Highlights Invest minimum Rs 500 per annum. Maximum limit of Rs 1.5 lakh per annum. New Delhi: The key to reaping a good return lies in starting saving from an early stage and carry it in a disciplined manner. One such investment avenue that assures guaranteed return is the Public Provident Fund (PPF) Scheme. PPF Scheme was introduced by the National Savings Organization in 1968 was aimed at making small savings a lucrative investment option. If you choose your tenure wisely, PPF in the long term will yield very good returns. If you invest even Rs 1,000 a month in Public Provident Fund , it will give you lakhs of rupees in return in the long term. Here is an assumptive calculation on how you can get over Rs 26 by investing a small amount of Rs 1000 per month in PPF.