NIS2 vs ISO 27001: Which First?

← Back to the newsroom

Two names dominate European security conversations right now: NIS2, the EU directive that raises cybersecurity requirements for essential and important entities across critical sectors, and ISO 27001, the international standard for information security management systems (ISMS).

We are often asked which one an organisation should tackle first. The honest answer: it depends on your sector, your customers, and your timeline — and thanks to substantial overlap between the two, you rarely have to choose just one.

Start with the obligations, not the acronyms

NIS2 and ISO 27001 are different in kind. NIS2 is legislation — in Sweden the Cybersecurity Act (2025:1506), in force since 15 January 2026: if your organisation operates in one of the covered sectors and meets the size criteria, compliance is a legal obligation — with national enforcement and management accountability attached. ISO 27001 is a voluntary, certifiable standard: no law generally requires it, but customers increasingly do.

So the first question is not "which framework is better?" but "which obligations actually apply to us?" If you are in scope for NIS2, the law already applies and the regulatory timeline drives your work. If customers keep attaching security questionnaires to procurement — asking for ISO 27001 or equivalent evidence — commercial pressure may drive it instead.

What each one gives you

NIS2 reflects a broader regulatory shift towards stronger governance and greater accountability. It expects structured risk management, effective security controls, incident handling, and supply-chain security — and it places responsibility squarely on senior management. Boards are increasingly expected to oversee security, allocate resources, and ensure governance is embedded throughout the organisation.

ISO 27001 gives you a certifiable management system: a structured way to identify risks, select controls, assign ownership, and demonstrate continual improvement. Because it is certifiable, it doubles as a trust signal in sales processes — organisations that can quickly provide evidence of their security practices are better positioned to win business.

The overlap is your opportunity

Although these frameworks have different objectives, many of their requirements overlap. A risk assessment, an access control policy, or an incident response process may satisfy requirements across ISO 27001, NIS2, GDPR, and DORA simultaneously.

Understanding these commonalities changes the economics of compliance. Instead of running two projects, you implement the shared foundation once — risk management, policies, incident response, access control, supplier oversight — and map it to both frameworks. Duplication drops, consistency improves, and maintenance gets easier.

A practical way to decide

Ask three questions:

• Are we legally in scope for NIS2? If yes, that is your deadline-driven priority — with ISO 27001 as an effective vehicle for structuring the work.
• What are customers asking for? If procurement processes demand certification, ISO 27001 may come first commercially.
• Where is our overlap? Whichever you start with, build the shared controls once and let the second framework reuse them.

Think continuous, not annual

Both frameworks expect ongoing compliance rather than periodic exercises. Security risks evolve continuously, regulations change, and new threats emerge every day — compliance can no longer be treated as a once-a-year project. Organisations that monitor risks, maintain documentation, and collect evidence throughout the year are better prepared for audits, respond more effectively to change, and strengthen both their security posture and their resilience.