The following are your questions and my answers for them.
Question No. (1): No regular salary is paid during the said 12 weeks. Only Basic + DA is paid for 12 weeks, and no other allowance like TA, HRA, etc., is paid as applicable in the Government Sector.
Answer: The payment made during the maternity benefit period is not called salary or wage; it is called maternity benefit. The quantum of maternity benefit payable under the Maternity Benefit Act, to put it very simply without using legal language, is the pay last drawn at the time the woman starts to avail maternity benefit.
Question No. (2): Whether the payment, i.e., one day basic + DA x 12 weeks, comes under the Income Tax Act, i.e., tax to be deducted or not.
Answer: The payment is not "salary" or "wages." This much I can clarify. Whether it is taxable or not could be answered only by a tax expert.
Question No. (3): Whether PF is deductible from Basic + DA or not.
Answer: Again, as the payment is only "maternity benefit" and not "salary" or "wage," an expert in PF laws will be able to give you a correct answer. However, my view is that PF deductions could be made based on Section 13 of the Maternity Benefit Act.
Regards,