The rules related to investment in Post Office Monthly Income Scheme (MIS), Senior Citizen Savings Scheme (SCSS) or Post Office Term Deposit are also going to change. The interest amount in these schemes will not be available in cash from April 1. For this you have to open a savings account. Apart from this, customers who have not linked their post office savings account or bank account with these schemes and in such cases interest is not being paid. So they will need to link it.