@Santanu,
The P.F. deduction is at 12% of Basic+D.A. Normally, the gross monthly salary consists of Basic+D.A.+HRA+Allowances. In your case, your gross monthly salary is Rs. 34,000/-. Hence, you need to check what your Basic salary is out of that. I am sure it will be Rs. 6,500/-. Therefore, the PF is deducted only on this Basic amount. The irony is, in earlier days, the Basic component was kept low so that the Employer contribution towards PF, ESIC, Gratuity, etc., was low. Now, it's the other way round. It is kept above Rs. 15,000/- to avoid the ESIC & PF regulations.
@Jayashree,
Your clarification is ambiguous. For the last many years, my Basic salary has been much more than Rs. 20,000/-, and all my past employers have deducted on that amount at the appropriate rate (earlier 8.33% and now 12%). Hence, I do not think it may be voluntary for the organization to contribute the applicable rate only on Rs. 6,500/- irrespective of the Basic+DA. Please clarify.
Regards: