Your PPF account may have a lower balance for several reasons, including:
●    Only at the fiscal year’s end, on March 31st, is the interest computed.
●    A loan that you took out against your PPF balance can be deducted.
●    Quarterly adjustments are made to the interest rate.
●    If a payment is made just after the fifth day of the month, interest will only start to accrue the following month.