Brazil’s ISS tax (Imposto Sobre Serviços de Qualquer Natureza) is a municipal tax on service revenue, charged at rates between 2% and 5% depending on the service and the city collecting it. Each of roughly 5,570 municipalities sets its own rates, deadlines, and local rules inside a federal framework laid down by Complementary Law No. 116/2003. The tax is cumulative, meaning there are no credits for ISS paid on inputs. And starting in 2026, it is being phased out: a new value-added tax called the IBS is running alongside it and will fully replace the ISS by 2033.
Which Services Trigger the ISS
The ISS only applies to services explicitly named on the list annexed to LC 116/2003. If an activity is not on that list, no municipality can charge ISS on it. The list covers legal advice, accounting, engineering, construction, healthcare, cleaning, IT, financial intermediation, and many other categories. Cities cannot expand it on their own; only federal complementary law can add service types.
Software is worth calling out. The Brazilian Supreme Court (STF) ruled in 2020 that licensing or granting the right to use software is a service subject to ISS rather than the state ICMS. That applies whether the software is downloaded or accessed through the cloud, so SaaS, PaaS, and similar subscription models all fall under municipal ISS jurisdiction.
Who Pays: Provider or Recipient
The default taxpayer is the service provider. If your company performs a listed service, you owe the ISS on the revenue from that service.
In practice, the payment obligation often shifts to the buyer through tax substitution (substituição tributária). The recipient withholds the ISS from the provider’s payment and remits it directly to the municipal treasury. Withholding is most common when the provider sits in a different municipality from where the service is performed and has not registered with the local tax authority. Large taxpayers designated by local law are frequently required to withhold regardless of circumstances. If you are the withholding party, an incorrect classification or rate creates liability for your company, not the provider’s.
How the Tax Is Calculated
The base is the gross price of the service before any deduction for costs or expenses. You apply the applicable rate to the full amount billed. Because ISS is cumulative, you cannot credit ISS paid on services you bought against ISS you owe on services you sold.
A narrow set of deductions exists. The most significant applies to civil construction: some municipalities let providers deduct the cost of materials physically incorporated into the work. Outside construction and a few similar carve-outs, the entire gross price is taxable.
Federal law caps rates between 2% and 5%. The 2% floor was introduced by Complementary Law No. 157/2016 to stop cities from undercutting each other in a race to attract service companies with near-zero effective rates. Municipalities cannot grant exemptions or incentives that push the effective ISS below 2%, with only narrow exceptions. Within the 2%–5% band, each city sets its own rates by service category, so the same activity can cost 2% in one municipality and 5% in the next.
How Simples Nacional Handles ISS
Small businesses enrolled in Simples Nacional don’t calculate ISS separately. It is folded into a single unified tax payment covering multiple federal, state, and municipal taxes. The ISS component is embedded in the rate tables of Annexes III, IV, and V of the Simples Nacional law, depending on the service activity.
Which annex applies can depend on the company’s payroll-to-revenue ratio, known as the R Factor. Service companies spending at least 28% of their trailing twelve-month revenue on payroll generally fall under Annex III, which starts at a 6% total combined rate. Those below the 28% threshold land in Annex V, starting at 15.5% combined. Simples Nacional participants pay everything through a single collection document called the DAS.1Governo Federal. Emitir DAS Para Pagamento de Tributos do Simples Nacional
Which City Collects the Tax
This is the single most disputed aspect of ISS, and getting it wrong can mean paying twice when two cities both claim the revenue. The general rule is simple: ISS goes to the municipality where the provider is established. LC 116/2003 then carves out a long list of exceptions that override that default.
Services Taxed Where the Work Happens
For services that are inherently local and physical, the ISS goes to the city where the work is actually performed. Construction is the clearest example: if a São Paulo–based contractor builds a warehouse in Campinas, Campinas collects the tax. The same logic applies to cleaning, security, event production, maintenance, and similar on-site services. Highway-related services are taxed where the road segment sits, and storage or parking services are taxed where the facility is located.
Services Taxed Where the Buyer Is Located
Complementary Law No. 175/2020 completed a shift that had been attempted since 2016, moving ISS collection for several high-value service categories to the municipality where the recipient is located. After a gradual phase-in, since 2023 the full ISS payment for health and veterinary care plans, credit and debit card administration, fund management, and leasing goes to the city where the purchaser is domiciled. This reallocation pulled tax revenue away from financial centers like São Paulo and distributed it to the municipalities where customers actually live.
Cross-Border Services
When a Brazilian company contracts a service from a provider outside Brazil, the Brazilian company must withhold and pay the ISS. The rate is between 2% and 5% depending on the service type and the importer’s municipality. This obligation stacks on top of other withholding taxes, such as IRRF, that may apply to the same cross-border payment, so the combined tax cost of importing services can be substantial.
Exported services get more favorable treatment. Services whose results are verified outside Brazil are generally exempt from ISS under LC 116/2003. The benefit of the service must be consumed or enjoyed by a foreign recipient located abroad. If your Brazilian consultancy advises a client headquartered in Germany and the deliverable is used in Germany, the exemption applies. But if the service is performed in Brazil and produces results that manifest domestically, the ISS still applies even if the client paying for it is foreign. Courts have generally looked at where the direct beneficiary enjoys the economic utility of the service.
Invoicing and Payment
Every ISS-taxable service must be documented with a Nota Fiscal de Serviços Eletrônica (NFS-e), Brazil’s mandatory electronic service invoice.2Governo Federal. Nota Fiscal de Servico Eletronica (NFS-e) The NFS-e records the service type, value, applicable ISS rate, and other data needed for tax calculation. It is both the official transaction record and the trigger for the payment obligation.
Every municipality used to run its own NFS-e platform with its own format, login, and rules. That fragmentation is changing. Brazil’s national NFS-e system, accessible through a unified portal, had already onboarded over 1,280 municipalities as of mid-2025, covering roughly 70% of all NFS-e invoices issued nationwide.3NFS-e Portal. Portal de Gestao NFS-e – Contribuinte As of January 1, 2026, use of the national NFS-e standard became mandatory for all municipalities. The system uses a unified XML format and API-based issuance, which significantly reduces the compliance burden for multi-city service providers.
ISS payment is made through a municipal collection document commonly called a guia de recolhimento or guia de ISS. Each city sets its own deadlines, typically on a monthly cycle. ISS is not paid through the federal DARF, which is exclusively for federal taxes. The one exception is Simples Nacional businesses, which pay their ISS component through the DAS along with all other consolidated taxes.1Governo Federal. Emitir DAS Para Pagamento de Tributos do Simples Nacional
Penalties and Interest on Late Payment
Late ISS payments trigger both penalties and interest. Under the STF’s binding precedent known as Theme 816, late payment penalties imposed by any level of government, including municipalities, are capped at 20% of the tax liability. That ceiling still means a steep cost on overdue balances.
Interest on late municipal tax debts is capped at the SELIC rate, the benchmark rate set by Brazil’s Central Bank. Constitutional Amendment No. 136/2025 codified the principle that no state or municipality may apply monetary correction indexes or interest rates exceeding what the federal government charges on its own tax debts. Municipalities that previously combined inflation-based correction with 1% monthly interest on top of penalties have had to bring their charges in line with the SELIC ceiling. At current SELIC levels, unpaid balances still compound quickly.
The Transition From ISS to IBS
The biggest change to the ISS is that it is being phased out entirely. Brazil’s tax reform, approved in 2025, replaces the ISS along with the state ICMS and the federal PIS, COFINS, and IPI with a dual value-added tax system. The two new taxes are the federal CBS (Contribuição sobre Bens e Serviços) and the state-and-municipal IBS (Imposto sobre Bens e Serviços).4Library of Congress. Brazil: Implementation of Tax Reform Begins
The transition started on January 1, 2026, when the new IBS began being collected at a testing rate of 0.1%, running alongside the existing ISS at full rates. The federal CBS launched simultaneously at 0.9%. These initial rates are designed to let the system prove itself operationally before real revenue shifts begin.4Library of Congress. Brazil: Implementation of Tax Reform Begins
The actual phase-out of ISS rates begins in 2029. From that year through 2032, ISS rates decrease by 10% per year while IBS rates rise proportionally to replace the lost revenue. By 2033, the ISS ceases to exist and all service taxation runs through the IBS. For service providers, this means several years of dual compliance, tracking and paying both the legacy ISS and the new IBS at annually shifting rates.
Unlike the cumulative ISS, the new IBS is a true value-added tax with full input credits. Service companies that currently absorb ISS costs on purchased inputs without any offset will, once the transition is complete, be able to credit IBS paid on those inputs against IBS owed on their sales. The final combined CBS/IBS rate is expected to be higher than current ISS rates, but the credit mechanism changes the math entirely for service-intensive businesses with long supply chains.