SOC 2 vs ISO 27001: Which Framework Does Your Startup Need First?
SOC 2 vs ISO 27001 — what's the difference, which one your customers actually require, and how to pursue both without doubling your compliance workload.
The short answer
US customers ask for SOC 2. European customers ask for ISO 27001. If you're selling to both, you'll eventually need both. If you're only selling in one market, start with what your customers actually require.
The longer answer involves understanding what each standard covers, how they differ, and why pursuing them together is more efficient than sequentially.
What is SOC 2?
SOC 2 (System and Organization Controls 2) is a US auditing standard developed by the AICPA. It evaluates whether a company's systems and processes meet the Trust Service Criteria: Security, Availability, Confidentiality, Processing Integrity, and Privacy.
A SOC 2 report is issued by a licensed CPA firm after an audit. It's not a certification — it's an attestation report. Enterprise procurement teams in the US treat it as the baseline security validation for SaaS vendors.
Who requires it: US enterprise companies, Series A+ investors during due diligence, US government contractors.
What is ISO 27001?
ISO 27001 is an international standard for information security management systems (ISMS). It's published by the International Organization for Standardization and covers 93 controls across 4 themes: organizational, people, physical, and technological.
Unlike SOC 2, ISO 27001 results in a certification — you either have it or you don't. Certification is issued by an accredited certification body after a two-stage audit process.
Who requires it: European enterprise companies, UK government and NHS suppliers, enterprise buyers in Asia-Pacific and the Middle East, large financial institutions globally.
The key differences
| SOC 2 | ISO 27001 | |
|---|---|---|
| Origin | US (AICPA) | International (ISO/IEC) |
| Output | Audit report | Certification |
| Recognition | Strong in US | Strong globally, especially EU |
| Audit frequency | Annual | 3-year cycle with annual surveillance |
| Controls | Flexible (TSC-based) | 93 controls (Annex A) |
| Cost (audit) | $8,000–$40,000 | $10,000–$30,000 |
| Typical first timeline | 3–6 months | 6–12 months |
Can you do both at the same time?
Yes — and you should if you're selling internationally. SOC 2 and ISO 27001 share significant overlap in their control requirements. About 70% of the evidence you collect for SOC 2 also satisfies ISO 27001 requirements.
The key is to collect evidence in a way that maps to both frameworks simultaneously — which is exactly what compliance automation tools do. You connect your AWS, GitHub, and Okta once. The evidence maps to SOC 2 CC6 and ISO 27001 A.9 at the same time.
The additional overhead of pursuing ISO 27001 alongside SOC 2 is roughly 30% more work — not 100% more. Don't run them sequentially if you can avoid it.
Which one to do first
Do SOC 2 first if:
- Your primary market is the United States
- You're losing deals because US enterprise prospects are asking for it
- You're raising a Series A/B and investors are requesting security validation
- You want the fastest path to a credible security posture (3–6 months vs 6–12)
Do ISO 27001 first (or simultaneously) if:
- Your primary market is Europe, UK, or Asia-Pacific
- You're selling into financial services, healthcare, or government
- Your enterprise prospects specifically name ISO 27001 in their vendor questionnaires
- You want international credibility that SOC 2 alone doesn't provide
GDPR and ISO 27001
If you process personal data of EU residents, GDPR applies to you regardless of where you're based. ISO 27001 certification doesn't make you GDPR compliant — but it demonstrates a mature approach to data protection that satisfies most enterprise procurement requirements around GDPR.
Many European prospects will ask for both ISO 27001 and evidence of GDPR compliance (DPA, RoPA, privacy notices). These can be tracked and maintained in the same compliance program.
The practical path forward
- Start collecting evidence now — regardless of which framework you target first, automated continuous evidence collection is the foundation of both.
- Map to both frameworks from day one — if your tooling supports it, there's no reason to limit evidence collection to one framework.
- Pick your first audit based on your customers — SOC 2 for US-first, ISO 27001 for EU-first, both if you're genuinely split.
- Engage the auditor early — both SOC 2 and ISO 27001 auditors have backlogs. Start the conversation 2–3 months before you want the report.
TraceLayer maps evidence to both SOC 2 and ISO 27001 simultaneously — connect your tools once and your readiness score updates for all 7 frameworks in real time. Score your current stack free to see where you stand today.
Start collecting SOC 2 evidence today
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