30 March 2012
Your question does not specify whether he has defaulted in payment or not? if he has not paid the TDS on due date then he will have to pay interest @ 1.5% PER MONTH or part of the month from the date of dedution till the date of payment of tax.
30 March 2012
If the amount of TDS falls short of the total tax liability and the assessee has not paid advance tax, then interest u/s 234A and 234B shall be levied.