Case Studies
Case Study: How Simples Nacional Businesses Should Navigate CBS & IBS Integration
Simples Nacional businesses face unique choices in 2026–2027. This case study explains new options and key decision points for small companies.
By NomadicTax Research Team • 5-8 min read • August 20, 2026
## Simples Nacional Meets the Reforma Tributária do Consumo
Simples Nacional—a regime designed for micro and small businesses—now must adapt to sweeping changes involving the new CBS and IBS taxes. The CGSN introduced major updates in resolutions passed in **August 2026**. ([gov.br](https://www.gov.br/fazenda/pt-br/assuntos/noticias/2026/agosto/cgsn-atualiza-regras-do-simples-nacional-para-adequacao-a-reforma-tributaria-do-consumo?utm_source=openai))
Key modifications:
- **CBS and IBS explicitly included** in the set of taxes covered under Simples Nacional.
- Faturamento (gross revenue) tied to **documento fiscal emitido** (issued invoices)—no invoice, no revenue recognition, particularly for operations modifying or complementing earlier invoices.
- **MEI (Microempreendedor Individual)**: Expanded document emission rules—sales of goods and some transportation or service operations now require invoices.
- **Defis abolished** as a separate annual obligation; this fiscal report will now be integrated into the PGDAS-D system for those in Simples.
## Decision Timing: Choosing Regimes & Options for 2027
| Decision | Deadline | Implication |
|---|---|---|
| **Option regular regime for CBS/IBS** if not under Simples Nacional currently | September 2026 for 1st half of 2027 | Enables proper tax planning & cash flow projections. |
| **Opt into CBS/IBS ‘por fora’** for companies already under Simples | Also in September 2026 | Affects how taxes are collected, rates, cash flow. |
| **Switch regime mid-year or adjust revenue thresholds** | For MEI and small businesses, subject to new thresholds, invoices and fiscal recognition dates in 2027 | If gross revenue exceeds certain limits or invoice emission changes, classification changes. |
## Example Scenario: Boutique Studio Under Simples Nacional
Maria runs a graphic design studio in São Paulo, issuing invoices monthly but previously informal. Under new rules:
- She must include CBS/IBS fields in her invoices starting August or December (depending on service type).
- Her revenue recognition depends on invoice issuance—not just receipt of payment. Delays in issuing invoices will hurt her Simples-revenue limit.
- In September 2026, she has the option to opt into a regular CBS/IBS regime for 1st half of 2027, or wait to opt only for 2nd half—she must decide to budget tax and software adjustments accordingly.
- Her MEI status might impose new obligations: e.g. need to issue document fiscal for more types of operations; if she’s issuing more goods or transportation services, need POS or NF-e systems.
## Strategic Takeaways for Small Businesses
- Calculate whether staying under Simples gives lower overall burden vs opting for regular regime—IRS, CBS, IBS, social security contributions.
- Invest early in invoice & tax software that support NF-e / NFS-e etc., with CBS/IBS breakdowns.
- Monitor revenue thresholds closely—crossing them could force reclassification.
- Engage with a tax advisor in Q3 2026 to set the regime choice for 2027, align accounting systems accordingly.
**Bottom line**: For businesses under Simples Nacional, the reform is manageable—but timing and choices in 2026 will shape financial position across 2027. Start planning now so you aren't reacting under pressure.