The full form of ESI is Employees State Insurance. Every employer or company having more than 10 employees with a maximum salary of Rs. 21000/- needs to apply for the ESI Registration within the 15 days of its applicability. In some of the states the employees limit is 20.
After getting the ESI Registration Online every employer has to contribute 3.25% of the total salary of his employees and the employee also have to pay the contribution of .75% towards the ESIC.