Fixed-income security

Fixed-income security is a financial instrument that provides investors with a contractual claim to receive predetermined or formula-based payments of interest, principal, or both over a specified period. Unlike stocks, which represent ownership interests in a company, fixed-income securities represent debt obligations issued by governments, corporations, financial institutions, municipalities, or supranational organizations to raise capital. Investors purchase these securities in exchange for periodic income payments and the repayment of principal at maturity or according to agreed contractual terms. Fixed-income securities constitute one of the principal asset classes in global financial markets and are widely used for income generation, capital preservation, portfolio diversification, and risk management.

History

The origins of fixed-income securities can be traced to the development of public borrowing by governments in ancient and medieval societies. Organized debt markets emerged during the Renaissance, particularly in Italian city-states such as Venice and Florence, where governments issued debt obligations to finance public expenditures.

During the seventeenth and eighteenth centuries, the growth of national governments and international trade contributed to the expansion of government bond markets. The establishment of institutions such as the Bank of England facilitated the issuance and trading of sovereign debt.

The nineteenth and twentieth centuries witnessed substantial growth in corporate debt markets as industrialization increased demand for long-term financing. Today, fixed-income securities are issued by a wide range of public and private entities and are traded in domestic and international capital markets.

Characteristics

Fixed-income securities generally possess several common characteristics.

Characteristic	Description
Issuer	Entity that borrows funds
Principal (Face value)	Amount to be repaid to investors
Coupon rate	Interest rate payable on the principal
Maturity date	Date on which principal becomes due
Interest payments	Periodic payments made to investors
Yield	Return earned based on market price
Credit quality	Assessment of the issuer's ability to repay obligations

Although many fixed-income securities pay fixed interest, some provide variable or inflation-linked payments.

Types

Fixed-income securities encompass a broad range of debt instruments.

Major categories include:

These instruments differ in terms of issuer, maturity, credit quality, payment structure, and risk characteristics.

Issuers

Fixed-income securities may be issued by a variety of entities.

Common issuers include:

national governments;
subnational governments;
municipalities;
corporations;
banks and financial institutions;
government agencies;
supranational organizations.

The creditworthiness of the issuer is a significant factor influencing the pricing and yield of the security.

Pricing

The market price of a fixed-income security is influenced by numerous factors.

These include:

prevailing interest rates;
credit quality;
remaining maturity;
inflation expectations;
market liquidity;
supply and demand;
macroeconomic conditions.

In general, prices of fixed-income securities move inversely to market interest rates.

Yield

Several measures are used to evaluate the return on fixed-income securities.

Common yield measures include:

coupon yield;
current yield;
yield to maturity;
yield to call;
yield to worst.

Yield to maturity is among the most widely used measures because it estimates the annualized return if the security is held until maturity and all contractual payments are received.

Risks

Investment in fixed-income securities involves several forms of risk.

Major risks include:

interest rate risk;
credit risk;
default risk;
inflation risk;
reinvestment risk;
liquidity risk;
currency risk;
call risk.

The relative importance of these risks varies according to the characteristics of the issuer and the security.

Credit ratings

Many fixed-income securities are evaluated by independent credit rating agencies.

Major international agencies include:

Credit ratings provide an assessment of the issuer's capacity to meet its financial obligations and are widely used by investors when evaluating investment risk.

Applications

Fixed-income securities are widely used throughout global financial markets.

Major applications include:

government financing;
corporate financing;
infrastructure financing;
portfolio diversification;
retirement investing;
income generation;
capital preservation;
monetary policy implementation;
liquidity management.

They are commonly held by pension funds, insurance companies, sovereign wealth funds, mutual funds, central banks, and individual investors.

Relationship with other financial instruments

Fixed-income securities differ from several other investment instruments.

Instrument	Represents	Typical return	Ownership
Fixed-income security	Debt obligation	Interest income and principal repayment	Creditor
Stock	Equity ownership	Dividends and capital appreciation	Shareholder
Mutual fund	Investment fund units	Depends on underlying assets	Unit holder
Exchange-traded fund	Investment fund shares	Depends on underlying assets	Shareholder

Unlike equity securities, fixed-income securities generally provide contractual payment obligations, although repayment remains subject to the issuer's financial capacity.

Impact

Fixed-income securities constitute one of the largest segments of global financial markets and play a central role in capital formation, government finance, corporate borrowing, and monetary policy implementation. They provide issuers with access to long-term funding while offering investors opportunities for relatively stable income, portfolio diversification, and risk management. The widespread use of fixed-income securities has also contributed to the development of bond markets, collective investment schemes, pension systems, and global capital markets.