Quick Definition
Par value is the stated value of a security, primarily stocks and bonds, as determined by the issuer. For stocks, it is often a very small amount, like $0.01 or $1, and has little practical significance in modern finance. The term is more relevant when discussing bonds.
In the context of bonds, par value represents the amount the issuer promises to repay the bondholder at maturity. It is the principal amount on which interest payments are calculated. Investors often use par value as a benchmark to assess whether a bond is trading at a premium (above par), at a discount (below par), or at par.
The importance of par value has diminished over time, particularly for common stock. Many companies issue stock with no par value at all, allowing them greater flexibility in setting the initial offering price. This eliminates potential legal liabilities associated with selling stock below par.
For bonds, par value remains a crucial reference point. It determines the amount the bondholder will receive at maturity, assuming the issuer doesn't default. Coupon rates are expressed as a percentage of the par value, determining the periodic interest payments.
The concept of par value originated when securities were physically printed with a specific denomination. This made it easy to track ownership and calculate interest payments. While electronic trading has largely replaced physical certificates, the terminology persists.
Par value can also be relevant in accounting. When a company issues stock, the par value is recorded in the company's common stock account, while any amount received above par is recorded in the additional paid-in capital account. This distinction helps track the company's equity structure.
While par value might seem like a fixed and unchanging number, it can be affected by certain corporate actions. For example, a stock split can reduce the par value per share, while a reverse stock split can increase it. These actions are typically done to influence the stock's market price.
Despite its decreasing practical significance for stocks, understanding par value is still important for investors. It provides a historical context for the security's issuance and helps interpret financial statements. It remains a key concept in fixed-income investments.
Glossariz

Chinmoy Sarker
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Fun fact about Finance
Albert Einstein reportedly called compound interest the "eighth wonder of the world." It allows your money to grow exponentially over time by earning interest on both the principal and the previously earned interest.