SOC 2 vs ISO 27001: Which Should Your SaaS Choose?

"We need SOC 2 or ISO 27001" is the line that ends deals. If a prospect has said this to you, you're not alone — it's now the default security ask from procurement teams at companies of any size. The question is which one to go for first.

The short answer: if your buyers are North American, start with SOC 2. If your buyers are European, start with ISO 27001. If you sell to both, you'll eventually need both — but they share more than 70% of the underlying controls, so you won't be starting from scratch the second time.

What Is SOC 2?

SOC 2 is an American standard developed by the AICPA. It's a voluntary audit framework that evaluates whether your security controls are designed and operating effectively. The output is a SOC 2 report — not a certificate, technically, but that's a distinction most buyers don't care about.

It's structured around five Trust Service Criteria: Security, Availability, Processing Integrity, Confidentiality, and Privacy. The Security criterion is mandatory; the rest are optional. Most startups pursue Security-only coverage initially.

SOC 2 comes in two types:

Type I: point-in-time assessment of whether your controls are designed correctly
Type II: assessment over 3–12 months of whether controls were operating effectively

What Is ISO 27001?

ISO 27001 is an international standard published by the International Organization for Standardization (ISO). Unlike SOC 2, it results in an actual certificate — issued by an accredited certification body and valid for three years (with annual surveillance audits).

It's structured around an Information Security Management System (ISMS) — a formal, documented system for managing information security risks across your organisation. The standard defines 93 controls across 4 domains (Annex A), but the unique angle is that you're expected to conduct a risk assessment and select which controls apply to your situation.

Key Differences

| Dimension | SOC 2 | ISO 27001 | |-----------|-------|-----------| | Origin | USA (AICPA) | International (ISO/IEC) | | Output | Audit report | Certificate | | Mandatory period | Point-in-time (Type I) or observation period (Type II) | 3-year certificate cycle | | Controls | 5 Trust Service Criteria | 93 controls across 4 domains | | Process emphasis | Evidence of control operation | ISMS as a management system | | Most recognised in | North America | Europe, Middle East, Asia-Pacific, UK | | Renewal | Annual or biennial audits typical | Annual surveillance + 3-year recertification | | Average cost | $20,000–$60,000 all-in | $25,000–$80,000 all-in |

Which Markets Require Which?

Go with SOC 2 if:

Your customers are US companies (especially US enterprises and mid-market)
You're selling into financial services, healthcare, or government in the US
Your procurement questionnaires mention "SOC 2 Type II report"
You want the fastest path to closing enterprise deals in North America

Go with ISO 27001 if:

Your customers are European (the UK, Germany, Netherlands, France, Nordics)
You're bidding on government or public sector contracts in the EU or UK
Your prospects mention "information security management system" or "ISMS"
You're in an industry where ISO 27001 is the norm (telecoms, manufacturing, critical infrastructure)

The honest answer for most VC-backed SaaS companies: Your first customers are likely American, your Series A investors are likely American, and your earliest enterprise deals will be American companies asking for SOC 2. Start there.

Timeline and Cost Comparison

SOC 2 timeline:

Type I: 2–4 months from kick-off to report
Type II: 6–14 months (depending on observation period length)

ISO 27001 timeline:

Stage 1 audit (documentation review): 2–4 months of prep
Stage 2 audit (effectiveness review): 4–6 months after stage 1
Total: 8–14 months from kick-off to certificate

ISO 27001 tends to take longer because it requires building an ISMS, completing a formal risk assessment, and generating documentation artefacts (risk register, Statement of Applicability, treatment plans) that SOC 2 doesn't explicitly require.

Cost breakdown (typical for a 20–100 person SaaS startup):

| Item | SOC 2 Type II | ISO 27001 | |------|--------------|-----------| | Auditor / certification body fees | $15k–$40k | $20k–$50k | | Compliance software | $6k–$30k/yr | $6k–$30k/yr | | Pen test (often required for both) | $5k–$15k | $5k–$15k | | Policy writing | $0–$8k | $0–$10k | | Internal time cost | 200–400 hrs | 300–600 hrs |

Can You Do Both?

Yes, and if you're selling globally, you'll need to. The good news: there's significant overlap between SOC 2 CC controls and ISO 27001 Annex A controls. A 2022 mapping by the AICPA shows that roughly 70–80% of SOC 2 CC requirements have a direct ISO 27001 equivalent.

This means:

If you do SOC 2 first, your evidence (CloudTrail logs, access reviews, branch protection) will largely satisfy ISO 27001 requirements too
Your policies written for SOC 2 (access control, incident response, encryption, vendor risk) map directly to ISO 27001 Annex A clauses
The additional work for ISO 27001 after SOC 2 is primarily: completing the formal ISMS documentation, conducting a risk assessment, and producing a Statement of Applicability

The optimal sequence for a global SaaS company: SOC 2 Type I (months 1–3) → SOC 2 Type II observation period begins (months 3–9) → start ISO 27001 prep in parallel (months 6–9) → SOC 2 Type II report (month 9) → ISO 27001 certification (month 12–14).

Which Should You Choose?

If you're reading this and you have a US enterprise deal on the line: get SOC 2. It's faster, it's what US buyers know, and your auditor relationship will be simpler.

If you're European-first or already closing EU enterprise deals: get ISO 27001 — or at minimum ISO 27001 Stage 1.

If you're unsure: look at your last five lost deals and your next five biggest pipeline opportunities. What did they ask for? That's your answer.

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