SOC 2 vs ISO 27001 — Complete Comparison
Both frameworks address information security, but they differ in scope, audit process, cost, and recognition. Use this side-by-side comparison to decide which one your organisation needs — or whether you need both.
Quick Comparison
What Is SOC 2?
SOC 2 (Service Organization Control 2) is an audit framework developed by the American Institute of Certified Public Accountants (AICPA). It evaluates how service organisations manage customer data against five Trust Service Criteria: Security, Availability, Processing Integrity, Confidentiality, and Privacy. Only Security is mandatory; the others are included based on the organisation's commitments to customers.
SOC 2 produces an audit report (not a certificate) issued by a licensed CPA firm. There are two report types: Type 1 evaluates control design at a single point in time, and Type 2 evaluates both design and operating effectiveness over a period of 6–12 months. Most enterprise buyers want Type 2 reports because they demonstrate controls actually work in practice, not just on paper.
SOC 2 is most common in the US SaaS and cloud services market. It is widely required during enterprise vendor due diligence — particularly when selling to financial services, healthcare, or government customers. For a deeper overview, see our complete SOC 2 compliance guide.
What Is ISO 27001?
ISO/IEC 27001 is the international standard for Information Security Management Systems (ISMS), published by ISO and IEC. The current version (ISO/IEC 27001:2022) defines requirements for establishing, implementing, maintaining, and continually improving an ISMS — a structured approach to managing information security risks across an organisation.
Unlike SOC 2, ISO 27001 is a certifiable standard. Organisations can be audited by an accredited certification body and receive formal certification valid for three years. The standard contains 10 management clauses plus 93 controls organised across four themes in Annex A: Organisational, People, Physical, and Technological controls.
ISO 27001 is recognised globally and is the most widely adopted information security standard worldwide. It is particularly common in Europe, Asia, and Australia, and is increasingly required by enterprise customers, regulators, and government agencies. For a deeper overview, see our complete ISO 27001 certification guide.
Scope Differences
SOC 2 focuses on five Trust Service Criteria categories that describe outcomes service organisations commit to delivering. The criteria are flexible — organisations choose which TSCs apply based on their service commitments. This makes SOC 2 conceptually simpler but means scope can vary significantly between organisations.
ISO 27001 is comprehensive. It requires a full Information Security Management System covering risk assessment, leadership commitment, planning, support, operation, performance evaluation, and continual improvement. Organisations select which Annex A controls apply through a Statement of Applicability (SoA), justifying inclusions and exclusions against their risk assessment.
In practice: SOC 2 lets you scope tightly to specific systems and services. ISO 27001 typically requires broader organisational coverage but provides more flexibility in how controls are implemented.
Audit Process Differences
SOC 2 audits are conducted exclusively by licensed CPA firms (typically large accounting firms or specialised SOC 2 auditors). The audit produces a written report describing controls and findings. Type 1 audits are point-in-time; Type 2 audits cover an observation period of 6–12 months during which the auditor tests controls in operation.
ISO 27001 audits are conducted by certification bodies accredited under ISO/IEC 17021. The audit follows a two-stage process: Stage 1 reviews documentation and readiness, Stage 2 assesses ISMS effectiveness in operation. Certification is granted for three years, with annual surveillance audits and a recertification audit at the end of the cycle.
The practical difference: SOC 2 reports must be redone every year (typically a 12-month observation period). ISO 27001 certification is valid for three years with cheaper annual surveillance audits, making it more economical over time.
Cost Comparison
Costs vary significantly based on organisation size, scope, and complexity. Typical ranges for small-to-medium organisations:
- SOC 2 Type 1: $10,000–$30,000 USD (one-time audit)
- SOC 2 Type 2: $30,000–$100,000+ USD (annual)
- SOC 2 readiness assessment: $10,000–$25,000 USD (often required before first audit)
- ISO 27001 implementation: $15,000–$50,000 AUD (one-time, plus internal effort)
- ISO 27001 certification audit: $10,000–$30,000 AUD (one-time)
- ISO 27001 surveillance audits: $5,000–$15,000 AUD per year
Over a 3-year period, ISO 27001 is typically cheaper than SOC 2 Type 2 because the certification is valid for 3 years with cheaper surveillance audits, while SOC 2 Type 2 must be reaudited annually.
Which One Do You Need?
Use this decision guide based on your business context:
- Selling primarily to US enterprise SaaS customers? → SOC 2 Type 2 is usually the faster path to closing deals.
- Selling internationally or in regulated industries? → ISO 27001 has broader recognition and longer-lasting certification value.
- Australian or European customer base? → ISO 27001 is the dominant standard in these markets.
- Subject to GDPR or APP obligations? → ISO 27001 (extended with ISO 27701) provides stronger evidence of accountability.
- Need to demonstrate operational maturity to investors or acquirers? → ISO 27001 is the more comprehensive management system.
- Need to unblock a single big US enterprise deal quickly? → SOC 2 Type 1 first, then Type 2.
If your customers explicitly tell you which framework they require, that decision is made for you. If they leave it open, choose based on geography and sales motion.
Can You Do Both?
Yes — and many organisations do. The two frameworks have significant control overlap (60–70% of SOC 2 controls map to ISO 27001 controls), so building both on a unified foundation is more efficient than running parallel programs.
The most common pattern: implement ISO 27001 first to establish a comprehensive ISMS, then layer SOC 2 on top for US enterprise sales. The ISMS provides the underlying control environment; SOC 2 adds the AICPA-specific reporting and TSC commitments. Some organisations reverse this — starting with SOC 2 Type 1 to close immediate deals, then expanding to ISO 27001 for global recognition.
Doing both requires more effort than either alone, but the marginal cost of adding the second framework is much lower than implementing it from scratch.
If you're implementing both frameworks, browse the unified controls library on ControlStack to see how SOC 2 TSCs map to ISO 27001 Annex A controls.
Training Pathways
Building internal expertise in either framework reduces consulting costs and helps your team manage compliance ongoing. Mindset Cyber offers PECB-accredited training for both:
If you are pursuing both frameworks, the ISO 27001 Lead Implementer course provides the broader foundation, and the SOC 2 Lead Analyst course adds the AICPA-specific knowledge.
Resources
- SOC 2 Compliance Guide — Complete overview of Trust Service Criteria, Type 1 vs Type 2, and audit process.
- ISO 27001 Certification Guide — Complete overview of the international information security standard.
- ISO 27001 Certification Cost — Detailed cost breakdown by organisation size.
- ISO 27701 Privacy Management — The privacy extension to ISO 27001.
- All Courses — Browse the full catalogue of PECB training.
Frequently Asked Questions
Common questions about choosing between SOC 2 and ISO 27001.
Should I get SOC 2 or ISO 27001 first?
It depends on your customers. If your buyers are primarily US-based enterprise SaaS customers, SOC 2 is usually the faster path to closing deals. If you sell internationally — especially in Europe, Asia, or Australia — ISO 27001 has broader recognition and longer-lasting value. Many organisations end up doing both, but starting with the framework that unblocks the most revenue is the pragmatic choice.
Can I use ISO 27001 controls to satisfy SOC 2?
Yes — there is significant overlap. Organisations with a mature ISO 27001 ISMS typically find that 60–70% of SOC 2 Trust Service Criteria are already addressed. You will still need a separate SOC 2 audit by a CPA firm to receive a SOC 2 report, but the implementation effort is dramatically reduced if you already have ISO 27001 controls in place.
Is SOC 2 cheaper than ISO 27001?
For a Type 1 report on a small SaaS company, SOC 2 can be cheaper than ISO 27001 ($10K–$30K USD vs $15K–$50K AUD). However, SOC 2 Type 2 (which is what most enterprise buyers actually want) costs $30K–$100K+ USD and must be renewed annually, while ISO 27001 certification is valid for 3 years with cheaper surveillance audits. Over a 3-year period, ISO 27001 is often cheaper than SOC 2 Type 2.
Do US companies care about ISO 27001?
Increasingly, yes. US enterprise buyers historically asked for SOC 2 because it was the AICPA standard they understood. As more US companies operate globally, ISO 27001 is gaining recognition — particularly in regulated industries (financial services, healthcare, government) and in vendor risk programs that consider both standards. SOC 2 still wins for pure US SaaS, but ISO 27001 is a strong second.
Which certification looks better on a resume?
For US-focused careers in SaaS compliance and audit, the PECB SOC 2 Lead Analyst credential is the most relevant. For global cybersecurity careers, the ISO 27001 Lead Implementer or Lead Auditor credentials are more recognised internationally. Many compliance professionals hold both, especially those working in vendor risk management or multi-framework GRC roles.
Build expertise in both frameworks
Mindset Cyber delivers PECB-accredited training for SOC 2, ISO 27001, and ISO 27701 — all as self-paced eLearning with exam vouchers included.