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Use the CST and cClasstrib attributes in Brazil tax reform

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This article describes the CST and cClasstrib attributes in the Brazilian tax reform for 2026.

Brazil's tax reform introduces two new tax attributes to support the new tax types: CBS, IBS, and the selective tax.

  • CST (Código de Situação Tributária) identifies the specific tax situation for a transaction. For example, it shows the applicable rate, an exemption, or a tax type.
  • cClassTrib (Código de Classificação Tributária) categorizes the transaction for tax purposes.

Maintain both attributes to support tax calculation and ensure compliance with electronic invoicing required by the reform.

Use the cClasstrib Form

This form supports CST and cClassTrib in the core tax system.

To open the form, go to Tax > Setup > Sales tax > cClassTrib to view the codes published by the government.

Note

Microsoft provides the initial version, and you manage later updates.

The following table lists the fields and descriptions.

Field Description
CST code CST code under the Brazilian tax reform that classifies CBS/IBS for the transaction
Description Description of the tax situation.
Explanation code CST code under the new Brazilian tax reform, used to classify CBS/IBS application for the transaction
cClassTrib Worker identification number.
Description CST-IBS/CBS Tax situation description
Description cClassTrib Description of the tax classification.
LC Writing Provision from Brazilian Complementary Law (LC).
Suspended This checkbox shows the status of the current record. When selected, the value is inactive. Inactive (suspended) records stay in the system for historical reference but don't appear in dropdown lists. Use this status for records that aren't valid, temporarily paused, or created in error.

Note

This form doesn't support deleting records.

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