SOC 2 vs. ISO 27001: Which Certification Do You Need?

“We need a compliance certification for this deal” is a common trigger, and the immediate follow-up question — SOC 2 or ISO 27001? — doesn’t have a universally correct answer. It has an answer that depends heavily on what’s actually being asked for, and by whom.

What Each One Actually Attests

SOC 2 is an American Institute of CPAs (AICPA) framework, delivered as an attestation report from an independent CPA firm, evaluating an organisation’s controls against the Trust Services Criteria — Security, Availability, Confidentiality, Processing Integrity, and Privacy, though most engagements focus on Security as the mandatory baseline. It’s overwhelmingly the standard US enterprise buyers ask for, particularly in SaaS and technology procurement.

ISO 27001 is an international standard for information security management systems, certified by an accredited certification body rather than a CPA firm, and it’s the standard more commonly expected outside the US — Europe, the Middle East, and much of Asia in particular. It certifies that an organisation has a functioning information security management system, not just a fixed set of point-in-time controls.

The Deciding Factor Is Usually the Deal, Not the Framework

In practice, the choice rarely comes down to an abstract assessment of which framework is more rigorous — both are demanding, real certifications, not checkbox exercises. It comes down to what the actual blocking deal, RFP, or customer base requires. A company selling primarily into the US enterprise market will find SOC 2 requested far more often. A company with European or Middle Eastern customers, or operating in industries where ISO certifications are the established norm, will find ISO 27001 requested instead. Pursuing the “wrong” one first — technically excellent, but not the one the actual deal on the table asked for — solves a different problem than the one that’s urgent.

Why SOC 2 Type 2 Specifically (Not Type 1)

Within SOC 2, the Type 1 versus Type 2 distinction matters enough to be worth understanding before starting. Type 1 confirms controls are appropriately designed as of a specific date — useful as an interim milestone, but rarely what an enterprise buyer’s security questionnaire is actually asking for. Type 2 confirms those same controls operated effectively over a sustained period, typically 6 to 12 months of observation, which is what most enterprise procurement processes genuinely require, precisely because it demonstrates the controls hold up in practice rather than existing only on paper on the day of the audit.

What the Actual Path Looks Like

A structured SOC 2 engagement starts with a gap assessment — mapping current controls against the Trust Services Criteria and identifying every gap requiring remediation before an audit could plausibly succeed. Control implementation follows: access management, encryption, logging, vulnerability management, and incident response, built out to the standard an auditor will actually test against. Policy and procedure development comes next — written in language an auditor accepts, but just as importantly, in a form a team can actually operationalise rather than a document that describes a process nobody follows. Audit preparation and evidence packaging closes the process: automated evidence collection configured so evidence accumulates continuously rather than being assembled in a last-minute scramble, a pre-audit walkthrough, and the complete evidence package the auditor needs.

What This Unlocks in Practice

A B2B SaaS developer tools company with no formal security program had a $380,000-a-year enterprise deal blocked specifically on a SOC 2 requirement, with 18 distinct control gaps identified in the initial assessment and no compliance tooling in place at all. After a 6-month SOC 2 Type 2 engagement — all 18 gaps remediated, automated evidence collection via Drata reducing ongoing compliance overhead to roughly 3 hours a month — the blocked enterprise deal closed within two weeks of the SOC 2 report being issued. In the following quarter, seven additional enterprise deals closed citing the SOC 2 certification directly, and annual recurring revenue increased by $2.1 million. That’s the pattern worth internalising: the certification isn’t just a compliance cost, it’s frequently the thing directly unlocking revenue that was otherwise structurally blocked.

Making the Choice

If there’s a specific deal or RFP driving the decision, that requirement should settle which framework to pursue first — not a general sense of which one is more prestigious or rigorous. If both are eventually needed, as is common for companies selling internationally, multi-framework compliance programs that share controls and unified evidence across frameworks avoid duplicating the underlying work twice.