11 May 2015
The query is not clear. . In case of salary, TDS payment is required to be made on the 7th of the next month when salary becomes due.
. If TDS has not been deposited in time interest @ 1.5% per month for delayed deposit is applicable. Here, the date of credit/payment which ever is earlier, will be considered as the date of payment. . You have to re-compute the TDS liability, by considering the increment in salary and accordingly deposit the TDS amount with interest.
11 May 2015
Deduct TDS in Feb itself as the increased salary of past months has become due only in the month of Feb. . Deduct TDS as if the amount is being paid towards Salary for the month of Feb. .