SOC 2 vs ISO 27001: which framework do you need?

SOC 2 and ISO 27001 are the two certifications buyers most often ask software companies to hold. They overlap heavily in what they require of your security program, but they differ in structure, geography, and what the end result actually is. Choosing which to pursue — or whether to pursue both — comes down to who's asking and where they are.

What each one actually is

SOC 2

SOC 2 is an attestation report produced by an independent auditor, based on criteria from the AICPA (the US accounting profession's standards body). Rather than a pass/fail certificate, the deliverable is a detailed report describing your controls and the auditor's findings. It's organised around "trust services criteria" — security is mandatory, with availability, confidentiality, processing integrity, and privacy as optional additions depending on what you're promising customers.

SOC 2 comes in two types. A Type I report assesses whether your controls are suitably designed at a single point in time. A Type II report — the one most enterprise buyers want — assesses whether those controls operated effectively over a period, typically several months to a year.

ISO 27001

ISO 27001 is an international standard for an information security management system (ISMS). The end result is a formal certificate, issued by an accredited certification body, confirming that your security management system meets the standard. Where SOC 2 produces a report a buyer reads, ISO 27001 produces a certificate a buyer can verify — a distinction that matters in some markets.

The key differences

• Geography. SOC 2 is most commonly requested by North American buyers. ISO 27001 is recognised internationally and is more often expected by buyers in Europe, the UK, and much of the rest of the world.
• The deliverable. SOC 2 gives you a report describing controls and findings; ISO 27001 gives you a certificate. Some procurement processes specifically want one or the other.
• Emphasis. ISO 27001 puts significant weight on having a documented, risk-based management system — ongoing processes for identifying and treating risk. SOC 2 emphasises the operating effectiveness of specific controls over a window of time.
• Cadence. SOC 2 Type II is typically renewed annually. ISO 27001 certification runs on a multi-year cycle with surveillance audits in between.

How much they overlap

The good news: the underlying security practices the two frameworks expect overlap substantially. Access controls, encryption, monitoring, incident response, vendor management, and staff security training show up in both. In practice, a company that has done the work for one is a long way toward the other. This is exactly why modern compliance automation platforms let you map a single control to multiple frameworks — so the second certification costs far less effort than the first.

Which should you pursue first?

There's no universal answer, but these rules of thumb hold up well:

• Your buyers are mostly North American → SOC 2 (usually Type II) is typically the first ask, and often the faster path to unblocking a deal.
• Your buyers are mostly international, or European → ISO 27001 is more likely to be expected and recognised.
• You sell broadly across both → many companies pursue SOC 2 first for speed, then add ISO 27001, reusing most of the same control work.
• A specific deal is driving this → ask the customer exactly what they require. Procurement teams are usually specific, and building to their actual requirement beats guessing.

The bottom line

SOC 2 and ISO 27001 aren't competitors so much as two recognised ways of proving the same underlying thing to different audiences. Let your customers' geography and their explicit requirements drive the order, and choose tooling that treats both as a shared foundation rather than two separate projects.