SOC 2 and ISO 27001: How They Compare

SOC 2 and ISO 27001 are the two most widely demanded security attestations for SaaS and tech companies serving enterprise customers. They are different in origin, scope, and audit model, but with substantial overlap in underlying control expectations. Companies frequently need both. This page covers what each is, where they overlap, and how to sequence them efficiently.

What each is

SOC 2 is an attestation report produced by an independent CPA firm under standards developed by the American Institute of Certified Public Accountants (AICPA). The report attests to the operating effectiveness of an organization's controls against the AICPA Trust Services Criteria. SOC 2 is most widely demanded by US enterprise buyers and is the dominant security framework in US enterprise procurement.

ISO/IEC 27001 is an international information security management system standard. Current version ISO/IEC 27001:2022. ISO 27001 certification is issued by an accredited certification body after audit demonstrating an organization has implemented an Information Security Management System meeting the standard. ISO 27001 is most widely demanded by European, Asian, and increasingly global enterprise buyers.

Neither is law. Both are market requirements driven by enterprise customer expectations.

Where they overlap

The overlap is substantial in the underlying control expectations:

  • Information security policy. Both expect documented security policies.

  • Risk management. Both require risk assessment and treatment processes.

  • Access controls. Both require role-based access, authentication, and access reviews.

  • Encryption. Both expect appropriate encryption.

  • Logging and monitoring. Both require security event logging.

  • Incident response. Both require incident response capability.

  • Change management. Both expect change management processes.

  • Vendor management. Both require vendor risk assessment.

  • Physical security. Both address physical security where applicable.

  • Personnel security. Both require background checks, training, and confidentiality obligations.

  • Business continuity. Both address business continuity and disaster recovery.

If you build a strong control environment meeting SOC 2 Trust Services Criteria for Security (and ideally Availability and Confidentiality), you address most of the ISO 27001 Annex A 2022 controls. The remaining work is mapping documentation and addressing ISO-specific elements.

Where they differ

Origin and governance. SOC 2 is US-AICPA. ISO 27001 is international ISO/IEC standard.

Audit model. SOC 2 is an attestation by a CPA firm. ISO 27001 is a certification by an accredited certification body. The two audit models have different procedures and certifications.

Type 1 vs Type 2. SOC 2 has two report types: Type 1 (point-in-time design effectiveness) and Type 2 (operating effectiveness over a period, typically 12 months). ISO 27001 certification operates differently with initial certification audit followed by annual surveillance audits and three-year recertification.

ISMS requirement. ISO 27001 specifically requires a documented Information Security Management System (ISMS) with continual improvement cycle. SOC 2 does not specifically require ISMS but expects similar governance.

Scope flexibility. SOC 2 scope is defined by the service organization (typically all systems supporting customer-facing services). ISO 27001 scope is defined by the organization but typically expected to cover the relevant business operations.

Trust Services Criteria categories. SOC 2 covers Security (required), and optionally Availability, Processing Integrity, Confidentiality, and Privacy. ISO 27001 covers all 93 Annex A 2022 controls across organizational, people, physical, and technological themes.

Geographic recognition. SOC 2 is most recognized in the US. ISO 27001 is more globally recognized including in Europe and Asia.

When to pursue each

Most growing tech companies pursue based on customer demand:

  • Pursue SOC 2 first if US enterprise customers are your primary growth driver. Typical timeline: 3 to 6 months for Type 1, 12 to 15 months for Type 2 (includes 12-month operating period).

  • Pursue ISO 27001 first if European or Asian enterprise customers are your primary growth driver. Typical timeline: 9 to 15 months including initial certification audit.

Pursue both if you serve global enterprise customers. The pursuit can be sequential or parallel.

How to pursue both efficiently

Build a single control framework that meets both. ISO 27001 Annex A 2022 plus SOC 2 Trust Services Criteria mapping. Most controls satisfy both frameworks.

Use a compliance automation platform. Vanta, Drata, Secureframe, Sprinto, and similar platforms support both frameworks with shared evidence collection. Single source of truth for controls, evidence, and documentation.

Coordinate auditor selection. Some firms can provide both SOC 2 attestation and ISO 27001 certification, simplifying coordination. Others specialize in one or the other.

Sequence carefully. SOC 2 Type 1 + ISO 27001 initial certification can be conducted in parallel. SOC 2 Type 2 requires 12-month operating period that can run concurrently with ISO 27001 surveillance audits.

Documentation overlap. Most policies and procedures can serve both frameworks. Single ISMS documentation supporting both.

Combined cost. Pursuing both typically costs 100,000 to 300,000 USD over 12 to 18 months including platform, consulting, audit fees, and certification body fees. Pursuing them sequentially with separate teams typically costs 30 to 50 percent more.

How Engage Compliance helps

Engage Compliance is specifically focused on privacy compliance (GDPR and global). For SOC 2 and ISO 27001, we coordinate with security compliance specialists and automation platforms rather than directly delivering security audit work.

For clients pursuing SOC 2 and/or ISO 27001 alongside GDPR compliance, we design the GDPR program to align with security compliance work. Specifically:

GDPR Article 32 security measures designed to map to SOC 2 Trust Services Criteria and ISO 27001 Annex A controls.

DPA templates aligned with security framework attestations.

Vendor management coordination across SOC 2 vendor requirements, ISO 27001 supplier controls, and GDPR processor obligations.

Privacy management platform selection that integrates with security automation platforms.

For SOC 2 and ISO 27001 implementation work, we recommend specialists like Workstreet (combined security plus privacy), as well as automation platforms like Vanta, Drata, and Secureframe.

Get started

If you are pursuing SOC 2 or ISO 27001 alongside GDPR compliance, book a consultation about how to align the work.