The question comes up in almost every compliance conversation: ISO 27001 or SOC 2? The short answer is that it depends on who your customers are and where you're trying to sell. The longer answer involves understanding what these frameworks actually produce — and they're more different than most people realize.
What They Are (and Aren't)
SOC 2 is an attestation report, not a certification. It's produced under the AICPA's SSAE 18 standard and issued by a licensed CPA firm. Your customers receive a report — typically 50-150 pages — that documents your controls and an auditor's opinion on them. SOC 2 Type 1 covers control design at a point in time. SOC 2 Type 2 covers operating effectiveness over a 6-12 month period.
ISO 27001 is an international standard (ISO/IEC 27001:2022) and it produces a certification. An accredited certification body audits your Information Security Management System (ISMS) and, if it passes, issues a certificate. That certificate has your company name on it and appears on the CB's public registry. You can put "ISO 27001 certified" on your website.
This distinction matters. A SOC 2 report is a confidential document you share under NDA. ISO 27001 certification is public.
Who Asks for Each
SOC 2 is the de facto standard for US-based B2B technology companies. Enterprise procurement teams, SaaS customers, and US investors know what it is and ask for it. If you're selling to US companies, especially in finance, healthcare, or enterprise technology, you will eventually need a SOC 2 report. There's no "instead" — they'll want the report.
ISO 27001 is more prominent outside the US — European customers, public sector procurement, and supply chain security requirements frequently specify it. Enterprise companies in regulated industries (especially those with global operations) may require it from vendors. It's also respected as a signal of mature security governance regardless of geography.
Many organizations pursue both, and there's meaningful overlap. ISO 27001's control set maps well to SOC 2's Trust Service Criteria. Getting one makes the other faster.
Timeline and Cost Reality
Both take longer than vendors will tell you.
SOC 2 Type 1:
- Readiness gap assessment and remediation: 2-4 months depending on existing security posture
- Audit: a few weeks
- Total from scratch: 3-6 months to get the report
SOC 2 Type 2:
- Same readiness phase, then a minimum 6-month observation period where auditors review evidence of controls actually operating
- Realistic timeline from scratch: 12-18 months to your first Type 2 report
ISO 27001:
- Scoping, risk assessment, policy development, implementation: 6-12 months
- Stage 1 audit (document review): a few days
- Remediation of Stage 1 findings: 4-8 weeks
- Stage 2 audit (implementation verification): 2-5 days on-site
- Total from scratch: 9-18 months to certification
- Then annual surveillance audits in years 1 and 2, plus recertification in year 3
Cost ranges for either framework: $25,000-$100,000+ depending on scope, company size, and how much remediation is required before you can pass an audit. Neither is cheap. Both are investments in your ability to close enterprise deals.
The Key Structural Difference
SOC 2 has no prescribed control set. The AICPA publishes Trust Service Criteria — security is required, availability, confidentiality, processing integrity, and privacy are optional — but how you implement controls is largely up to you. Your auditor evaluates whether your controls achieve the criteria.
ISO 27001 has Annex A: 93 controls across four categories (organizational, people, physical, technological). For certification, you must document a Statement of Applicability (SoA) that maps every Annex A control to your environment and explains which ones you've implemented and why others don't apply.
This makes ISO 27001 more prescriptive but also more transportable — two ISO 27001-certified companies have a baseline set of controls that auditors verified. Two SOC 2-compliant companies might have implemented those controls very differently.
How to Choose
Go SOC 2 first if:
- Your customer base is primarily US-based
- You're getting asked for it in sales cycles already
- You need the fastest path to a credible security artifact
- You're a SaaS company in a US-heavy market
Go ISO 27001 first if:
- You're selling into European markets or regulated supply chains that specify it
- You want a public certification mark (ISO 27001 is visible; SOC 2 is confidential)
- You're building a long-term ISMS and want a structured framework to operate against
- Your leadership understands that the process of building an ISMS is the point, not just the certificate
Do both if:
- You're past $5M ARR and selling to enterprise customers across geographies
- You have a dedicated security function that can manage the overhead of both
- Your customers include both US SaaS buyers and European or regulated enterprises
The frameworks overlap significantly. ISO 27001's Annex A covers much of the same ground as SOC 2's Common Criteria. Starting with one gives you a documented control set, risk assessment, and policy library that accelerates the second.
SOURCES
- AICPA, Trust Services Criteria for Security, Availability, Processing Integrity, Confidentiality, and Privacy (2017, updated 2022): aicpa-cima.com
- ISO/IEC 27001:2022, Information security, cybersecurity and privacy protection — Information security management systems — Requirements: iso.org/standard/27001
- ISO/IEC 27001:2022 vs. 2013 transition guidance: iso.org/standard/75652.html
- AICPA SOC 2 overview: aicpa-cima.com/resources/landing/system-and-organization-controls-soc-suite-of-services
Planning a compliance initiative and not sure where to start? Schedule a free consultation to talk through which framework makes sense for your business.
