The correspondence of the Post Office Savings Bank and its organs with
the depositors is post free.
The revenue of the Post Office Savings Bank is exempt from duty.
In the business of the Post Office Savings Bank all legal documents
passing between the Bank, the authorities or the organs of the Bank and
the depositors, their legal heirs or authorised agents, are free from
stamp duty and taxes. In like manner the interest of savings-deposits
is exempt from the Income-tax and from any tax which may replace it in
time to come.