Tax reform: an execution plan for 2027 and beyond

2027 isn’t far away—it’s already being built into the parameters, master data, and contracts you put in place in 2026. With IBS/CBS requiring item-level disclosure in electronic tax documents and assessment increasingly driven by standardized data, the transition becomes an operational-governance stress test. Companies entering 2027 with a fragile architecture are more likely to lose input tax credits, margin, and cash-flow predictability. This article organizes what has changed on the radar and what can be executed now.

What has changed

The consumption-tax reform has moved from concept to implementation. In recent months, key IBS governance building blocks have been consolidated: the shared management framework, audit and enforcement guidelines, administrative dispute pathways, and criteria for allocating revenue among subnational entities. These institutional pieces set the constraints that will drive timelines, responsibilities, and corporate control design.

On the timeline, 2026 has been framed as a test year for IBS and CBS. From January 1, 2026, electronic tax documents must include IBS and CBS disclosure per transaction, following the layouts and technical notes applicable to NF-e/NFC-e, CT-e, and the DF-e used in services and regulated sectors. Joint guidance has also been issued on 2026 main and ancillary obligations, including—once made available—new declarations connected to specific regimes and digital platforms.

On the technology side, the IBS Assisted Assessment System has advanced. Guidance booklets have been published and a pilot program has been running since January 2026, selecting companies to test information flows, events, validations, and reporting—without fiscal effects. In parallel, technical documentation for the national standard NFS-e (including updates in February 2026) and other DF-e has been updated, adding and adjusting the fields and indicators needed for assessment and credit formation.

For 2027 and 2028, the roadmap is already set: CBS becomes fully effective and PIS/Cofins is extinguished; IPI is reduced to zero for most products (subject to legal exceptions); and the Selective Tax begins. From 2029 to 2032, the ICMS/ISS-to-IBS transition unfolds through a gradual IBS increase matched by proportional reductions of the current taxes, culminating in full effectiveness of the new model in 2033.

How it works

Operationally, the transition is less “a new tax” and more a new way of recording and reconciling taxable events. In 2026, even with test rates, IBS and CBS require parameterization for DF-e disclosure, rules by item and transaction, operation-nature coding, and date consistency that determines when the supply occurs (delivery/availability) and—in specific cases—when payment matters. What used to be fixed mostly in bookkeeping now originates in the document itself.

The IBS Assisted Assessment System makes this shift concrete. Assessment is no longer built solely from internal controls; it is fed in real time by DF-e and their events. The engine consolidates debits and credits, produces a preliminary position, and offers reconciliation tools. A central point: the buyer’s credit is conditioned on the extinction of the supplier’s corresponding debit—whether through split payment and related mechanisms that verify and register extinction, or through other forms of settlement recognized by the system. This introduces chain dependency and sharply increases the value of correct data at the source.

That moves the center of gravity to master data and integrations: product/service catalogs, CFOP/indicators, parties, destination location, applicable regimes, establishment-level parameterization, and auditable trails for adjustments and corrections. ERP, tax, billing, logistics, and finance must speak the same language, because mismatches translate into base, debit, or credit distortions inside the assessment environment itself.

From 2027 onward, with CBS effective and PIS/Cofins out of the picture, pricing and contracts must reflect a new dynamic for tax base and transaction-level transparency. Between 2029 and 2032, the gradual coexistence with declining ICMS/ISS adds a dual-compliance burden: the same sale must reconcile under two models at once, requiring periodic reconciliations and margin simulations by channel, state, and product mix.

Behind the shift

A clear vector sits behind these design choices: national standardization, traceability, and federative coordination. Enriched electronic tax documents, stricter validation rules, and assisted assessment point toward “data-driven compliance,” where tax authorities can see the transaction almost as it happens.

This architecture serves two goals at once. First, it reduces information asymmetry and improves revenue predictability in a destination-based, non-cumulative VAT. Second, it enables shared IBS administration: to allocate revenue, monitor balances, and manage credits consistently across thousands of entities, the system needs data that is comparable, timely, and reliable.

For companies, that means risk migrates: less debate after the fact, more real-time scrutiny of the quality, consistency, and completeness of the data feeding the assessment engine. Data governance stops being “just IT” and becomes a core tax-risk pillar. In internal control terms, this demands decision trails, exception management, and continuous data-quality testing—not only period-end checklists.

Why it matters

The first impact is financial. Credit availability now depends on document consistency and event processing, and the chain can break when a supplier errs, delays, or fails to settle the debit as expected. In highly non-cumulative sectors, the difference between “released” and “contingent” credits becomes a cost-of-capital issue that affects purchasing, negotiation, and inventory decisions.

The second impact is commercial. The 2027–2028 phase requires revisiting pricing clauses, tax pass-through mechanics, adjustment rules, and phase-based adaptation provisions—plus governance to avoid “illusory margins” when comparing with prior periods. From 2029 onward, the dual ICMS/ISS coexistence increases the risk of divergence between tax and management bases, putting pressure on controls and close.

The third impact is risk and compliance. Audits and disputes will increasingly originate in systemic inconsistencies: weak master data, broken integrations, incomplete parameterization, and the absence of audit trails to justify adjustments. Treating 2026 as a “no-effect year” is how many companies enter 2027 carrying a data-and-process backlog that is hard to unwind.

Our view

Preparing for 2027+ should be run as an executive operational-transformation program, with monthly deliverables and clear ownership. The objective isn’t merely to comply—it’s to ensure the company can simulate, reconcile, and defend its credit position and margins in an environment driven by DF-e and national validations.

Practical priorities: (1) set up transition governance (C-level sponsorship, steering committee, KPIs, and decision trails); (2) remediate critical master data and create a single operations dictionary; (3) review DF-e, events, and ERP–tax–logistics–finance integrations end to end; (4) update contracts and pricing policies with phase-based transition clauses; (5) build a simulation and reconciliation lab to run 2026 as the technical rehearsal for 2027. Whenever possible, anchor that lab to pilots and to key suppliers and customers to surface chain frictions early.