International Standard on Sustainability Assurance 5000 (ISSA 5000)
ISSA 5000 assurance, ready before fieldwork.
ISSA 5000 is the global baseline for limited and reasonable assurance over sustainability information. Carbon Impact helps reporting teams build the controlled data, documented judgements, and traceable evidence an independent assurance provider will need to examine.
- Global effective date begins 15 December
- 2026
- Limited and reasonable assurance levels
- 2
- Suitable reporting framework or criteria
- Any
- All sustainability topics supported
- E–S–G
What your assurance provider will examine
Suitable criteria and a clear scope
The assured information must be measured or evaluated against suitable criteria, with the reporting boundary, period, topics, and level of assurance clearly defined.
Materiality and reporting judgements
Quantitative and qualitative disclosures, estimates, omissions, and aggregation decisions need a reviewable rationale tied to the information needs of intended users.
Reliable processes and evidence
Practitioners assess risks of material misstatement and obtain evidence over data, disclosures, estimates, forward-looking information, and the controls that produced them.
Governance and accountability
Management remains responsible for the sustainability information. Clear ownership, review controls, written representations, and communication with those charged with governance matter throughout the engagement.
How Carbon Impact helps.
Map every assured disclosure
Connect each metric and narrative disclosure to its criteria, owner, boundary, method, review control, and evidence before the assurance request list arrives.
Preserve a traceable evidence chain
Keep source files, calculation versions, factors, assumptions, approvals, and changes together so samples can be traced from disclosure to source and back again.
Run a controlled reporting close
Assign responsibilities, validate completeness, resolve exceptions, freeze approved versions, and monitor readiness across entities and reporting topics in one workspace.
Go deeper in the Journal
Browse all guidesEU ISSA 5000 and CSRD: Building One Assurance-Ready Evidence System
November 16, 2026 · 6 min readRegulationNew Zealand ISSA (NZ) 5000: The Climate Assurance Transition
November 12, 2026 · 6 min readRegulationPhilippines PSSA 5000: Sustainability Assurance Readiness
November 9, 2026 · 6 min readRegulationThailand ISSA 5000: The Sustainability Assurance Roadmap
November 5, 2026 · 6 min readRegulationIndonesia ISSA 5000: Adoption and Sustainability Assurance Readiness
November 2, 2026 · 6 min readRegulationMalaysia ISSA 5000: Preparing for the Sustainability Assurance Framework
October 29, 2026 · 6 min readRegulationAustralia ASSA 5000: A Climate Assurance Readiness Guide
October 26, 2026 · 6 min readRegulationHong Kong HKSSA 5000: Sustainability Assurance Readiness
October 22, 2026 · 6 min readRegulationSingapore ISSA 5000: Preparing for Climate Assurance
October 19, 2026 · 6 min readRegulationJapan ISSA 5000: The Sustainability Assurance Roadmap
October 15, 2026 · 6 min readRegulationISSA (UK) 5000: Sustainability Assurance Readiness for UK Companies
October 12, 2026 · 6 min readRegulationISSA 5000 in the United States: California and Voluntary Assurance
October 8, 2026 · 6 min readRegulationCanada CSSA 5000: A Sustainability Assurance Readiness Guide
October 5, 2026 · 6 min readFundamentalsSustainability Assurance Readiness: A Practical Guide to ISSA 5000
May 21, 2026 · 3 min readBring your ISSA 5000 reporting into one connected, reviewable workflow.
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