I am confused about when is a person required to pay interest with self assessment tax. For example, some salaried person has tax due to salary:Rs18400 and tax due to interest in Fixed deposit and savings account, Rs7000. (Fixed deposit got matured in August, 2011). TDS was deducted for Rs18400 by employer and he wants to pay rest Rs7000 as self assessment tax in August 2012 (due date for efiling is now 31Aug, 2012). Can he do that with or without interest (234A,B,C)? Second, it appears that 30% of total tax (due to salary+interest income) had not been deposited by sept (as TDS, by employer), 2011, so will 234A be applicable? Anything else need to be considered? Please suggest. Thanks.