SOC 2 vs ISO 27001
Side-by-side comparison of SOC 2 and ISO 27001 — scope, cost, timeline, overlap, and which to pursue first.
Key differences
| Dimension | SOC 2 | ISO/IEC 27001 |
|---|---|---|
| Governing body | AICPA (US) — examination against Trust Services Criteria by a licensed CPA firm | ISO/IEC (international) — certification against ISO/IEC 27001 by an accredited certification body |
| Output | Attestation report (SOC 2 Type I or Type II) describing the system and CPA opinion — typically shared under NDA | Certificate confirming an ISMS conforms to ISO/IEC 27001 — often more publicly referenceable in marketing and tenders |
| Mandatory? | No statutory mandate for most SaaS — almost entirely customer- and contract-driven | No universal legal mandate — but frequently contractual or tender-required in EU, UK, and many APAC deals |
| Control prescription | Principles-based Trust Services Criteria — you design controls that meet the criteria; the CPA tests design (and operation for Type II) | Risk-based ISMS — you assess risk, select Annex A controls via a Statement of Applicability, and operate the management system |
| Geographic recognition | Strong default expectation in US/Canada B2B SaaS procurement and many North American enterprises | Strong internationally — especially EU, UK, and APAC markets where certification language appears in RFPs |
| Timeline (first report/cert) | Roughly 3–9 months typical to Type II readiness if foundations exist; Type I can be faster for design-only milestones | Roughly 6–18 months typical to first certification, depending on ISMS maturity, scope, and stage-1/stage-2 scheduling |
| Cost (all-in, first year) | About $30K–$80K typical indicative all-in for many mid-market SaaS programs (highly scope-dependent) | About $25K–$70K typical indicative all-in for many first certifications (scope, geography, and CB fees vary widely) |
| Ongoing renewal | New Type II period and report each year (or as buyer cadence requires); bridge letters may cover gaps between reports | Annual surveillance audits plus full recertification on roughly a three-year cycle |
| Public signal | Restricted-use report — usually shared under NDA or via a trust portal with access controls | Certificate often cited publicly; detailed SoA and audit findings remain internal or selectively shared |
Control overlap
Access control, change management, logging and monitoring, risk assessment, vendor management, and incident response overlap heavily at the technical and process layer. Teams that sequence SOC 2 and ISO/IEC 27001 well reuse the same IdP, change pipelines, asset inventory, and evidence stores. Expect substantial reuse of control operation — but documentation shape and audit cadence still differ: a CPA attestation against Trust Services Criteria versus an ISMS certification with Annex A selection, SoA justification, and management-system clauses (context, leadership, continual improvement). Crosswalks are aids, not proof that requirements are identical.
Sequencing advice
US-first SaaS commonly pursues SOC 2 Type II first to unblock North American enterprise deals, then adds ISO/IEC 27001 when EU/UK/APAC contracts require a certificate. If early revenue depends on ISO language in tenders, reverse the order or start ISMS foundations in parallel. Running both programs together is viable when shared control owners, a single evidence pipeline, and one risk register feed both audits — avoid two disconnected gap assessments and duplicate policy trees. Inside SOC 2, decide Type I vs Type II intentionally (see /compare/soc-2-type-1-vs-type-2). Use /costs/soc-2/overview for program spend context before locking dual-framework budgets.