Employee turnover is a ratio comparison of the number of employees a company must replace in a given time period to the average number of total employees. A huge concern to most companies, employee turnover is a costly expense especially in lower paying job roles, for which the employee turnover rate is highest. Many factors play a role in the employee turnover rate of any company, and these can stem from both the employer and the employees. Wages, company benefits, employee attendance, and job performance are all factors that play a significant role in employee turnover. Companies take a deep interest in their employee turnover rate because it is a costly part of doing business.