Instead of re-issuing the appointment letter with a revised salary, what you can do is send them an increment letter.
Increment Letter Format
Find below the format for your perusal:
Date
Dear [Name],
Sub: Increment Letter
We are happy to inform you that based on your sustained performance over the tenure of your service since [Date of Joining] and on receiving satisfactory reports from your superiors, we wish to revise your compensation as described below.
- Basic - Rs.
- DA - Rs.
- HRA - Rs.
- Conveyance - Rs.
- Medical - Rs.
(Please use your own format for compensation. I mentioned the above titles based on a generic breakdown.)
Please note that all the conditions of employment, however, would remain the same as per the order during your tenure of service with our organization.
We wish you all the very best in your career with our organization.
Regards,
Authorized sign
Importance of Written Applications for Employment Changes
Whenever any changes are made in the employment terms, it is always better to have a written application for it. If you are changing the services or roles of the person, a similar letter should be assigned to the concerned individual(s).
This kind of letter helps the company keep track of what is being communicated, who does what, and who is being compensated at what rate, etc. Above all, such letters are very essential to be filed properly and preserved in case of an audit. (Companies have to conduct HR auditing just like financial auditing.)
Note: Issuing Letters in Duplicate
Always issue such letters in two copies. One copy should be handed over to the employee. On the other copy, the employee's signature should be taken and it should be filed with other documents.
Hope it helped. :-)