Governance
ISSA 5000
Definition
ISSA 5000, General Requirements for Sustainability Assurance Engagements, is the International Auditing and Assurance Standards Board's dedicated standard for assuring sustainability information. Approved in September–November 2024, it covers the end-to-end engagement — from acceptance to reporting — for both limited and reasonable assurance, is framework-neutral, and applies to all sustainability topics for single entities and groups.
References
Scope, framework neutrality, limited/reasonable structure, ISAE 3410 withdrawal
Approval and certification dates, effective date 15 December 2026, adoption examples
Overview
What it means
ISSA 5000 moves sustainability assurance out from under the general ISAE 3000 umbrella into a purpose-built standard. It addresses the distinctive difficulties of sustainability information: value-chain data, estimates and forward-looking statements, double materiality, group reporting and qualitative disclosures, while requiring ISQM 1-level quality management and IESBA-equivalent independence.
How it is used
Practitioners will apply it to assure reports prepared under any suitable criteria — ISSB standards, ESRS, GRI, SEC rules or entity-developed criteria — and issue limited, reasonable or combined conclusions. ISAE 3410 (GHG statements) is withdrawn once ISSA 5000 takes effect; early application is permitted.
Why it matters
As mandatory sustainability assurance spreads (EU CSRD and national equivalents), a single global baseline standard is intended to keep assurance quality consistent and ESG disclosures credible and comparable.