SOC 2 is a CPA attestation report about controls at a service organisation relevant to selected AICPA Trust Services Criteria; ISO/IEC 27001 is an international ISMS requirements standard that an external certification body can certify. Choose from customer geography and procurement needs, desired assurance, service and system scope, and the security management outcome—not from price tables that ignore scope.
Core distinctions
| Question | SOC 2 | ISO/IEC 27001:2022 |
|---|---|---|
| Output | Restricted-use attestation report with the service auditor's opinion and supporting descriptions/results | Certificate to a defined ISMS scope, plus audit findings handled with the certification body |
| Provider | Qualified CPA practitioner or firm under AICPA standards | External certification body; accreditation can add independent confirmation of competence |
| Subject | Controls at a service organisation relevant to applicable Trust Services Criteria | The organisation's information security management system |
| Scope | Defined system and service commitments in the description | Defined ISMS boundaries, entities, locations, processes and interfaces |
| Time | Type I addresses a specified date; Type II addresses a period and operating effectiveness | Ongoing management system assessed through the certification cycle |
| Public sharing | Report distribution and use are controlled | Certificate and scope statement can be shared, subject to certification-mark rules |
Do not call a SOC 2 report a certification or ISO certification a SOC-style attestation opinion.
SOC 2 Type I and Type II
A Type I report addresses the description and suitability of control design as of a specified date. A Type II report additionally addresses operating effectiveness over a specified period and includes tests and results. Buyers often ask for Type II because it provides period evidence, but the appropriate engagement depends on the user's need and the practitioner's advice.
Security uses the common criteria. Availability, processing integrity, confidentiality and privacy categories are included when relevant to the service commitments and engagement scope. A report should be read, not reduced to a logo: check the auditor's opinion, system boundary, period, subservice-organisation method, complementary user-entity controls, exceptions and management response.
ISO/IEC 27001 certification
ISO/IEC 27001:2022 requires an ISMS that manages information-security risk. Implementation includes scope, leadership, risk assessment and treatment, control selection, operational evidence, monitoring, internal audit, management review and improvement.
Certification is optional. ISO develops the standard but does not certify organisations; an external certification body performs the assessment. Check the certificate's legal organisation, standard edition, scope, sites, validity, issuer and accreditation rather than relying on a badge.
Which should a SaaS company choose?
Choose SOC 2 first when priority customers explicitly require a current SOC 2 report and need assurance about the defined service system. Choose ISO/IEC 27001 certification first when customers or tenders ask for an accredited certificate, the business wants an organisation-wide risk management system, or international recognition is the dominant need.
Pursue both when separate customer segments require them and the expected commercial value justifies two assurance mechanisms. Reuse governance, risk, access, change, incident, supplier, continuity and evidence processes, but keep each engagement's criteria, scope and auditor evidence requests explicit.
Do not promise a universal percentage of control overlap. Similar topics do not mean identical criteria, evidence, period or assurance conclusions.
Readiness questions
- Which exact customer, tender or board requirement drives the work?
- What legal entities, products, infrastructure, people and subservice providers must be in scope?
- Are service commitments and system descriptions supportable with evidence?
- Is the ISMS operating with risk owners, internal audit and management review?
- How long have key controls operated, and is evidence complete for the intended period?
- Are exceptions, incidents and corrective actions resolved or transparently described?
- Who provides independent assurance, and are competence and independence verified?
- How will reports, certificates and customer questionnaires be governed after completion?
Avoid common misstatements
- “SOC 2 compliant” can obscure the report type, period, scope and opinion.
- “ISO certified” should identify ISO/IEC 27001:2022, the certified organisation and scope.
- Neither output guarantees that no incident will occur.
- Neither automatically proves NIS2, GDPR or other legal compliance.
- Automation tooling can collect evidence but cannot issue the auditor's opinion or certificate.
For readiness, scope and control implementation, see our cybersecurity services.
Sources and review
This comparison was substantively reviewed on 8 August 2026. It removes generic costs and timelines and corrects attestation, certification, type, scope and criteria distinctions.
Robert Lozo, mag. iur., is a Partner at Vision Compliance specializing in EU regulatory compliance. He advises organizations on GDPR, NIS2, AI Act, and financial regulation, delivering audit-ready documentation and compliance roadmaps across regulated industries.