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What is a sinking fund provision in bonds?

Understanding Sinking Fund Provision in Bonds


A sinking fund provision, in the realm of bond investing, is a safeguard to assure investors of their returns on investment. As a bond market beginner, understanding the nuanced concept of this provision is essential to estimating the overall safety levels of your investment and ability to generate returns. To provide a comprehensive understanding, let’s delve into the specifics and implications of a sinking fund provision.

Defining Sinking Fund Provision

A sinking fund provision is a specific clause embedded in certain types of bond contracts, primarily corporate bonds. This clause essentially obligates the issuing corporation to gradually retire a portion of the bonds issued before they reach their maturity date. This is accomplished by setting aside money over time, potentially each year, thus creating a “sinking fund.”

Bond Basics

Before we continue, let’s take a brief look at how bonds work. When you purchase a bond, you are essentially lending money to the issuing entity, which could be a government or a corporation, for a specific period of time. The issuer promises to pay you regular interest payments, and at the end of the bond term (maturity), the issuer should return the original amount you lent (principal). The sinking fund provision is designed to ensure the issuer can fulfill these promises, especially the latter one.

How Sinking Fund Provisions Work

A sinking fund provision forces the issuer to deposit a certain amount of money into a separate account (the sinking fund) each period. This money is then used to selectively redeem bonds early by purchasing them back from the bondholders. The process of early redemption will continue annually until the bond reaches its maturity date, at which point there should ideally be enough money in the sinking fund to pay off the outstanding principal. In doing so, the issuer is ensuring that they are gradually reducing their liability, thereby decreasing the default risk and making the bond investment safer for investors.

To implement this, the issuer may either buy the bonds back in the open market or call (repurchase at a predetermined price) the bonds from investors. The details of such redemption, such as the price and percentage of bonds to be retired early, are outlined in the bond’s indenture, a legal document that details the terms and conditions of the bond.

The Implications of a Sinking Fund Provision

Although the sinking fund provision is mainly designed to protect investors, it has both benefits and limitations.

Benefits for Investors

The most obvious benefit for the investor is the decreased risk. The issuer systematically retiring a portion of the outstanding bonds reduces the risk of the issuer’s inability to return the principal at maturity. Therefore, bonds with sinking fund provisions are generally considered safer investments.

Another advantage is the potential for early payment. If the bonds are called early, investors receive their initial investment back sooner and can re-invest it elsewhere.

Limitations for Investors

One of the main disadvantages for investors is the possibility of call risk. If the bonds are called when interest rates have fallen, investors may have to reinvest the returned principal at a lower interest rate, yielding lower returns.

Furthermore, if the bonds are purchased back on the open market, it is often the bonds traded at below par value that are picked up first. Hence, investors holding bonds with a higher market value risk losing out on potential market gains.


While the sinking fund provision adds a layer of security to bond investments, it’s important to carefully examine the provision’s requirements within the bond indenture. As with any financial decision, having a comprehensive understanding of all the elements involved will enable you to gauge potential opportunities and assess risks adequately. The sinking fund provision, although a somewhat complex concept, is a crucial aspect to comprehend when venturing into the world of bond investments.