Ok if for a CNF ticket,it should cancelled more than 48 hrs before departure of train,then only cancellation charges shall be applicable.Refer to the rule for charges applicable for class & if its E-Ticket add Bank + IRCTC charges deduction.
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Rule : if the ticket is presented for cancellation more than forty eight hours instead of the existing 24 hours in advance of the scheduled departure of the train, a minimum per passenger cancellation charge shall be deducted at the flat rate of rupees one hundred and twenty for air-conditioned first class/executive...
more... class, rupees one hundred for air-conditioned-II tier/first class, rupees ninety for air-conditioned III-tier/ 3 economy/air-conditioned chair car, rupees sixty for sleeper class and rupees thirty for second class.