We have to initially open the Open the PPF account for 15 years and after the initial period of 15 years is over, one can keep on extending the deposit for a period of 5 years at a time. In fact, this is where the magic of PPF begins. One need not start a fresh PPF account and continue it for all of 15 years — just extend the old one for five years at a time, indefinitely. This way, the same PPF account offers additional liquidity to what is offered during the initial term. Overall, then, after the initial 15-year period, you can convert your PPF investment into a 5-year deposit that offers tax-free interest, tax saving under Sec. 80C and immense liquidity —- and all this for your lifetime. Now, let’s briefly examine the rules of extension. The PPF account can be continued (after the term of 15 years) either with or without further subscription. The rules for contribution to the extended account remain the same as during the 15-year period. Once the choice is made for a block of five years, it cannot be changed.The only thing that investors should be careful of is that once an account is continued without contribution for any year, the subscriber cannot change over to with-contributions extension. [Notification F.3(6)-PD/86 dt 20.8.1986]. The choice to extend the PPF account with subscription has to be made within one year from the maturity of the account. If this is not done, then by default the account is deemed to have been extended without further contribution for a period of five years.