Fixed income refers to any type of investment under which the borrower/issuer is obliged to make payments of a fixed amount on a fixed schedule: for example, if the borrower has to pay interest at a fixed rate once a year, and to repay the principal amount on maturity.
Fixed-income securities can be contrasted with equity securities, often referred to as stocks and shares, that create no obligation to pay dividends or any other form of income. In order for a company to grow its business, it often must raise money: to finance an acquisition, buy equipment or land or invest in new product development. The terms on which investors will finance the company will depend on the risk profile of the company. The company can give up equity by issuing stock, or can promise to pay regular interest and repay the principal on the loan (bond, bank loan, or preferred stock).
The term "fixed" in "fixed income" refers to both the schedule of obligatory payments and the amount. "Fixed income securities" can be distinguished from inflation-indexed bonds, variable-interest rate notes, and the like. If an issuer misses a payment on a fixed income security, the issuer is in default, and depending on the relevant law and the structure of the security, the payees may be able to force the issuer into bankruptcy. In contrast, if a company misses a quarterly dividend to stock (non-fixed-income) shareholders, there is no violation of any payment covenant, and no default.
The term fixed income is also applied to a person's income that does not vary materially over time. This can include income derived from fixed-income investments such as bonds and preferred stocks or pensions that guarantee a fixed income. When pensioners or retirees are dependent on their pension as their dominant source of income, the term "fixed income" can also carry the implication that they have relatively limited discretionary income or have little financial freedom to make large or discretionary expenditures.
Governments issue government bonds in their own currency and sovereign bonds in foreign currencies. Local governments issue municipal bonds to finance themselves. Debt issued by government-backed agencies is called an agency bond. Companies can issue a corporate bond or obtain money from a bank through a corporate loan. Preferred stocks share some of the characteristics of fixed interest bonds. Securitized bank lending (e.g. credit card debt, car loans or mortgages) can be structured into other types of fixed income products such as ABS – asset-backed securities which can be traded on exchanges just like corporate and government bonds.