ISO 27001 vs SOC 2
Both are security frameworks. Both come up in enterprise sales conversations. They answer different questions, satisfy different buyers, and produce very different pieces of paper.
The Short Answer
ISO 27001 is an international standard you get certified against — it proves you run a managed information security system, and it is recognised worldwide. SOC 2 is a US attestation report from a CPA firm — it proves your controls operated effectively over a defined period, and it is shared privately with customers. If you sell to US enterprises, SOC 2 gets asked for first. If you sell internationally or into regulated sectors, ISO 27001 carries more weight. Plenty of companies eventually hold both.
Side by Side
Ten dimensions that decide which framework fits your situation
| Dimension | ISO 27001 | SOC 2 |
|---|---|---|
| Who publishes it | ISO/IEC — an international standards body | AICPA — the US accounting profession's body |
| What it actually is | A certifiable management-system standard (an ISMS) | An attestation report from a licensed CPA firm |
| Geographic pull | Global — strongest in EU, UK, APAC and regulated markets | US-centric, increasingly requested worldwide by US buyers |
| Control set | 93 Annex A controls across 4 domains (2022 revision) | Trust Services Criteria — Security plus 4 optional categories |
| Output you receive | A certificate, valid 3 years with annual surveillance audits | A report, usually a Type 2 covering a 3–12 month window |
| Who can see it | Publicly referenceable — you can put the certificate on your site | Restricted-use — shared under NDA, not published |
| Process, not just controls | Requires a documented ISMS, risk assessment and management review | Assesses controls against criteria; no management-system mandate |
| Typical first-year investment | Roughly $15k–$50k+ depending on scope and whether you use a tool | Roughly $20k–$60k+ including audit fees and readiness work |
| Typical timeline to first result | 6–12 months from kickoff to certification | 3–6 months to a Type 1; Type 2 needs a 3–12 month observation window |
| Renewal cadence | Surveillance audits annually, recertification at year 3 | Annual re-audit, commonly on a rolling 12-month period |
Cost and timeline figures are indicative ranges for a small to mid-sized SaaS company and vary with scope, headcount, existing controls and whether you use automation. They are not quotes.
What ISO 27001 proves
That your organization runs a managed information security system: you understand your risks, you have controls mapped to them, and you review and improve both on a schedule. The certificate is the output, but the management system is the point.
- A risk assessment process you actually run
- 93 Annex A controls, documented and owned
- Management review and continuous improvement
- A certificate you can publish and reference publicly
Watch out: the management-system requirements are where most first attempts stall. Controls are the easy half.
What SOC 2 proves
That an independent CPA firm examined your controls against the Trust Services Criteria and found them operating effectively over a defined period. It is evidence for customers, not a public badge.
- Security criteria, always — plus Availability, Confidentiality, Processing Integrity or Privacy if you choose
- Type 1: design at a single point in time
- Type 2: operating effectiveness across 3–12 months
- A restricted-use report shared under NDA
Watch out: Type 1 satisfies very few buyers. Budget for the Type 2 observation window from the start.
Which One Do You Need First?
The answer almost always comes from your buyers, not from the frameworks themselves
You are selling to US enterprises
SOC 2 is usually the first ask. US security teams and procurement functions are built around it, and a Type 2 report is often a hard gate in vendor review.
You sell internationally or into regulated markets
ISO 27001 travels better. EU, UK, and APAC buyers — plus healthcare, finance and government procurement — recognise the certificate immediately.
You are an early-stage SaaS with no framework yet
ISO 27001 gives you a management system that makes every later audit easier. SOC 2 is narrower and faster, but it does not build the governance layer.
You are answering a specific customer requirement
Read the security questionnaire you were sent. If it names SOC 2, that is your answer. If it names ISO 27001, that is your answer. Do not guess.
Where they overlap
The security controls overlap heavily — access control, change management, encryption, logging, incident response and vendor management all appear in both. That is why companies that hold one framework usually find the second significantly cheaper: the controls are already built, and what remains is the framework- specific scaffolding (an ISMS and risk process for ISO 27001; an observation window and evidence trail for SOC 2).
Frequently Asked
Is ISO 27001 harder than SOC 2?
They are hard in different ways. ISO 27001 demands a documented management system — risk assessments, policies, management reviews and continuous improvement. SOC 2 is narrower in scope but requires you to prove controls operated consistently over an observation window, which means evidence collection over months.
Do I need both?
Many mid-market SaaS companies eventually do. ISO 27001 satisfies international and regulated buyers; SOC 2 satisfies US enterprise procurement. Because the security controls overlap heavily, running the second one after the first is substantially cheaper than starting from zero.
What is the difference between SOC 2 Type 1 and Type 2?
Type 1 is a snapshot: it says your controls were suitably designed at a single point in time. Type 2 covers a period, typically 3 to 12 months, and says the controls actually operated effectively throughout. Buyers almost always want Type 2.
Can one assessment cover both frameworks?
The underlying security controls overlap significantly, so a single control assessment can inform both. What differs is the surrounding requirements — ISO 27001 needs an ISMS and risk process; SOC 2 needs evidence of control operation over the audit period.
Which is cheaper?
It depends more on scope, company size and whether you use automation than on the framework itself. Both are commonly in the tens of thousands of dollars in year one once audit fees, tooling and internal time are counted. A second framework added later usually costs far less than the first.
Where to Start, Whichever You Choose
Every path starts the same way: find out what you already have. Most teams overestimate their coverage and underestimate how many controls are partially implemented — documented but not operating, or operating but not evidenced.
Do not start with
- Buying a tool before you know your actual gaps
- Writing policies for controls you have not assessed
- Picking a framework because a competitor picked it
Start with
- A structured self-assessment against the real control set
- A ranked gap list with owners and target dates
- A decision on framework driven by named customer requirements
Do this today: run the free ISO 27001 self-assessment to score all 93 Annex A controls, then grab the gap analysis template to turn the results into a dated plan. It costs nothing and it is the same evidence base both frameworks draw on.
Know Your Gaps Before Your Buyers Ask
Free, structured, and mapped to the controls auditors actually test.
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