"SOC 2 or ISO 27001?" is a question every IT company faces when it enters the international market. Both frameworks deal with information security, both are requested by customers, and both cost money and time. This article compares SOC 2 vs ISO 27001 by nature, geography, structure, cost and timeline, and explains how to decide.
The core difference in two sentences
ISO 27001 is an international standard for an information security management system (ISMS). The company builds the system, an accredited certification body audits it against the standard and issues a certificate valid for three years with annual surveillance audits.
SOC 2 is an attestation report issued by an independent, licensed CPA firm in the United States under AICPA standards. The auditor evaluates the company's controls against the Trust Services Criteria (TSC) and states an opinion in a detailed report. There is no certificate; there is a report you share with customers.
Side-by-side comparison
| Aspect | SOC 2 | ISO 27001 |
|---|---|---|
| Nature | Auditor's attestation report | Certificate of conformity |
| Issued by | Licensed CPA firm (USA) | Accredited certification body |
| Primary market | USA, Canada; increasingly global SaaS | Europe, UK, Asia, public sector |
| Basis | 5 TSC criteria; Security is mandatory | Clauses 4–10 plus 93 Annex A controls |
| Flexibility | Company designs its own controls to meet criteria | Structured control list, applicability justified in the SoA |
| Deliverable | Detailed report (dozens of pages) under NDA | One-page certificate, public |
| Validity | Type 1: a date; Type 2: a period, renewed annually | 3 years with annual surveillance |
| Time to result | Type 1: 2–4 months; Type 2: 6–12 months | Typically 4–8 months |
| Typical audit fee (SMB) | Type 1: $8–20k; Type 2: $15–40k | Depends on body and size; usually below SOC 2 Type 2 |
Geography: who asks for what
The rule is simple. If your customers are American companies, especially enterprises, they will ask for SOC 2; they will view ISO 27001 positively, but rarely as a substitute. If your customers are European, British or public-sector organisations, they are used to ISO 27001 and do not always know how to read a SOC 2 report. The UK market also frequently asks for Cyber Essentials.
For Ukrainian outsourcing companies working with both the US and the EU, needing both is the typical situation. That is why we offer a SOC 2 + ISO 27001 package built on a shared control base.
Structure: criteria versus management system
SOC 2
The framework describes what must be achieved (for example, "the entity restricts logical access to the system to authorised users") but not how. The company designs its own controls and the auditor judges whether they are adequate and operating. This offers flexibility but demands expertise in control design. For details see Trust Services Criteria explained.
ISO 27001
The standard requires you to build a management system: organisational context, leadership, risk assessment, objectives, resources, internal audits, management review, continual improvement. Plus Annex A with a list of controls whose applicability you justify in the Statement of Applicability (SoA). It is a more process-oriented standard: it tests whether you can manage security as a system, not merely whether MFA is switched on.
What is in the report versus the certificate
This is a significant practical difference for your customers. An ISO 27001 certificate says "the system conforms to the standard". The customer's security team sees one page and the certification scope. A SOC 2 report is 40–100 pages of system description, control listing and test results for each control. US customers value exactly that detail: they decide for themselves whether any exceptions are acceptable. European customers often prefer the simplicity of a certificate.
Overlap: how much one helps the other
The good news is that a large share of controls is common to both. Access management, cryptography, backups, logging, change management, incident response, personnel security and supplier management are needed for SOC 2 and ISO 27001 alike. In our experience, a company that has prepared well for one framework covers most of the other's requirements.
The differences sit mainly in the "superstructure":
- ISO 27001 additionally requires a formal risk assessment methodology, internal audits, management review, an SoA and a continual improvement programme.
- SOC 2 requires a detailed system description, management's assertion, criterion-specific controls (for example SLA monitoring for Availability) and, for Type 2, continuous evidence collection throughout the period.
When to choose SOC 2
- Your main customers are in the United States or Canada.
- You are a SaaS company and SOC 2 already appears in security questionnaires or contracts.
- Customers want to see control details, not just the fact of certification.
- You need a fast first result; Type 1 can be achieved in 2–4 months.
When to choose ISO 27001
- Your main customers are in Europe, the UK, the Middle East or Asia.
- You take part in tenders where ISO 27001 is a formal qualification criterion.
- You need a public certificate you can display on your website.
- You want to build systematic risk management rather than a set of controls.
- You also process personal data of EU residents and are working on GDPR in parallel; the ISO management-system approach fits well with it.
When to do both
If you serve both markets, preparing simultaneously is the most efficient route. You design controls once, write a single policy set mapped to both frameworks, collect evidence once, and undergo two audits with different issuers: a CPA firm for SOC 2 and a certification body for ISO 27001. Total readiness cost ends up considerably lower than two separate projects, and the team goes through one implementation instead of two.
The recommended sequence in that case: gap analysis against both frameworks → implementation of shared controls → SOC 2 Type 1 and the ISO 27001 certification audit at roughly the same time → observation period → SOC 2 Type 2.
A short decision checklist
- Where are your customers and what requirements already appear in contracts and questionnaires?
- Do you need a public certificate or a detailed report?
- What is the horizon: a first result in three months or a system for years?
- Is there budget for two audits now, or is it better to start with one?
For the fundamentals see what SOC 2 is, and for the cost structure read how much SOC 2 costs.
Torn between SOC 2 and ISO 27001, or planning both? Tell us about your market, customers and current security posture and we will recommend the optimal path and scope the readiness work. Get a consultation.