Consider all this when an employee leaves your organization:
Costs of replacing the average employee is at least 21% of their annual salary due to direct costs (exit interviews, severance, unemployment tax, overtime or temporary staffing, recruitment, agency fees, employment testing, training and orientation). What is not counted are indirect costs (lost productivity due to short staff and reduced morale, costs incurred due to errors of new employee, lost clients, loss of historical/organizational knowledge)