What is an internal audit? Benefits, types and process

Published Tuesday 21 April 2026

Table of contents

• What is an internal audit?
• Internal audit vs external audit: Key differences
• Why are internal audits important for small businesses?
• Types of internal audits
• Components of internal audit
• Key areas of focus in internal audits for small businesses
• Internal audit independence and objectivity
• Key roles in an internal audit
• The internal audit process
• Tips for success when you implement internal audits
• FAQs on internal audits

Key takeaways

• Implement a structured internal audit process with four key phases: planning, fieldwork, reporting, and follow-up to turn what you discover about your business into real improvements.
• Focus your internal audits on four critical areas: financial accuracy, operational efficiency, fraud prevention, and risk management to protect your business and keep controls working effectively.
• Establish proper independence by having internal auditors report directly to an audit committee or board of directors rather than management, so findings are shared honestly and without pressure.
• Conduct internal audits at least once a year for most small businesses, and review high-risk areas quarterly or check key controls monthly if your business is growing quickly.

Key takeaways

• Implement a structured internal audit process with four key phases: planning, fieldwork execution, reporting, and follow-up actions.
• Focus internal audits on four critical business areas: financial accuracy, operational efficiency, fraud prevention, and risk management.
• Establish proper independence by having internal auditors report directly to an audit committee or board of directors, not just management.
• Conduct internal audits at least annually for most small businesses. Review high-risk areas quarterly and check key controls monthly for growing companies.

What is an internal audit?

An internal audit is a systematic review of your business's operations, finances, and controls conducted by your own team or hired consultants. The results stay inside your business to help you identify risks and make better decisions.

This differs from an external audit, where an independent firm examines your records for outside stakeholders like investors or regulators. Such firms must now implement a robust Quality Management system to ensure high standards.

For example, you might audit your risk management strategies to reduce vulnerabilities, or review whether you comply with your cyber insurance policy requirements.

Internal audit vs external audit: Key differences

Understanding the difference helps you decide which type of audit your business needs.

Internal audits have these characteristics:

• Who conducts it: Your own team or hired consultants
• Who uses the results: Management and board for internal decisions
• Primary focus: Operations, controls, and efficiency improvements
• Frequency: Flexible, based on your business needs
• Requirement: Usually voluntary for small businesses

External audits have these characteristics:

• Who conducts it: Independent, authorised audit firms
• Who uses the results: Investors, lenders, regulators, and other external stakeholders
• Primary focus: Financial statement accuracy and complying with regulations
• Frequency: Typically annual
• Requirement: Mandatory for publicly listed companies

For most small businesses, internal audits are optional but valuable. Larger listed entities that lack an internal audit function must explain the reason under corporate governance principles. External audits become necessary when you seek investment, apply for large loans, or reach certain revenue thresholds.

Why are internal audits important for small businesses?

Internal audits protect your business by catching problems before they become expensive to fix. For small businesses, they deliver three key benefits:

• Risk reduction: Spot vulnerabilities in your processes and controls before they cause damage
• Efficiency gains: Find bottlenecks and redundancies that waste time and money
• Stay compliant: Meet regulatory requirements and insurance policy conditions

Under the Corporations Act, listed entity chief executive officers (CEOs) and chief financial officers (CFOs) must declare that financial records give a true and fair view of performance. Internal audits help verify this claim.

Types of internal audits

The four main types of internal audits are operational, compliance, financial, and IT audits. Each focuses on a different area of your business:

• Operational audits: Evaluate internal processes to assess efficiency and resource use
• Audits to check you comply: Check your business follows laws, industry regulations, and internal policies
• Financial audits: Examine the accuracy of financial reports and related control systems
• IT audits: Assess cybersecurity, data protection, network access, and team training

Components of internal audit

The five components of internal audit are control environment, risk assessment, control activities, information and communication, and monitoring. This framework helps you see how all the pieces of your business work together to manage risk.

• Control environment: Sets the foundation through your business culture, ethical values, and management style
• Assess risk: Identify and analyse risks that could stop you from reaching your goals
• Control activities: Establish specific policies and procedures to manage risks, such as payment approvals or separating duties
• Information and how you communicate: Capture and share important information so everyone knows their role
• Monitoring: Check that your internal controls are working through regular reviews, spot checks, or ongoing ways to evaluate

Key areas of focus in internal audits for small businesses

Small businesses should focus internal audits on four key areas: financial accuracy, operational efficiency, fraud prevention, and risk management. These priorities help you examine how well your controls work and whether you're meeting requirements to comply.

• Financial accuracy: Review records, data entry processes, and access controls
• Operational efficiency: Analyse workflows to find redundancies and bottlenecks
• Prevent fraud: Assess controls for employee theft and external cyber threats
• Risk management: Evaluate how you identify, monitor, and respond to business risks

Internal audit independence and objectivity

Internal audits can be independent because auditors report to the board or audit committee rather than to management. For example, in highly regulated institutions, the board audit committee must consist entirely of non-executive directors. This reporting structure allows them to share findings without pressure or influence.

Australian Securities Exchange (ASX) recommendations state that audit committees for listed entities should have a majority of independent directors. This helps ensure impartiality.

Being objective is also a professional mindset. Internal auditors base their findings on evidence and aim to provide a clear, honest view of operations rather than assign blame.

Key roles in an internal audit

Three key roles drive internal audit success: the internal auditor, the audit committee, and management. Each has distinct responsibilities:

• Internal auditor: Leads the audit process, stays objective, and evaluates findings
• Audit committee: Sets audit priorities, approves plans, and reviews results (entities included in the S&P All Ordinaries Index are required to maintain an audit committee for the entire financial year)
• Management: Provides resources and implements recommended improvements

Publicly traded companies or large corporations may have a chief audit executive who reports to the audit committee and the CEO. In smaller companies, a variety of people may play different roles. For example, a bookkeeper might audit financial reports, while a team manager might audit workflows.

The internal audit process

The internal audit process has four phases: planning, fieldwork, reporting, and follow-up. Each phase helps you turn what you learn about your business into practical improvements.

1. Plan your internal audit

When you plan your audit, you identify what to examine and how to examine it effectively. Start by assessing risk to identify your biggest vulnerabilities, then design your audit scope to address these priority risks.

Your concerns determine your focus:

• Fraud concerns: Audit financial statements and money handling processes
• Efficiency concerns: Audit your workflows and operational processes

2. Complete the fieldwork

During fieldwork, you gather evidence to assess your controls and processes. Common activities include:

• Document review: Examine policies, procedures, and records
• Process analysis: Map workflows and identify inefficiencies
• Staff interviews: Understand how work actually gets done
• Observe directly: Watch processes in action to spot gaps

You may also need to test controls directly. For example, sending fake phishing emails can reveal which employees need more IT security training.

3. Write your audit report

The audit findings report documents what you discovered and recommends how to improve. Share it with your audit committee, owners, or managers so they can act on the findings.

4. Follow up on actions

Following up ensures your audit leads to real change. Review whether changes are working, then adjust as needed.

Tips for success when you implement internal audits

Successfully implementing internal audits requires planning and commitment. Start small by focusing on your highest-risk areas first. Build internal support by explaining how audits benefit everyone, not just management.

Document your audit processes clearly so they can be repeated consistently. Train your team on what to expect during audits to reduce anxiety and resistance.

Review and update your audit approach regularly to keep pace with your business growth and changing risks.

FAQs on internal audits

Here are answers to common questions about internal audits for small businesses.

How often should small businesses conduct internal audits?

Most small businesses should conduct internal audits at least annually. You may need more frequent audits for high-risk areas or if you're experiencing rapid growth.

Do internal audits require special certifications?

Internal auditors don't need special certifications, though qualifications like Certified Internal Auditor (CIA) add credibility. Many small businesses successfully conduct internal audits using knowledgeable team members or consultants.

Can internal audits replace external audits?

No, internal audits can't replace external audits when external audits are legally required. They serve different purposes and audiences. Internal audits help you improve operations, while external audits verify financial statements for outside stakeholders.

What should I do if an internal audit reveals problems?

Address audit findings promptly by creating an action plan with specific deadlines and responsibilities. Prioritise the most serious issues first. Follow up to ensure corrective actions are implemented and effective.