ISSB Proposes IFRS Nature Practice Statement

The International Sustainability Standards Board (ISSB) announced on Apr 23, 2026 that it will propose an IFRS Practice Statement focused on nature-related disclosures, a move that would extend the board's remit beyond climate into biodiversity and ecosystem dependencies (ISSB press release, Apr 23, 2026). The proposal follows the ISSB's publication of IFRS S1 and S2 in June 2023 for general and climate-related disclosures and represents the next formal attempt to standardize reporting on non-climate environmental risks that are material to enterprise value. The statement will be targeted at entities applying IFRS accounting standards; over 140 jurisdictions currently permit or require IFRS financial reporting frameworks (IFRS Foundation, 2024), which amplifies potential reach and compliance complexity. Market participants — from asset managers to extractive companies and banks — are watching for both the scope of the Practice Statement and the consultation timetable, since nature-related disclosures intersect with capital allocation, regulatory expectations, and risk modelling.

Context

The ISSB's proposal signals a shift in the sequencing of sustainability standard-setting that began in earnest at COP26 in 2021 when the IFRS Foundation formally announced the creation of the ISSB. Since then, the board delivered IFRS S1 and S2 in June 2023, prioritizing climate and enterprise-value-focused sustainability reporting. Nature-related risks have been addressed in parallel forums — notably the Taskforce on Nature-related Financial Disclosures (TNFD), launched in 2023 — but remain less mature in terms of standardized, globally-recognized practice guidance. The ISSB proposal therefore responds to an investor demand for comparability across environmental topics and to rising regulatory activity in multiple jurisdictions that have started to require nature or biodiversity-related disclosures.

Three specific data points illustrate the scale and drivers behind the ISSB move. First, the announcement date is Apr 23, 2026 (ISSB press release). Second, the IFRS S1/S2 package was finalized in June 2023 (IFRS Foundation), establishing the precedent for a phased standards program. Third, the World Economic Forum estimated in 2020 that up to US$44 trillion of economic value generation is moderately or highly dependent on nature (WEF, 2020), underscoring why investors and regulators treat biodiversity as a material financial risk. These figures help explain the urgency behind harmonizing disclosures: the economic exposure is large and existing reporting is fragmented.

The proposed Practice Statement is unlikely to be a standalone mandatory standard initially; practice statements are typically interpretative and designed to guide application rather than create new accounting rules. Expect the ISSB to frame the document as guidance that clarifies how to apply materiality concepts and integrate nature-related impacts and dependencies into enterprise-value-focused disclosures. Corporate preparers and auditors will need to assess the overlap with local reporting rules and voluntary frameworks, and reconcile guidance from TNFD and other ecosystem-focused initiatives with the ISSB approach. For investors, harmonization can reduce data collection costs and improve comparability across portfolios if the statement gains adoption.

Data Deep Dive

A precise reading of the ISSB announcement shows the board intends to consult publicly on the scope and content of the Practice Statement; historically, the ISSB's public consultations range from 90 to 180 days depending on complexity (IFRS Foundation consultation precedent, 2021-2024). The June 2023 S1/S2 package underwent a 120-day consultation period prior to finalization, which sets a plausible benchmark for the nature-focused consultation period. If the ISSB follows that model, a proposal issued in late Q2 2026 could translate into a final Practice Statement in 2027, assuming standard comment periods and redeliberation cycles.

Adoption metrics for climate disclosures offer a comparator. As of 2024, the adoption of TCFD-style climate disclosures rose year-over-year, with regulatory mandates in the EU, the UK, and parts of Asia accelerating uptake; by contrast, structured nature disclosures are lagging single-digit percentage points behind climate in terms of mandatory requirements. The comparison underscores a material timing difference: climate disclosure infrastructure (scenario analysis, emissions inventories) benefitted from earlier market development and standardization, whereas nature-related reporting requires new baselines for dependencies, metrics, and valuation approaches.

Market data also shows a sectoral concentration of exposure. Agriculture, forestry, fisheries, mining, and certain chemicals producers have the highest direct dependence on natural capital and are thus likely to face the most immediate reporting burden. Financial institutions with large commodity-linked loan books and asset managers with listed equity exposures to primary-sector firms will encounter portfolio-level implications. If regulators in major capital markets reference the ISSB Practice Statement as part of local rules, the compliance universe could expand from a few thousand large-cap issuers to tens of thousands of entities that report under IFRS. Investors should expect increased cross-sectional data availability but also higher short-term costs for data collection and assurance.

Sector Implications

Commodity producers and agribusinesses will be first-order affected by a nature Practice Statement because their operations directly alter and depend on ecosystems. For extractive companies, requirements to disclose biodiversity-related impacts — measured against baselines and, potentially, monetary valuation frameworks — would increase transparency but also expose legacy environmental liabilities. Banks and insurers underwriting these sectors may be forced to recalibrate credit and underwriting models to reflect disclosed nature-related transition and physical risks, which could feed into risk-weighted asset calculations and insurance pricing in affected jurisdictions.

Asset managers and institutional investors face demand-side pressure to integrate nature-related metrics into portfolio construction and stewardship. Passive funds that track broad market indices may contend with larger engagement obligations and index rebalancing if nature disclosures unveil previously hidden risks. Active managers with sustainability mandates will leverage improved comparability to refine screening, engagement and valuation assumptions. Pension funds and insurers, given long-term liabilities, may be particularly sensitive to any evidence that nature-related shocks materially reprice long-duration assets.

Regulators and auditors will grapple with assurance and standardization challenges. The feasibility of third-party assurance for nature metrics is still developing; unlike greenhouse gas inventories, biodiversity metrics lack consensus on universal units. Audit firms will need to develop methodologies and data pipelines, creating a new market for ecosystem assessment firms and geospatial data providers. Policymakers could move faster than private markets in mandating disclosures, as seen in the EU's Corporate Sustainability Reporting Directive, and the ISSB Practice Statement will be an input into these local regimes.

Risk Assessment

Operationalizing nature-related disclosures introduces measurement risk, model risk, and litigation risk. Measurement risk arises from inconsistent baseline data, heterogeneous local biodiversity valuations, and limited historic datasets; companies operating in multiple jurisdictions will face reconciling local ecosystem classifications with any global taxonomy the ISSB references. Model risk is amplified when companies or investors convert biodiversity impacts into monetary terms for valuation models — such conversions can be sensitive to chosen discount rates, geographic scope, and ecosystem service valuation methods.

Litigation and reputational risk could increase as transparent disclosures reveal gaps between corporate claims and on-the-ground impacts. Investors may use disclosed data to challenge management assertions about sustainability or to pursue stewardship actions. Conversely, incomplete disclosures could attract regulatory scrutiny or enforcement in jurisdictions increasingly focused on nature-related harms.

Compliance cost is the near-term risk for smaller issuers and mid-market firms. If a Practice Statement becomes de facto required because major jurisdictions reference it, smaller entities may face disproportionate administrative burdens. That said, markets could see productivity gains over time if standardization reduces heterogeneity in reported metrics and lowers due-diligence costs for portfolio managers.

Fazen Markets Perspective

Fazen Markets assesses the ISSB move as strategically significant for the maturation of nature-related financial risk analysis, but not a sudden shock to capital markets. Our contrarian view is that the initial market reaction will be muted — reflecting data scarcity and implementation timelines — but the incremental value will compound within credit and pricing models over a multi-year horizon. Where investors underestimate the long tail of biodiversity dependencies is at the portfolio level; systemic impacts (e.g., supply chain disruptions for food and agriculture) could propagate slowly yet materially into valuations.

We also see an opportunity for data differentiation. Firms that invest in building robust nature-analytics capabilities early could convert a compliance cost into a competitive advantage by improving risk-adjusted valuation and by executing proactive engagement strategies. This is not a uniform play: the benefits will cluster in sectors with high ecosystem exposure or in asset managers with concentrated commodity-linked positions. For diversified index investors, the immediate impact is likely to be in stewardship demands rather than in portfolio reweighting.

Finally, investors should watch policy interplay. The ISSB's Practice Statement will not operate in a vacuum. Local rules — particularly in the EU and the UK — may reference or integrate parts of the ISSB guidance. Market participants that map the interplay between ISSB guidance, TNFD recommendations, and jurisdictional mandates will be better positioned to anticipate compliance timelines and to avoid regulatory arbitrage.

Outlook

Assuming a standard ISSB consultation and redeliberation cycle, the Practice Statement could advance through consultation in H2 2026 and move toward finalization in 2027, although national endorsement processes could lag. The pace of adoption will depend on whether major jurisdictions explicitly reference the ISSB guidance in regulation; a decision by the EU, the UK, or China to align local rules with the Practice Statement would materially accelerate uptake. Meanwhile, market participants should expect parallel development of commercial data products to fill immediate gaps in biodiversity metrics.

Over a medium-term horizon (three to five years), the primary market impact will be informational: better disclosure will reduce uncertainty and allow creditors and investors to price nature-related dependencies with higher confidence. Sector repricing — if it occurs — is likely to happen unevenly and will reflect the quality of firms' transition plans and disclosed mitigation measures. Secondary effects could include shifts in capital allocation toward lower nature-exposure activities, and increased M&A scrutiny where biodiversity liabilities become more visible.

In practical terms, corporate preparers and asset managers should map their nature exposures, pilot disclosure workflows consistent with emerging ISSB guidance, and engage with standard-setting consultations. Early harmonization efforts will reduce future restatement risk and lower the cost of external assurance over time. For more on how disclosure frameworks evolve and how they intersect with markets, see our coverage of the topic and guidance on integrating sustainability data into valuation models at topic.

Bottom Line

The ISSB's proposal for an IFRS Practice Statement on nature-related disclosures (announced Apr 23, 2026) marks an important step toward standardizing biodiversity reporting and will incrementally increase transparency and compliance costs for nature-dependent sectors. Investors should monitor consultation details and jurisdictional adoption to assess timing and portfolio implications.

Disclaimer: This article is for informational purposes only and does not constitute investment advice.

FAQ

Q: What is the expected consultation timeline for the ISSB Practice Statement?

A: While the ISSB has not published a definitive timeline beyond its Apr 23, 2026 announcement, precedent suggests a public consultation window in the 90–180 day range; the IFRS S1/S2 process used a 120-day consultation (IFRS Foundation, 2023). Practically, market stakeholders should prepare for consultations in H2 2026 and potential finalization in 2027, subject to redeliberation.

Q: How does the Practice Statement relate to TNFD guidance?

A: The Practice Statement will likely overlap with TNFD on conceptual approaches to dependencies and impacts, but the ISSB's framing is enterprise-value focused and intended for entities reporting under IFRS. Investors will need to reconcile TNFD's operational guidance with an IFRS-focused reporting lens; firms that map both frameworks will reduce future compliance friction.

Q: Will the new guidance immediately affect valuations and credit ratings?

A: Not immediately. The short-term effect will be disclosure and data improvements; material valuation or ratings changes are more probable once datasets mature and become auditable. However, the visibility of previously hidden risks could trigger targeted revisions in sectors with concentrated ecosystem exposures.