Many organisations approach their ISO 27001 internal audit as an annual requirement, something to complete shortly before the external audit to demonstrate compliance. And technically, there is nothing wrong with that approach.

ISO 27001 Clause 9.2 requires organisations to conduct internal audits at planned intervals, and a single annual audit can meet that requirement. But there is a significant difference between carrying out an internal audit because the Standard requires it and using internal audits as a valuable business improvement tool. In our experience, organisations often get far more value from their internal audit programme when audits are spread throughout the year rather than concentrated into one annual exercise.

Why?

Because a rolling internal audit approach:

• Reduces pressure on key people and resources
• Gives the business more time to address risks, non-conformities and opportunities for improvement
• Helps management maintain better visibility of information security risks, corrective actions and continual improvement

An internal audit should not simply be something you complete to prepare for your external audit. It should help you understand whether your Information Security Management System (ISMS) is working effectively throughout the year.

The annual scramble

For many organisations, the internal audit happens a few weeks before the external audit. Suddenly, everything needs to happen at once:

• Interviews with multiple stakeholders need to be arranged
• Evidence needs to be collected and reviewed
• Findings need to be discussed and agreed
• Corrective actions need to be assigned and implemented
• Senior management needs to review and approve updates to policies, risks and improvement actions

Instead of being a useful opportunity to assess whether the ISMS is operating effectively, the internal audit can become a last-minute exercise to make sure everything is ready for the external auditor. Again, this approach is not necessarily wrong. For some organisations, it may work perfectly well. However, it can create unnecessary pressure, disruption and risk. Key people are pulled away from their normal responsibilities, issues may need to be resolved quickly, and there is very little time available to properly investigate findings and confirm that corrective actions have been effective. Rather than your ISMS operating like a well-oiled machine, the audit process can become an annual scramble to get everything in order. There is a better way.

 

The real value of an internal audit is what happens next

An internal audit is not just about finding non-conformities. The real value comes from what happens after the audit. A well-managed internal audit programme helps organisations:

• Check whether their security controls are working in practice
• Confirm that policies and procedures are being followed
• Identify weaknesses before they become bigger issues
• Improve visibility of information security risks
• Demonstrate evidence of continual improvement

Internal audits provide an opportunity to ask important questions:

• Are our controls still effective?
• Are risks being managed appropriately?
• Are processes being followed consistently?
• Are there areas where we could improve?

The outcome of an audit may be something relatively simple, such as updating a document or clarifying a procedure. However, some findings may require more time and consideration. For example:

• A risk may need to be reassessed
• A control may not be operating as intended
• Additional actions may need to be implemented
• Ownership may need to be agreed
• The effectiveness of corrective actions may need to be monitored

These activities take time. If your internal audit takes place just before your external audit, there may not be enough opportunity to properly investigate issues, implement improvements and demonstrate that actions have been effective. This can result in rushed fixes, incomplete evidence or corrective actions being closed before they have had time to deliver the intended improvement.

 

Confidence through clarity

Your ISMS should not sit quietly in the background waiting for audit season. It should be an active management tool that provides ongoing visibility of information security risks, issues, actions and improvements. When internal audits only happen once a year, that visibility can be limited. By spreading audits throughout the year, organisations create regular opportunities to:

• Identify issues earlier
• Discuss findings properly
• Assign ownership
• Track improvement actions
• Review whether risks need further attention

This gives those responsible for the ISMS more time to make informed decisions and helps ensure improvements are meaningful rather than rushed.

Why smaller, more regular audits often work better

A rolling internal audit programme does not need to be complicated. It simply means dividing the review of your ISMS processes and Annex A controls across the year, rather than trying to audit everything in one large exercise. For many organisations, this is much easier to manage. Instead of asking multiple people to step away from their normal roles for a large two- or three-day audit, smaller focused reviews can be planned throughout the year.

This approach:

• Reduces disruption
• Makes better use of internal resources
• Helps embed audit activity into normal business processes
• Avoids the pressure of a once-a-year compliance exercise

It also helps create a culture where internal audits are seen as opportunities for improvement rather than something to be endured.

Is your internal audit approach working for your business?

We are not suggesting that a single annual internal audit is wrong. For some organisations, it may be the right approach. However, for many businesses particularly those with smaller teams or limited resources, spreading internal audits throughout the year can be more practical, manageable and effective. A good internal audit should not create panic. It should provide confidence through clarity.

If your ISO 27001 internal audit currently feels like a once-a-year scramble, it may be worth stepping back and asking: Is our approach helping us manage information security effectively, or are we simply trying to satisfy the Standard?

We help organisations make ISO 27001 more practical, proportionate and easier to manage. If you would like to sense-check your internal audit programme or discuss how a rolling audit approach could work for your business, we would be happy to have a conversation.