You should receive a Provisional certificate from the bank/institution from where you have taken the loan. Attach the copy of that certificate while filing your returns. If your employer give an option to you where you can declare the amount well in advance to them, than do that immediately. This way you will start getting the benefit on a monthly basis. i.e your monthly take home will increase. You can avail upto Rs 150000 on interest component and upto Rs 100000 on principal component.
