Check the contract with employee individually or union, if any.
A 30 to 90-day notice period applies in order to terminate ‘workmen’ (as defined in the Industrial Disputes Act, 1947) – that is, employees whose role is not primarily supervisory, administrative or managerial) for convenience, with 15 days’ pay due for every year worked. In the case of manufacturing units, plantations and mines with 100 or more workmen, termination for convenience requires prior government approval; in other sectors, it requires only government notification.
Termination for cause does not include non-performance – it includes only behavior which qualifies as misconduct.
The ‘last in, first out’ principle requires that the employer first terminate for convenience the last people to join the organisation in the same role. However, this requirement can be contracted out of. When hiring for the same role, workmen who were terminated for convenience should be given the opportunity to re-join the company.
State laws generally provide for about 15 days of earned/regular leave a year. Employees also benefit from up to 10 days of sick leave and a possible 10 additional days of ‘casual leave’.
For more refer: INDUSTRIALEMPLOYMENT(STANDINGORDERS)
&/or employment-and-labour-laws-and-regulations