Section 80TTB of the Income Tax law gives provisions relating to tax benefits available on account of interest income from deposits with banks or post office or co-operative banks of an amount upto Rs. 50,000 earned by the senior citizen (i.e., an individual of the age of 60 years or above). Interest earned on saving deposits and fixed deposit, both shall be eligible for deduction under this provision.
Section 194A of the Income Tax law gives corresponding provisions that no tax shall be deducted at source from payment of interest by bank or post-office or co-operative bank to a senior citizen up to Rs. 50,000. Therefore limit is to be computed for every bank individually.
Source: Income Tax India’s Official Website