ISO 27001 vs. SOC 2: Which Compliance Framework Do You Need?
Consultant Manager
Six Sigma White Belt (AIGPE), Internal Auditor - Integrated Management System (ISO), Gold Medalist MBA, 8+ years in cloud and cybersecurity content
ISO 27001 vs. SOC 2: Which Compliance Framework Do You Need?
Almost every B2B SaaS company eventually faces the same question: ISO 27001, SOC 2, or both? The frameworks are sometimes treated as alternatives, but they are different artefacts produced by different audit regimes for different audiences. Understanding the distinction is the first step in deciding what your customers actually need from you.
The Fundamental Difference
The clearest way to think about it: ISO 27001 is an internationally recognised certification of a management system. SOC 2 is a US auditor's attestation report on the controls operating at a service organisation. They are not interchangeable.
| Property | ISO 27001 | SOC 2 |
|---|---|---|
| Issuing body | ISO / IEC, audited by accredited certification body | AICPA, audited by US-licensed CPA firm |
| Output | Certificate (yes/no) | Report (Type I or Type II) |
| Scope | The Information Security Management System | Selected Trust Services Criteria |
| Geography of dominance | Global, especially Europe / Asia | Primarily US-driven |
| Standard age | Published 2005, current 2022 | Published 2010, current 2017 with 2022 points of focus |
| Recertification cadence | 3-year cycle with annual surveillance | Annual report |
What SOC 2 Type I vs. Type II Means
SOC 2 has two report types and the difference matters for what your customers will accept.
- Type I — auditor's opinion on whether controls are designed appropriately at a point in time. Easier and faster to obtain
- Type II — auditor's opinion on whether controls are designed appropriately AND operating effectively over a defined period (typically 6-12 months)
Enterprise procurement teams overwhelmingly require Type II. Type I reports are mostly useful as an interim deliverable while the Type II observation window is running.
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The Five Trust Services Criteria
SOC 2 reports cover one or more of five Trust Services Criteria (TSC). Most organisations cover Security at minimum and add others by customer demand.
- Security (mandatory if SOC 2 at all) — protection against unauthorised access
- Availability — system meets agreed availability commitments
- Processing integrity — system processes data completely, accurately, timely, authorised
- Confidentiality — confidential information is protected per agreements
- Privacy — personal information handling matches the privacy notice
Each criterion adds audit scope. A SOC 2 Type II covering Security + Availability + Confidentiality is the most common configuration for B2B SaaS.
Control Overlap Between ISO 27001 and SOC 2
Both frameworks demand similar underlying controls because they protect against the same threat landscape. The overlap is high enough that a well-designed control set satisfies the bulk of both. AICPA and ISO have published mapping documents; commercial compliance platforms include the mappings as features.
Across customer engagements, we typically see 80-90% of controls counting towards both frameworks. The 10-20% that doesn't overlap is usually:
- ISO-specific: documented risk-assessment methodology, internal audit programme, management review process, statement of applicability
- SOC 2-specific: explicit subservice-organisation disclosures, complementary user-entity controls (CUECs), specific TSC-driven evidence
How to Choose
The correct framework is the one your customers ask for. Three patterns are most common.
| Customer base | Typical requirement | Recommendation |
|---|---|---|
| Primarily US enterprises | SOC 2 Type II | Start with SOC 2; add ISO when EU customers materialise |
| Primarily EU / global enterprises | ISO 27001 | Start with ISO; add SOC 2 when US enterprises materialise |
| Global enterprise customer base | Both | Run a unified programme with one control set |
| Healthcare-heavy customer base | HIPAA, then SOC 2 | HIPAA-aligned controls, then SOC 2 Type II |
| Public-sector or regulated EU | ISO 27001 + sector frameworks (NIS2, BSI) | ISO is the foundation |
Cost and Timeline Comparison
Both frameworks have similar cost profiles for first-time achievement. Indicative numbers for a 50-200-person SaaS company:
- SOC 2 Type II Year 1: $50k-$150k (audit $20-40k + readiness work + tooling)
- ISO 27001 Year 1: $60k-$180k (CB $10-30k + readiness work + tooling)
- Both Year 1: $90k-$220k (significant overlap means combined is less than sum)
Subsequent years drop substantially as the management system runs steady-state and audit fees represent the bulk of the recurring cost.
The Joint-Programme Approach
For organisations targeting both, run a single programme with mapped controls and parallel audits. The architecture:
- One control library mapped to ISO 27001 Annex A AND SOC 2 TSC
- One Statement of Applicability for ISO; one System Description for SOC 2
- One body of evidence shared across both audits
- Two audits, ideally same year, ideally same auditor (some firms hold both accreditations)
The cost saving versus running two separate programmes is typically 25-35%, and the operational saving over time is larger because you operate one ISMS rather than two parallel programmes.
How Opsio Helps
Opsio runs joint ISO 27001 / SOC 2 programmes as part of our request an ISO certification readiness review service. We design the control library, map evidence to both frameworks, integrate with cloud platform telemetry, and coordinate with the SOC 2 CPA firm and the ISO certification body. Customers pursuing both frameworks typically achieve them within 9-12 months from kickoff. We also provide Opsio's compliance-automation practice tooling so the steady-state operation produces evidence automatically rather than requiring annual evidence sprints.
For hands-on delivery, see NIST compliance services with Opsio.
For hands-on delivery, see ISO 27001 consulting.
For hands-on delivery, see multi-framework compliance gap analysis and roadmap.
About the Author
Consultant Manager at Opsio
Six Sigma White Belt (AIGPE), Internal Auditor - Integrated Management System (ISO), Gold Medalist MBA, 8+ years in cloud and cybersecurity content
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