SOC 2 or ISO 27001: which should you do first?

May 8, 2026

They overlap heavily, but they are not interchangeable. The right first choice depends on who is asking and where your buyers are.

What each one actually is

SOC 2 is an attestation report produced by a CPA firm against the Trust Services Criteria. It is a report you hand to a customer, not a certificate. ISO 27001 is an international certification of an Information Security Management System (ISMS), issued by an accredited certification body after an audit. One is a report; the other is a badge.

Who asks for which

In North America, SaaS buyers and procurement teams most often ask for "your SOC 2." In Europe and much of the rest of the world, ISO 27001 is the more recognised expectation. If your pipeline is dominated by one geography, that usually settles the first move.

Cost, effort, and overlap

The control sets overlap by a large margin — both cover access control, change management, risk, and monitoring — so the second framework is far cheaper than the first if you map evidence across them. ISO 27001 carries a recurring external-audit cost and a fixed three-year certification cycle; SOC 2 Type II recurs annually as a report over a period.

Practically: pick the one your buyers ask for first, build the ISMS and evidence well, then add the second as a mapped delta rather than a second from-scratch project.