An internal auditor is a business professional that is employed by companies to provide both independent and objective evaluations of financial and operational business activities. The main duty of these people are to find and solve problems within the business environment before they are detected by an external audit of the Securities and Exchange Commission or another governing body. To achieve this these people examine financial statements, expense reports, inventory, and etc. They also make risk assessments for the different departments within a business. When an internal auditor has gone through everything they have been asked to examine they present their findings in a formal report.
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This source is from the United States Department of Labor, an official US department which provides statistics and information about a variety of jobs. This source explains how it acquired its data, is frequently cited by other sources, and, as of 2019, has been updated less than a year ago.