What Is an ISO 27001 Lead Auditor?
An ISO 27001 Lead Auditor is a professional who plans, leads and reports audits of an information security management system (ISMS) against ISO/IEC 27001:2022, directing the audit team and concluding whether the organization conforms to the standard.
This guide explains what a Lead Auditor does, how an ISO/IEC 27001 audit works, how the role compares with Internal Auditor and Lead Implementer, and how to become one.
- ISO/IEC 27001:2022
- No formal prerequisites
- Exam in 4 languages
What does an ISO 27001 Lead Auditor do?
The Lead Auditor is responsible for the whole audit, from agreeing its scope with the client to signing the conclusion. Lead Auditors work in certification bodies (third-party audits), audit suppliers on behalf of their company (second-party audits) or lead their organization's internal audit program (first-party audits).
- Agree audit objectives, scope and criteria with the client
- Prepare the audit plan and assign work to the audit team
- Run the opening and closing meetings
- Collect objective evidence through interviews, observation, records and sampling
- Classify findings as nonconformities or opportunities for improvement
- Write the audit report and verify corrective actions
Three kinds of audit
-
First partyInternal audit
The organization audits its own ISMS, as required by clause 9.2 of ISO/IEC 27001.
-
Second partySupplier audit
A customer audits a supplier or partner that handles its information.
-
Third partyCertification audit
An independent certification body audits the ISMS to grant or keep ISO/IEC 27001 certification.
What a Lead Auditor checks in ISO/IEC 27001:2022
ISO/IEC 27001 is the international standard for information security management systems, published by ISO and IEC. An organization must meet the requirements in clauses 4 to 10, and the auditor checks each one with evidence.
- 4Context of the organization
- 5Leadership
- 6Planning
- 7Support
- 8Operation
- 9Performance evaluation
- 10Improvement
Annex A: 93 controls in four themes
- 37
- Organizational controls
- 8
- People controls
- 14
- Physical controls
- 34
- Technological controls
The organization decides which controls apply and justifies it in its Statement of Applicability. The 2022 version replaced ISO/IEC 27001:2013, whose 114 controls were regrouped and updated.
How an ISO 27001 audit works
Audits follow the guidance of ISO 19011 and, for ISMS audits, ISO/IEC 27007. These are the five stages a Lead Auditor manages.
-
1
Plan the audit
Agree objectives, scope and criteria, review the ISMS documentation and prepare the audit plan and team.
-
2
Review documentation (Stage 1)
In a certification audit, check the ISMS scope, risk assessment, Statement of Applicability and readiness for Stage 2.
-
3
Collect evidence (Stage 2)
Interview people, observe activities and sample records and controls to confirm the ISMS is implemented and effective.
-
4
Report findings
Classify major and minor nonconformities and opportunities for improvement, present them at the closing meeting and issue the report.
-
5
Follow up
Verify corrective actions. Certified organizations then have surveillance audits each year and recertification every three years.
Lead Auditor vs. Internal Auditor vs. Lead Implementer
| Feature | Internal Auditor | Lead Auditor | Lead Implementer |
|---|---|---|---|
| Main goal | Checks that the ISMS meets the organization's own requirements and ISO/IEC 27001 | Leads audits, including supplier and certification audits, and directs the audit team | Designs, implements and maintains the ISMS |
| Key question | “Are we doing what our ISMS says?” | “Does this ISMS conform to ISO/IEC 27001 and work in practice?” | “How do we build an ISMS that meets ISO/IEC 27001?” |
| Typical output | Internal audit report for management review | Audit plan, findings, nonconformities and audit conclusion | Scope, risk assessment, Statement of Applicability, policies and controls |
| Independence | Must not audit their own work | Independent from the organization being audited | Part of the team that builds the ISMS |
| CertiProf certification | I27001IA | I27001LA | I27001LI |
Skills an ISO 27001 Lead Auditor needs
-
Audit principles
- Plan and manage an audit program
- Apply the auditing guidance of ISO 19011
-
ISO/IEC 27001:2022 requirements
- Interpret clauses 4 to 10
- Know the 93 Annex A controls
-
Evidence and sampling
- Interview, observe and review records
- Judge whether controls are effective
-
Reporting and leadership
- Write clear, objective nonconformities
- Lead the team and the closing meeting
How to become an ISO 27001 Lead Auditor
-
Learn ISO/IEC 27001
Understand the ISMS requirements and the Annex A controls. CertiProf's Foundation (I27001F) covers them.
-
Learn how audits work
Study audit principles and practice internal audits. Internal Auditor (I27001IA) focuses on that role.
-
Get certified as Lead Auditor
Validate your knowledge with the CertiProf I27001LA online exam. There are no formal prerequisites.
-
Build audit experience
Join audits as a team member, then lead them. Certification bodies set their own experience requirements for the auditors they hire.
-
Keep your credential current
The certification is valid for 3 years and is renewed through CertiProf's renewal process.
The ISO 27001 certification path at CertiProf
Four certifications cover the main ISMS roles. Going for three? The ISO 27001 bundle includes Foundation, Internal Auditor and Lead Auditor for USD 350.
Career outlook
Lead Auditors are hired by certification bodies, consulting firms and organizations that hold or pursue ISO/IEC 27001 certification. Typical job titles include ISMS auditor, IT auditor, information security auditor and GRC specialist.
Median base salary for IT auditors in the United States, based on 234 salary profiles. Source: Payscale, updated July 16, 2026. Pay varies by country, experience and employer.
Who becomes a Lead Auditor
- Information security auditors
- IT auditors
- Compliance and GRC professionals
- ISMS managers
- Risk managers
- Cybersecurity consultants
- Security leaders and CISOs
- Management-system auditors
Get your ISO 27001 Lead Auditor certification
CertiProf ISO 27001 Lead Auditor (I27001LA)
40 multiple-choice questions · 60 minutes · 80% to pass (32 of 40) · no formal prerequisites.
- 100% online, any day
- English, Spanish, Portuguese or French
- 2 exam attempts
- Voucher instantly by email
- Open Badges 3.0, valid 3 years
USD 1802 attempts · voucher valid 6 months
Buy now · go to checkoutSee full exam detailsPlanning 3 ISO 27001 certifications? Bundle: USD 350Already have a voucher?
Start your ISO/IEC 27001:2022 exam in your language.
From certified Lead Auditors
I am happy to tell you that I have obtained a new certificate: Lead Auditor ISO 27001:2022 de Certiprof!
Segundo reto logrado gracias al Banco de Crédito BCP por las facilidades en obtener la certificación ISO 27001:2022 LEAD AUDITOR - I27001LA y a los amigos de CertiProf.Original in Spanish
Companies with CertiProf-certified professionals
Frequently asked questions
What does an ISO 27001 Lead Auditor do?
An ISO 27001 Lead Auditor plans and leads audits of an information security management system (ISMS) against ISO/IEC 27001:2022. They agree the audit scope, direct the audit team, collect evidence, classify findings as nonconformities or opportunities for improvement and write the audit conclusion.
What is the difference between an ISO 27001 Lead Auditor and an Internal Auditor?
An Internal Auditor checks conformity inside their own organization. A Lead Auditor leads audits, including supplier and certification audits, and directs the audit team. CertiProf offers both certifications: I27001IA for internal auditors and I27001LA for lead auditors.
What is the difference between an ISO 27001 Lead Auditor and a Lead Implementer?
A Lead Implementer designs and builds the ISMS. A Lead Auditor independently evaluates whether an ISMS conforms to ISO/IEC 27001 and works in practice. Many professionals hold both, but the same person should not audit an ISMS they implemented.
Do I need experience to take the ISO 27001 Lead Auditor exam?
No. CertiProf's I27001LA exam has no formal prerequisites and does not require previous auditing experience, but you should understand ISO/IEC 27001 requirements and audit principles. Certification bodies set their own experience requirements for the auditors they hire.
Is the CertiProf Lead Auditor certification based on ISO/IEC 27001:2022?
Yes. The I27001LA certification is based on ISO/IEC 27001:2022, the current version of the standard, which organizes Annex A into 93 controls in four themes: organizational, people, physical and technological.
How much does an ISO 27001 Lead Auditor earn?
Pay depends on country, experience and employer. As a reference, Payscale reports a median base salary of USD 87,742 for IT auditors in the United States, based on 234 salary profiles (updated July 16, 2026).
How do I get ISO 27001 Lead Auditor certified with CertiProf?
Buy the I27001LA exam voucher (USD 180) and take the exam online in English, Spanish, Portuguese or French. It has 40 multiple-choice questions, lasts 60 minutes and requires 80% to pass. The voucher includes 2 attempts and is valid for 6 months; the certification is valid for 3 years.
ISO/IEC 27001 is a standard published by ISO and IEC. CertiProf is not affiliated with either organization.