Internal audit career guide
What a Certified Internal Auditor Actually Does
Internal auditors study how an organization works, where it can fail and whether its controls give leaders a reliable view of risk. The job reaches far beyond finance.
Written by Tanvi P., CIA, CFE, CISA, CAMS
Technical review by Shyam Sarrof, CPA (USA), CMA (USA), ACA, ACMA. Professional terminology checked against current IIA guidance.
The profession
What Does a Certified Internal Auditor Do?
A Certified Internal Auditor helps boards and management understand whether the organization is managing its most important risks. The work may focus on a business process, a technology platform, a regulatory obligation, a project, a subsidiary or a risk that crosses several departments.
The Institute of Internal Auditors describes internal auditing as independent, objective work that evaluates risk, controls and governance. The current Global Internal Audit Standards organize the profession around five domains: purpose, ethics and professionalism, governing the function, managing the function and performing internal audit services.
The title needs one clarification. An internal auditor is a professional role. A Certified Internal Auditor is someone who has earned the CIA credential issued by The IIA. People can work in internal audit before becoming certified, and many CIA holders later move into risk, controls, compliance, investigations, technology assurance or leadership roles.
If you are deciding whether to pursue the credential, start with what CIA certification means. This guide concentrates on the work itself.
Core responsibilities
What Are an Internal Auditor’s Main Responsibilities?
The exact assignment changes by organization, but a sound audit still follows the same logic. The auditor starts with objectives and risk, gathers evidence, reaches a supportable conclusion and communicates it to the people who need to act.
Understand the process
Learn what the activity is trying to achieve, who owns it, which systems support it and how work moves from beginning to end.
Assess risk
Identify events that could prevent the objective from being achieved, then focus attention on risks with meaningful impact and likelihood.
Plan the engagement
Set clear objectives, scope, criteria, timing and testing procedures. A focused plan keeps the audit connected to the risk that justified it.
Gather and test evidence
Use interviews, walkthroughs, system data, documents, observation and sampling to determine how controls were designed and how they operated.
Develop findings
Separate isolated errors from a control problem. Establish the condition, criteria, cause, risk or effect, and the evidence behind the conclusion.
Communicate results
Discuss facts with management, write clear reports and explain why a matter deserves attention without inflating its significance.
Monitor agreed actions
Track management’s progress and use a risk-based follow-up process to determine whether the agreed response has been completed.
The Standards describe this work directly: auditors plan engagements, conduct the work needed to develop findings and conclusions, collaborate with management on recommendations or action plans, communicate results and monitor those plans. That sequence is the backbone of the profession.
A working day
What Does an Internal Auditor Do Day to Day?
There is no fixed daily schedule. Fieldwork on a live engagement looks different from annual planning or an audit-committee reporting week. Still, most internal auditors move between conversations, evidence and writing.
A normal day may begin with a process walkthrough. The auditor asks a purchasing manager to explain how a vendor is approved, then traces one transaction through the system. Later, the auditor may review user access, analyze a payment file, test a sample, document the result and discuss an emerging issue with the audit manager.
Writing takes real time. Workpapers must show what was tested, what evidence was examined, what the auditor concluded and who reviewed the work. Findings also go through factual validation. That discussion is part of the audit, not an awkward meeting added at the end.
An illustrative workday might include: a 9:00 a.m. process interview, evidence review before lunch, transaction or access testing in the afternoon, and an hour documenting results. Another day may be almost entirely planning, data analysis or report discussion. The mix depends on the engagement stage and the auditor’s level.
The questions behind the testing
What Do Internal Auditors Look For?
Internal auditors are looking for a clear connection between objectives, risks, controls and evidence. A control can exist on paper and still fail in practice. A process can also produce a good result once while remaining exposed to a serious recurring risk.
- Are the process objectives clear?
- Have the main risks been identified?
- Are responsibilities and approvals defined?
- Are controls designed to address the stated risks?
- Did the controls operate during the period tested?
- Is management information accurate and timely?
- Are assets, systems and data protected?
- Are legal, regulatory and contractual duties met?
- Are unusual transactions investigated?
- Were earlier audit issues addressed?
The answer rarely comes from one document. Auditors compare what people say, what the procedure requires, what the system allows and what the underlying evidence shows.
Who owns what?
Internal Audit Does Not Own Management’s Controls
Internal audit can recommend an improvement and discuss whether an action plan addresses the finding. It should not quietly become the owner of the control it will later evaluate.
The IIA’s current Three Lines statement places internal audit in an independent third-line role. Management remains accountable for running the business and managing risk. The board or audit committee oversees internal audit, approves its mandate and supports its independence.
| Internal audit | Management | Board or audit committee |
|---|---|---|
| Evaluates governance, risk and controls | Owns business objectives, processes and risks | Authorizes and oversees internal audit |
| Provides assurance, advice and insight | Designs and operates controls | Supports the function’s independence |
| Communicates findings and monitors action plans | Decides and implements corrective action | Receives significant results and challenges management |
This boundary does not prevent collaboration. It makes the work credible. Internal audit can be constructive and practical while preserving the objectivity needed for future assurance.
From risk to follow-up
How an Internal Audit Engagement Works
An engagement is rarely as tidy as a seven-box diagram. Interviews may change the scope. New evidence can send the team back to an earlier test. The sequence below still gives a useful view of the work.
Learn what the activity must achieve.
Identify what could prevent that objective.
Define what the audit will cover and judge against.
Use walkthroughs, data, documents and testing.
Connect the condition, cause and risk.
Validate facts and issue clear conclusions.
Track management’s agreed response.
Illustrative EduDelphi teaching example
A Procure-to-Pay Audit in Practice
A company wants reasonable assurance that suppliers are legitimate, purchases are authorized, goods and services are received, invoices are accurate and payments are protected from error or fraud. Here is what the internal-audit team might do.
1. Identify the risks
Unauthorized vendors, conflicts of interest, duplicate invoices, weak approval limits, payment diversion and incompatible system access.
2. Walk through the process
Interview procurement, accounts payable, finance and system owners. Trace one purchase from vendor setup through payment.
3. Examine evidence
Review vendor approvals, purchase orders, receipt records, invoices, bank changes, payment files and relevant user access.
4. Test the controls
Select risk-based samples and use data analysis to look for duplicates, unusual vendor changes or transactions near approval thresholds.
5. Reach a conclusion
Decide whether the controls address the stated risks and operated during the period. A variation alone is not automatically a finding.
6. Communicate and follow up
Confirm the facts, explain the exposure and monitor the action management agrees to take. Management keeps ownership of the fix.
This is an original teaching example, not a client case study. Real scope and testing depend on the organization’s objectives, systems, risk assessment and audit mandate.
Different assignments
What Types of Audits Do Internal Auditors Perform?
Operational audits
Examine whether processes are controlled, efficient and connected to the organization’s objectives.
Financial-control audits
Review the controls supporting transactions, reporting, assets, reconciliations and financial information.
Compliance audits
Assess how the organization meets laws, regulations, policies, contracts and other obligations.
Technology and cyber audits
Evaluate access, change management, resilience, cybersecurity, data, cloud services and technology governance.
Fraud-related work
Assess fraud risk and prevention controls. A formal investigation may involve specialist investigators, legal counsel or forensic teams.
Governance audits
Examine decision rights, oversight, accountability, information flows, culture and board-level governance processes.
Third-party audits
Review supplier onboarding, contracts, service performance, concentration, security, continuity and monitoring.
Integrated audits
Connect business-process, financial and technology risks in one engagement rather than treating each area separately.
One auditor will not be an expert in every field. Internal-audit functions use specialists, guest auditors, co-sourcing and coordinated assurance when the audit universe demands knowledge the core team does not hold.
The method travels
What Does Internal Audit Look Like in Different Industries?
The risk-based method remains recognizable across sectors. The subject matter changes.
| Industry | Examples of internal-audit focus |
|---|---|
| Banking and financial services | Credit, financial crime, model risk, conduct, access, regulatory compliance and operational resilience. |
| Manufacturing | Production, quality, inventory, procurement, safety, maintenance and supply-chain continuity. |
| Healthcare | Patient-data privacy, billing, clinical governance, vendors, compliance and service continuity. |
| Retail and consumer business | Inventory loss, pricing, revenue, procurement, store operations, e-commerce and privacy. |
| Technology | Cybersecurity, access, software changes, cloud governance, privacy, AI governance and third parties. |
| Government and public sector | Public resources, procurement, program outcomes, compliance, accountability and value for money. |
A bank auditor and a manufacturing auditor may use similar planning and evidence principles. Their audit criteria, systems, regulations and operational risks can be completely different.
The current audit universe
What Internal Auditors Are Examining in 2026
Internal-audit plans change with the organization’s risk profile. The Internal Audit Foundation’s Risk in Focus 2026/2027 global summary draws on more than 3,000 responses worldwide and shows how strongly technology and external uncertainty now shape audit priorities.
Cybersecurity was selected by 80% of respondents as one of their five highest risks. Digital disruption, including artificial intelligence, reached 58%. Geopolitical and macroeconomic uncertainty reached 48%.
Those numbers do not mean every auditor spends most of the year on cyber or AI. They show why audit functions need technology knowledge, specialist support and a plan that can respond when risks move quickly.
Technology and judgment
Will AI Replace Internal Auditors?
AI will change internal-audit work. It can help teams examine larger datasets, locate unusual patterns, summarize material and automate repetitive testing. Used carefully, those tools give auditors more time for investigation, discussion and judgment.
The hard decisions remain. Auditors must determine whether source data is reliable, understand why a process works as it does, judge whether evidence is sufficient and explain a conclusion to people who may disagree. They also need to assess the risks created by AI itself: governance, model behavior, data quality, access, privacy, third parties, bias and human oversight.
AI is therefore both a tool used by auditors and a subject they audit. The profession’s need for curiosity, skepticism, independence and clear communication remains.
Career progression
How Internal-Audit Responsibilities Change with Seniority
| Career level | Typical responsibility | How the work changes |
|---|---|---|
| Staff or junior auditor | Walkthroughs, testing, data preparation and workpaper documentation | Builds process knowledge and learns how evidence supports a conclusion. |
| Senior internal auditor | Scopes sections of an engagement, performs complex testing, develops findings and coaches staff | Exercises more judgment and manages day-to-day stakeholder discussions. |
| Audit manager | Leads engagements, reviews work, manages resources and communicates significant issues | Balances technical quality, people, deadlines and management relationships. |
| Director or chief audit executive | Owns the audit strategy, risk-based plan, resources, quality and board communication | Works across the audit universe and protects the function’s independence and credibility. |
Titles vary. A smaller organization may give one person responsibilities spread across several levels, while a large global function may have dedicated specialists in technology, data, investigations, model risk or quality assurance.
What the work demands
What Skills Does a Good Internal Auditor Need?
The IIA’s current Internal Auditing Competency Framework connects knowledge and skill expectations to different professional levels. Technical knowledge matters, but audit quality also depends on how the auditor listens, reasons and communicates.
Risk and control thinking
Connect objectives, threats, controls and evidence without turning the audit into a checklist.
Professional skepticism
Test explanations fairly and keep asking when the evidence does not fit the story.
Interviewing and listening
Ask precise questions, understand how work happens and create enough trust for honest answers.
Data and technology
Use analysis intelligently and understand the systems producing the evidence.
Writing
Turn technical detail into a concise conclusion that states the issue, risk and required decision.
Judgment
Distinguish an isolated error from a pattern, a minor exception from a significant exposure and a weak explanation from a weak control.
Stakeholder management
Challenge people professionally, handle disagreement and preserve working relationships.
Integrity and courage
Protect confidential information, remain objective and raise difficult matters when the evidence supports them.
Adjacent professions
Internal Auditor vs External Auditor, Compliance and Risk
| Function | Primary purpose | Typical scope | Role in managing risk |
|---|---|---|---|
| Internal audit | Independent assurance and advice on governance, risk and controls | Enterprise-wide and risk-based | Evaluates and reports. It does not own the risk response. |
| External audit | Independent opinion or assurance for an external reporting purpose | Defined by the engagement, often financial statements or another subject matter | Reports against specified criteria and maintains independence from management. |
| Compliance | Help the organization understand and meet obligations | Laws, regulations, policy and conduct within its mandate | Usually supports or monitors management’s compliance framework. |
| Risk management | Coordinate how risks are identified, assessed and reported | Enterprise or specialist risk categories | Usually a second-line function that supports and challenges management. |
Some organizations combine responsibilities, especially in small teams. When roles overlap, safeguards are needed so internal audit can still provide objective assurance on work it did not design or operate.
Job title and credential
Do You Need CIA Certification to Work in Internal Audit?
No. Employers can hire internal auditors who have not yet earned the CIA designation. Entry routes vary, and professionals often move into internal audit from accounting, external audit, operations, technology, engineering, compliance or risk.
The credential can still matter. It signals tested knowledge of internal-audit fundamentals, engagement work and management of the internal-audit function. It can also give professionals a shared language for standards, evidence, governance and audit judgment.
If the credential fits your target role, use the current guide on how to become a Certified Internal Auditor. The separate CIA requirements guide explains current education and experience routes.
Career fit
Is Internal Audit a Good Career for You?
Internal audit suits people who want to understand how organizations make decisions and how those decisions can fail. The work exposes you to different departments, technologies and levels of management. It can lead toward audit management, a chief audit executive role or adjacent work in risk, compliance, controls, investigations and technology assurance.
You may enjoy internal audit if you like:
- Understanding a full process from beginning to end
- Asking clear questions without creating unnecessary conflict
- Comparing explanations with evidence
- Identifying the risk behind a control weakness
- Writing precise conclusions
- Learning about different functions and industries
- Balancing independence with constructive relationships
- Working through problems with no perfect answer
The role can feel demanding if you dislike documentation, interviews, ambiguity or challenging senior stakeholders. Strong auditors learn to handle those parts directly. They do not hide behind a checklist.
Compensation depends heavily on country, sector, specialization and seniority. For a focused market view, see the current CIA salary and career outlook in the United States.
Practitioner perspective
What Experienced CIA Faculty See in the Role
“A good internal auditor listens for the point where the process described in the procedure and the process used by the team start to separate. That gap may be harmless, or it may expose a risk the control was meant to manage. Evidence decides.”
Tanvi P., CIA, CFE, CISA, CAMS
“The strongest finding is not the longest one. It explains what happened, the criterion that should apply, why the condition arose and what exposure follows. Management can then make a clear decision about the response.”
Shyam Sarrof, CPA (USA), CMA (USA), senior CIA faculty
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Direct answers
Certified Internal Auditor Role: FAQs
What does a Certified Internal Auditor do?
A Certified Internal Auditor evaluates governance, risk and controls. The work includes planning audits, interviewing process owners, reviewing documents and data, testing controls, developing findings, communicating results and monitoring management’s action plans.
What does an internal auditor do every day?
Daily work can include process interviews, walkthroughs, data analysis, control testing, workpaper documentation, finding development, meetings with management and follow-up on earlier issues. The mix changes with the engagement stage and the auditor’s seniority.
What do internal auditors look for?
They look for evidence that important risks are understood and that controls are appropriately designed and operating. They also examine accountability, information quality, compliance, asset protection, efficiency and whether earlier issues were addressed.
Is internal audit only about financial records?
No. Internal audit can cover operations, technology, cybersecurity, compliance, governance, fraud risk, projects, data, third parties, culture and financial controls. The audit plan should follow the organization’s risk profile.
What is the difference between an internal auditor and a Certified Internal Auditor?
Internal auditor is a professional role. Certified Internal Auditor is a credential issued by The IIA. Someone may work in internal audit before earning the CIA designation.
Do internal auditors investigate fraud?
They may assess fraud risk, test anti-fraud controls and support or perform investigations within their mandate and competence. Formal investigations can also involve specialist investigators, legal counsel, HR, compliance or forensic teams.
What is the difference between internal and external audit?
Internal audit provides risk-based assurance and advice across the organization for the board and management. External audit provides independent assurance for a defined external reporting purpose, often related to financial statements or another specified subject matter.
How is internal audit different from compliance?
Compliance helps the organization understand, implement and monitor obligations within its mandate. Internal audit independently evaluates whether governance, risk management and controls, including compliance controls, are working as intended.
How is internal audit different from risk management?
Risk management helps coordinate how risks are identified, assessed and reported. Internal audit independently assesses whether the risk-management framework and related controls are effective.
What skills does an internal auditor need?
Important skills include risk assessment, control evaluation, evidence analysis, interviewing, data literacy, professional skepticism, writing, judgment, stakeholder management, integrity and clear communication.
Is internal audit a good career?
It can be a strong career for people who enjoy understanding processes, working with evidence, asking difficult questions and learning across an organization. Career paths can lead toward audit leadership or adjacent roles in risk, compliance, controls, investigations and technology assurance.
Can an internal auditor become a CFO?
Yes, some internal auditors move into finance leadership, especially when they build strong accounting, commercial, operational and people-management experience. Internal audit is not a guaranteed CFO route, and broader finance responsibility is normally required.
Will AI replace internal auditors?
AI can automate testing and help analyze data, but auditors still need to judge evidence, understand context, challenge assumptions, communicate with stakeholders and remain accountable for conclusions. AI also creates new governance, data and control risks that internal audit must assess.
Do you need to be an accountant to become an internal auditor?
No. Internal auditors also come from technology, engineering, operations, law, compliance, risk, investigations and other fields. The required knowledge depends on the role and the organization’s audit universe.
Author and technical review
Written and Reviewed by Experienced CIA Faculty
Tanvi P.
CIA, CFE, CISA, CAMS
Former Regional Financial Crime Risk, Standard Chartered · Former Vice President, Citi Global Investigations Unit · Former KPMG Forensic Services Manager
Tanvi brings 20+ years of international experience across internal audit, investigations, risk, controls and regulatory compliance. She wrote this guide to show how audit work moves from a business objective and evidence to a conclusion that leaders can act on.
Shyam Sarrof
CPA (USA), CMA (USA), ACA, ACMA, CS, CFA, ACTM, MBA, B.Com (H)
13+ Years in CIA Training | 22+ Years in Internal Audit, Risk & Controls
Shyam brings more than 22 years of experience across internal audit, accounting, controls, governance, risk and advisory. He reviewed the engagement sequence, professional boundaries, career levels and audit terminology in this guide.
Primary references
Sources Used for This Guide
- The IIA: What is internal auditing?
- The IIA: Global Internal Audit Standards
- The IIA: Internal Auditing Competency Framework
- The IIA: Statements of Position, including the Three Lines Model
- Internal Audit Foundation: Risk in Focus 2026/2027 Global Summary
Credential note: CIA is issued by The Institute of Internal Auditors. EduDelphi provides exam preparation and learner support and does not issue the credential. Professional requirements can change, so confirm current rules with The IIA or the applicable National Institute.
