• There are three main types of audit: external audit, internal audit and Internal Revenue Service (IRS) audit.

  • External audits are usually carried out by Certified Auditing Firms (CPAs) and result in an auditor’s opinion that is included in the audit report.
  • An unqualified or pure auditor’s report means that the auditor has not identified any material misstatement as a result of his examination of the financial statements.
  • An external audit may include an examination of both the financial statements and the company’s internal controls.
  • Internal audit serves as a management tool for process improvement and internal control.