Usually, the department in charge sends the salary slip to the employee through email or as a printed hardcopy every month. It acts as proof that you are currently working for a company organisation and will be able to clear the amount of the loan. A person can use his salary slip as proof to apply for a credit card, loans, job applications etc. It includes everything from their monthly total earnings, and total monthly deductions, to their income break-ups and a summary of net salary received during the month. Basically, a salary slip is a document that an employer provides to his employees every month. The employee can request a salary slip from the human resources department, finance department or administration department. An application for salary slip is a formal letter written by an employee to their employer requesting their monthly income salary slip.