(i) Payment of interest by a firm to a bank- It
is included in national income because it is assumed that loans received by the firm will be used for a production activity which will increase the income of
the firm.
(ii) Payment of interest by a bank to an individual- Interest paid by
banks on deposits by individuals is included in national income
because banks are expected to have used individual, saving for productive
purpose.
(iii) Payment of interest by an individual to the bank-
Individual borrows to
meet his consumption expenditure. Such borrowings are not used
for production. Therefore, it is not a factor payment. lt is like a transfer
payment, and so it is not included in national income.