Maheli,

What I know about PF I would let you know.

1 It is non mandatory upto the strength of 19 employees. As the company hires the 20th employee- its mandatory as per the gov rules

2 Now if the employees do not want to have that then it's their prerogative and in that case the employer should take the consent of the employees and records must be preserved as a proof

3 It works with 12 % employees share and 12 % employers share but specially in IT where they talk of CTC entire 24 %is borne by the employee.

4 Once started with PF the employee cannot stop this in between unless he leave the job.

As after as my knowledge goes...

Cordially,
Kisha