Self-assessment tax or advance tax??

Hello Friends

                         Happy Financial Year to all.

                       Now,my query is -  one of client has retired from govt.sevice in Dec.2012.He started receiving Provisional

pension for the same from dec.2012 ,but no tds was deducted from this pensions..so, my client was asked from their employer to pay the remaining tax theron for Dec.2012 till Feb.2013.

   Also, He has recived intrest on term deposit after Tds, the same income was not considered by the employer for Form 16.

So, now my query is whether my client have to pay advance tax  & interest theron or just pay remaining tax payable as self-assessment tax without any interest..one more point- because of inclusion of his income from intrest on term deposit, his tax liability has increased  by Rs. 10,000as compared to when ,only salary income was considered in form 16.so, on which amount of tax, interest is payable--tax payable on salary( on which no tds was deducted) or the whole tax liability arrived at after considering interest income from fixed deposits.

Please, help.