ISO 27001 vs SOC 2: which do you need (or do you need both)?

ISO 27001 and SOC 2 are the two security credentials B2B buyers ask for most, and they overlap so much that teams often assume they're interchangeable. They aren't. One is a certification, the other is an attestation report, and choosing between them usually comes down to a single question: where are your customers?

The core difference: certificate vs report

• ISO 27001 results in a certificate. An accredited body audits your information security management system (ISMS) and, if it holds up, certifies it against the standard. You get a recognised certificate you can point to.
• SOC 2 results in a report. An independent CPA firm examines your controls against the Trust Services Criteria and writes an opinion. There's no "SOC 2 certificate"; there's a detailed report you share, usually under NDA.

That difference in form drives most of the others.

Scope: whole system vs specific services

ISO 27001 is organisation-wide by design. It certifies a management system, so it looks at how your risk management, policies and the 93 Annex A controls hang together across the defined scope, ideally the whole organisation. The Statement of Applicability sits at its centre.

SOC 2 is scoped to specific systems or services. It assesses the controls relevant to a particular product or platform against the criteria you've committed to. It's less about a company-wide management system and more about proving a specific service is trustworthy.

Geography: international vs North America

This is often the deciding factor.

• SOC 2 is the norm in North America. US enterprises and their procurement teams expect it, frequently a Type II.
• ISO 27001 is globally recognised and most often requested by international and European customers.

If your buyers are American, they'll ask for SOC 2. If they're spread across Europe and the rest of the world, they'll ask for ISO 27001. If they're both, you'll be asked for both.

The good news: heavy control overlap

Because they both come down to running sound security controls, ISO 27001 and SOC 2 share a large proportion of their requirements, commonly cited as somewhere between 40% and 80%, especially around risk management, access control, change management and incident response.

That overlap is the practical headline: the work you do for one carries most of the way to the other. They still require separate audits (a certification body for ISO 27001, a CPA firm for SOC 2), and each has unique elements, ISO 27001's formal management-system clauses, SOC 2's specific criteria and reporting, but you are not starting from scratch the second time.

So which should you choose?

• Selling mainly to US customers? Start with SOC 2 (and plan for Type II).
• Selling to European or international customers? Start with ISO 27001.
• Selling to both, or planning to? Pursue both, ideally on one control set so you evidence each obligation from the same foundation rather than building twice.
• Just need a fast, recognised baseline first? Cyber Essentials is quicker and cheaper than either, and a sensible stepping stone.

The trap is treating them as two separate projects with two separate evidence piles. The efficient path is one well-run set of controls, mapped to whichever frameworks your market demands. That's exactly what ResiliencePilot does: maintain your controls once and map the evidence to ISO 27001, SOC 2 and the rest. See the ISO 27001 solution, the SOC 2 solution, or book a demo.