Reply to intimation u/s 143(1)

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kalpesh (Querist)
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11 February 2012 hi i have recived an intimation during sep-10 for A.Y 2009-10 but i havent take any step & departmetn has issued another letter regarding confirmation they have demanded tax.actually in the return of ay 2009-10 i have setoff certain b/f loss of ay 03-04,04-05,05-06,07-08, & they have disaalowed the loss of ay 03-04 & 04-05 .during the assement of ay 05-06 they have setoff some loss out of b/f loss of 04-05 & 03-04 now i want to ractify my return u/s 154 by paying balance tax can i do it . they have given 7 days for ractification from the date of receipt can i ractify it & pay the tax.pls answer me soon