SOC 2 vs ISO 27001: Which Do You Need?
Quick Answer
SOC 2 is a US-focused attestation ideal for B2B SaaS companies selling to US customers, while ISO 27001 is an international certification recognized globally. Many companies pursuing enterprise sales need both.
SOC 2 vs ISO 27001: Overview
SOC 2 and ISO 27001 are the two most common security frameworks for B2B companies. While they overlap significantly (about 80% of controls are similar), they differ in structure, geography, and how they're assessed. Understanding when to pursue each — or both — can save you significant time and money.
Key Takeaways
- SOC 2 = US-focused attestation; ISO 27001 = globally recognized certification
- ~80% overlap in actual controls — pursuing both is 30-40% more work, not double
- US enterprise buyers typically want SOC 2; European/APAC buyers want ISO 27001
- SOC 2 costs $30K-$100K/year; ISO 27001 costs $40K-$120K in year 1
- If selling globally, you'll likely need both — start with whichever your current customers demand
Side-by-Side Comparison
SOC 2 vs ISO 27001
| Feature | SOC 2 | ISO 27001 |
|---|---|---|
| Type | Attestation (auditor opinion) | Certification (pass/fail) |
| Issuing body | AICPA (US) | ISO/IEC (international) |
| Geographic recognition | Primarily US, growing globally | Global — especially Europe, APAC |
| Assessment | Annual audit by CPA firm | 3-year certification cycle with annual surveillance |
| Output | SOC 2 report (restricted distribution) | ISO 27001 certificate (publicly shareable) |
| Validity | Annual renewal (report < 12 months old) | 3-year certificate with annual surveillance audits |
| Approach | Criteria-based (flexible implementation) | Management system (ISMS) with mandatory documentation |
| First-year cost | $30,000-$100,000+ | $40,000-$120,000+ |
| Timeline | 1-3 months (Type I), 6-14 months (Type II) | 6-18 months |
| Best for | US B2B SaaS companies | Companies with global customers |
Key Differences Explained
1. Attestation vs Certification
SOC 2 produces an attestation report — a CPA firm gives their opinion on your controls, but there's no pass/fail certificate. You share the full report (under NDA) with customers. ISO 27001 produces a certification — an accredited certification body formally certifies your ISMS, and you receive a certificate you can display publicly.
2. Scope and Approach
SOC 2 is criteria-based — you choose which Trust Services Criteria to include and demonstrate that your controls meet those criteria. ISO 27001 is management-system-based — you must implement a complete Information Security Management System (ISMS) following the Plan-Do-Check-Act methodology, with mandatory documentation including a risk assessment, Statement of Applicability, and continual improvement processes.
3. Audit Cycle
| Aspect | SOC 2 | ISO 27001 |
|---|---|---|
| Initial audit | Type I (point-in-time) or Type II (period) | Stage 1 (documentation) + Stage 2 (implementation) |
| Ongoing audits | Annual Type II audit | Annual surveillance audits (years 2-3) |
| Recertification | New report each year | Full recertification every 3 years |
| Audit duration | 2-6 weeks fieldwork | 2-10 days on-site per audit |
| Auditor requirements | Licensed CPA firm | Accredited certification body |
When to Choose SOC 2
- Your customers are primarily US-based
- You're a B2B SaaS company selling to US enterprises
- Customers explicitly ask for a SOC 2 report
- You need to show compliance quickly (Type I in 4-8 weeks)
- Your sales cycle requires a detailed control report
When to Choose ISO 27001
- Your customers are in Europe, APAC, or other international markets
- You want a publicly shareable certificate (not just NDA-protected reports)
- Government or regulated industry RFPs require ISO 27001
- You want a longer certification cycle (3 years vs annual)
- You're building a mature, long-term security management system
Pursuing Both: The Combined Approach
Many growing companies eventually need both. The good news: because of the ~80% control overlap, pursuing both is about 30-40% more work than pursuing one, not double. Here's the efficient approach:
How to Get Both SOC 2 and ISO 27001 Efficiently
Start with whichever your current customers need
If your immediate deals require SOC 2, start there. If they require ISO 27001, start there. Don't try to do both simultaneously from scratch.
Build on the overlap
After achieving one, map your existing controls to the other framework. About 80% of your controls will carry over directly.
Use a compliance tool that supports both
Platforms like Vanta and Drata support both SOC 2 and ISO 27001, allowing you to manage shared controls from a single dashboard.
Consider a combined audit
Some auditors can perform SOC 2 and ISO 27001 assessments concurrently, reducing the total audit time and cost by 20-30%.
80%
Control Overlap
Between SOC 2 CC and ISO 27001 Annex A
30-40%
Extra Effort
To add the second framework (not double)
20-30%
Cost Savings
With combined audits vs separate
3-6 months
Additional Time
To add the second framework after the first
Which is harder to achieve — SOC 2 or ISO 27001?
ISO 27001 is generally considered more rigorous because it requires a formal ISMS with mandatory documentation, risk methodology, and management reviews. SOC 2 is more flexible in implementation. However, both require significant effort.
Is one more respected than the other?
Neither is inherently more respected — it depends on your audience. US enterprise buyers trust SOC 2 more; European buyers trust ISO 27001 more. Having both gives you maximum credibility globally.
Can one auditor do both SOC 2 and ISO 27001?
It depends. SOC 2 requires a CPA firm; ISO 27001 requires an accredited certification body. Some firms are qualified for both. Check whether your auditor holds both qualifications.
If I have ISO 27001, do I still need SOC 2?
Often yes, especially if selling to US enterprises. While ISO 27001 covers most SOC 2 requirements, US buyers specifically want a SOC 2 report because it includes detailed control descriptions and testing results they're familiar with.
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