Tax Reform: The Importance of Monitoring Vendors' Simples Nacional Status

Simples Nacional is a differentiated Brazilian tax regime for micro-enterprises (ME) and small businesses (EPP) that unifies the collection of several federal taxes (PIS, COFINS, IRPJ, CSLL, IPI and, in the future, CBS and IBS), state (ICMS) and municipal (ISSQN) taxes into a single collection document (DAS).

Joining this regime brings tax simplification, but imposes clear rules of entry, permanence and exclusion that must be observed both by opting companies and their commercial partners.

Opting for Simples Nacional generally happens in January of each year, with a final deadline of January 31st. During this window, the company can:

• Request entry into the regime;
• Remain as an opt-in;
• Migrate to another tax regime if it no longer meets the requirements.

Newly created companies can also opt for Simples within specific deadlines after registration, provided they meet all legal conditions.

A company may be excluded from Simples Nacional for a variety of reasons, including:

• Revenue above the legal cap;
• Exercising activities forbidden by the regime;
• Changing the CNAE to a non-permitted activity;
• Unpaid tax debts not regularized;
• Registry irregularities with the Federal Revenue or state/municipal tax authorities;
• Failure to comply with ancillary obligations.

Unlike the annual opt-in, exclusion can occur at any point during the year, depending on the reason:

• Retroactive exclusion, in more serious cases;
• Exclusion starting the month after the event;
• Exclusion starting January of the following year, in some specific cases.

This means a vendor may stop being an opt-in at any moment of the year without the contracting company noticing immediately — generating relevant tax risk.

With the implementation of CBS and IBS, a new point of attention arises: vendors opting for Simples Nacional can choose a mixed regime, collecting certain taxes outside the DAS — when collecting IBS and CBS outside the DAS, the possibility arises of the buyer using tax credits.

Some examples of this scenario:

• A small-scale industry that supplies inputs to a larger industry, where the vendor's CNAE is relevant to the production chain, enabling credit generation in the IBS/CBS model;
• An IT services company under Simples Nacional providing services to a mid- or large-sized company not under Simples — certain IT CNAEs are relevant to the credit chain in the new tax model (IBS and CBS).

In the case of the mixed regime, it will be very important to interact with the vendor under Simples Nacional to understand whether they opted for the mixed regime, and also to monitor incoming invoices to check whether taxes are correctly highlighted.

Looking at the rules of inclusion/exclusion/maintenance of the Simples Nacional option and its variations (mixed regime), it is clear that no single strategy can keep the master perfect. However, by using tools such as MDM+ BRO and MUB it is possible to build a mixed strategy — combining automations, workflows and human interactions — that ultimately guarantees high-quality master data:

• On initial onboarding of each vendor, run public queries (RFB, CCC, Simples Nacional) and interact with the vendor to capture possible options for special regimes (like the mixed regime within Simples Nacional);
• In February of each year, for relevant vendors (those with business in the past 3 years, for example), run automated cleansing based on public queries — since the normal entry/exit window is January 31st, running cleansing in the second half of February ensures the correct tax regime is set for vendors in “normal” situations;
• Every month, for vendors classified as Simples Nacional in the base, run automated cleansing on public queries — allowing identification of vendors excluded outside the “normal” window, updating the master to “Not opting for Simples Nacional”, interacting with the vendor for details, and automatically blocking the record for deeper analysis;
• Every month, for Simples Nacional vendors with CNAE relevant to tax credit use, run automated cleansing — enabling identification of those who remain in Simples with CNAEs that can generate credit, and interaction with the vendor to confirm whether they opted for the special regime, enabling the buyer to use IBS and CBS credits;
• Event-driven trigger: for those with ERPs/CRMs/SRMs that support event coupling (SAP Business Workflow Event Manager, TOTVS Event Viewer / Audit Trail Triggers), fire the automated cleansing from events like the creation of a Purchase Requisition / Sales Order, ensuring master data is as up-to-date as possible at the exact moment of the operation.

Zoom

Given the complexity of the rules of opting, remaining and being excluded from Simples Nacional — especially with the new scenarios introduced by the Tax Reform — it is clear that relying only on point-in-time checks or manual controls is not enough to ensure fiscal safety and master data quality.

The Simples Nacional status stops being merely declaratory information and becomes a critical governance attribute, directly impacting correct tax assessment and withholding, use of IBS and CBS credits, compliance of purchase and sale operations, and the total cost of contracting.

In this context, combining public queries, automation and workflows via business rules with structured vendor interaction, enabled by solutions such as MDM+ BRO and MUB, allows companies to shift from a reactive posture to a preventive, intelligent master data and tax management model.

By turning Simples Nacional monitoring into a systemic, integrated and recurring process, organizations reduce fiscal risks, avoid credit losses, increase master data reliability, and gain more predictability and safety for their operations — today and in the new Brazilian tax scenario.