Organisations pursuing ISO certification for the first time often face the same question: should we go for ISO 9001, ISO 27001, or both? The answer depends on what you do, who your clients are, and what risks matter most to your business. This guide breaks down the two standards, highlights their overlap, and helps you make a practical decision.
What ISO 9001 Covers
ISO 9001 is the international standard for quality management systems (QMS). It provides a framework for consistently delivering products and services that meet customer expectations and regulatory requirements. First published in 1987 and most recently revised in 2015, it is the world's most widely adopted management system standard, with over one million certificates issued globally.
ISO 9001 focuses on:
- Understanding customer needs and organisational context
- Leadership commitment and quality policy
- Process-based approach to operations
- Monitoring, measurement, and continual improvement
- Management of nonconformities and corrective actions
What ISO 27001 Covers
ISO 27001 is the international standard for information security management systems (ISMS). It provides a systematic approach to managing sensitive company and customer information so that it remains secure. The standard was significantly updated in 2022, restructuring its Annex A controls and adding new ones for modern threats.
ISO 27001 focuses on:
- Identifying information assets and assessing risks to them
- Implementing controls to mitigate those risks (93 controls in Annex A)
- Ensuring confidentiality, integrity, and availability of information
- Incident management and business continuity
- Ongoing monitoring and improvement of the ISMS
Key Differences at a Glance
| Aspect | ISO 9001 | ISO 27001 |
|---|---|---|
| Primary focus | Quality of products/services | Protection of information |
| Risk approach | Risk-based thinking (embedded) | Formal risk assessment and treatment |
| Key deliverable | Customer satisfaction, process efficiency | Confidentiality, integrity, availability |
| Control framework | No Annex A equivalent | 93 controls across 4 themes (Annex A) |
| Statement of Applicability | Not required | Required |
| Common industries | Manufacturing, construction, services | IT, finance, healthcare, SaaS |
Where They Overlap
Both standards share a common high-level structure (Annex SL), which means their core clauses align closely. This is deliberate: ISO designed it so that organisations can integrate multiple management systems without duplication. Key areas of overlap include:
- Context of the organisation (Clause 4): Both require you to understand your internal and external environment, interested parties, and scope.
- Leadership (Clause 5): Top management must demonstrate commitment, establish policy, and assign roles and responsibilities.
- Risk-based thinking: ISO 9001 embeds it throughout; ISO 27001 formalises it with a risk assessment methodology and risk treatment plan.
- PDCA cycle: Both standards follow Plan-Do-Check-Act for continual improvement.
- Internal audit and management review (Clauses 9-10): Both require systematic evaluation and corrective action.
When You Need Both
For many modern service organisations, a single standard is not enough. You should seriously consider certifying to both ISO 9001 and ISO 27001 if your organisation falls into any of these categories:
- IT services and managed service providers: Clients expect both reliable delivery and secure handling of their data.
- Fintech and financial services: Regulators and clients demand quality processes alongside robust information security.
- Healthcare with digital records: Patient data protection (27001) must sit alongside quality of care (9001).
- SaaS and cloud companies: Your product is the service, and your service handles client data.
- Consultancies handling client IP: Quality of deliverables matters, but so does protecting what you learn.
Integrated Management Systems
If you need both standards, the most efficient approach is an integrated management system (IMS). Because ISO 9001 and ISO 27001 share the same high-level structure, you can maintain a single set of core documentation — one quality and information security policy, one internal audit programme, one management review process — with standard-specific additions where needed.
The benefits of an IMS approach include:
- Reduced documentation burden and administrative overhead
- Fewer internal and external audits (combined audits are possible)
- Consistent risk management across quality and security
- Clearer governance and accountability
- Lower total cost of certification
Our Recommendation
If your organisation delivers services and handles client data — which describes most modern businesses — we recommend pursuing both ISO 9001 and ISO 27001. Start with whichever addresses your most pressing business need or client requirement, then integrate the second standard within 12 to 18 months.
For organisations that primarily handle physical products with minimal data exposure, ISO 9001 alone may be sufficient. Conversely, pure technology companies whose product is a platform may prioritise ISO 27001 first.
Whichever path you choose, the most important step is starting. Use our free readiness assessment to see where you stand, or apply for certification directly if you already have a management system in place.