ISO 27001 vs SOC 2: which does your business need?

SOC 2 and ISO 27001 at a glance

The AICPA’s SOC 2 description criteria concern the service organization’s system. ISO/IEC 27001:2022 establishes requirements for an ISMS. Neither outcome automatically substitutes for the other.

Which should you pursue first?

Start with the decision your business needs to make, not a generic geographic rule. A customer in any region may specify either or both.

1. Read the actual request. Ask whether the customer accepts a SOC 2 Type I, requires Type II, or specifically needs ISO/IEC 27001 certification. Confirm scope, timing and whether a bridge or staged plan is acceptable.
2. Match the scope to your service. List the products, systems, teams, information and service providers that must be covered. A certificate or report only addresses its stated scope.
3. Assess readiness and resources. Identify existing security practices, evidence gaps, owners and the effort needed to operate controls consistently.
4. Plan with the assessors. Speak with a CPA firm about SOC 2 and a certification body about ISO 27001. Compare their scope, schedules, evidence expectations and fees before committing.

A practical example

A growing SaaS company has a prospect requesting a Type II report for its production service within a defined period, while another requests ISO 27001 certification. The team can confirm both requirements, map the production systems and review existing controls once, then plan separate examination and certification work. If a deadline cannot be met, the sales team should negotiate the milestones rather than promise that one result replaces the other.

Where preparation can overlap

Access reviews, risk assessments, incident response, vendor oversight and change management can support both efforts when their scope and timing align. Reuse is a starting point, not a guarantee: a document that helps demonstrate one requirement may not fully address another.

Plan a coordinated program

1. Make one inventory. Record systems, owners, vendors and information assets, noting which assessment each supports.
2. Map controls carefully. Link your actual controls to applicable requirements and identify gaps separately for each engagement. Confirm the mapping with qualified advisors.
3. Collect records once where appropriate. Store source, date, scope, owner and relevant review or approval; retain historical records needed for the agreed examination period.
4. Keep assessments independent. Coordinate evidence and scheduling while allowing the CPA firm and certification body to perform their own procedures and reach their own conclusions.

For a starting list of records, see our SOC 2 evidence checklist; for the larger readiness process, use the SOC 2 compliance checklist.

Common questions

Is SOC 2 a certification?

SOC 2 is an examination that produces an attestation report, not an ISO-style certificate. Read about Type I and Type II reports.

Does ISO 27001 cover SOC 2?

No automatic equivalence exists. Some security practices and evidence may be useful in both, but the scopes, requirements and independent assessment procedures differ.

Can the same firm perform both assessments?

It depends on the organizations involved, their qualifications, accreditation and independence requirements. Confirm this with the proposed CPA firm and certification body before planning a combined engagement.

Sources and further reading

• ISO: ISO/IEC 27001 and ISMS certification
• ISO: certification and accreditation
• AICPA: Trust Services Criteria

Educational guidance, not an audit opinion or legal advice. Requirements and acceptable evidence depend on the engagement and your organization.