Both internal and external audits are completed with a high degree of independence, diligence and ethics. Both seek to provide an independent opinion about a company’s finances or practices. However, they differ significantly when it comes to who performs the audit, its overall purpose, and its scope.
Here is a brief snapshot of these differences:
Scope
Internal audit standards usually focus on a specific area of a company, while external audits look at all relevant financial information and any other practices that could confirm the veracity of financial statements and disclosures. In some circumstances, an external audit might be scoped to provide an opinion on a specific line item or financial schedule.
Purpose
Internal audits focus on measuring current performance or compliance with particular policies or procedures and finding areas for improvement. An internal audit is primarily focused on helping an organisation improve and helping to achieve your business objectives while managing risk. An internal business audit is beneficial to evaluate and improve the effectiveness of risk management, control and governance processes. You can read more about the “flavours” of internal audit here.
External audits, on the other hand, focus on verifying the accuracy and veracity of financial statements, thus providing reliable information about the results of a company’s operations, its financial position, and its cash flows. You can read more about external audits here.
Auditor
External auditors are from a third party (i.e. independent firm) while internal auditors can either be internally appointed and work on behalf of a company, or an external firm, and report independently to the audit committee or Board.