Tax Reform: The Importance of Material and Product Master Data Quality

IBS and CBS introduce a fully non-cumulative taxation model based on financial credit, where the tax paid in previous stages can be fully appropriated by the buyer. However, this right to credit is directly conditioned on the quality of the information declared in the operation, especially at the item level.

The audit logic also evolves: tax authorities now operate with integrated platforms, automatic data cross-checks and large-scale electronic validations. In this context, correctly identifying the good or product becomes essential for applying the right tax treatment, significantly reducing room for manual interpretations or after-the-fact adjustments.

In the previous model, many master data inconsistencies were mitigated by specific rules, state-level exceptions or manual adjustments during assessment. With the Tax Reform, this margin shrinks dramatically. The material master becomes the main source of information for the whole fiscal chain: ERP, electronic invoices, digital bookkeeping and audit systems.

This means an error at the source — such as an incorrect NCM or a generic description — propagates automatically across the entire operation cycle, impacting not only the issuing taxpayer but also its customers, whose credits may be denied or challenged.

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The Mercosur Common Nomenclature (NCM) becomes even more relevant in the Consumption Tax Reform. It defines differentiated rates, specific regimes, sector exceptions and, in some cases, the very classification of the good within the economic chain.

An incorrect NCM can lead to undue tax collection, wrong tax rates and loss of credit rights for the buyer. In an environment of highly automated auditing, recurring NCM divergences tend to be quickly caught by tax authorities, raising the risk of fines and fiscal disputes.

The GTIN, previously seen by many companies only as a commercial or logistics requirement, becomes a strategic element of fiscal validation. Integration between the Federal Revenue, State Treasury and GS1 databases enables automatic cross-checking of information such as GTIN, NCM, description and unit of measure.

Inconsistencies across these attributes increase the risk of rejected fiscal documents, blocked operations and challenges in electronic audits. In the new tax model, GTIN reinforces product traceability along the chain and expands the tax authority's ability to systemically identify master data deviations.

The material description stops being just an informational field and starts acting as an element that supports the fiscal classification. Generic, incomplete or imprecise descriptions make it hard to prove the correct product classification and weaken the company's defense in eventual audits.

Standardized, clear technical descriptions aligned to the real characteristics of the product strengthen master data governance, reduce ambiguity and increase consistency of information declared to the tax authority, especially in an environment of automatic data cross-checking.

A lack of governance in the material and product master can generate a range of fiscal impacts, including:

• Incorrect application of IBS and CBS rates
• Loss or denial of tax credits
• Rejection of electronic fiscal documents
• Divergences between ERP, e-invoices and ancillary obligations
• Contamination of the credit chain, affecting customers and commercial partners
• Increased exposure to electronic audits and infraction notices

These risks make clear that master data quality must be treated as a strategic asset, not just an operational requirement.

Given the complexity of the new tax scenario, the combination of automation, business rules, workflows and queries to standardized content bases enables building a robust, preventive model for material and product master data governance.

With solutions such as MDM+ BRO and MUB, it is possible to structure an integrated strategy that includes:

• Validation at creation and modification time, ensuring that critical information such as NCM, GTIN, description and units is complete and consistent;
• NCM / unit-of-measure option restrictions and automatic assembly of short and long texts based on PDM (material description pattern), mandatory GTIN for specific materials;
• Periodic cleansing and enrichment of the master using business rules and external content bases such as 1WorldSync (Simplus) and GS1;
• Monitoring and triggering actions in the tool for split NCMs and deactivated NCMs linked to materials and products in the base;
• AI agents that support the user in selecting and filling the correct PDM (based on a link, document, text or image) and in selecting the correct NCM based on technical information and business context.

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In the context of the Consumption Tax Reform, material and product master data quality reaches a new level: more than a compliance requirement, the master becomes a structural element of tax assessment in the IBS/CBS model.

In an environment of digital, integrated and data-driven auditing, the consistency between NCM, GTIN, description, units of measure and other master data attributes will be continuously validated throughout the entire economic chain. Master data failures cease to be corrected at assessment time and start being detected at the source, with direct effects on credit rights, acceptance of fiscal documents and the commercial relationship with customers and partners.