The short answer
ISO/IEC 27001 is an international standard for an information security management system (ISMS). An accredited certification body audits you against it and, if you pass, issues a certificate that is valid for three years, with annual surveillance audits in between.
SOC 2 is an attestation report. A licensed CPA firm examines your controls against the AICPA Trust Services Criteria and issues an opinion. The report is not a certificate, and it is usually shared under NDA during sales and procurement.
How they compare
| ISO/IEC 27001:2022 | SOC 2 | |
|---|---|---|
| What you receive | A certificate, plus a public listing with the certification body | An attestation report from a CPA firm, shared under NDA |
| Who audits | Accredited certification body | Licensed CPA firm |
| Scope | Your ISMS, which can cover the whole company or a defined part | The systems and services you define, against the criteria you select |
| Validity | Three years, with annual surveillance audits | Point-in-time (Type 1) or a period, usually 3 to 12 months (Type 2) |
| Most common with | Global enterprises, European customers, public tenders, regulated markets | US SaaS companies and service providers answering procurement reviews |
Which one buyers ask for
Ask the customer, not the internet. Procurement teams usually name the framework in the security questionnaire or the contract. As a rough pattern, US-based SaaS buyers tend to ask for a SOC 2 report, while European buyers, public-sector tenders, and some regulated industries ask for ISO 27001 certification. Many large companies accept either, provided the scope covers the service they are buying.
Scope is where most of the cost hides
Both frameworks depend on scope. An ISO 27001 certificate can cover only part of the organization, which is useful when one business unit is in scope for a tender. A SOC 2 report covers the systems you describe in the system description, so a narrow description can leave out the infrastructure a buyer actually cares about. Decide scope before you buy tooling.
Can you pursue both?
Yes, and many companies do. The controls overlap heavily: risk assessment, access management, change management, incident response, supplier management, and business continuity appear in both. The practical approach is to build one control set, map each framework's requirements to it, and collect evidence once. That approach is covered in our article on running one control set across multiple frameworks.
Ask your three largest prospects which framework they require, and what scope. Build toward that answer first, then extend the control set to the second framework using the mapping.
Frequently asked questions
Is SOC 2 a certification?
No. SOC 2 results in an attestation report, not a certificate. Some buyers loosely call it 'SOC 2 certified', but the correct term is 'SOC 2 report' or 'SOC 2 attestation'.
Does ISO 27001 certification expire?
The certificate is typically valid for three years. The certification body performs surveillance audits each year, and a recertification audit occurs at the end of the cycle.
Which is faster to get?
It depends on scope and starting point. A first SOC 2 Type 1 is often quicker than a first ISO 27001 certification, but a Type 2 requires an observation period. Plan both timelines before choosing.
Can I use ISO 27001 instead of SOC 2 for a US customer?
Sometimes. Some US buyers accept an ISO 27001 certificate in place of a SOC 2 report. Confirm this in writing with the customer before you rely on it.
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