A detailed comparison to help you understand the differences, similarities, and when you need each framework.
SOC 2 is an attestation standard developed by the AICPA, primarily adopted by SaaS and technology companies operating in North America. It evaluates controls based on five Trust Services Criteria: Security, Availability, Processing Integrity, Confidentiality, and Privacy. The audit is performed by a licensed CPA firm and results in an attestation report that is shared under NDA with customers and prospects.
ISO 27001 is an international certification standard for Information Security Management Systems (ISMS), recognized worldwide across all industries. It provides a comprehensive framework of 93 controls across organizational, people, physical, and technological domains. Certification is issued by accredited bodies after a two-stage audit process and requires annual surveillance audits with full recertification every three years.
| Aspect | SOC 2 Type II | ISO 27001 |
|---|---|---|
| Scope | Evaluates controls against 5 optional Trust Services Criteria (Security is required) | Requires an ISMS addressing all applicable controls from 93 Annex A controls across 4 themes |
| Geography | Primarily recognized in North America; standard for US enterprise procurement | Internationally recognized across Europe, Asia-Pacific, and government sectors worldwide |
| Certification type | Attestation report issued by a licensed CPA firm (not a certification) | Formal certification issued by an accredited certification body |
| Audit process | Single audit engagement with 6-12 month observation period for Type II | Two-stage audit (documentation review then operational assessment) with annual surveillance |
| Cost | $30,000-$100,000 annually for the audit engagement alone | $20,000-$80,000 for initial certification; $10,000-$30,000 for annual surveillance |
| Timeline | 3-6 months readiness plus 6-12 months observation period | 6-18 months from project start to certification, depending on maturity |
| Required policies | Policies mapped to selected TSC criteria; typically 15-20 core policies | Mandatory ISMS documentation plus policies for all applicable Annex A controls |
| Renewal cycle | Annual audit engagement required; no multi-year validity | Three-year certification with annual surveillance audits |
If you sell primarily to US-based enterprise customers, SOC 2 is typically the first ask in procurement. If you operate internationally or sell to European, Asian, or government clients, ISO 27001 is often required or strongly preferred. Many organizations pursuing both start with SOC 2 (faster to achieve) and then expand to ISO 27001, leveraging the approximately 70% overlap in controls. SaaS companies, cloud providers, and managed service providers most commonly need both to maximize their addressable market.
If you need only one, choose based on your customer base geography. If budget allows, pursue both — the control overlap is substantial, and having both certifications significantly expands your addressable market. Start with SOC 2 if you need to close US enterprise deals quickly, then layer ISO 27001 for international credibility.
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