ISO 27001 vs. ISO 27701: What's the difference? (security ISMS vs privacy PIMS)

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ISO 27001 and ISO 27701 are related but not interchangeable. 27001 is the international standard for an information security management system (ISMS). 27701 is a privacy extension that builds on 27001 to form a privacy information management system (PIMS).

Related guides:

• Ultimate guide to ISO 27701
• How GDPR and ISO 27001 work together
• ISO 27001 collection

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Key takeaways

• ISO 27001 = certifiable security management system + Annex A controls.
• ISO 27701 = privacy extension to 27001/27002; requires an underlying ISMS.
• 27701 does not replace GDPR or other privacy laws.
• Many SaaS vendors start with 27001, then add 27701 when privacy diligence intensifies.

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Quick comparison

	ISO 27001	ISO 27701
Primary goal	Protect information (CIA)	Manage privacy of PII
System	ISMS	PIMS (extends ISMS)
Certifiable alone?	Yes	No—extends 27001 program
Typical buyer question	“Are you ISO 27001 certified?”	“How do you govern privacy?”
Key artifacts	SoA, risk treatment, security policies	Privacy extensions, RoPA alignment, processor controls

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ISO 27001 focus

ISO 27001 emphasizes:

• Risk-based security controls (Annex A)
• Operational security evidence (access, logging, change, vendors)
• Certification via Stage 1 / Stage 2 audits

It is the default global assurance signal for information security.

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ISO 27701 focus

ISO 27701 adds:

• Controller vs processor role requirements
• Privacy-specific control objectives beyond baseline Annex A
• Alignment between security incidents and privacy incidents

It helps teams operationalize privacy governance in the same rhythm as security audits.

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Using them together

A practical combined program:

1. Certify ISO 27001 for core ISMS.
2. Extend SoA and policies for 27701 privacy controls.
3. Map GDPR accountability artifacts (RoPA, DPIA, DPA) to control owners.
4. Reuse evidence where security and privacy overlap (access, retention, subprocessors).

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Which should you choose?

Situation	Recommendation
Enterprise deals ask for security certification	Start with ISO 27001
Heavy EU personal data, DPA reviews, privacy teams involved	Plan 27701 extension
Need only SOC 2 today	SOC 2 + later 27001; add 27701 if privacy scope grows
GDPR fines risk is primary concern	Legal/privacy program first; use 27701 as structure, not sole answer

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Disclaimer (legal note)

Standards do not replace legal advice. Certification scope and markings depend on your certification body.