SOC 2 vs ISO 27001: Cost, Scope, and When You Need Both
SOC 2 dominates in North America. ISO 27001 is the global standard. Increasingly, enterprise customers expect both. The good news: 60-70% of controls overlap, so doing both together saves 30-40% compared to doing them separately.
| SOC 2 | ISO 27001 | |
|---|---|---|
| Governing body | AICPA (US) | ISO/IEC (International) |
| Type | Attestation (CPA audit report) | Certification (accredited auditor) |
| Year 1 cost | $20K-$100K | $25K-$80K |
| Annual renewal | $15K-$50K | $10K-$30K (surveillance) |
| Certification cycle | Annual attestation | 3-year cert + annual surveillance |
| Geographic relevance | Primarily US/Canada | Global (especially EU, APAC) |
| Timeline | 4-15 months | 6-18 months |
| Control framework | Trust Services Criteria (flexible) | Annex A controls (93 controls) |
| Customer expectation | US enterprise buyers | EU/global enterprise + regulated industries |
Control Overlap: 60-70%
SOC 2 Trust Services Criteria and ISO 27001 Annex A controls overlap significantly. If you have already achieved SOC 2, approximately 60-70% of the ISO 27001 controls are already addressed. The remaining 30-40% focuses on areas where ISO 27001 goes deeper: formal ISMS documentation, management commitment, internal audit programme, and continuous improvement processes.
Shared control areas
- - Access control and identity management
- - Encryption and data protection
- - Incident response
- - Vendor management
- - Change management
- - Risk assessment
- - Employee security training
- - Physical security
ISO 27001 unique requirements
- - Formal Information Security Management System (ISMS)
- - Internal audit programme (at least annual)
- - Management review meetings (documented)
- - Corrective action and continual improvement
- - Statement of Applicability (SoA)
- - More prescriptive asset management
Cost of Doing Both Together
| Approach | Year 1 Cost | Savings |
|---|---|---|
| SOC 2 alone, then ISO 27001 separately | $45K-$180K | Baseline |
| Both together (same auditor, shared evidence) | $35K-$130K | 30-40% savings |
Which Do You Need?
SOC 2 Only
- - US-only customer base
- - B2B SaaS selling to US enterprises
- - No European expansion plans
- - Budget-constrained (start here)
ISO 27001 Only
- - EU/APAC-primary customer base
- - Regulated industries in Europe
- - Government or defence contracts
- - Global company with minimal US presence
Both (Increasingly Common)
- - US + EU/global customer base
- - Series B+ with enterprise ambitions
- - IPO or M&A timeline
- - Prospects asking for both
SOC 2 vs SOC 1
SOC 1 is for service organisations that affect their customers' financial reporting (payroll processors, payment services, hosting providers). SOC 2 is for information security. If your customers' auditors ask about financial controls, you need SOC 1. If they ask about data security, you need SOC 2. Some companies need both.
SOC 1 audit costs are similar to SOC 2 ($10K-$60K) but involve different expertise (financial auditors vs IT auditors).
SOC 2 vs HIPAA
HIPAA is a legal requirement for handling Protected Health Information (PHI). SOC 2 is a voluntary trust framework. They are complementary, not alternatives. Healthcare SaaS companies typically need HIPAA compliance and often add SOC 2 to demonstrate broader security maturity to enterprise health systems.
HIPAA compliance costs $20K-$80K initially. Adding SOC 2 with HIPAA adds $15K-$40K thanks to significant control overlap, especially if you add the Privacy criterion.