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SOC 2 vs ISO 27001
SOC 2 and ISO 27001 are the two assurance standards a growing software company is asked for. They overlap heavily in what they require and differ almost entirely in what they produce and who asks for them.
The short answer
Choose by buyer, not by rigor. North American enterprise procurement usually asks for SOC 2; European and Asian buyers usually ask for ISO 27001. SOC 2 produces a report a customer reads under NDA. ISO 27001 produces a certificate anyone can verify. Companies selling into both markets eventually hold both, and one security program supports both.
| SOC 2 | ISO 27001 | |
|---|---|---|
| What you get | An attestation report from a CPA firm, shared under NDA | A certificate from an accredited certification body, publicly verifiable |
| Who issues it | A licensed CPA firm | An accredited certification body |
| Who asks for it | North American enterprise buyers, most often | European and Asian buyers, and international tenders |
| What is assessed | Controls against the Trust Services Criteria you select | A management system, plus Annex A controls you justify in a Statement of Applicability |
| Time to first result | Weeks for a Type I, three months of observation for a first Type II | Typically several months to Stage 2, depending on ISMS maturity |
| Cycle | Annual report, continuous observation windows with no gap | Three-year certificate with annual surveillance audits |
| Penetration testing | Not named in the criteria; expected in practice as CC4.1 and CC7.1 evidence | Not named in the standard; ISO 27002 guidance for A 8.8 and A 8.29 names it |
| Flexibility | You choose which Trust Services Criteria are in scope beyond Security | You justify control applicability, but the management system clauses are mandatory |
Choose SOC 2 when
- Your pipeline is North American enterprise and procurement is asking by name
- You need something in front of a buyer in weeks, which a Type I can do
- Your buyers want to read the detail of how controls are tested
Choose ISO 27001 when
- You are selling into Europe, the UK or Asia, where it is the default ask
- You want assurance a buyer can verify without reading a report or signing an NDA
- You are answering public tenders, where certification is often a hard gate
The overlap is larger than the comparison suggests. Access control, change management, vulnerability management, incident response, vendor management and monitoring appear in both. A company that has done one honestly is most of the way to the other, and the incremental cost of the second is far less than the first.
The real difference is what a buyer does with the output. A SOC 2 report is a document to be read: it contains the system description, the control matrix, the auditor's tests and the exceptions found. An ISO 27001 certificate is a fact to be checked: it says an accredited body found a conforming management system, with the scope stated on the certificate.
The mistake worth avoiding is choosing on perceived difficulty. Neither is harder in a way that matters. Choose the one your buyers ask for, build the program once, and add the second when a deal requires it.
Questions people ask
Should a startup get SOC 2 or ISO 27001 first?
Whichever your buyers ask for. If your pipeline is North American enterprise, SOC 2 first. If you are selling into Europe or answering international tenders, ISO 27001 first. The underlying security work is largely shared, so the first one carries most of the cost.
Is ISO 27001 harder than SOC 2?
Not meaningfully. ISO 27001 requires a management system with defined clauses, which feels heavier at the start. SOC 2 Type II requires evidence that controls operated across an observation window, which is heavier in the middle. Companies find the second framework far easier than the first regardless of order.
Can one penetration test satisfy both?
Usually, if the scope covers both the SOC 2 system description and the ISO 27001 ISMS scope, and the report is clear enough about method and severity for both audiences. Confirm the overlap before testing, because the two scopes are defined differently and rarely match exactly.
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