ISO 27001 vs SOC 2: Which Do You Need?
Quick Answer
ISO 27001 is an international certification standard with 93 prescriptive controls, recognized globally. SOC 2 is a US attestation framework based on Trust Services Criteria, recognized primarily in North America. Many organizations need both — there's 60-70% control overlap.
Key Differences at a Glance
Key Takeaways
- ISO 27001 = certification (pass/fail) by accredited certification bodies; SOC 2 = attestation report by CPA firms
- ISO 27001 is globally recognized; SOC 2 is primarily valued in North America
- ISO 27001 has 93 prescriptive controls; SOC 2 has flexible Trust Services Criteria
- 60-70% control overlap — doing both together saves significant effort
- Choose based on your market: US customers often want SOC 2; European/APAC customers want ISO 27001
| Feature | ISO 27001 | SOC 2 |
|---|---|---|
| Standard body | International standard (ISO/IEC) | US framework (AICPA) |
| Validation | Certification by accredited CB | Attestation report by CPA firm |
| Controls | 93 Annex A controls (2022) | 5 Trust Services Criteria |
| Approach | Risk-based control selection | Criteria-based: you choose how |
| Cycle | 3-year certificate + annual surveillance | Type 1 (point-in-time) or Type 2 (period) |
| Recognition | Globally recognized (esp. Europe, APAC) | Primarily valued in North America |
| Flexibility | Prescriptive: specific controls required | Flexible: meet criteria your way |
| Scope | Covers entire ISMS lifecycle | Focused on service organization controls |
Detailed Comparison
| Aspect | ISO 27001 | SOC 2 |
|---|---|---|
| Output | Certificate (valid 3 years) | Attestation report (Type 1 or Type 2) |
| Assessor | Accredited certification body | Licensed CPA firm |
| Scope | Your ISMS — can be the entire org or subset | Your service and its controls |
| Controls | 93 controls in Annex A (select based on risk) | 5 Trust Services Criteria (Security mandatory, others optional) |
| Assessment Period | Point-in-time certification + annual surveillance | Type 1: point-in-time; Type 2: 3-12 month observation |
| Cost | $30K-$100K+ (first year) | $20K-$80K+ (first year) |
| Timeline | 6-12 months to certify | 3-9 months to report ready |
| Renewal | Surveillance audits annually, recertification every 3 years | Annual Type 2 report (no formal renewal) |
| Market Demand | Enterprise, Europe, APAC, government | SaaS, US tech, financial services |
| Regulatory Alignment | Maps to GDPR, NIS2, DORA | Maps to US financial regulations |
When to Choose Each
Framework Selection Guide
Choose based on your market and customer requirements
US SaaS Customers
Start with SOC 2 Type 2
European Enterprise
Start with ISO 27001
Global Market
Do both — start with one, add the other
Government Contracts
ISO 27001 (or both depending on jurisdiction)
Pursuing Both Frameworks
Efficient Dual Compliance Strategy
Choose your starting framework
Pick based on immediate customer demand. If US-focused, start SOC 2. If Europe/APAC-focused, start ISO 27001. Both create a solid foundation for the other.
Use a multi-framework compliance platform
Platforms like Vanta, Drata, or Secureframe map controls across both frameworks. Implement once, report twice. This is the most efficient path to dual compliance.
Map the overlap
60-70% of controls overlap. Your access controls, encryption, incident response, change management, etc. satisfy both frameworks. Document the mapping so you don't duplicate work.
Address framework-specific gaps
ISO 27001 requires: formal risk assessment methodology, SoA, management review, internal audit program. SOC 2 requires: continuous monitoring evidence, system description, management assertions. Fill the gaps specific to each.
Coordinate audit timing
Some firms can perform combined assessments. Even if separate, timing them close together means evidence is fresh and preparation effort is consolidated.
ℹ️ The 60-70% Overlap
Access controls, encryption, incident response, change management, vendor management, HR security, business continuity, and logging/monitoring are all shared between ISO 27001 and SOC 2. The main differences are in governance structure (ISO 27001's ISMS clauses vs SOC 2's system description) and assessment approach.
60-70%
Control Overlap
Between ISO 27001 and SOC 2
30-40%
Cost Savings
When pursuing both together vs separately
3-6 months
Additional Time
To add second framework after first
Both
What Enterprises Want
Many require ISO 27001 AND SOC 2
Can I replace ISO 27001 with SOC 2 (or vice versa)?
Not directly. While they have significant overlap, they serve different purposes and markets. A European enterprise asking for ISO 27001 won't accept a SOC 2 report as equivalent (and vice versa). If your customers require a specific framework, you need that framework.
Which is harder to achieve?
ISO 27001 is generally considered more rigorous due to the formal ISMS requirements (risk assessment methodology, management review, internal audit program, continual improvement). SOC 2 can be achieved faster with less formal governance. However, the actual difficulty depends on your starting point.
If I have SOC 2, how much additional effort for ISO 27001?
With SOC 2 already in place, you've likely satisfied 60-70% of ISO 27001 controls. The additional effort focuses on: formal risk assessment, Statement of Applicability, internal audit program, management review process, and ISMS documentation. Expect 3-6 months of additional work.
Do customers accept one instead of the other?
It depends on the customer and region. US tech companies typically accept SOC 2. European enterprises typically require ISO 27001. Many large enterprises require both. Always ask your customers what they need rather than guessing.
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