Accounting Expertise and Sustainability Reporting in 2026: How to Reduce Greenwashing Risk and Inconsistencies Through Technical Evidence

Accounting Expertise and Sustainability Reporting in 2026: How to Reduce Greenwashing Risk and Inconsistencies Through Technical Evidence

The sustainability agenda has firmly entered the radar of boards of directors, executive management, internal audit departments, and legal teams. What was once viewed as a “best practices report” is now treated as information with economic impact, subject to scrutiny from investors, regulators, and increasingly, disputes and accountability.

In Brazil, this movement gained regulatory traction with CVM Resolution 193, which addresses the preparation and disclosure of Sustainability-Related Financial Information Reports, based on ISSB standards (IFRS S1 and IFRS S2).

The practical consequence is clear: in 2026, many companies will need to raise the level of governance, traceability, and consistency of reported data — and this brings a risk that concerns boards and investors alike: greenwashing and material inconsistencies.

This article explains what is changing, where the main risks arise, and how technical evidence approaches, accounting analysis, and forensic investigations reduce exposure, increase reporting reliability, and protect decision-making.

What Changes with ISSB-Aligned Sustainability Reporting

CVM Resolution 193 establishes the adoption, within Brazil, of sustainability reports based on ISSB standards.

In 2025, CVM also implemented specific adjustments to facilitate voluntary adoption of equivalent Brazilian standards (CBPS 01/IFRS S1 and CBPS 02/IFRS S2) and indicated deadlines and conditions for market communication.

In practice, reporting ceases to be merely “narrative” and begins to require consistency with financial data, focusing on:

Materiality (what truly matters and impacts the company)
Governance (how decisions and controls support disclosed information)
Metrics and targets (how performance is measured, monitored, and explained)
Climate risk (IFRS S2) and its connections to strategy and finance

Additionally, CVM has strengthened a more proactive stance in promoting, regulating, and supervising sustainable finance matters, increasing the importance of informational consistency and quality of evidence.

Why 2026 Increases the Risk of Greenwashing and Inconsistencies

The risk increases for a simple reason: the pressure to publish (and publish effectively) often advances faster than the maturity of data, processes, and controls. This gap creates space for:

1. Claims Not Supported by Evidence: Targets, reductions, and initiatives described without traceability: “we reduced emissions,” “sustainable supply chain,” “clean energy,” “compensation,” “zero deforestation,” etc;

2. Inconsistent Metrics Across Departments: ESG data that does not align with engineering, operations, finance, and accounting. In most cases, the issue is not fraud, but weak governance, inconsistent definitions, and lack of reconciliation;

3. Poorly Defined Boundaries and Scopes: The same indicator changing its basis over time (organizational perimeter, Scope 1/2/3 emissions, units, methodologies).

4. Insufficient Controls and Lack of Audit Trail: Without documentary evidence, logs, version control, approvals, and reconciliations, the company becomes exposed to scrutiny.

5. Rush to Communicate Commitments: When reporting becomes a reputational asset, incentives to embellish narratives increase — and so does the risk of challenge.

Where Problems Typically Appear: Common Signs of Inconsistency

In dispute and investigation projects, certain recurring patterns emerge when the issue is reporting credibility:

Indicators showing “perfect” improvement without plausible operational explanation;
Methodological changes without transparency or reconciliation bridges;
Discrepancies between reports (sustainability vs. annual vs. investor relations vs. presentations);
Announced targets without plans, budgets, or governance structure;
Supplier data accepted without minimum validation;
Relevant estimates and assumptions lacking supporting documentation.

These signs do not necessarily indicate bad faith. However, they highlight a critical point: without technical evidence and an audit trail, reporting becomes a vulnerability — particularly in situations involving shareholders, regulators, stakeholders, and eventually litigation.

How Technical Evidence Reduces Risk: From Data Governance to Defensible Reporting

The technical approach to reducing greenwashing risk does not begin “in the report.” It begins with data governance structures and procedures that make reporting defensible.

1) Clear Definition of Materiality and Scope

The first step is ensuring the company clearly understands:

Which topics are material;
Which organizational and operational perimeter is being reported;
Which assumptions and criteria guide inclusion and exclusion.

2) Reconciliation and Financial Consistency

ISSB-aligned sustainability reports require coherence with strategy and financial impacts. This demands reconciliation with:

CAPEX/OPEX related to targets and projects;
Environmental provisions and contingencies when applicable;
Energy, input, and efficiency costs;
Investments and expected returns from climate initiatives.

3) Internal Controls and Audit Trail

To reduce exposure, companies must demonstrate:

Data origin (source and responsible party);
Calculation rules (methodology and version control);
Approvals (who validated and when);
Evidence (documents, systems, measurements, contracts);
Reconciliations (tests and validations).

4) Risk-Focused Technical Testing

An effective approach is to treat reporting as a set of “assertions” that require evidence:

Existence (does it actually exist?)
Completeness (is anything material missing?)
Accuracy (is the calculation correct?)
Temporal consistency (are metrics comparable over time?)
Integrity (were changes made without traceability?)

Greenwashing in Litigation: What Is Required When Disputes Arise

When the issue moves from reputational debate to dispute, the standard changes. The question is no longer “is the narrative persuasive?” but:

Is the data demonstrable?
Is the methodology defensible?
Is there documentation and traceability?
Is it consistent with financial data and internal decisions?
Was reasonable diligence applied in validating third-party data?

In conflict scenarios, what sustains a position is not intention — it is evidence.

A Practical Mitigation Roadmap: What to Review Before Publication

Below is an objective checklist that significantly increases reporting reliability:

Map critical indicators and their sources;
Define owners per indicator (technical and validation responsibility);
Create a data dictionary (definitions, formulas, scopes, limitations);
Implement minimum reconciliation with finance and operations;
Validate relevant assumptions and document their basis;
Test temporal consistency (method changes and comparability);
Verify coherence across communication channels (IR, annual report, presentations, website);
Review sensitive claims (neutrality, compensation, “100%,” “zero”);
Organize evidence and audit trail;
Prepare technical responses for potential challenges (evidence Q&A).

This framework reduces contestation risk and facilitates assurance processes, audits, and, if necessary, technical defense.

How DFEXA Supports Technical Security in 2026 Reporting

Sustainability reporting in 2026 requires more than strong communication — it requires consistency, traceability, and technical evidence.

DFEXA operates at the intersection of numbers, evidence, and disputes, supporting companies and law firms in validating information, identifying inconsistencies, and building defensible foundations for strategic decision-making.

If your organization needs to strengthen data governance, reduce greenwashing risk, and increase reporting reliability, DFEXA is prepared to support you with method, independence, and technical rigor.

Contact us and bring greater clarity and technical security to your disclosure process.