Everyone wants to invest a part of their income and invest the money in a safe and good place where it can earn good returns. In this scenario, all the schemes run by the Post Office are very popular and they offer good returns. One such scheme is the Public Provident Fund (PPF), which is the most popular among investors looking for low-risk tax-free investment returns. While it offers more than 7 percent interest on investment, a good fund is also accumulated through regular investments. 7.1% interest, 15-year lock-in period Under the Public Provident Fund (PPF), the government offers 7.1% annual tax-free interest to investors. In such a scenario, this government scheme proves to be a profitable deal for those in the higher tax bracket. Investing in PPF encourages disciplined savings with contributions that are tax deductible under Section 80C. It claims EEE (Exempt-Exempt-Exempt), which means the contribution you make to the scheme is tax-free, the interest earned on the investment is also tax-free, and the amount received at maturity is also tax-free. The lock-in period in this scheme is 15 years.