ISO 27001 vs SOC 2: Which One Do You Need?
SOC 2 is a US-favored attestation; ISO 27001 is a globally recognized certification. How they differ, where they overlap, and which to pursue first.
Both ISO 27001 and SOC 2 prove you take security seriously — but they are different instruments. ISO 27001 is an international certification of your security management system. SOC 2 is an attestation report a CPA firm writes about your controls. The right choice usually comes down to where your customers are.
ISO 27001 vs SOC 2: side by side
| Dimension | ISO 27001 | SOC 2 |
|---|---|---|
| Type | Certification (pass/fail) | Attestation report (auditor opinion) |
| Issued by | Accredited certification body | CPA / audit firm |
| Geography | Recognized globally | Most common with US buyers |
| Focus | Building an ISMS (management system) | Controls against Trust Services Criteria |
| Output | A certificate | A detailed report customers read |
| Validity | 3 years (with surveillance audits) | Point-in-time (Type I) or period (Type II) |
Which should you get first?
- Selling mainly to US companies? SOC 2 (Type II) is usually requested first.
- Selling internationally / in Europe? ISO 27001 often carries more weight.
- Both markets? Start with whichever your near-term pipeline demands; the evidence overlaps heavily, so the second is cheaper.
What they share
Both expect access control, change management, vulnerability management, monitoring, vendor risk, and incident response — and both expect security testing. A single annual penetration test and a well-organized evidence set support either framework.
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Frequently asked questions
- What is the difference between ISO 27001 and SOC 2?
- ISO 27001 is an international standard you get certified against; it focuses on building and operating an Information Security Management System (ISMS). SOC 2 is an attestation report produced by a CPA firm against the Trust Services Criteria, describing how your controls are designed and operating. ISO 27001 is more common globally; SOC 2 is more common with US buyers.
- Should I get SOC 2 or ISO 27001 first?
- Choose based on your customers. If you sell primarily to US companies, SOC 2 is usually requested first. If your buyers are international or in Europe, ISO 27001 often carries more weight. Many companies eventually pursue both, reusing overlapping evidence.
- Do ISO 27001 and SOC 2 require a penetration test?
- Both expect vulnerability management and testing. SOC 2 auditors typically expect an annual penetration test as evidence; ISO 27001 requires technical vulnerability management and testing as part of the ISMS. A single pen test can support both.
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