ISO 22301 vs ISO 27001: Continuity vs Security Explained

The core difference between ISO 22301 and ISO 27001 is what each one protects. ISO 22301 is the international standard for a Business Continuity Management System (BCMS): it keeps the organisation operating, or recovering fast, when a disruption hits. ISO 27001 is the standard for an Information Security Management System (ISMS): it protects the confidentiality, integrity and availability of information. One is about surviving disruption; the other is about safeguarding information. They answer different questions, they are audited against different clauses, and the confusion between them costs organisations real money when they scope a project around the wrong one.

Because both are ISO management system standards built on the same skeleton, they look deceptively similar on paper — the same clause numbering, the same certification model, the same audit rhythm. That shared structure is exactly why they integrate so well, and also why people assume owning one means covering the other. It does not. Below we set out what each standard actually is, where they genuinely overlap, which one your organisation needs first, and how to run both as a single integrated management system without duplicating the work.

What ISO 22301 Is: Business Continuity

ISO 22301:2019 specifies the requirements for a Business Continuity Management System. Its purpose is resilience: the ability to continue delivering products and services at acceptable levels after a disruptive incident, and to recover the rest within defined timeframes. The disruption does not have to be technical. A key supplier collapsing, a flooded office, a pandemic that empties the building, or a cyber attack that takes systems offline are all in scope. ISO 22301 does not care what caused the outage — it cares whether the business can keep functioning.

The engine of the standard is Clause 8 (Operation), which is where the distinctive continuity artefacts live. The Business Impact Analysis (BIA) identifies which activities are critical and how long the organisation can tolerate their loss. From the BIA come the recovery objectives: the Recovery Time Objective (RTO), the maximum acceptable downtime before losses become unacceptable, and the Recovery Point Objective (RPO), the maximum acceptable data loss measured in time. Those objectives drive the continuity strategies and the business continuity plans, and the standard requires you to exercise and test those plans so you know they work before a real incident proves they do not. We cover the mechanics in depth in our business continuity planning guide.

What ISO 27001 Is: Information Security

ISO 27001:2022 specifies the requirements for an Information Security Management System. Its purpose is to protect information — whether digital, physical, or in people heads — against threats to its confidentiality, integrity and availability. Where ISO 22301 asks "how do we keep operating," ISO 27001 asks "how do we keep information from being disclosed, altered, or lost." The organisation identifies information security risks, decides how to treat them, and selects controls to bring risk down to an acceptable level.

The controls come from Annex A, which in the 2022 revision lists 93 controls grouped into organisational, people, physical and technological themes. Crucially, Annex A is not a checklist you implement wholesale. You select controls based on your risk treatment decisions and justify inclusions and exclusions in a Statement of Applicability. If you want the full picture of how the ISMS fits together, our explainer on what ISO 27001 is walks through the clauses and Annex A in plain language.

Key Differences at a Glance

• Objective: ISO 22301 protects the ability to operate; ISO 27001 protects information (confidentiality, integrity, availability).
• Central artefact: ISO 22301 is built on the Business Impact Analysis; ISO 27001 is built on the information security risk assessment and Statement of Applicability.
• Key metrics: ISO 22301 uses RTO and RPO and maximum tolerable period of disruption; ISO 27001 uses risk levels and residual risk against acceptance criteria.
• Scope of threats: ISO 22301 covers any disruption, technical or not; ISO 27001 covers threats to information specifically.
• Controls: ISO 27001 has a defined Annex A control set of 93 controls; ISO 22301 has no equivalent annex, driving requirements through Clause 8 instead.
• Typical owner: ISO 22301 often sits with resilience or operations; ISO 27001 usually sits with security or IT.
• Proof of readiness: ISO 22301 requires exercising and testing of plans; ISO 27001 requires monitoring, internal audit and control effectiveness review.

Where They Overlap

The first overlap is structural. Both standards follow the ISO Harmonized Structure (previously Annex SL), which means clauses 4 to 10 are common ground: context of the organisation, leadership, planning, support, operation, performance evaluation and improvement. Both are certifiable by an accredited body, both run on a three-year certification cycle with surveillance audits in between, and both use the Plan-Do-Check-Act model. This shared spine is why organisations already certified to one standard implement the second considerably faster — the management system machinery for policy, roles, internal audit, management review and corrective action is already built and simply extends to cover the new discipline.

The second overlap is substantive, and it lives inside ISO 27001 itself. Annex A includes two continuity-adjacent controls. Control A.5.29, information security during disruption, requires the organisation to maintain information security during and after a disruptive event — plans to protect confidentiality and integrity even when normal operations are broken. Control A.5.30, ICT readiness for business continuity, requires ICT continuity to be planned, implemented and tested against continuity objectives, and it explicitly expects those objectives to come from a business impact analysis. In other words, ISO 27001 reaches into continuity territory for the information and ICT dimension, but it does so from the security angle: A.5.29 is about keeping information secure during a crisis, while A.5.30 is about restoring the technology that information depends on.

Which One Do You Need?

Start from the risk that keeps you awake. If your dominant exposure is the loss, theft or corruption of information — customer data, intellectual property, regulated personal data — and your customers or regulators expect a recognised security assurance, ISO 27001 is the priority. It is also, in practice, the more commonly requested certification in supplier due diligence and tender questionnaires, so many organisations reach for it first for commercial reasons.

If your dominant exposure is the inability to operate — a business where downtime directly costs revenue, breaches contractual service levels, or triggers regulatory penalties under regimes like DORA or NIS2 — then ISO 22301 is the priority. Financial services, healthcare, logistics, manufacturing and critical infrastructure providers often face continuity obligations that a security certificate alone does not satisfy. And if you find yourself relying on ISO 27001 controls A.5.29 and A.5.30 to cover organisation-wide continuity, that is usually the signal you have outgrown what the ISMS can credibly claim and need a proper BCMS. It is worth being clear that business continuity is not the same as disaster recovery either; our piece on ISO 22301 versus disaster recovery unpacks why a technical recovery plan does not amount to business continuity.

Integrating Both as One Management System

Because the two standards share clauses 4 to 10, running them as separate silos duplicates most of the effort. The mature approach is an Integrated Management System (IMS) — one management system that satisfies both standards through shared machinery, with discipline-specific requirements layered on top. Our guide to integrated management systems covers the general pattern; the sequence below applies it specifically to combining a BCMS and an ISMS.

• Define one combined scope and context, mapping interested parties and their information-security and continuity requirements together (Clause 4).
• Establish shared leadership and a single integrated policy, or aligned policies, with clear top-management commitment to both disciplines (Clause 5).
• Run a coordinated risk process: keep the information security risk assessment and the Business Impact Analysis distinct in method, but feed both into one planning cycle (Clause 6).
• Consolidate common resources — competence, awareness, documented information control and communication — under a single support framework (Clause 7).
• Connect the operational layer: let the BIA inform ICT readiness so that ISO 27001 controls A.5.29 and A.5.30 are evidenced by the same continuity work required for ISO 22301 (Clause 8).
• Combine performance evaluation: one internal audit programme and one management review covering both systems, plus continuity exercising that also tests information-security resilience (Clause 9).
• Operate a single corrective-action and improvement process so findings from either discipline flow through the same loop (Clause 10).

Done well, integration means one internal audit instead of two, one management review, one document control system, and continuity exercises that double as evidence for your security controls. The BIA that anchors ISO 22301 becomes the input that satisfies ISO 27001 A.5.30, and the incident-response capability you build for security feeds the continuity response. The two standards stop competing for attention and start reinforcing each other — which is the whole point of the shared Harmonized Structure. Deciding which to certify first is a scoping question, but building them to fit together from the outset is what saves the duplicated audit and implementation cost later.