SOC 2 vs ISO 27001: Which Do You Need?
Both demonstrate security maturity, but they serve different purposes and markets. Here's how to decide which to pursue, or whether you need both.
Quick Comparison Table
| Factor | SOC 2 | ISO 27001 |
|---|---|---|
| Origin | US (AICPA) | International (ISO) |
| Output | Audit report | Certification |
| Validity | Annual | 3 years (with surveillance) |
| Focus | Trust Service Criteria | ISMS framework |
| Auditor | Licensed CPA firm | Accredited certification body |
| Best for | US SaaS companies | International/enterprise |
| First-year cost | $40K-$125K | $30K-$80K |
| Timeline | 6-12 months | 9-18 months |
Origin
Output
Validity
Focus
Auditor
Best for
First-year cost
Timeline
Choose SOC 2 If
SOC 2 is the right choice when your business model and customer base are primarily US-focused.
- Your customers are primarily US-based
- You're selling to other SaaS/tech companies
- Speed matters (typically faster than ISO 27001)
- Customers specifically request SOC 2 Type II
- You want annual validation of controls operating effectively
Choose ISO 27001 If
ISO 27001 is the right choice when you need global recognition and broader market appeal.
- You're selling internationally (EU, APAC)
- Enterprise customers require it
- Government contracts outside the US
- You want one globally-recognized certification
- You prefer a 3-year certification cycle
When You Need Both
Some companies need both certifications to satisfy different market segments and customer requirements.
Sequencing Recommendation
For most companies pursuing both certifications, the optimal path is: 1. Start with SOC 2 (faster, builds foundation) 2. Add ISO 27001 (leverage SOC 2 work, approximately 40% overlap) Alternatively, if your international market is primary, start with ISO 27001 and use that foundation to accelerate SOC 2.
Overlap Between Frameworks
What Carries Over (~40%)
- Security policies and procedures
- Technical controls documentation
- Evidence collection processes
- Risk assessment methodology (with adjustments)
- Security awareness training
Unique to SOC 2
- Trust Service Criteria categories
- CPA attestation
Unique to ISO 27001
- ISMS structure
- Management review
- Internal audit program
The bottom line: If you pursue both certifications, you'll avoid duplicate work on foundational security controls. The additional effort focuses on adapting documentation and adding framework-specific elements rather than building entirely new controls.
Frequently Asked Questions
Is one harder than the other?
Different rather than harder. SOC 2 is more prescriptive about which controls you need, making it straightforward once you know the requirements. ISO 27001 requires more formal documentation and ISMS structure but gives flexibility in how you define your scope and which controls apply. Choose SOC 2 if you prefer clear requirements; choose ISO 27001 if you prefer flexibility in scope definition.
Can the same auditor do both?
Sometimes, but not typically. SOC 2 requires a licensed CPA firm. ISO 27001 requires an accredited certification body. A few firms hold both credentials and can audit both frameworks, but most specialize in one. It's worth asking about dual-audit firms to streamline the process if you're pursuing both.
Does SOC 2 satisfy ISO 27001 requirements?
No, they're not interchangeable. SOC 2 demonstrates control effectiveness to US customers. ISO 27001 demonstrates you have a formal Information Security Management System. Enterprise customers and governments worldwide specifically require ISO 27001 certification. However, SOC 2 work does provide a strong foundation for ISO 27001 - approximately 40% of your effort carries over directly.
How much work is it to add the second certification?
If pursuing ISO 27001 after SOC 2: typically 3-6 months of additional work (20-30% of initial effort). You'll leverage existing policies, controls, and evidence. The main additional work is formalizing your ISMS documentation, management review processes, and internal audit program. If pursuing SOC 2 after ISO 27001: typically 2-4 months (you already have the controls; it's mainly about organizing them against Trust Service Criteria).
Which is more expensive to maintain?
ISO 27001 is typically cheaper to maintain after initial certification. You have one full recertification every 3 years with annual surveillance audits ($10K-$20K). SOC 2 requires a full Type II audit every year ($10K-$20K). Over 3 years, SOC 2 costs $30K-$60K in audits, while ISO 27001 is roughly $40K-$80K for the initial certification plus ~$30K-$60K in surveillance audits. Plus, you'll need to maintain compliance platforms and tools either way, typically $10K-$25K annually.
Not Sure Which Path is Right for You?
Let's discuss your business goals, customer requirements, and timeline to create a compliance roadmap tailored to your situation.