The Budget announced the Rent deduction Rs. 5000 / p.m form 1st April 2017. It's come into force on FY 17-18... In previous you can claim Rs. 24000 u/s 80GG ...
When you prepare you profit and loss.. There is head sale and other income... Interest on savings account come under other income... In itr 3 you have to show total income.. Then waht is need to show interest income in addition