ISO/IEC 27001 vs SOC 2: Certification or Attestation, Controls, Cost, and Which One You Need
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The core difference is what you walk away with: ISO/IEC 27001 is an international standard you get certified against by an accredited certification body, while SOC 2 is an independent examination by a licensed CPA firm that produces an attestation report, not a certificate. ISO 27001 is the dominant credential for global and EU/UK enterprise deals; SOC 2 is the default for US and North American B2B SaaS. If your buyers are international, lean ISO 27001; if they are US enterprises sending vendor security questionnaires, they are usually asking for SOC 2 — and many companies end up needing both.
Related toolkits: ISO 27001 + SOC 2 Dual Toolkit ($149) · ISO 27001 Complete Toolkit ($99)
ISO/IEC 27001 vs SOC 2 at a glance
| ISO/IEC 27001 | SOC 2 | |
|---|---|---|
| Type | Certifiable international standard for an Information Security Management System (ISMS) | Attestation report on controls — a report, not a certificate |
| Issued / verified by | Accredited certification body (e.g. UKAS- or ANAB-accredited), after a Stage 1 + Stage 2 audit | Independent licensed CPA firm, under the AICPA's SSAE 18 (AT-C 205) attestation standard |
| Underlying standard | ISO/IEC 27001:2022 (requirements in clauses 4-10, plus Annex A reference controls) | AICPA Trust Services Criteria, examined under the SSAE 18 attestation standard |
| Controls | 93 reference controls in Annex A (37 Organizational, 8 People, 14 Physical, 34 Technological); you select the applicable ones and justify each inclusion or exclusion in a Statement of Applicability | No fixed control list — you design your own controls mapped to the five Trust Services Criteria categories (Security is mandatory; Availability, Confidentiality, Processing Integrity, and Privacy are optional) |
| Geography / recognition | Globally recognized; the leading credential outside North America (EU, UK, APAC, global enterprise) | Predominantly US and North American, though increasingly recognized internationally; the default ask in US enterprise procurement |
| Validity & renewal | Certificate typically valid ~3 years, with annual surveillance audits and recertification at the end of the cycle | Report covers a single point in time (Type I) or an observation window of roughly 3-12 months (Type II); typically renewed with a new Type II each year |
| Best for | Companies selling to international or EU/UK enterprises, or that want a recognizable certificate to display | US/North American B2B SaaS, cloud platforms, and service organizations whose deals stall in vendor security review |
| Indicative cost (audit/exam only) | ~$5,000-$15,000+ for an SME (Stage 1 + Stage 2), plus documentation and implementation effort | ~$5,000-$60,000+ for the CPA examination depending on scope and report type, plus readiness work |
Key differences
The deepest difference is the deliverable and who stands behind it. ISO/IEC 27001 results in a certificate issued by an accredited certification body that audits a working ISMS against the standard's clauses and the Annex A controls you selected, whereas SOC 2 produces an attestation report written and signed by a licensed CPA firm about controls you designed yourself against the AICPA Trust Services Criteria.
That drives the second difference: ISO 27001 gives you a fixed catalog of 93 reference controls to choose from and a Statement of Applicability to justify inclusions and exclusions, while SOC 2 prescribes criteria but no enumerated control list, so two SOC 2 reports can describe very different control sets. The third is reach — ISO 27001 is the international lingua franca of security trust, while SOC 2 is the credential US enterprise buyers most often demand.
Importantly, the two overlap heavily at the control level (access control, change management, incident response, risk assessment, vendor management), which is why a single, well-built program can support both.
Which should you choose?
Choose ISO/IEC 27001 if you sell into international, EU, or UK markets, if RFPs ask for a recognizable certificate, or if you want a structured management system you can mature over time. Choose SOC 2 if your buyers are US or North American enterprises whose security teams send vendor questionnaires and expect a current SOC 2 report — usually a Type II — before they sign.
Because the underlying controls overlap so much, a large share of growing SaaS companies pursue both: run one security program, then satisfy the ISO audit and the SOC 2 examination from the same set of policies and evidence. Whichever path you take, editable policy toolkits give the documentation work a structure, so you tailor documents instead of drafting each one from a blank page — but the certificate or the report still comes only from the independent certification body or the CPA firm.
Recommended toolkits
ISO 27001 + SOC 2 Dual Toolkit
47 editable Word documents and four Excel workbooks for ISO 27001 and SOC 2, including a control crosswalk, risk register, Statement of Applicability and TSC mapping.
ISO 27001 Complete Toolkit
All 24 policies and procedures plus the risk register, 93-control Statement of Applicability and audit evidence checklist.
SOC 2 Complete Toolkit
22 policies plus the risk register, a control mapping for the 38 Security, Availability and Confidentiality criteria, and the audit evidence checklist — built for startups facing their first SOC 2.
Frequently asked questions
- Is SOC 2 a certification?
- No. SOC 2 is an attestation report issued by a licensed CPA firm, not a certification, and there is no certifying body. Saying you are "SOC 2 certified" is technically incorrect — the accurate phrasing is that you have completed a SOC 2 examination or have a SOC 2 (Type I or Type II) report. ISO/IEC 27001 is the framework here that actually leads to a certificate, issued by an accredited certification body.
- Do I need both ISO 27001 and SOC 2?
- Often, if you sell internationally and into the US. ISO 27001 is the recognized credential for EU, UK, and global enterprise buyers, while SOC 2 is what US enterprise procurement typically requests. The two share most underlying controls, so many companies build one program and satisfy both — which is why a combined toolkit and control crosswalk can be more efficient than maintaining two separate efforts.
- Which is harder or more expensive, ISO 27001 or SOC 2?
- It depends on scope, not the framework alone. ISO 27001 requires a documented management system, a Statement of Applicability covering all 93 Annex A controls, internal audits, and a two-stage certification audit. SOC 2 requires controls mapped to the Trust Services Criteria and, for a Type II, an observation window of roughly 3-12 months before the CPA examination. Audit and exam fees overlap broadly (often five figures for a small company), and most of the cost and effort in either case is the readiness and documentation work that precedes the audit.
- Will buying a policy toolkit make me ISO 27001 certified or give me a SOC 2 report?
- No. Editable toolkits give you the policies, procedures, risk register, Statement of Applicability, and Trust Services Criteria mapping that auditors expect to see, so you tailor a structured set rather than draft each document from scratch. They support your preparation, but certification still requires an independent certification body to audit your live ISMS, and a SOC 2 report still requires an independent CPA firm to examine your controls.
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