Tax ReformNovember 2, 2026By Jiuann Teng· 7 min read

CBS and IBS in the Tax Reform: Transition from 2026 to 2033

Understand the phases of the tax reform, the CBS and IBS timeline, and how the transition impacts cash planning between 2026 and 2033 according to LCs 214 and 227.

The implementation of the Dual Value Added Tax (IVA - Imposto sobre Valor Agregado) model in Brazil, composed of the Contribution on Goods and Services (CBS - Contribuição sobre Bens e Serviços) and the Tax on Goods and Services (IBS - Imposto sobre Bens e Serviços), follows a rigorous transition schedule. This process, governed by Constitutional Amendment guidelines and detailed by norms such as LC 214 and LC 227, requires companies to prepare their cash flows for an environment where distinct tax regimes coexist. This article presents the confirmed phases, legal conditions, and temporal milestones for the adjustment of Brazilian operations.

Tax transition planning · AI-generated illustrative image

The 2026 Milestone: Testing Phase and Conditional Obligations

The editorial reference is November 2, 2026; the testing phase began in January, not on the date of this inquiry. The year 2026 functions as a practical testing period. During this fiscal year, the fixed rates are 0.9% for the CBS and 0.1% for the IBS.

A point of attention for financial planning is that the collection of these test amounts (0.9% and 0.1%) may be waived. However, this waiver is neither automatic nor universal: it is strictly conditioned on the fulfillment of ancillary obligations (obrigações acessórias) and other rules provided for in the legislation. One should not assume an extra 1% cost in a generalized manner without evaluating the operation's compliance. The central objective of this period is technological validation and the adjustment of calculation systems before the full entry into force of the CBS.

2027: The Extinction of PIS/Cofins and the Start of Full CBS

On January 1, 2027, the first definitive structural change occurs. The CBS begins to be required at its full rate, completely replacing the contributions to PIS (Programa de Integração Social) and Cofins (Contribuição para o Financiamento da Seguridade Social). This is the moment when tax management must focus on the transition of credits.

The transition of the IPI (Imposto sobre Produtos Industrializados) also begins at this milestone, with its rates reduced to zero for most products. Important exceptions exist to ensure the competitiveness of the Manaus Free Trade Zone (ZFM - Zona Franca de Manaus), which maintains differentiated regimes. Simultaneously, in 2027, the collection of the Selective Tax (IS - Imposto Seletivo) begins, levied on specific goods and services. It is a common error to project the incidence of the IS for 2026; the legislation links its collection to the start of the full CBS phase in 2027.

Gradual Transition of the IBS: 2029 to 2032

While the federal CBS takes center stage in 2027, the IBS (state and municipal) will have a slower replacement regarding the ICMS (Imposto sobre Circulação de Mercadorias e Serviços) and the ISS (Imposto sobre Serviços). The schedule provides for a staggered transition between the years 2029 and 2032, where the rates of the old taxes are reduced annually while the IBS is proportionally raised.

This period requires companies to maintain dual calculation systems. The conclusion of the process, with the total extinction of the ICMS and the ISS, is scheduled only for 2033. During this gap, operational complexity will be high, as the destination criterion (where consumption occurs) will prevail over the origin criterion, altering the fiscal logistics of organizations. To understand how this change affects industry, it is recommended to analyze PIS/Cofins, CBS and IPI: how to prepare cash for the 2027 transition.

Credits and Non-Cumulativity: Rules and Conditions

The reform promises non-cumulativity subject to legal conditions and exceptions, but the appropriation of credits is not unrestricted or automatic for all inputs. The legislation imposes conditions for the utilization of CBS and IBS credits. For example, there is no guarantee that PIS/Cofins credits accumulated before 2027 will be migrated without exclusion criteria or specific extinction mechanisms.

Contrary to what simplistic interpretations suggest, the appropriation of credits on services (such as consulting, software, and rent) will depend on the verification of legal requirements and the effective incidence of the tax in the previous stage. The right to credit is linked to the payment of the tax by the supplier in various scenarios, which makes supply chain auditing essential. The detailed analysis in Real Profit for importers: when to compare with Presumed Profit demonstrates how these credit criteria are sensitive to the calculation regime.

Impact on Current Regimes: Simples Nacional and Presumed Profit

Simples Nacional remains a constitutionally favored regime. However, for companies purchasing from Simples opt-ins, the IBS/CBS credit may be limited to the amount effectively paid within the single tax guide, unless the supplier chooses to collect the IBS/CBS through the regular regime (outside the DAS - Documento de Arrecadação do Simples Nacional). This option is applicable according to the future tax calendar and should not be considered an immediate effect for 2026.

For companies in the Presumed Profit (Lucro Presumido) regime, the migration to the CBS and IBS represents the end of the simplified cumulative regime for these taxes, moving the operation to the debit and credit system. Real Profit (Lucro Real) does not, by itself, ensure a better adaptation; efficiency will depend on the cost structure of each sector and the capacity to generate financial credits. Pricing must be reviewed considering that ICMS-ST and Selective Tax: differences and impact on product margin may alter gross margins, with no guarantee of stability.

Update of Registrations and Tax Classification

The implementation of the reform requires a profound review of the product catalog. This occurs not only due to the reform itself but also due to the introduction of new tax fields and the need for compliance with updated classifications. The replacement or adjustment of NCMs (Nomenclatura Comum do Mercosul) and new service codes will be necessary so that ERP systems can correctly calculate the Dual IVA and the Selective Tax.

Checklist

Perform fiscal process mapping to identify the incidence of IBS and CBS at the destination location starting from 2029.
Evaluate compliance with ancillary obligations in 2026 to ensure eligibility for the collection waiver of the testing phase.
Review long-term contracts that extend beyond 2027, including rebalancing clauses for the replacement of PIS/Cofins by the CBS.
Monitor the regulation of accumulated ICMS credit balances, the rules for which are provided for in LC 214 and complementary norms.
Adapt IT systems to support the coexistence of seven taxes (PIS, Cofins, IPI, ICMS, ISS, CBS, and IBS) during the peak of the transition.
Verify the tax classification of items subject to the Selective Tax for cost projection in 2027.

Frequently Asked Questions

Is the 1% rate in 2026 a mandatory additional cost?

Not necessarily. The rate of 0.9% (CBS) and 0.1% (IBS) in 2026 is part of a testing phase. Collection may be waived if the company complies with the ancillary obligations determined in the regulations. Otherwise, the amount will be due, but it may be offset in the future according to the current rule.

When do the ICMS and ISS cease to exist?

The total extinction of these taxes is scheduled only for January 1, 2033. Between 2029 and 2032, a gradual reduction (in annual proportions of 1/10 or as defined in the transition) of the tax burden of these taxes occurs in favor of the IBS.

Is the CBS credit guaranteed for any company purchase?

No. The credit depends on proof of the tax incidence in the previous operation and fulfillment of specific legal requirements. The legislation provides for exclusions and conditions, especially for credits that are not linked to the economic activity or that have express prohibitions in the complementary laws.

Where can I find detailed rules on accumulated ICMS credit?

The fundamental guidelines for the utilization of credit balances and offsetting with the IBS are laid out in Complementary Law 214 (Lei Complementar 214), and updates from LC 227 and regulations from the Steering Committee (Comitê Gestor) must be observed.

Legal Disclaimer: This article is for informational purposes only and is based on current legislation and tax reform guidelines as of this date. The content does not constitute legal advice or individualized tax consultancy. Final rates and specific regulations may undergo changes by the Legislative Power. We are not responsible for decisions made based on this information without prior consultation with specialized professionals.