What is the fundamental difference?
ISO 27701:2025 is an international standard for Privacy Information Management Systems (PIMS). It provides a framework for managing personal data across any regulatory context and can be certified by an accredited certification body.
SOC 2 is a US-originated reporting framework developed by the AICPA (American Institute of Certified Public Accountants). It assesses service organisations against Trust Services Criteria, with privacy as one of five optional categories. SOC 2 results in an attestation report from a CPA firm, not a certification.
The distinction matters: ISO 27701 is a certification (pass/fail, valid for three years). SOC 2 is an attestation (an auditor’s opinion on your controls at a point in time or over a period).
How do they compare side by side?
| Aspect | ISO 27701:2025 | SOC 2 |
|---|---|---|
| Type | International standard (ISO/IEC) | US attestation framework (AICPA) |
| Outcome | Certificate (valid 3 years with annual surveillance) | Attestation report (Type I: point-in-time; Type II: period of 6–12 months) |
| Scope | Privacy management system covering PII processing as controller and/or processor | Service organisation controls across 5 Trust Services Criteria (Security, Availability, Processing Integrity, Confidentiality, Privacy) |
| Privacy focus | Core purpose — the entire standard is about privacy | Privacy is one of five optional categories. Security is always included; others are chosen based on relevance. |
| Geographic recognition | International — recognised globally through ISO accreditation mutual recognition agreements | Primarily US and North America. Growing international recognition but less established outside the US. |
| Regulatory alignment | Maps directly to GDPR through Annex D, and to other privacy frameworks through Annexes C and E | Aligned with US privacy practices (CCPA, state-level laws). No formal GDPR mapping. |
| Auditor | Accredited certification body (e.g. BSI, NQA, Bureau Veritas) | Licensed CPA firm |
| Management system requirement | Yes — requires a functioning PIMS with risk management, internal audit, management review and continuous improvement | No — assesses controls against criteria but does not require a formal management system |
| Standalone | Yes — standalone certification since 2025 | Yes — always standalone |
| Renewal | Annual surveillance audits; recertification every 3 years | New report required annually (Type II) |
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When should you choose ISO 27701?
ISO 27701:2025 is the stronger choice when:
- Your customers are primarily European or international — ISO 27701 is an internationally recognised standard with formal GDPR alignment. European procurement teams and regulators are more likely to recognise and accept it than a SOC 2 report.
- GDPR compliance is a priority — The standard’s Annex D maps directly to GDPR articles, providing a structured way to demonstrate compliance. SOC 2 has no equivalent GDPR mapping.
- You want a privacy-first certification — ISO 27701 is entirely focused on privacy. SOC 2 treats privacy as one of several optional criteria alongside security, availability and others.
- You need a formal management system — ISO 27701 requires and certifies a Privacy Information Management System with ongoing governance, risk management and continuous improvement. This provides a more robust operational foundation than a point-in-time or period assessment.
- Long-term value matters — A three-year certificate with annual surveillance is more cost-efficient than annual SOC 2 Type II reports over time.
When should you choose SOC 2?
SOC 2 is the stronger choice when:
- Your customers are primarily US-based — SOC 2 is the de facto standard for vendor assessments in the US market. US enterprise procurement teams request SOC 2 reports far more frequently than ISO 27701 certificates.
- You need to demonstrate security, not just privacy — SOC 2’s Trust Services Criteria cover security, availability and processing integrity alongside privacy. If your customers need assurance across all these areas, SOC 2 addresses them in a single report.
- You are a SaaS or cloud service provider selling into the US — SOC 2 Type II reports are table stakes for SaaS vendors in the US market. Without one, you may not pass initial vendor screening.
- Speed matters — SOC 2 Type I (point-in-time) can be achieved faster than ISO 27701 certification because it does not require evidence of a management system operating over time.
When do you need both?
Many organisations that operate internationally end up with both. The typical scenario:
- US customers require SOC 2 — Your US enterprise clients and SaaS buyers expect a SOC 2 Type II report.
- European customers require ISO 27701 — Your European customers, particularly those subject to GDPR, expect an internationally recognised privacy certification.
- You process data across jurisdictions — If you handle personal data from both US and EU subjects, both frameworks provide assurance to their respective markets.
The good news is that the two frameworks overlap significantly. Organisations that implement one will find that 40–60% of the controls and evidence carry across to the other.
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How do costs compare?
| Cost element | ISO 27701:2025 | SOC 2 Type II |
|---|---|---|
| Initial audit / report | £5,000 – £25,000 (Stage 1 + Stage 2) | £15,000 – £40,000 (CPA firm engagement) |
| Annual maintenance | £2,000 – £8,000 (surveillance audit) | £12,000 – £35,000 (new Type II report annually) |
| 3-year total (audit fees only) | £12,000 – £45,000 | £39,000 – £110,000 |
| Platform / tooling | £5,000 – £15,000/year | £5,000 – £20,000/year |
ISO 27701 is typically more cost-effective over a three-year cycle because the certificate is valid for three years with lighter annual surveillance, whereas SOC 2 requires a full new report every year.
Where do the frameworks overlap?
If you pursue both, significant effort can be shared:
- Risk management — Both require risk assessment and treatment. Your privacy risk register serves both frameworks.
- Access controls — User access management, authentication and authorisation controls apply to both.
- Incident management — Breach detection, response and notification processes overlap significantly.
- Vendor management — Subprocessor / third-party management requirements are similar.
- Data subject rights — Both frameworks address individual rights (access, deletion, correction), though ISO 27701 covers these more comprehensively.
- Policies and procedures — Privacy policies, data handling procedures and employee training can serve both frameworks with minor adjustments.
A compliance platform that manages both frameworks with shared controls prevents you from duplicating work and maintaining two separate sets of evidence for the same underlying practices.
Why choose ISMS.online for ISO 27701:2025?
- Purpose-built for ISO 27701:2025 — Pre-configured framework with all requirements and Annex A controls mapped and ready to implement
- Multi-framework support — Run ISO 27701 alongside SOC 2, ISO 27001 and GDPR with shared controls and evidence
- GDPR alignment built in — Direct mapping to GDPR through Annex D, supporting both certification and regulatory compliance
- Reduces duplication — If you need both ISO 27701 and SOC 2, shared controls are managed once and mapped to both frameworks
- Faster implementation — Pre-built templates, risk registers and SoA generation cut implementation time compared to building from scratch
- Evidence linking — Every control links to its policies, risks and evidence, giving both ISO auditors and CPA firms a clear trail
- Ongoing compliance — Dashboards and task management keep both frameworks current between audits and attestations
Need help deciding which framework is right for you? Book a demo and discuss your compliance strategy with our team.
Frequently Asked Questions
Does ISO 27701 replace SOC 2?
No. They serve different markets and audiences. ISO 27701 is internationally recognised, particularly in Europe. SOC 2 is the standard in the US market. If your customers span both geographies, you may need both. However, if your customer base is primarily European, ISO 27701 alone may be sufficient.
Can a SOC 2 report satisfy European customers?
Sometimes, but it is increasingly insufficient. European procurement teams prefer internationally recognised ISO standards. SOC 2 does not map to GDPR, has no formal accreditation by European bodies, and does not demonstrate a management system approach to privacy. For European customers, ISO 27701 provides stronger assurance.
Which is faster to achieve?
SOC 2 Type I (point-in-time assessment) can be achieved in 2–4 months. SOC 2 Type II requires a 6–12 month observation period. ISO 27701:2025 certification typically takes 3–12 months depending on your starting point. If you already have ISO 27001, adding ISO 27701 can be as fast as 3 months. For a first-time implementation, SOC 2 Type I is faster, but Type II and ISO 27701 are similar in timeline.
How much work carries over if I do both?
Approximately 40–60% of controls and evidence overlap between the two frameworks. Risk management, access controls, incident management, vendor management and data subject rights processes are largely shared. The incremental effort for the second framework is significantly less than building it from scratch.
Should I do ISO 27701 or SOC 2 first?
Start with whichever your most important customers require. If your immediate revenue opportunities are in the US, SOC 2 first. If they are in Europe or international, ISO 27701 first. If both markets matter equally, ISO 27701’s management system approach provides a stronger foundation that makes subsequent SOC 2 work easier, since the management system discipline carries across.
