Interest is at the rate of .75% per month from the date at which TDS was deducted to the actual date of deposit. since you have deducted tax at 31st march so i think for one day it will not be calculated as whole month meaning if tax is deducted on 13th march then interest need to be deposit for 3 months since it is last day according to me it will not be deemed as whole month and interest need to be deposit for 2 months i.e. april and may.
What is the meaning of part of the month, even one day it counts so three months. what is the error type whether tds deducted and not deposited or tds not deducted at all. there are different rated for different errors.
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