If the payment has been done on 31-8-11 the the due date for paying TDs on the same would be 7-9-11. So in case the TDS has not been paid till this date then interest would be levied at 1% p.m. from Sep 11 till the month when the TDS has actually been paid to the Governement treasury. I hope this sufficces your requirements
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Can anyone quote a case law for payment of interest in this regard?