Dear HR CLAL,
Some additional comments on the issue following Mr.V.M.L's reply. You have mentioned about CTC summing up to Rs.20000-00 p.m. But CTC is an all inclusive cost of employment which comprises of the components falling under the definitions of the term wage under both the ESI Act,1948 and the EPF Act,1952 and the excluded ones too.
Therefore, threshold wage under the ESI Act, being above the CTC, neither the employee nor the employer has any choice in the enrollment.
Regarding enrollment into EPF, the wage threshold is Rs.15000-00 pm only. Out of the CTC of Rs.20000/=pm, if the components constituting wages is Rs.15000/= or below, then also there is no choice to be outside the EPF. Moreover, if he is already a member of the EPF, then also he has to continue of course limiting the contribution to the threshold amount of wages.