SOC 2 vs ISO 27001 — Which Should You Start With?

If your sales team is fielding security questionnaires from both US and European customers, you've probably been asked for both a SOC 2 report and an ISO 27001 certificate. The good news: they overlap about 80%. The bad news: they're not interchangeable.

Quick Comparison

| | SOC 2 Type II | ISO 27001:2022 | |---|---|---| | Who asks for it | US enterprise, B2B SaaS buyers | EU/UK enterprise, global companies | | What it is | Audit report (attestation) | Certification (accredited) | | Issued by | CPA firm | Accredited certification body | | Validity | 12 months (annual re-audit) | 3 years (annual surveillance audits) | | Time to complete | 4–6 weeks + 3–12 month observation | 5–7 months end-to-end | | Cost range (Year 1) | $70K–$90K all-in | $85K–$120K all-in |

When SOC 2 Comes First

Start with SOC 2 if:

• Your customers are mostly US-based — SOC 2 is the lingua franca of US enterprise security reviews. A Type II report closes deals.
• You need something fast — a Type I report can ship in 4–6 weeks. ISO 27001 takes 5–7 months minimum.
• You're pre-Series A — SOC 2's flexibility (choose which Trust Services Criteria apply) means you can scope tightly and keep costs down.

When ISO 27001 Comes First

Start with ISO 27001 if:

• Your customers are in the EU, UK, or APAC — ISO 27001 is the international standard. European procurement teams often require it explicitly.
• You're selling into regulated industries — healthcare (EU), financial services (UK FCA), government (EU member states) all prefer ISO.
• You want a certificate, not just a report — ISO 27001 gives you an accredited certificate you can display publicly. SOC 2 gives you a report you share under NDA.

The 80% Overlap

Here's why stacking both is cheaper than doing them separately:

• Risk assessment → required by both. Do it once, use it for both.
• Access controls → SOC 2 CC6.1–CC6.3 maps to ISO 27001 A.5.15–A.5.18. Same evidence.
• Change management → SOC 2 CC8.1 maps to ISO 27001 A.8.32. Same process.
• Incident response → SOC 2 CC7.3–CC7.5 maps to ISO 27001 A.5.24–A.5.28. Same runbook.
• Vendor management → SOC 2 CC9.2 maps to ISO 27001 A.5.19–A.5.22. Same register.
• Encryption → SOC 2 CC6.1/CC6.7 maps to ISO 27001 A.8.24. Same configuration.

When we implement SOC 2 first, adding ISO 27001 typically costs $5,000–$10,000 incremental setup plus the certification body audit fee. The controls are already built — we're mapping them to a different framework.

Our Recommendation

For most SaaS companies selling globally:

1. Start with SOC 2 Type II — faster, cheaper, closes US deals immediately.
2. Add ISO 27001 in parallel — reuse 80% of the controls, pay only the incremental gap.
3. Stack HIPAA or PCI if needed — each additional framework gets cheaper because the foundation is shared.

The incremental cost of each new framework drops 60–80% because you've already built the control foundation.

Try the Calculator

Not sure which frameworks you need? Our compliance cost calculator lets you select multiple frameworks and see the Year 1 estimate — including the overlap discount.