A customer asks for proof of your security program. The conversation quickly turns into an alphabet soup: SOC 2, ISO 27001, sometimes both. Most companies don't choose a framework because they researched the options. They choose because a procurement team told them which one to get, and gave them a deadline.
That's not a bad starting point. But it helps to understand what you're actually building, because the two frameworks overlap more than they differ, and the decision shapes your audit timeline, your budget, and which deals you can close.
The core difference
SOC 2 is an attestation. A CPA firm examines your controls against the AICPA's Trust Services Criteria and issues a report. You share it under NDA with customers who ask. It's the default ask for US-based SaaS companies selling to other US businesses. (If you've been calling it a certification, read SOC 2 is not a certification, it's an attestation first — the distinction matters in sales conversations.)
ISO 27001 is a certification. An accredited certification body audits your Information Security Management System against a published standard and issues a certificate you can reference publicly. It carries more weight internationally, especially with European and enterprise customers that expect a formal management system, not just a control report.
The practical distinction: SOC 2 is flexible and scope-driven. You pick the criteria that matter, you define the boundary, and the auditor opines on that specific scope. ISO 27001 is more rigid. There's a required set of controls, a mandatory risk assessment, a Statement of Applicability, and a management review cycle. It's a bigger build, but it produces a more portable artifact.
Which one should you start with
If your customers are primarily US-based SaaS or technology companies, SOC 2 is almost always the first ask. It's faster to achieve, the scope is narrower, and a Type I report can unblock a stalled deal in weeks, not months.
If you're selling into Europe, financial services, or larger enterprises with global security teams, ISO 27001 often shows up instead of or alongside SOC 2. Some procurement teams specifically want the certificate, not a confidential report under NDA. It's a public, verifiable signal.
If you're not sure which you need, look at your pipeline. The security questionnaires your prospects send will tell you. We've never seen a company guess wrong when they actually read what their buyers are asking for.
Can you do both at the same time
Usually, yes. The overlap is significant. Access control, vendor management, incident response, encryption, change management — the underlying controls are largely the same. A well-designed program maps one control implementation to both frameworks instead of building two parallel programs.
The pieces that don't overlap are the ISO-specific requirements: the formal risk assessment, the Statement of Applicability, internal audit, and management review. Those get layered on top of the SOC 2 foundation, not built from scratch.
The combined effort is roughly ten percent more than SOC 2 alone, not double. Most companies that need both are better off designing for both from the start rather than completing SOC 2, celebrating, and then rebuilding for ISO 27001 six months later.
When sequencing makes more sense
If your timeline is tight and a specific deal needs a SOC 2 report now, start there. A Type I can be ready in six to ten weeks. ISO 27001 typically takes three to six months minimum, and the certification body's audit schedule can add lead time.
Get the SOC 2 done, unblock the deal, then use the controls you already built as the foundation for ISO 27001. Sequencing isn't a compromise. Sometimes it's just the faster path to both.
The framework isn't the strategy
SOC 2 and ISO 27001 are reporting mechanisms. The actual work — designing controls that fit your environment, writing policies your team will follow, fixing what's broken — is the same regardless of which framework sits on top. Pick the one your customers need, build the program once, and map it to whichever framework shows up next.
If you're weighing both frameworks or need to add one to an existing program, our SOC 2 and ISO 27001 service designs a single control set that satisfies both.