ISO 27001 vs SOC 2: Which Does Your SaaS Startup Need? (2025)
The enterprise customer asked for “SOC 2 or ISO 27001.” Here’s what they actually want.
Most enterprise buyers who request a security credential are following a procurement checklist written by their security team, and that checklist often conflates ISO 27001 and SOC 2 as if they are interchangeable. They are not. ISO 27001 is a registration issued by an accredited registrar attesting that your information security management system meets an international standard. SOC 2 is an attestation report issued by a US CPA firm covering how your controls operated over time.
Which one you pursue first, and whether you eventually need both, determines 6 to 18 months of compliance work and USD 20K to USD 80K in year-one spend. This guide gives you the information to make that decision correctly.
12-Dimension Comparison: ISO 27001 vs SOC 2
Side-by-side on every dimension that matters for an early-stage SaaS decision.
| Dimension | ISO 27001 | SOC 2 |
|---|---|---|
| Standard body / origin | ISO/IEC (international) | AICPA (United States) |
| Geographic recognition | Global (preferred in EU, Asia, and government procurement) | Primarily North America; increasingly accepted globally |
| Type | Management system standard (ISMS) | Audit report (attestation by a CPA firm) |
| Output | Registration valid for 3 years, with annual surveillance audits | Type I report (point-in-time) or Type II report (6-12 month period) |
| Time to first certification / report | 9 to 18 months | 4 to 9 months (Type I: 2 to 4 months) |
| Year-1 cost | USD 40,000 to USD 80,000 | USD 20,000 to USD 50,000 |
| Ongoing maintenance | Annual surveillance audits + 3-year recertification | Annual renewal recommended; most enterprise customers require annual Type II |
| Controls framework | 93 controls across 4 Annex A themes | 5 Trust Service Criteria (Security mandatory + 4 optional) |
| Scope definition | Defined ISMS scope, which can be narrow (e.g., one product line) | Service boundary of the system being audited |
| Primary customer demand | EU enterprise, financial services, healthcare, government vendors | US enterprise, SaaS procurement, AWS/Azure Marketplace listings |
| Regulatory mapping | Maps to GDPR Art. 25 & 32, NIS2, DORA | Maps to HIPAA, CCPA, FedRAMP |
| When you need both | EU enterprise requires ISO 27001 | US enterprise requires SOC 2. Do SOC 2 first (faster), then ISO 27001 adds ISMS layer |
SOC 2’s 5 Trust Service Criteria
SOC 2 is organized around five Trust Service Criteria (TSCs). Only Security is mandatory. You select which additional criteria to include based on your product and what your customers need.
Access controls, encryption, availability SLAs, incident response, and vendor management. Every SOC 2 report must include this criterion.
Service uptime commitments. Required if customers rely on your system 24/7 and SLAs appear in contracts.
Customer data confidentiality. Required if you handle confidential customer information beyond personal data (trade secrets, legal documents, financial data).
Personal data lifecycle: collection, use, retention, and disclosure. Required if you process personal information in regulated contexts (separate from GDPR).
System processes data completely and accurately. Required for financial, healthcare, and payroll SaaS where input-to-output accuracy is critical.
ISO 27001 Annex A: 4 Themes, 93 Controls
ISO 27001:2022 reorganized its control set into four themes, a significant change from the 14-clause structure of the 2013 version. All 93 controls apply to any scoped ISMS, though implementation is risk-driven.
Policies, supplier relationships, threat intelligence, ICT readiness, business continuity
Screening, onboarding, disciplinary process, remote working, security awareness
Physical perimeter, clear desk/screen, visitor controls, off-site working, equipment disposal
Authentication, access rights, malware protection, network filtering, encryption, development security
Which One Does YOUR Startup Need?
Five common scenarios, each with a clear recommendation and the reasoning behind it.
US enterprise procurement teams universally recognize SOC 2. Fastest path to unblocking enterprise deals.
EU enterprise, especially financial services and public sector, frequently requires ISO 27001 and may not accept a SOC 2 report as a substitute.
SOC 2 is faster and cheaper. Start there to unblock US revenue. Begin ISO 27001 ISMS implementation in parallel; the controls overlap significantly.
AWS and Azure Marketplace security requirements are typically satisfied by SOC 2 Type II. Check your specific marketplace listing requirements.
Government procurement often requires ISO 27001. For US federal contracts, FedRAMP authorization supersedes both SOC 2 and ISO 27001.
The Real Cost
Both standards have significant but manageable year-one costs. The breakdown below reflects mid-market vendors (not Big 4 pricing, not discount vendors whose audits are rejected by serious enterprise buyers).
Ongoing annual costs after year 1: both standards require USD 10,000 to USD 30,000/year in surveillance audits or renewal fees, plus continued tooling and staff time.
Know your compliance gaps before the audit does
LexAudit generates a Compliance Health Score across SOC 2 Trust Service Criteria and ISO 27001 Annex A, with 60 signals evaluated monthly. Identify exactly which controls you are missing before entering a USD 20K to USD 80K audit engagement. USD 99/month, cancel anytime.
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Review Your Security Vendor Contracts in 60 Seconds
Before committing to an ISO 27001 or SOC 2 programme, your MSA, NDA, and security vendor agreements need contractual alignment with your chosen framework. BizLegal AI scans your security contracts for gaps in incident response obligations, audit rights, and subprocessor requirements. The scan is framework-specific, not generic.
Scan Your Security Contracts →Frequently Asked Questions
Can a SOC 2 Type II report substitute for ISO 27001 certification?
In US enterprise procurement, SOC 2 Type II is often sufficient. In EU enterprise sales (especially financial services, healthcare, or public sector), ISO 27001 registration is frequently required and a SOC 2 report may not be accepted as a substitute. For US federal procurement, FedRAMP authorization supersedes both.
Which should I do first if I need both?
SOC 2 first. It is faster (4-9 months vs 9-18 months), cheaper (USD 20-50K vs USD 40-80K), and more immediately recognized by US enterprise customers who generate most early-stage SaaS revenue. The controls you implement for SOC 2 (access management, encryption, incident response) map directly to ISO 27001 Annex A requirements, so the work is additive, not duplicative.
What is the difference between SOC 2 Type I and Type II?
Type I is a point-in-time report attesting that your controls are designed appropriately. Type II covers a 6-12 month observation period attesting that controls operated effectively. Enterprise procurement teams increasingly require Type II; Type I is often only accepted for initial vendor qualification. Budget 6-12 additional months after Type I to get your Type II.
Does ISO 27001 certification prove GDPR compliance?
No. ISO 27001 is a security management standard, not a privacy compliance framework. However, it is explicitly referenced in GDPR Article 25 (data protection by design) and Article 32 (security of processing) as evidence of appropriate security measures. Combined with a GDPR gap assessment, ISO 27001 certification is strong evidence of GDPR compliance posture.
How does LexAudit help with SOC 2 or ISO 27001 preparation?
LexAudit's 60-signal compliance health score maps your current controls against SOC 2 Trust Service Criteria and ISO 27001 Annex A requirements. It identifies gaps before your audit begins, so you enter the formal process knowing exactly what to fix, rather than discovering gaps during a USD 20K-USD 80K audit engagement.
Related guides: SOC 2 Compliance Checklist for SaaS · Compliance Health Score for SaaS · GDPR Compliance Checklist for SaaS · All Compliance Guides
SOC 2 Compliance Hub → Type I vs Type II breakdown, Trust Service Criteria, commercial consequences of missing SOC 2, and auditor selection guide.