ISO 27001 and SOC 2 are different in form — one is a certifiable standard with an ISMS, the other an attestation against trust services criteria — but they overlap heavily in substance. Most of the evidence that satisfies one will, with light translation, satisfy the other.
Companies that run them separately collect the same access reviews, the same change logs and the same policies twice. Run them as one program and the duplication disappears.
Where they meet
Access control, change management, risk assessment, vendor management, incident response, and HR security all appear in both. The underlying control is identical; only the reference and the wording differ.
Map controls once
Build a single control set and map each control to both ISO 27001 Annex A and the relevant SOC 2 criteria. One control, two references. This is the same control-library-first approach that pays off across every framework.
Collect evidence once
Pull each piece of evidence a single time into one layer, and tag it with both frameworks. An access review collected for ISO is the same artefact SOC 2 wants — it should never be gathered twice.
SOC 2 Type II tests evidence over a period, while ISO certification audits look at the system at a point in time with surveillance after. Collect continuously and both models are satisfied; collect at the last minute and SOC 2 Type II will expose the gap.
Mind the differences
They are not identical. ISO 27001 requires a formal ISMS, a risk methodology and a Statement of Applicability; SOC 2 centres on the trust services criteria you select (security, availability, confidentiality, and so on). Map the overlap, but respect the parts unique to each.
Run them in parallel
Sequence the work so one effort feeds both: define controls, wire continuous evidence, then schedule the ISO audit and the SOC 2 observation window around the same control set. A solid Statement of Applicability doubles as a map into your SOC 2 controls.
Key takeaways
- ISO 27001 and SOC 2 overlap heavily in substance, differ in form.
- Map one control set to both Annex A and the trust services criteria.
- Collect evidence once, tagged for both — continuously, to satisfy SOC 2 Type II.
- Respect what is unique: the ISMS and SoA for ISO, the criteria selection for SOC 2.
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This article is general guidance, not legal advice. Verify obligations and deadlines for your organisation with qualified counsel.