For PPF, there is a lock-in period of 15 years and the money can be withdrawn in whole after its maturity period. However, pre-mature withdrawals can be made from the end of the sixth financial year from when the commenced. The maximum amount that can be withdrawn pre-maturely is equal to 50% of the amount that stood in the account at the end of 4th year preceding the year in which the amount is withdrawn or the end of the preceding year whichever is lower. You will have to ask your bank to mention the withdrawal amount of your PPF in the certificate they issue.