@Santanu,
The P.F. deduction is @12% of Basic+D.A. Normally the gross monthly salary constitutes of Basic+D.A.+HRA+Allowances. In your case, your gross monthly salary is Rs.34000/- Hence, you need to check what is your Basic salary out of that. I am sure, it will be Rs.6500/- Hence, the PF is deducted only on this Basic amount. Irony is, in the earlier days, the Basic component was kept low so that the Employer contribution towards PF, ESIC, Gratuity, etc. was low. Now, its the other way round. It is kept above Rs.15000/- to get away with the ESIC & PF regulations.
@ Jayashree,
Your clarification is ambiguous. For last many years, my Basic salary has been much more than Rs.20000/- and all my past employers have deducted on that amount at the appropriate rate (earlier 8.33 & now 12%). Hence, I do not think it may be voluntary on the organisation to contribute the applicable rate only on Rs.6500/- irrespective of the Basic+ DA. Please clarify.
Regards: