Tax Planning
Case Study: Planning Around Simples Nacional Changes With IBS and CBS Implementation
Micro and small enterprises (MEs) must plan ahead due to changes for Simples Nacional, the IBS, and CBS regimes in 2027—here's a case study with strategy.
By NomadicTax Research Team • 5-8 min read • August 14, 2026
## Background & New Regime Changes
Brazil’s tax reform introduces **IBS (Imposto sobre Bens e Serviços)** and **CBS (Contribuição sobre Bens e Serviços)**—new consumption taxes replacing parts of PIS, Cofins, IPI, ICMS, and ISS—with full effect in **2027**. As part of this reform, **Simples Nacional** (regime for micro and small enterprises) is being adjusted. Key changes per Resolução CGSN nº 186/2026: option for Simples Nacional must be made in **September 2026** for effect starting January 1, 2027. The regime will also allow companies to choose whether to pay IBS and CBS **inside the Simples’s unified DAS-Simples payment** or “por fora” (outside it).([www8.receita.fazenda.gov.br](https://www8.receita.fazenda.gov.br/SIMPLESNACIONAL/noticias/noticiacompleta.aspx?id=C739E03C-8482-473F-8E82-F38EC3B13637&utm_source=openai))
## Case: A Small Retailer in São Paulo
**Profile**
- Retailer with **gross annual revenue** of BRL 1.2 million
- Currently under Simples Nacional, paying unified taxes via DAS
- Sells both goods (physical) and some services (delivery, after-sale support)
**Key decisions**
| Decision | Option A: Pay IBS/CBS inside Simples | Option B: Pay outside (“regime regular”) |
|---|---|---|
| Timing for election | Must opt in **September 2026** | Also elected in September 2026 or later (for 2027 but “outside” option takes effect later if chosen) ([www8.receita.fazenda.gov.br](https://www8.receita.fazenda.gov.br/SIMPLESNACIONAL/noticias/noticiacompleta.aspx?id=C739E03C-8482-473F-8E82-F38EC3B13637&utm_source=openai)) |
| Impact on cash flow | Unified payment simplifies accounting, but may increase tax rate if IBS/CBS heavier | More complex accounting; could allow benefit from different deductions or rates, timing advantages |
**Scenario outcome**
- If Retailer picks **inside Simples**: continues paying via **DAS-Simples unificado payment**, including IBS/CBS for Jan-Jun 2027; simpler paperwork, fewer filings.
- If picks **outside**: will have to file separate IBS and CBS payments under regime regular; potentially more tax optimization opportunities for mixed goods/services, but higher compliance burden.
## Action Plan for Similar Businesses
1. **Compute projected tax under both scenarios** using sample revenue and costs, including mixed goods/services, to estimate whether inclusion or exclusion of IBS/CBS is more favorable.
2. **Update accounting systems** to support both collection options—consolidated DAS and separate tax modules.
3. **Training and Internal Controls**: Ensure staff know to make the explicit election in September 2026 and retain evidence.
4. **Monitor legal updates**, as implementation details such as rates, credits, and thresholds may change before the elections period.
## Risks & Mitigation
- Risk: Missing the **September-2026 election** window, locking in less optimal regime for entire 2027.
- Risk: Underestimating compliance costs for regime regular (outside Simples).
- Mitigation: Use tax advisory services; possibly run parallel books for 2026 as a pilot.
## Summary
For small and micro enterprises, the upcoming restructuring of consumption taxes (IBS and CBS) combined with Simples Nacional’s revised election windows demands careful planning. Early modeling, system readiness, and election by September 2026 are keys to optimizing tax burden and ensuring compliance.