities can rely on this ruling to enforce ISS collection on the full invoice value in most construction contracts, strengthening local government revenue.
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