ISO 27001 vs SOC 2: certification versus attestation
How a certifiable ISMS differs from an AICPA attestation report.
ISO 27001 vs SOC 2 at a glance
| Feature | ISO 27001 | SOC 2 |
|---|---|---|
| What it is | International standard for a certifiable Information Security Management System (ISMS) | AICPA attestation engagement reported by a CPA firm |
| Controls / criteria | Clauses 4-10 plus Annex A:2022 (93 controls in 4 themes) | Trust Services Criteria (Security mandatory; Availability, Processing Integrity, Confidentiality, Privacy optional) |
| Output | Accredited certificate of conformity | An auditor's report and opinion — there is no pass/fail certificate |
| Report types | Single certification (no Type 1 / Type 2 split) | Type 1 (design at a point in time) or Type 2 (operating effectiveness over a period) |
| Cycle | Three-year certificate with annual surveillance audits and recertification | Typically refreshed every 12 months with a new report period |
| Who audits | Accredited certification body | Licensed CPA / AICPA firm |
| Primary market signal | Recognised globally, strong in the EU and tenders | Default expectation for US SaaS buyer due diligence |
Which to do first if you sell into both the EU and US
If your near-term pipeline is US SaaS buyers, a SOC 2 Type 1 demonstrates control design quickly, then a Type 2 proves the controls operated over a 3-6 month window. If EU enterprise tenders or regulated buyers dominate, ISO 27001 certification is the recognised signal and underpins NIS 2 and GDPR work. The practical path for companies selling into both: build one control set, map it once, and harvest two outputs. The ISMS clauses and Annex A controls overlap heavily with the Security Trust Services Criteria, so a single well-run programme can carry both. Sequence by whichever buyer closes revenue first; the second framework then becomes a mapping exercise rather than a fresh build.
ISO 27001 implementation guidance →How ISMS Copilot helps with both
- Generates ISO 27001 Annex A:2022 policies and a Statement of Applicability
- Maps your controls to SOC 2 Trust Services Criteria so evidence is reused
- Prepares Type 1 and Type 2 readiness alongside ISO certification audits
Frequently Asked Questions
Does SOC 2 give you an ISO 27001 certificate?
No. They are separate regimes. SOC 2 produces a CPA attestation report; ISO 27001 produces an accredited certificate. Neither one certifies you for the other, though control evidence overlaps substantially and can be reused.
Is SOC 2 Type 2 equivalent to ISO 27001?
Not formally. SOC 2 Type 2 reports on whether controls operated effectively over a period; ISO 27001 certifies a management system against an international standard. Many buyers accept either, but they are different deliverables with different audiences.
Which is cheaper or faster?
A SOC 2 Type 1 is usually the fastest first signal because it assesses design at a point in time. ISO 27001 takes longer initially but runs on a predictable three-year cycle with lighter annual surveillance audits.
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