TNFD Materiality Explained: Financial, Impact and Double Materiality Approaches

Materiality determines which nature-related information enters the report and why. Without a declared approach, readers cannot tell whether an omitted impact was judged financially immaterial, impact-immaterial, outside scope or simply not assessed. The same ambiguity undermines metrics, targets, priority-location explanations and alignment claims.

TNFD therefore asks preparers to state the materiality approach used and apply it consistently across the governance, strategy, risk and impact management, and metrics and targets pillars. The approach should also be reflected in assessment scope, decision records and evidence controls.

Figure 1. Select the TNFD materiality architecture from the reporting objective, users and applicable requirements - not from a generic scoring template.

TNFD recommends using the ISSB definition of material information as the baseline. Under IFRS S1, information is material if omitting, misstating or obscuring it could reasonably be expected to influence decisions of primary users of general purpose financial reports. The analysis focuses on sustainability-related risks and opportunities that could affect the entity’s prospects.

Nature-related dependencies and impacts are often upstream causes rather than the final disclosure conclusion. A dependence on water regulation, pollination, soil function or flood protection can create operational, strategic or financial risks. An impact such as land conversion or pollution can trigger regulation, litigation, market change, stakeholder action, supply disruption or cost. The team should document that pathway.

Evidence for a financial-materiality conclusion

nature interface and location evidence;

dependency or impact pathway;

risk/opportunity mechanism;

affected business model, value chain, strategy or financial planning;

short, medium and long-term effect;

quantitative or qualitative financial evidence;

reasonable and supportable assumptions and uncertainty; and

management and governance approval.

TNFD permits an organisation to apply an impact materiality definition in addition to the ISSB baseline. This can be appropriate where the organisation reports under GRI, is subject to double-materiality regulation, or chooses to provide information to a broader stakeholder audience.

Impact materiality asks about the significance of actual and potential impacts, including through business relationships. It should not be reduced to reputation risk or stakeholder interest. The assessment should consider the nature, scale, scope, irremediability, likelihood where relevant, location, affected ecosystems and people, and the organisation’s involvement.

Evidence for an impact-materiality conclusion

activity and business-relationship map;

direct drivers and state-of-nature evidence;

actual and potential impact pathways;

location and ecosystem sensitivity;

rights-holder and affected-stakeholder evidence;

severity/significance and likelihood methodology;

due-diligence, grievance, incident and expert records; and

approval of thresholds, qualitative overrides and conclusions.

Double materiality does not require two disconnected projects. A common business-activity map, location register, stakeholder evidence and nature-data model can support both lenses. However, the organisation should preserve separate decision questions and outputs so that one conclusion does not mechanically determine the other.

Figure 2. Double materiality can share evidence while retaining separate impact and financial tests, approvals and reporting outputs.

1. Identify the report and intended claim: TNFD-only, IFRS S1, GRI, ESRS, annual report, standalone impact report or combined publication.

2. Identify primary users and other intended audiences.

3. Determine whether law or another standard specifies financial, impact or double materiality.

4. Choose the TNFD baseline and any additional impact lens.

5. Define scope, time horizons, criteria, thresholds, qualitative overrides and governance.

6. Design separate conclusion fields even where evidence and workshops are shared.

7. Map each material matter to the applicable disclosures and metrics.

8. Describe the approach, interactions, limitations and changes in the report.

GRI impact assessments can provide site, value-chain, impact, engagement, policy, action and metric evidence. ESRS double-materiality work can provide impact and financial conclusions, value-chain information and governance records. TNFD can reuse these inputs where definitions, period, boundary and quality are suitable.

Reuse should be controlled through a mapping table that records the source framework, datapoint, definition, boundary, period, materiality lens, TNFD disclosure supported, residual difference and reviewer. Interoperability is strongest when the organisation shares facts but does not copy conclusions blindly.

the materiality definition or definitions applied;

the intended primary users and reporting objective;

whether impact materiality is applied in addition to the ISSB baseline;

the scope of direct operations and value chain assessed;

time horizons and location-specific considerations;

how dependencies, impacts, risks and opportunities were prioritised;

how stakeholder and rights-holder engagement informed the process;

major thresholds, qualitative judgements and limitations;

how the approach is integrated with other reporting requirements; and

any change from the preceding period and its effect on comparability.

“We apply the ISSB investor-focused definition of material information to identify nature-related risks and opportunities for disclosure to primary users. We also assess significant impacts on nature using our GRI-aligned impact methodology. The two assessments share the activity, location and evidence registers but use separate criteria and approvals. Matters are included in this report where they are material under either stated lens; the disclosure index identifies the reporting output supported by each conclusion.”

Why it works: the wording identifies users, lenses, shared process and separate conclusions. Evidence needed: approved methodology, criteria, registers, decisions, mapping and report index. Adaptation warning: do not use this wording unless it matches the organisation’s actual reporting basis.

A beverage producer abstracts water in a basin with declining ecological condition and community concern. The impact assessment concludes that the abstraction contributes to a significant local impact because of basin sensitivity, affected users and cumulative pressure. The financial assessment identifies a medium-term risk from restrictions, higher treatment cost and licence conditions, but the current quantified effect is uncertain.

Under a double-materiality approach, the impact is reportable even if the financial pathway does not yet cross the investor-materiality threshold. The risk analysis remains in the TNFD process and is monitored with clear assumptions. The report does not collapse both conclusions into one “high” score.

Limitation. This is an illustrative scenario and not a materiality conclusion for any real organisation.

1. Calling TNFD automatically double materiality

Correction: TNFD provides flexibility; disclose the actual lens or lenses used.

2. Treating stakeholder votes as the impact-materiality decision

Correction: engagement is evidence; the organisation still applies approved impact criteria and professional judgement.

3. Treating every significant impact as a material financial risk

Correction: test the financial pathway separately and disclose the impact under the relevant impact framework.

4. Omitting severe impacts from an investor-focused assessment without testing risk pathways

Correction: analyse regulation, litigation, market, operational, financing and systemic pathways before concluding.

5. Using one threshold across all locations and time horizons

Correction: allow qualitative and location-specific judgements where aggregation would obscure material information.

6. Changing lenses between pillars

Correction: apply the stated approach consistently and explain any framework-specific presentation.

SRC-01 · Recommendations of the Taskforce on Nature-related Financial Disclosures - TNFD (Version 1.0, September 2023). https://tnfd.global/wp-content/uploads/2023/08/Recommendations_of_the_Taskforce_on_Nature-related_Financial_Disclosures_September_2023.pdf

SRC-02 · TNFD Disclosure Recommendations webpage - TNFD (Current webpage checked 3 August 2026). https://tnfd.global/recommendations/

SRC-05 · Interoperability mapping between the GRI Standards and the TNFD Recommendations and metrics - accompanying guide - GRI and TNFD (July 2024). https://www.globalreporting.org/media/2bocmv0b/240729-accompanying-guide.pdf

SRC-07 · GRI 101: Biodiversity 2024 - Global Sustainability Standards Board / GRI (Published January 2024; effective 1 January 2026). https://www.globalreporting.org/pdf.ashx?id=24534

SRC-16 · IFRS S1 General Requirements for Disclosure of Sustainability-related Financial Information - IFRS Foundation / ISSB (Issued June 2023; effective for periods beginning on or after 1 January 2024). https://www.ifrs.org/issued-standards/ifrs-sustainability-standards-navigator/ifrs-s1-general-requirements/

Publication status: Source-grounded publication-ready draft - human technical sign-off pending. This article is educational material and does not replace the official TNFD, GRI or IFRS sources, legal advice or assurance procedures.