ISO 27001 vs SOC 2
Comprehensive comparison to choose the right framework for your Vietnamese business
Japan, EU, Singapore markets, enterprise requiring comprehensive ISMS.
View ISO 27001 hub →US, Canada markets, SaaS and tech companies with enterprise B2B customers.
View SOC 2 hub →Detailed comparison
| Aspect | ISO 27001 | SOC 2 |
|---|---|---|
| Origin / Body | ISO/IEC (quốc tế) | AICPA (Mỹ) |
| Type | Certification (Certificate) | Audit report (Report) |
| Target market | Japan, EU, Singapore, global | US, Canada, enterprise SaaS |
| Scope | Organizational ISMS (flexible definition) | Specific service or system |
| Issuer / Auditor | Certification Body (CB) accredited by IAF | CPA firm licensed by AICPA |
| Output type | ISO 27001 certificate (3 years + surveillance) | SOC 2 Type I or Type II report |
| Observation period | None, audit at a point in time | Type II: minimum 6 months |
| Controls | 93 controls (Annex A, ISO 27001:2022) | Based on 5 Trust Service Criteria (TSC) |
| Audit cost (estimate) | Varies by CB, company size | Usually higher than ISO 27001 in Vietnam |
| Time to certification | Typically 6-18 months depending on size | Type I: 3-6 months; Type II: 9-18 months |
| Best for | B2B enterprise, outsourcing, HealthTech, Fintech targeting Asia | B2B SaaS targeting US/Canada market |
Which to choose? Decision guide
Choose ISO 27001 if...
- Target customers in Japan, Singapore, EU
- Doing outsourcing or building enterprise products
- Want the most globally recognized certification
- At Series A stage or beyond
- Want to use as foundation for other frameworks
Choose SOC 2 if...
- Target customers in US, Canada
- B2B SaaS with enterprise customers
- Customers explicitly request SOC 2 report
- Want scope flexibility (just one service)
Do both if...
- Targeting both US and Japan/EU markets
- At Series B+ with sufficient resources
- Want to leverage control overlap (~60-70%)
- Customers mention both in security questionnaires
Control overlap: How does ISO 27001 first help?
ISO 27001 Annex A and SOC 2 Trust Service Criteria have approximately 60–70% overlap (based on mapping ISO 27001:2022's 93 Annex A controls against AICPA TSC CC series). If already ISO 27001 certified, you've built most of the foundation needed for SOC 2. Remaining gaps are typically: specific SOC 2 evidence collection processes and the observation period.
Frequently asked questions
Which is harder: ISO 27001 or SOC 2?
ISO 27001 is generally more complex in terms of documentation and process, you need to build a comprehensive ISMS with risk assessment, SoA, and nonconformity management. SOC 2 is more flexible on controls but requires continuous evidence collection throughout the observation period (minimum 6 months for Type II).
Can you do ISO 27001 and SOC 2 simultaneously?
Yes. Many companies choose to do both simultaneously to save time. Approximately 60-70% of controls overlap, so the additional effort to achieve both is not double. However, it requires good planning and typically a compliance platform to manage evidence for both frameworks.
Does ISO 27001 help with SOC 2?
Significantly. ISO 27001 builds the control and policy foundation that SOC 2 also requires. Access control, incident management, vulnerability management, encryption, all overlap. What SOC 2 adds is: SOC 2-specific criteria mapping, evidence collection processes, and audit readiness documentation.
Which should startups start with?
Depends on target market. If targeting US → SOC 2 Type I first (faster, 3-6 months). If targeting Japan/Singapore/EU → ISO 27001. If no clear target market yet, ISO 27001 is often the safer choice as it's globally recognized.
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