As per Income Tax of India guidelines, every Bank has to deduct TDS on Interest Income of clients Bank Deposits if the interest payout is Rs.10000/- and above per annum. To avoid TDS on your interest amount on Fixed Deposits, you have to give duly filled and signed form 15G, in case you are below 65 years old or 15H, if you are above 65 years old. 15G and 15H form is a declaration by the client that his total Income including Salary, Bank Deposit Interest, House property, Business and other Income for the Financial Year will not exceed Taxable income threshold and his tax liability for the Financial Year will be Nil. If these forms are not provided to Banks, TDS will be deducted as per the prescribed rate.
In your case, if your total Income for the year from Salaries, Hose Property, Business income, Bank interest or any other sources does not exceeds taxable Income threshold and your income tax liability is nil, then you need not worry about your Deposits in a single Bank. Only thing is to produce 15G or 15H to your bank. If already deducted earlier, you demand TDS certificate from your Bank and you can claim the same to Income Tax Department by filling return for refund of TDS amount.