Internal audits are important because they give the board and senior leadership an independent, evidence-based view of whether the organization’s controls, compliance programs, and financial records actually work — a view management cannot credibly provide about its own operations. Without that outside check, leadership relies on self-assessment from the people responsible for the results, and problems tend to stay hidden until they become expensive.
Independence Is What Makes the Findings Worth Anything
An internal audit function only delivers value if it can report bad news without being punished for it. That’s why professional standards position internal audit as reporting functionally to the board’s audit committee, with a separate administrative line to executive management.1The Institute of Internal Auditors. The Audit Committee Internal Audit Oversight The audit committee meets periodically with the chief audit executive without management present, so sensitive issues can surface without being softened first.
The foundation of that independence is a written charter, approved by the board, that defines the audit function’s purpose, authority, and responsibilities. A strong charter grants auditors unrestricted access to records, personnel, and physical properties relevant to their work.2The Institute of Internal Auditors. The Internal Audit Charter – A Blueprint to Assurance Success Without that written authority, department heads can stonewall the review and the function becomes decorative. The Institute of Internal Auditors describes the function’s purpose as “providing the board and management with independent, risk-based, and objective assurance, advice, insight, and foresight.”3The Institute of Internal Auditors. Global Internal Audit Standards 2024
Catching Risks the People Doing the Work Can’t See
The people closest to a process usually can’t spot its weaknesses. Auditors come in from outside the workflow and map it end to end, which is often where the gaps show up. A procurement team might have solid vendor approval procedures but no controls around contract amendments. A sales-to-fulfillment-to-billing chain might quietly assume that credit verification happened at some earlier step, when in fact no one performed it.
Some of the highest-impact risks live in the handoffs between departments. Auditors document those transitions and flag the points where assumptions replace actual verification, then measure the distance between the current state and the level of control the organization needs.
Risk review also extends past the organization’s walls. Auditors evaluate whether business continuity and disaster recovery plans are current, whether recovery drills use realistic scenarios and involve the right stakeholders, and whether third-party vendors have continuity plans aligned with the organization’s requirements. A supply chain disruption at a critical vendor can be as damaging as an internal failure.
Keeping the Organization Out of Regulatory Trouble
Compliance is where the cost of skipping internal audit becomes concrete. Different regimes touch different organizations, but the pattern is consistent: penalties are large, and internal testing is what gives management time to fix problems before an outside regulator finds them.
Sarbanes-Oxley for Public Companies
Section 404(a) of Sarbanes-Oxley requires management to assess and report on the effectiveness of internal controls over financial reporting each year. Section 404(b) then requires the company’s independent auditor to attest to that assessment.4U.S. Securities and Exchange Commission. SEC Proposes Additional Disclosures, Prohibitions to Implement Sarbanes-Oxley Act Internal auditors test those controls throughout the year, catch weaknesses early, and give management room to remediate before the external auditor arrives.
The stakes for executives who certify false reports are severe. Under Section 906, an officer who knowingly certifies a report that doesn’t comply with the law faces up to $1 million in fines and 10 years in prison. If the certification is willful, the penalties jump to $5 million and 20 years.5Office of the Law Revision Counsel. 18 U.S. Code 1350 – Failure of Corporate Officers to Certify Financial Reports Internal audit’s testing is part of what gives an executive the confidence to sign — or the warning not to.
The Foreign Corrupt Practices Act
Companies operating internationally are covered by the Foreign Corrupt Practices Act, which prohibits bribing foreign officials to obtain or keep business and requires accurate books and records with adequate internal accounting controls.6U.S. Department of State. Appendix A – Foreign Corrupt Practices Act Antibribery Provisions Internal auditors review payment records, third-party agent contracts, and expense reports for red flags: unusually high commissions, payments routed through countries with high corruption indices, or vendors that lack the qualifications to deliver the services they’re supposedly providing.
Criminal fines for corporations can reach $2 million per violation, with individuals facing up to $100,000 and five years in prison. The Alternative Fines Act allows fines up to twice the benefit the company sought from the corrupt payment, and several of the largest settlements have exceeded $400 million. Catching a gap during an internal audit is drastically cheaper than defending a DOJ investigation.
Data Privacy Laws
Organizations handling sensitive personal information face overlapping regimes. The HIPAA Security Rule requires covered entities and their business associates to implement administrative, physical, and technical safeguards for electronic protected health information, including audit controls that record and examine activity in systems containing that data.7Department of Health and Human Services. Summary of the HIPAA Security Rule Auditors verify that encryption protocols, access logs, and authorization checks are functioning as required.
HIPAA civil penalties are inflation-adjusted annually. As of 2025, fines range from $145 per violation at the lowest tier up to $2,190,294 per violation for willful neglect that goes uncorrected, with an annual cap of $2,190,294 per violation category.8Federal Register. Annual Civil Monetary Penalties Inflation Adjustment Organizations also subject to the European Union’s General Data Protection Regulation face maximum fines of €20 million or 4% of global annual turnover, whichever is higher, for the most serious violations.9European Data Protection Board. Guidelines on the Calculation of Administrative Fines Under the GDPR A single data breach can trigger penalties under both frameworks simultaneously.
Anti-Money Laundering Programs
The Bank Secrecy Act requires financial institutions and money services businesses to establish anti-money laundering programs that include independent testing.10Financial Crimes Enforcement Network. Frequently Asked Questions Conducting Independent Reviews Internal auditors or qualified outside firms evaluate whether AML controls operate as intended, fulfill legal requirements, and mitigate risks like money laundering and terrorism financing. High-risk institutions typically undergo these reviews more often than annually. The independent testing requirement exists because the people running the compliance program day to day are too close to it to objectively evaluate whether it’s working.
Finding Fraud Before It Grows
Regular audit cycles create a perception of detection that discourages fraud in the first place. Auditors evaluate environments through the Fraud Triangle, looking for the intersection of financial pressure, opportunity, and rationalization. Consistent review of high-risk areas shrinks the window of opportunity for someone to manipulate records undetected.
Physical verification remains a core technique. Auditors perform surprise counts of cash on hand, reconcile warehouse inventory against purchase orders, and verify that high-value equipment listed on the books actually exists in the workspace. These steps reveal whether items are being diverted through unauthorized transactions or simple theft.
Data analytics has changed how quickly auditors can spot anomalies. Instead of testing a sample, analytics tools let auditors review the entire population of transactions across payroll, accounts payable, and procurement. Auditors can flag unusual number distributions in invoice amounts, payments to unknown vendors that start small and grow, and duplicate direct deposit account numbers or employee addresses in payroll records. Many organizations pair this monitoring with whistleblower hotlines that internal auditors help administer, creating overlapping detection layers that are harder to evade than either approach alone.
Checking That Policies on Paper Exist in Practice
Leadership sets policies for travel expenses, procurement limits, hiring practices, and dozens of other areas. Compliance erodes over time as people find shortcuts or departments develop informal workarounds. Auditors compare what’s written in handbooks and standard operating procedures against what’s actually happening.
When departments operate in silos, they tend to develop their own rules that conflict with broader corporate strategy. One division might approve vendor payments outside the standard procurement system because it’s faster. Another might skip required background checks for contractors because the hiring manager considers them unnecessary. Auditors identify these breakdowns before they compound into systemic failures.
Segregation of Duties
One of the most fundamental controls auditors test is segregation of duties: the principle that no single person should control consecutive steps in a financial process. If the same employee can initiate a purchase, approve it, record it, and reconcile it, nothing prevents that employee from stealing. Core functions where segregation matters include cash receipts, purchasing, payroll, and disbursements.11Office of Justice Programs. Internal Controls and Separation of Duties Guide Sheet
Auditors check whether the person approving timesheets is different from the person processing payroll, whether the employee receiving goods also handles the payment, and whether bank reconciliations are performed by someone with no authority to make deposits. Small organizations often struggle to separate every function because they don’t have the staff. In those cases, auditors recommend compensating controls such as management review of transaction reports or mandatory dual signatures above certain dollar thresholds.
Protecting the Accuracy of the Numbers
Reliable financial reporting depends on an audit trail that links every transaction to its source document. Internal auditors trace money from the original invoice through the general ledger to the balance sheet, verifying that reported cash and liabilities rest on factual evidence. Inaccurate records can create unexpected tax liabilities or expose the company to investor lawsuits when statements overstate its health.
Auditors test the accuracy of depreciation schedules and the valuation of intangible assets to prevent overstatement of company worth. They also examine journal entries for unusual characteristics: round-dollar amounts, entries posted near quarter-end, or entries made by people who don’t normally make them.
Financial accuracy doesn’t stop at the organization’s walls. Auditors evaluate risks embedded in vendor contracts and third-party relationships, including data processing agreements, service level agreements that set performance and uptime expectations, and liability and indemnification terms that clarify financial responsibility if a breach or service failure occurs. A vendor’s poor controls can directly compromise the organization’s data and financial integrity, so outsourced functions receive the same scrutiny as internal ones.
Covering Cybersecurity and AI Risk
Cybersecurity has moved from an IT concern to a board-level governance issue. The SEC’s 2023 cybersecurity disclosure rules require public companies to disclose their processes for assessing and managing material cybersecurity risks, describe management’s role, and explain how the board oversees cyber risk.12U.S. Securities and Exchange Commission. Cybersecurity Risk Management, Strategy, Governance, and Incident Disclosure Companies also must disclose material cybersecurity incidents promptly. Internal audit teams verify that the controls and processes described in those disclosures actually exist and function as stated.
As organizations adopt artificial intelligence, auditors face the added challenge of evaluating systems that even their developers may not fully understand. The NIST AI Risk Management Framework provides a structured approach organized around four functions: govern, map, measure, and manage.13National Institute of Standards and Technology. AI RMF Core Practical focus areas include whether AI governance policies exist and are enforced, whether the organization has inventoried its AI systems, whether bias and fairness evaluations are performed, and whether processes exist for safely decommissioning AI tools that no longer meet standards.
The Cost of Ignoring What Audits Find
An audit report is only as valuable as the response to it. When management agrees to corrective actions and then fails to implement them, the same weaknesses persist and the consequences compound. Research on companies that fail to fix previously disclosed material weaknesses in internal controls shows they experience higher audit fees, increased likelihood of auditor resignation, greater risk of receiving going-concern opinions, missed filing deadlines, and higher borrowing costs through poorer credit ratings and elevated interest rates.14American Accounting Association. The Failure to Remediate Previously Disclosed Material Weaknesses in Internal Controls
Effective audit functions track every recommendation through resolution. Professional standards require the chief audit executive to maintain a system that follows each recommendation and monitors whether management has addressed it or formally accepted the risk of not acting.3The Institute of Internal Auditors. Global Internal Audit Standards 2024 When a manager declines to act on a finding, the chief audit executive escalates so that someone with appropriate authority formally accepts the residual risk. The worst outcome isn’t an audit finding. It’s an audit finding that everyone knew about and nobody fixed.