while making TDS payment through bank (not through e-payment) for the month of Oct 2007, we have wrongly mentioned the assessment year as 2007-08 instead of 2008-09. Now we got a notice from the IT Dept. They considered this payment for the A.Y. 2007-08, demanded to pay interest for 6 months delayed payment (considering last date for that A.Y. as 31.05.08, interest demanded from June 2008 to Nov 2008). Now my question is how to reply to the A.O. Can I simply write a letter saying that A.Y. was wrongly mentioned in the challan, will the Dept. accept? or any other formalities to be done?