A Public Provident Fund (PPF) is a long-term investment instrument that is risk-free in nature. The maturity period of the account is 15 years and one cannot withdraw any amount until 7 years. PPF scheme is a good avenue for claiming tax deduction for up to INR 1.5 Lakhs under section 80C. Moreover, the interest earned from the savings is also tax-free. This instrument is ideal for retirement plans as you can get the entire amount after 15 years. 

You should invest minimum of INR 500 in a financial year to keep the account active. Twelve deposits can be made in a year for maximum of INR 1.5 Lakhs. You can open a PPF account at post offices, nationalised and public banks.