BASE 28: turning tax transition into decisions

Brazil's tax reform creates a long transition rather than a single cutover. Between 2026 and 2033, companies must operate old and new rules simultaneously while CBS, IBS, credits and split payment reshape cash flow.

For CFOs, tax leaders and boards, the information is available but fragmented across legislation, technical interpretations and spreadsheets. Understanding the rule is not enough; teams need to see when the financial pressure appears and which decision can change the outcome.

The challenge was to turn a multi-year regulatory model into a product that remained rigorous enough for specialists and legible enough for an executive conversation.

How might a dense tax transition become a transparent, testable and actionable decision model?

I independently lead the entire BASE 28 project: product conception, strategy, UX/UI, AI-assisted implementation, testing and continuous refinement. I am also prospecting users for acceptance testing. Supply is an extension of that same independent practice.

The product is designed for finance and tax leaders who need to understand exposure and compare options, and for procurement teams who need to investigate supplier choices. These are target profiles; user recruitment and validation are ongoing.

A documented visual and behavioral system

I also created the brand design system, documenting the interlocking mark, navy and slate palette, UI and numeric typography, spacing, components, motion and tone of voice. The direction connects institutional sobriety with accounting precision: semantic colors communicate status, while deliberate motion guides interactions.

The experience connects a public benchmark to company-specific analysis, strategic comparison and a shareable executive deliverable. The screens below document the current interface; displayed values are simulation examples, not measured business outcomes.

a. From exploration to company modeling

The public landing page lets visitors explore a sector benchmark before entering their company data. This separates an initial demonstration from a company-specific simulation.

b. Diagnose with visible assumptions

The dashboard connects summary indicators to sensitivity controls and the year-by-year calculation record. Users can inspect the assumptions behind the projection instead of receiving only a final percentage.

c. Compare strategies, then inspect their evolution

Scenarios A/B/C put operational inertia, supplier optimization and contractual pass-through side by side. Financial effects and implementation complexity support comparison. A detail window reveals the temporal trajectory without adding every detail to the main view.

d. Turn a scenario into an adaptation plan

The plan connects the selected scenario to milestones, supply targets and work fronts. Inspecting a year reveals its projected indicators; the plan provides a bridge from analysis to preparation.

e. An executive deliverable beyond the interface

The executive report is the final deliverable of the simulations. Its preview consolidates the company context, summary and financial calculation record, with PDF export or printing so the analysis can be shared and discussed outside the platform.

Supply (CreditFlow) emerged from AI-assisted exploration of the existing product and its flows. A gap became clear: the scenario model depends on an estimated share of qualified suppliers, while companies need a more precise basis for comparing their actual supply chain. I evaluated that opportunity and defined an additional module connected to Core.

In development · Planned as a separately charged recurring add-on. The scope connects supplier import, classification, quote comparison and application of the analysis to the Core scenarios. The classification depends on consulted data and model assumptions; it is not presented here as a confirmed tax entitlement.

The design concentrates the task in one main screen, with supporting microinteractions. Acceptance testing will examine whether users understand the classification, price limit and effect of applying the data to a scenario.

AI supported product exploration and implementation. In the product experience, its role is to interpret calculated scenarios and answer contextual questions; the numerical simulation remains separate from the generated explanation.

Executive opinion: from processing to interpretation

When the user requests an opinion, the interface retains company context and reports that the simulation data is being processed. The generated opinion is then displayed, with options to copy or download the text and close the opinion.

Contextual assistant during use

A side panel supports operational and contextual questions without replacing the main workspace. Suggested questions help users begin; the interface also exposes an option to escalate to a specialist.

The product connects assumptions, scenario comparison and an executive deliverable. Supply extends this journey by replacing the estimated qualified-supplier share with audited supplier data. That integration remains in development.

Evidence: implemented Core interfaces and deliverables; Supply in development. User validation is ongoing.

BASE 28 Core is available on its official domain and is in acceptance testing. I am independently testing and refining the experience while prospecting participants. Supply remains in development. The current evidence is the implemented journey and its simulation deliverables; measured business impact is not yet available.

In a high-stakes domain, clarity comes from showing the chain of reasoning.