For 234 B: Rs.28270-15000=13270*5% (1% for every month from April to August) =Rs.664
For 234 C:
Sep: 8481(30% of 28270-0)*7% (sep-march)=594
Dec: 3481(30% of28270-5000)*4%(dec-march)=139
Mar: 1308(40% of28270-10000)*1%=13
Im made a mistake in calculating 234C in the prev message. Hope this is clear.
Your calculation of interest under 234B is very clear and thanks for the same. I infer that 30% of tax payable needs to be deposited before end-Sept, 60% ie another 30% before end-Dec, and full 100% before end-March. Pls confirm if I am right. Assuming I am right, I fail to understand the logic of paying 1 month's interest for any shortfall in March, as interest for any any such shortfall gets charged under 234C anyway. Are we getting charged doubly for March??