Hi, Basically, it is an internal communication within the organization from HR to top management. There is no standard format. You may refer to the following:
Sample Salary Approval Note
Dear Sir,
Please find below the details of the newly selected employee, Mr./Ms. ____, for the position of ____. Mr. _____, who is currently employed with _______ as _______ for a total salary of Rs. _____. Expectation is _____. He has a total ___ years of experience in ____. Mr. _____ selected him as ____ for a CTC of Rs. ____. He will be joining us with ___ notice. The payslip copy is attached herewith.
Source: ___
Submitted for your approval, Sir.