Understand how the ISS rate table by activity works in Brazil, including municipal rates, service types, calculation rules, and tax risks.

The Tabela de Alíquotas de ISS por Atividade, or ISS rate table by activity, is one of the most important references for companies and professionals that provide services in Brazil. ISS stands for Imposto Sobre Serviços, a municipal tax charged on the provision of services listed under Complementary Law No. 116/2003 and regulated by each municipality. In practice, this means that the applicable ISS rate depends not only on the type of service performed, but also on the city responsible for collecting the tax.

For business owners, accountants, lawyers, consultants, technology companies, healthcare providers, construction firms, and freelancers, understanding the ISS rate table is essential to avoid underpayment, excessive taxation, penalties, and compliance issues. Although federal law establishes general rules and a national list of taxable services, municipalities define the specific rates, usually between 2% and 5%. This makes ISS a tax that requires careful analysis of both the service activity and the local legislation.

How the ISS Rate Table Varies by Activity

The ISS rate table varies by activity because Brazilian tax law classifies services according to specific items and subitems listed in Complementary Law No. 116/2003. Each activity, such as software development, medical services, engineering, education, advertising, cleaning, construction, consulting, or transportation-related services, may fall under a different service code. Once the activity is identified, the taxpayer must check the municipal legislation to confirm the applicable rate. This is why two companies performing similar services in different cities may pay different ISS percentages.

Most municipalities apply ISS rates between 2% and 5%, with 2% generally considered the constitutional minimum and 5% the maximum rate allowed in ordinary cases. However, the actual percentage depends on the local tax code and the classification of the service. For example, a municipality may charge 2% on certain educational services, 3% on technology services, 4% on consulting, and 5% on advertising, events, or high-value professional services. Because of this variation, companies must avoid using generic rates without checking the correct municipal table.

A simplified ISS rate table by activity may look like this:

Key Rules for Calculating ISS by Service Type

To calculate ISS correctly, the first step is to identify the exact service provided and match it with the proper item in the official service list. After that, the taxpayer must verify the municipality entitled to collect the tax. As a general rule, ISS is due in the municipality where the service provider is established, but there are important exceptions. In some cases, such as construction, cleaning, surveillance, labor supply, event organization, and certain health plan services, the tax may be due where the service is actually performed or where the client is located.

The basic ISS calculation is simple: ISS = taxable service price × applicable ISS rate. For example, if a consulting company issues an invoice for BRL 10,000 and the applicable municipal rate is 3%, the ISS due will be BRL 300. However, the simplicity of the formula can be misleading. Companies must evaluate whether the tax is included in the invoice price, whether ISS must be withheld by the client, whether the company is under the Simples Nacional regime, and whether the municipality allows any deduction from the tax base for that specific service.

Service type also affects compliance obligations. Some activities require electronic service invoices, municipal registration, specific service codes, ISS withholding analysis, and periodic tax filings. Businesses under Simples Nacional usually pay ISS inside the unified tax collection document, but the effective ISS burden depends on the annex, gross revenue, and applicable tax bracket. Meanwhile, companies under the regular tax regime calculate ISS according to the municipal rate table. For this reason, accurate classification of the service activity is critical for tax planning and risk reduction.

The ISS rate table by activity is a key tool for understanding how municipal service tax applies in Brazil. Although ISS generally ranges from 2% to 5%, the correct rate depends on the service classification, the municipality’s tax code, the place where the tax is due, and the company’s tax regime. A wrong classification can lead to underpaid tax, penalties, denied deductions, or unnecessary overpayment.

For companies and professionals, the safest approach is to review the service description, confirm the corresponding item under Complementary Law No. 116/2003, check the municipal ISS legislation, and analyze whether withholding or special rules apply. Accountants and tax advisors should also monitor changes in local tax codes, especially in sectors such as technology, construction, healthcare, consulting, education, and digital services.

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