When an individual owns shares of stock in a company, the company may decide to pay quarterly dividends to stockholders. These dividends are taxable because they are classified as income for the holder of the stocks. Both common and preferred stockholders are subject to taxes on any dividends paid through the year.
Interest income received by companies and individuals is fully taxable under U.S. tax laws. This is why an analysis of the amount of interest to charge on a loan must include an estimate of the taxes the creditor will expect to pay. Interest rates must, therefore, not only represent the amount of risk associated with lending money, it also must be able to cover any expenses including taxes due when interest income is received. Interestingly, for constitutional purposes and under most circumstances, interest income from state and local government is not taxable by the Federal Government. The tax-free nature of municipal bonds can be an attractive investment.