Let’s say you got certified with one of the toughest certifications, ISO 27001, and it wasn’t an easy task. What now? You’ve got to maintain the certification by conducting a regular ISO 27001 internal audit.

An ISO 27001 internal audit is when you conduct an audit internally within the organization to assess whether your information security management system (ISMS) satisfies the ISO 27001 standard. Conducting internal audits is crucial to ensuring that an organization’s information security management system (ISMS) complies with the standards of the ISO 27001 standard. An internal ISO 27001 audit is a methodical, unbiased examination of an organization’s ISMS to confirm compliance with the ISO 27001 standard.

In this article, we explain how internal audits work and how they help you be compliant with ISO 27001. And also learn how often to conduct an internal audit, what steps to take to conduct an audit, and how to complete one.

What is an ISO 27001 internal audit?

An ISO 27001 internal audit is a systematic and independent examination of an organization’s Information Security Management System (ISMS) to assess its conformity with the requirements of the ISO/IEC 27001 standard. The standards for performing an internal audit of an organization’s ISMS are outlined in clause 9.2 of the ISO/IEC 27001 standard. The provision states that qualified, impartial, independent auditors who are free from conflicts of interest must conduct internal audits at predetermined intervals.

During the internal audit, auditors review documentation, interview personnel, and observe processes to gather evidence on the implementation and effectiveness of the ISMS. They analyze how well the ISMS complies with the standard’s standards as well as the organization’s own rules and goals, and whether the controls, policies, and procedures defined in the ISMS are being followed consistently.

The internal audit process follows established guidelines and standards for the audit’s scope, frequency, and techniques. The audit must include suggestions for remedial and preventive measures, as well as the identification of non-conformities and potential for improvement. The findings, recommendations, and any action taken must be recorded.

By following these guidelines, an organization can ensure that its internal audits are successful in assessing the sufficiency and efficacy of its ISMS and pinpointing chances for improvement. This aids the firm in maintaining the confidentiality, precision, and availability of its information assets and in meeting ISO/IEC 27001 regulations.

Why to undergo an internal audit?

Any business that wishes to keep up an efficient information security management system (ISMS) and abide by the ISO 27001 standard must conduct an internal audit. Here are some explanations for why a company ought to do an internal audit:

Ensure ISO 27001 compliance: An internal audit assists a company in evaluating the ISO 27001 standard’s requirements against its ISMS. This guarantees that the firm is in compliance with the standards and can prove its dedication to information security.

Gaps and weaknesses can be found. An internal audit can find ISMS gaps and weaknesses that may not have been known before. This enables the company to fill these gaps and develop its ISMS by taking corrective and preventative measures.

Ensure constant progress: By highlighting areas for improvement and offering suggestions for increasing an organization’s information security posture, an internal audit aids in the ongoing improvement of an ISMS.

Satisfying stakeholder and customer expectations: Customers and stakeholders want businesses to secure their sensitive data with effective information security procedures. An internal audit enables a company to show that it is serious about information security and dedicated to safeguarding the data of its stakeholders and consumers.

Preparing for external audits: An internal audit helps a company prepare for external audits by identifying areas that auditors may examine. This, in turn, reduces the likelihood of non-conformities being found during an external audit by allowing the business to address any potential issues beforehand.

A business may ensure the efficiency of its ISMS and show its dedication to information security by conducting an internal audit. It helps to discover opportunities for development and provide insightful information about the organization’s information security posture.

How do I conduct an ISO 27001 Internal audit?

Conduct to internal audit

Identify the audit’s scope: The first step should be to select the processes, policies, procedures, and controls for the ISMS that will be audited. Determine the pertinent paperwork and the individuals in charge of each area. You should definitely know which ISO 27001 clauses and Annex A are similar and relevant to your certification, and then you have to choose an audit team that has the expertise, training, and experience required to carry out the audit.

Evidence collection: The auditor will gather evidence during an internal audit to back up their findings and judgments. Records, logs, and other material that shows how the organization’s ISMS is being used and maintained can be included in this proof.

The process for collecting evidence could include:

  1. Examining guidelines and regulations to make sure they are being followed.
  2. Interviewing staff members to determine their roles and responsibilities
  3. Examining system logs and access control records to confirm the security of the organization’s information assets
  4. Examining physical security measures to make sure they are implemented and working as planned
  5. Checking training records to make sure that staff members are getting the right information security policies and procedures training

Document review: Examining the organization’s policies, practices, and other paperwork to make sure they adhere to the standards of the ISO 27001 standard is known as document review. The auditor will check the company’s documentation to make sure it appropriately reflects the information security processes of the business and is full, current, and up-to-date.

During the document review process, there might be:

  • Examining the organization’s information security guidelines to make sure they adhere to ISO 27001
  • Examining the paperwork for the organization’s risk assessment and risk management to make sure it is complete and efficient
  • Examining the asset inventory of the company to confirm that all information assets have been recognized and categorized
  • Checking incident management records to make sure issues are being recognized, reported, and handled properly
  • Examining the organization’s business continuity and disaster recovery documentation to make sure it is ready for significant catastrophes or disasters

Conduct an internal audit: It’s now time for the internal auditor to start their evaluation. They will examine supporting materials and controls, speak with control owners in interviews, and see operational processes in action. All of this information will help the auditor determine if your organization’s goals are being attained and are in compliance with ISO 27001. They can use it to find any holes that need to be filled before the subsequent certification audit. 

Make an internal audit report: An internal audit will produce a report, just like an external audit report. The internal auditor summarizes their findings in this section, which should cover any non-conformities and action items. The internal audit report must incorporate the following components:

  • Introduction: The introduction should be providing a brief overview of the audit objectives, scope, and methodology.
  • Executive summary: This should provide a high-level summary of the audit finding and conclusions. It should highlight any major strengths and weaknesses during the audit and provide an overall assessment of the organization’s ISMS.
  • Audit findings: It should provide a detailed description of finding and conclusions of the audit. This section should be organized by the audit criteria and should include both positive findings and negative as well.
  • Non-conformities: This section should identify any instance such as where the organization is not meeting the requirements of the ISO 27001 standard. Each non-conformity should be clearly identified and include a description of non-conformity.
  • Annexes: Any further supporting material or proof that corroborates the audit findings and recommendations should be included in the annexes. Copies of the policies, processes, and other paperwork that were evaluated during the audit may be included in this.

Organizations can evaluate their security controls, identify vulnerabilities, and improve their overall information security posture by following the key steps outlined in this article, which include thorough planning, conducting comprehensive audits, documenting findings, and putting corrective actions into place. Internal audits for ISO 27001 provide several advantages, from risk reduction to assurance of compliance to ongoing improvement. These audits, whether carried out internally or with the aid of external auditors, are crucial for protecting sensitive data, fostering stakeholder confidence, and upholding compliance with global standards. Organizations may proactively repair security holes and safeguard their crucial assets in an ever-evolving environment by prioritizing internal audits.

Getting professional help in conducting an ISO 27001 Internal audit

To guarantee the efficiency and compliance of their ISMS, firms must conduct an internal ISO 27001 audit. Organizations may successfully carry out internal audits that pinpoint strengths, flaws, and opportunities for growth by following the guidelines presented in this article. Additionally, firms may save time, increase the accuracy of their audits, and guarantee compliance with ISO 27001 requirements by streamlining the internal audit process using CertPro. Organizations may enhance their internal audits using CertPro while maintaining a robust and efficient ISMS.


How should I prepare for an internal ISO 27001 audit?

Choosing the audit team, establishing the audit goals, developing an audit schedule, and identifying the required resources are all steps in the planning process for an internal ISO 27001 audit.

How frequently should an internal ISO 27001 audit be performed?

A variety of factors, including business size, complexity, and risk profile, may affect how frequently ISO 27001 internal audits are conducted. Internal audits should, however, be performed on a regular basis, such as annually or biannually.

Is it possible for me to perform an internal ISO 27001 audit myself, or should I contact a third party?

According to ISO 27001, an organization’s own staff can conduct internal audits as long as they have the necessary independence and expertise. However, given their objectivity and competence, many firms opt to work with external auditors. The choice is based on the organization’s resources, knowledge, and particular needs.

Why is it essential to perform an internal ISO 27001 audit?

Carrying out an internal ISO 27001 audit may assist firms in evaluating the efficiency of existing information security measures, spotting gaps in security, and ensuring conformance to the standard.Carrying out an internal ISO 27001 audit may assist firms in evaluating the efficiency of existing information security measures, spotting gaps in security, and ensuring conformance to the standard.

What are the essential steps in carrying out an internal ISO 27001 audit?

The planning, execution, documentation, findings, communication, and implementation of remedial measures are the essential phases in an ISO 27001 internal audit.



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