Sustainability Assurance Arrives: What Caribbean Boards Must Know About ISSA 5000, IFRS S1 and IFRS S2

Of all the changes reshaping audit and assurance in this decade, none will land harder on Caribbean boards than the one this article addresses. Until very recently, sustainability reporting in the Caribbean was a voluntary activity — a corporate social responsibility statement, an annual report chapter on community engagement, a chairman’s narrative on environmental stewardship. The reporting was earnest, sometimes good, and rarely assured. The assurance, when it occurred, was conducted under engagement standards designed for general-purpose assurance — ISAE 3000 most commonly — and the practitioner population doing the work was small.

That era is ending faster than most Caribbean boards realise. Three developments, arriving simultaneously, are changing the picture. The International Auditing and Assurance Standards Board has issued ISSA 5000 — General Requirements for Sustainability Assurance Engagements — the profession’s first standalone standard on sustainability assurance. The International Sustainability Standards Board has issued IFRS S1 and S2 — the global baseline for sustainability-related and climate-related financial disclosures, adopted or being adopted in jurisdictions worldwide. And the European Union’s Corporate Sustainability Reporting Directive is now reaching into the value chains of European-trading entities, including Caribbean exporters, suppliers, and partners.

For Caribbean boards, the question is no longer whether sustainability assurance is coming. It is when, in what form, and at what level of preparedness. This article unpacks ISSA 5000, IFRS S1 and S2, the proximate Caribbean implications, and what audit committee chairs should ask of their auditor before the next reporting cycle begins.

What Just Happened in the Assurance Profession

ISSA 5000 was approved by the IAASB in September 2024 and issued in November 2024, with effective application for sustainability information for periods beginning on or after 15 December 2026. It is not a small standard. It runs to several hundred pages of requirements and application material and represents the profession’s considered answer to the question that has been unanswered for over a decade: what does “assurance over sustainability information” actually require?

Three things about ISSA 5000 matter at a board level. First, the standard is framework-agnostic — it can be applied to sustainability information prepared under IFRS S1 and S2, the European ESRS, the Global Reporting Initiative’s GRI Standards, or any other recognised framework. Second, it contemplates both limited and reasonable assurance engagements, with substantially different evidence requirements and conclusions. Third, it is profession-agnostic — it is designed to be applied by professional accountants and by other assurance practitioners qualified under their own regulatory regimes.

Alongside ISSA 5000, the International Ethics Standards Board for Accountants has issued the International Ethics Standards for Sustainability Assurance (IESSA), establishing independence and ethical requirements for sustainability assurance practitioners that mirror, in spirit, the audit independence regime. The combination — ISSA 5000 plus IESSA — completes the assurance profession’s answer.

“ISSA 5000 is the profession’s considered answer to a question that has been unanswered for over a decade: what does assurance over sustainability information actually require?”

The Reporting Side  |  IFRS S1 and S2

Assurance only matters where there is reporting to assure. The most consequential development on the reporting side is the issuance of IFRS S1 — General Requirements for Disclosure of Sustainability-related Financial Information — and IFRS S2 — Climate-related Disclosures — by the International Sustainability Standards Board. The two standards became effective for annual reporting periods beginning on or after 1 January 2024 and have been adopted, or are being adopted, in jurisdictions across the world.

IFRS S1 establishes the general requirements: that an entity shall disclose information about sustainability-related risks and opportunities that could reasonably be expected to affect the entity’s prospects. IFRS S2 then applies that framework specifically to climate-related risks and opportunities, with detailed disclosure requirements on governance, strategy, risk management, and metrics and targets. The disclosures are required to be made on a basis consistent with the related financial statements, in the same reporting package, for the same reporting period.

For a Caribbean entity reporting under IFRS, IFRS S1 and S2 are part of the IFRS ecosystem. Jamaica has, through the Institute of Chartered Accountants of Jamaica and the Jamaica Stock Exchange, signalled a transition pathway toward adoption. Other Caribbean jurisdictions are at various stages of the same conversation. The trajectory is clear. The timing varies.

The Pressure From Outside the Region

Even where the local jurisdiction has not yet mandated sustainability assurance, the pressure is already arriving from outside the region. Three vectors are the most consequential for Caribbean entities:

• European trading exposure under CSRD. The European Union’s Corporate Sustainability Reporting Directive requires large European entities to obtain assurance over their sustainability reporting under the ESRS framework. Those entities are now requiring their value chain partners — including Caribbean suppliers, exporters, and joint venture partners — to provide consistent sustainability information that the European entity can use, and in some cases assure. A Caribbean entity that supplies a European customer is increasingly being asked for sustainability data; sometimes for assured sustainability data.
• Multilateral lender expectations. The IDB, the World Bank, the European Investment Bank, the Caribbean Development Bank, and other multilateral lenders are increasingly attaching sustainability-related conditions to their financing — disclosure obligations, third-party verification of certain metrics, alignment with specific sustainability frameworks. Caribbean entities accessing multilateral financing are encountering these conditions earlier in the loan lifecycle than was true even three years ago.
• Regional listing and capital markets. The Jamaica Stock Exchange, the Trinidad and Tobago Stock Exchange, and the Barbados Stock Exchange — alongside regional regulators — have begun signalling sustainability disclosure expectations for listed entities. The pace varies. The direction does not.

“Even where local rules have not yet mandated sustainability assurance, the pressure is already arriving from outside the region — through European customers, multilateral lenders, and regional listing requirements.”

What ISSA 5000 Actually Requires

For audit committee chairs evaluating what sustainability assurance will look like in practice, five elements of ISSA 5000 matter at a board level.

• Engagement acceptance discipline. The practitioner must accept the engagement only if it has the competencies, capabilities, and resources to perform it — including, critically, the ability to engage subject-matter experts where the assurance subject matter requires it. Sustainability assurance involves climate science, social metrics, supply chain data, and emissions measurement; competent practitioners must access those competencies.
• Risk assessment at the assertion level. Just as a financial statement audit identifies risks of material misstatement by assertion, a sustainability assurance engagement identifies risks of material misstatement at the assertion level for each material category of sustainability information. The risk-based discipline is the same; the assertions and subject matter are different.
• Evidence requirements differ by assurance level. ISSA 5000 contemplates limited assurance and reasonable assurance. Limited assurance — the predominant level for sustainability engagements at present — requires the practitioner to obtain sufficient appropriate evidence to express a conclusion that nothing has come to the practitioner’s attention indicating the information is materially misstated. Reasonable assurance — the standard for financial statement audits — requires substantially more evidence and supports a positively worded opinion. The two are not interchangeable, and the assurance report must be explicit about which is given.
• Materiality is sustainability-specific. Materiality under ISSA 5000 is not financial statement materiality. It is determined in the context of the sustainability information and the intended users of the assurance report. A misstatement that is immaterial to the financial statements may nonetheless be material to the sustainability information.
• Reporting requirements are explicit. The assurance report must clearly identify the criteria against which the sustainability information was prepared, the assurance level provided, the basis of conclusion, and any restrictions on use. The report is intended to be read alongside the sustainability information; the two together inform the user.

What Caribbean Boards Must Prepare For

For an audit committee chair preparing for the arrival of sustainability assurance, four preparation tasks are concrete and worth starting now, regardless of when local adoption occurs.

• Take stock of what your entity already discloses. Most Caribbean entities of any scale already disclose sustainability information somewhere — in the annual report, on the website, in lender filings, in customer questionnaires. That dispersed disclosure is the baseline from which assured reporting will be built. Mapping it is the first step.
• Identify the framework you will likely report under. For most Caribbean entities, the answer will be IFRS S1 and S2 — because the entities already report under IFRS, because the Institute of Chartered Accountants of Jamaica is on this trajectory, and because the regional accounting framework will follow. Entities with European trading exposure may also face ESRS expectations through the value chain.
• Build the data infrastructure. Sustainability information is data. Greenhouse gas emissions, water use, waste, employee metrics, supplier data — all of it must be measured, recorded, and reconciled. Most Caribbean entities are not yet collecting this data with the rigour an assurance engagement will require. The earlier the data infrastructure is built, the lower the first-year cost of assurance.
• Engage the conversation with your auditor and your sustainability advisor. The financial statement auditor and the sustainability assurance practitioner may be the same firm or different firms, depending on the entity’s position. Either way, the conversation about how the two engagements relate — methodology, materiality, evidence — should begin before the first assured reporting cycle, not during it.

Four Questions the Audit Committee Should Ask

• What is our current sustainability disclosure baseline, and where is the gap between what we disclose today and what an IFRS S1 and S2 disclosure would require? You are asking management to take stock honestly before the standard arrives.
• What is our exposure to sustainability assurance expectations from outside the region — European customers, multilateral lenders, regional listing requirements — and on what timeline? The answer reveals whether the timeline for preparation is comfortable or already short.
• Who will be our sustainability assurance practitioner, and what should the relationship between that engagement and our financial statement audit look like? An integrated approach is usually more efficient; a separated approach may be more independent. The decision is the audit committee’s.
• What is the data infrastructure project we need to commission this year to be ready for assured reporting in two to three years? Sustainability data is not built in the final quarter before reporting; it is built over multiple cycles.

How Dawgen Global Approaches Sustainability Assurance

Within D·ASSURE™, sustainability assurance lives in the R pillar — Reporting & Insight — with subject-matter expertise drawn from the firm’s broader sustainability and risk practices, including the DESGAF™ framework for environmental, social, and governance advisory engagements. The firm’s approach to sustainability assurance is grounded in the same disciplines that govern its financial statement audits: documented engagement acceptance under ISQM 1 considerations, risk-based engagement planning, evidence sufficient to the assurance level expressed, and reporting that allows the user to interpret the conclusion in context.

Dawgen Global engages with Caribbean entities at three stages of the sustainability assurance journey. For entities not yet reporting, the firm provides advisory engagements scoping the data infrastructure, the framework selection, and the disclosure pathway. For entities preparing for first-year assured reporting, the firm provides readiness assessments under DESGAF™ and indicative pre-assurance reviews. For entities ready for assured reporting, the firm provides limited or reasonable assurance engagements under ISSA 5000 against the applicable framework — typically IFRS S1 and S2 for Caribbean entities reporting under IFRS, ESRS for entities with European obligations, and other frameworks where the assurance is required.

The firm’s position on sustainability assurance is the same position it takes across the assurance profession: that the engagement must be performed under a competent methodology, by practitioners qualified to do the work, with documentation sufficient to withstand the scrutiny of users, regulators, and — where applicable — the audit committee that commissioned the engagement.

What’s Next in the Series

Article 10 takes up a question that has been quietly present throughout this series: why an independent, integrated audit firm operating across the Caribbean is, increasingly, the right answer for entities that need methodology, specialist depth, and Caribbean-aware leadership all in one place. Where the previous nine articles have addressed what the modern audit must do, the next addresses who is best placed to do it.

If you are an audit committee chair, CFO, sustainability lead, or director and would like a confidential briefing on what ISSA 5000 and IFRS S1 / S2 mean for your entity, or a readiness assessment of your current sustainability disclosure and data infrastructure under DESGAF™, the Dawgen Global Audit & Assurance team welcomes the conversation. Write to [email protected] or visit dawgen.global.

About the Author

Dr. Dawkins Brown is the Executive Chairman and Founder of Dawgen Global, an independent, integrated multidisciplinary professional services firm headquartered in New Kingston, Jamaica, with operations across more than fifteen Caribbean territories. He writes weekly on Caribbean governance, audit, and assurance matters through Caribbean Boardroom Perspectives and The Caribbean Advisory Brief.

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