A relieving letter is issued by the human resources department of a company to an employee that has resigned formally from his or her position. It is a formal acknowledgement from the company that the resignation was accepted.
A relieving letter is a business letter with a basic format, and it will specify certain details to the employee. In the letter, the HR department informs the employee that the company accepts the resignation and notes the final date of employment. Similarly, the HR department can ask the employee to get a clearance certificate from his or her department head. The clearance certificate is necessary so that the company's accounting department can issue final dues and employee payments.