Why Pursue Both?

The SOC 2 vs. ISO 27001 debate misses the point for many SaaS companies. The question isn't which one to get — it's whether you can afford to get both, and how to do it efficiently.

US-based enterprise buyers predominantly require SOC 2. European enterprise buyers and international companies — particularly in the UK, Germany, the Netherlands, and the Nordics — frequently require ISO 27001. If you're selling to both markets, you'll eventually need both certifications.

The [SOC 2 vs. ISO 27001 comparison](/blog/soc2-vs-iso-27001-which-certification) covers the differences in depth. This guide assumes you've decided to pursue both and focuses on how to do it without doubling your effort.

How Much Do They Overlap?

SOC 2 and ISO 27001 overlap significantly in substance but differ in structure, process, and audit model.

Substantial overlap: Both frameworks require controls in access management, cryptography, logging and monitoring, incident response, vendor management, business continuity, and change management. The underlying security program can largely satisfy both.

Key structural differences:

|---|---|---| The biggest practical difference: ISO 27001 requires a documented Information Security Management System (ISMS) — a formal, systematic approach to managing information security. SOC 2 doesn't require an ISMS in name, but the controls it evaluates are consistent with one. If you build an ISMS for ISO 27001, your SOC 2 evidence largely comes from it.

Mapping SOC 2 Criteria to ISO 27001 Annex A

ISO 27001:2022 Annex A contains 93 controls organized into four themes. Here are the major mappings to SOC 2 Common Criteria:

|---|---|

This mapping means a single technical control implementation satisfies both frameworks. An access control policy written to satisfy CC6 should reference ISO 27001 Annex A 5.15–5.18.

Shared Evidence and Documentation

When both audits examine the same time period, most evidence can be used for both:

Policies and procedures: Write each policy once, with references to both the SOC 2 criteria and ISO 27001 controls it satisfies. One access control policy, clearly mapped to both standards, satisfies both auditors.

Risk register: ISO 27001 requires a formal risk register and risk treatment plan. This directly satisfies SOC 2's CC3 (risk assessment) requirement. Build one risk register that maps to both.

Vendor assessments: Vendor risk management evidence serves CC9.2 for SOC 2 and Annex A 5.19–5.22 for ISO 27001. One vendor assessment program, one set of evidence.

Audit logs and monitoring evidence: CloudTrail logs, GuardDuty findings, access review records — all serve both audit programs.

Training records: Security awareness training completion records satisfy both SOC 2's CC1/CC2 and ISO 27001 Annex A 6.3.

Where Requirements Differ

Despite the overlap, there are areas where you need to specifically address ISO 27001 requirements that aren't directly required for SOC 2:

Statement of Applicability (SoA): ISO 27001 requires a document that lists every Annex A control, whether it's applicable, and if not, the justification. This doesn't exist in SOC 2. It's typically a spreadsheet or table that takes 4–8 hours to create but requires ongoing maintenance as your environment changes.

ISMS scope document: ISO 27001 requires a formal scope definition for the ISMS itself. This is similar to SOC 2's system description but follows a specific ISO format. Typically 1–3 pages.

Internal audit: ISO 27001 requires an internal audit of the ISMS before the certification audit. This is a formal review conducted by someone other than the area being audited. For a small company, this can be done by a consultant.

Management review: ISO 27001 requires a formal management review at planned intervals, with documented outcomes. Typically done annually before the surveillance audit. Outputs include decisions on ISMS improvements, resource needs, and risk treatment updates.

Audit Coordination: Separate or Combined?

You have two options:

Sequential audits: Complete SOC 2 first, then ISO 27001. Benefit: you learn your gaps from SOC 2 and can address them before ISO 27001. Drawback: more total time and potentially higher cost for separate audit engagements.

Simultaneous or closely-timed audits: Work with auditors to conduct both audits in the same time window, sharing evidence requests. Benefit: significant reduction in evidence collection effort and disruption. Drawback: requires coordination between your CPA firm (SOC 2) and your certification body (ISO 27001).

Some audit firms and certification bodies are integrated and can perform both. If you're starting from scratch, ask your auditors explicitly whether they can coordinate. The evidence sets are largely the same; the main difference is that the CPA firm issues a report while the certification body issues a certificate.

Timeline and Cost for Dual-Track Certification

Timeline: From standing start, expect 9–14 months to achieve both simultaneously.

• Months 1–3: Gap assessment, ISMS build, policy development
• Months 4–6: Control implementation and evidence collection (SOC 2 Type I can be pursued here)
• Months 7–12: SOC 2 observation period + ISO 27001 certification audit preparation
• Month 12–14: SOC 2 Type II audit + ISO 27001 Stage 1 and Stage 2 audits

Cost: Dual-track certification typically costs 30–50% more than single-track, not 100% more. The efficiency gain from shared evidence, policies, and the overlapping audit program is real.

Using SecureSpect for Dual-Track Compliance

SecureSpect's SOC 2 control checks generate evidence that directly supports ISO 27001 Annex A requirements. The continuous AWS and GitHub monitoring captures the access control, logging, vulnerability management, and change management evidence that both auditors will review.

When configuring SecureSpect for a dual-track program, tag your controls with both the SOC 2 criterion and the corresponding ISO 27001 Annex A control. This makes it straightforward to demonstrate to either auditor that a specific requirement is satisfied.