If you are staying in your father's flat,plz show a rent receipt to get exemption in HRA.You can get your entire HRA exempt but for that you will have to show a rent receipt of Rs 7500 per month.This will ensure that rent paid less 10 % of your salary (taken as Rs 12,500 pm here) is equal to your HRA.Also I assume that you are living in a metro,otherwise the max exemption available on HRA will be 40 % of your salary,that is Rs 5000 pm only.Besides,plz ensure that you invest such that you can claim deduction of rs 1 lac under sec 80C.This of course,will include your own PF contribution.You may invest in ELSS,PPF,NSC,repayment of home loan principal,etc.