If any body wants to contribute PF on more than what is prescribed under PF Act, then he can do that, their is no compulsion.
The main thing is that the mandatory requirement under the specific Act should be met, if you are providing more than the ACT than there is no boundation, but once if you start doing that then you can't reverse back in the future.
The main thing is that the mandatory requirement under the specific Act should be met, if you are providing more than the ACT than there is no boundation, but once if you start doing that then you can't reverse back in the future.