Framework Comparison · Audit & Attestation
SOC 2 vs ISO 27001: Which Does Your Business Need?
SOC 2 and ISO 27001 are the two security frameworks B2B buyers ask about most. They cover a lot of the same ground, but they are fundamentally different things: one is an attestation report, the other is a certification. Picking the right one comes down to who your customers are and what they put in their security questionnaires.
The short answer
If you sell B2B software to North American companies, buyers will most often ask for SOC 2. If your customer base is international, or a specific customer demands it, ISO 27001 carries more weight globally. The controls overlap heavily, so the work you do for one is most of the work for the other.
The core difference: attestation vs certification
SOC 2 (System and Organization Controls 2) is an attestation engagement governed by the AICPA (American Institute of CPAs). A licensed CPA firm examines your controls against the Trust Services Criteria and issues a report containing their professional opinion. There is no pass/fail "SOC 2 certificate" you can hang on a wall, you share the report itself, usually under NDA.
ISO/IEC 27001 is an international standard for an Information Security Management System (ISMS). An accredited certification body audits you against the standard and, if you conform, issues a certificate. That certificate is valid for three years, with annual surveillance audits in years one and two and a full recertification audit in year three.
| Criterion | SOC 2 | ISO/IEC 27001 |
|---|---|---|
| Governing body | AICPA (US accounting profession) | ISO / IEC (international standards bodies) |
| What you get | An attestation report with a CPA's opinion | A certificate from an accredited body |
| Who issues it | A licensed CPA firm | An accredited certification body |
| Based on | Trust Services Criteria (TSC) | The ISO 27001 standard + Annex A controls |
| Current version | TSC (2017, revised 2022 points of focus) | ISO/IEC 27001:2022 (93 Annex A controls, 4 themes) |
| Validity | Report covers a point in time (Type I) or a period, commonly 3-12 months (Type II) | 3-year certificate with annual surveillance audits |
| How it's shared | Report shared with customers, usually under NDA | Public certificate; Statement of Applicability shared as needed |
| Strongest in | North American B2B SaaS | International / global recognition |
SOC 2: the Trust Services Criteria
SOC 2 is built on five Trust Services Categories. Only the first is mandatory; you add the others based on what you promise customers:
- Security, the required category, also called the Common Criteria. Every SOC 2 report includes it.
- Availability, system uptime and resilience commitments.
- Processing Integrity, system processing is complete, accurate, and timely.
- Confidentiality, protection of information designated as confidential.
- Privacy, handling of personal information in line with your privacy notice.
SOC 2 comes in two report types. A Type I assesses whether your controls are suitably designed at a single point in time. A Type II assesses both the design and the operating effectiveness of those controls over a period, most buyers want a Type II.
ISO 27001: a management system, not just controls
ISO 27001 certifies that you operate a working ISMS, a documented, risk-driven program for managing information security, with leadership involvement, defined scope, risk assessment, and continual improvement. The current edition, ISO/IEC 27001:2022, lists 93 controls in Annex A grouped into four themes (Organizational, People, Physical, Technological), a reorganization of the 114 controls and 14 domains in the 2013 version. The emphasis is as much on the system for managing risk as on any individual control.
Which one should you pursue?
- Selling to US / North American companies? SOC 2 is what their procurement and security teams will most often ask for.
- Selling internationally, or to enterprises with global footprints? ISO 27001 is more widely recognized outside North America.
- A specific deal is blocked on it? Do whichever one the customer named. That's the fastest path to revenue.
- Want both eventually? Common, and efficient, the underlying controls (access management, change management, vendor risk, monitoring, incident response) overlap heavily, so doing one builds most of the evidence for the other.
Get audit-ready before you spend on the auditor
Most of the cost and delay in SOC 2 isn't the audit, it's discovering control gaps the week before. The Strondex SOC 2 Checklist walks you through the Trust Services Criteria control by control, in plain English, with what evidence each one needs. The same access, change, vendor, and monitoring controls map directly to ISO 27001 Annex A.
Frequently asked questions
Is SOC 2 a certification?
No. SOC 2 is an attestation performed by a licensed CPA firm; it produces a report with the auditor's opinion, not a pass/fail certificate. ISO 27001 is what produces a certificate.
Which is better, SOC 2 or ISO 27001?
Neither is universally better. SOC 2 is the default ask in North American B2B SaaS; ISO 27001 has broader international recognition. Pick based on your customers, and know that the control work overlaps if you later want both.
How long is an ISO 27001 certificate valid?
Three years, with annual surveillance audits in years one and two and a recertification audit in year three.
What's the difference between a SOC 2 Type I and Type II?
Type I assesses control design at a point in time. Type II assesses design and operating effectiveness over a period, commonly 3 to 12 months. Most buyers want Type II.
Sources
- AICPA, SOC 2 and the Trust Services Criteria: aicpa-cima.com
- ISO/IEC 27001, Information security management systems: iso.org
This article is general educational content, not legal, audit, or compliance advice. Confirm scope and requirements with your auditor or certification body.