Including Notice Period Clauses
Normally, such clauses should be included in the appointment order/offer letter itself. In the absence of a notice period clause in the appointment order, the same can be introduced only by sending a circular/notice to all employees as prescribed under Section 9A of the Industrial Disputes Act.
Notice Period for Managers and Non-Managers
Regarding managers, you can implement this change without official communication by providing a letter to the concerned employee stating that henceforth their notice period will be one month/two months/three months. However, for employees without managerial powers, the notice period, like any change in service conditions, would require a common notice as per law.
Legal Requirements and Practical Considerations
It is important to note that, in order to terminate an employee, the employer is required to give notice. Nowhere in any Labour Act is it mentioned that an employee should give notice if they want to leave a company. Hence, the fourth schedule to the ID Act, which outlines changes in service conditions requiring notice, does not specify a notice period. However, in practice, the notice period has been recognized as one of the service conditions. Thus, it is advisable to adhere to it. Otherwise, you may need to have a Standing Order drafted and certified by the Labour Commissioner. If workers object to the notice issued under Section 9A of the ID Act, then you will have to abandon the matter.
The format as per the Industrial Disputes (Central) Rules is attached.