ISO 27001 vs SOC 2: which certification should European SaaS pursue?
ISO 27001 is a global certification for Information Security Management Systems (ISMS). SOC 2 is a US AICPA attestation on controls at a service organization. ~60% control overlap. ISO is market standard in Europe/Asia. SOC 2 is market standard for US enterprise SaaS buyers. Many European SaaS do both.
Side-by-side
| Dimension | ISO 27001 | SOC 2 |
|---|---|---|
| Type | Certification (issued by accredited CB) | Attestation (issued by licensed CPA firm) |
| Standard body | International Organization for Standardization (ISO) | American Institute of Certified Public Accountants (AICPA) |
| Geographic recognition | Global — strongest in Europe, Asia, Middle East | Global — strongest in US, Canada |
| Core requirement | ISMS with 93 Annex A controls (2022 version) | 5 Trust Services Criteria: Security, Availability, Processing Integrity, Confidentiality, Privacy (Security always included) |
| Scope | Flexible — defined by organization with auditor acceptance | System description drives scope; SOC 2 typically covers specific services/products |
| Audit form | Stage 1 (desktop review) + Stage 2 (on-site) | Type 1 (point in time) OR Type 2 (3-12 month operating effectiveness) |
| Report output | Certificate (valid 3 years) + surveillance audits annually | Attestation report (annual) — detailed findings shared under NDA |
| Typical cost (EU mid-market SaaS) | €25-80k year 1, €15-40k year 2+ | $30-120k year 1 Type 2, $20-80k year 2+ |
| Timeline to first report | 5-9 months from zero | 9-14 months to first Type 2 (including observation window) |
| Surveillance | Annual surveillance audits + recertification every 3 years | Annual report renewal required |
| Shared evidence rate with other framework | ~60% overlap with SOC 2 | ~60% overlap with ISO 27001 |
When to choose which
ISO 27001
Your primary market is Europe, Asia, Middle East, or commercially-mature markets that recognize ISO. You want a certification (not attestation). Your buyers include public-sector, regulated industries, or organizations with strict vendor-security programs. You want a 3-year certificate rather than annual attestation.
SOC 2
Your primary market is US (especially enterprise SaaS). Your buyers include US Fortune 1000, US healthcare, US financial services. You're willing to maintain annual renewal cadence. You're selling into US-centric security-questionnaire processes.
Both
You're a European SaaS with international or specifically US enterprise ambition. This is the most common scenario. Sequence: ISO 27001 first (builds the ISMS foundation), then SOC 2 second (~40% incremental effort because controls overlap).
The overlap
Access control, change management, incident response, vendor management, risk management, monitoring, vulnerability management — all appear in both. ISO's Annex A 93 controls map to SOC 2's Common Criteria with ~60% direct overlap. Evidence from one can support the other. Matproof's dual mapping uses one control library for both audits.
Key differences
- ISO 27001 focuses on the ISMS (governance + management system). SOC 2 focuses on controls at a specific service organization.
- ISO 27001 is a 3-year certificate with annual surveillance. SOC 2 is an annual attestation report.
- ISO 27001 has a defined standard (93 controls). SOC 2 has flexible criteria implemented per organization.
- ISO 27001 is internationally standardized. SOC 2 is US-originated but increasingly globally recognized.
- ISO 27001 is certifiable (pass/fail). SOC 2 Type 2 reports can include 'exceptions' while still being issued.
- ISO 27001 certification is issued by an accredited certification body (TUV, DEKRA, Bureau Veritas). SOC 2 is issued by a licensed CPA firm.
Frequently asked questions
If I have ISO 27001, do I still need SOC 2?+
Depends on markets. US enterprise buyers typically still want SOC 2 despite ISO 27001 — different report formats, different procurement processes. European buyers almost always accept ISO 27001. If you sell to both, pursue both. Incremental SOC 2 effort after ISO 27001 is ~30-40%, not 100%, because controls overlap.
Can I satisfy SOC 2 controls using ISO 27001 Annex A evidence?+
Largely yes. The overlap is ~60% for Common Criteria. Tools like Matproof dual-map the control sets so a single evidence item satisfies both. Gaps to fill for SOC 2: the Trust Services Criteria formalization, system description, CPA firm relationship, and the annual attestation cycle.
Which is better for enterprise deals?+
Follows the buyer's requirement. US F1000 procurement almost always requires SOC 2 Type 2 as a checkbox. European enterprise procurement almost always requires ISO 27001. Selling to both: have both. Missing either is often deal-blocking for the relevant buyer type.
What about SOC 2 Type 1 vs Type 2?+
Type 1 is a snapshot on a date. Type 2 covers a 3-12 month observation window. Most enterprise buyers require Type 2. Many European SaaS skip Type 1 and go straight to Type 2 after a 6-month observation window — faster path to usable evidence.
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