What is a Sinking Fund?

Sinking Fund

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Sinking Fund

A sinking fund is a financial tool used by corporations and governments to set aside money over time to repay or “retire” long-term debt, such as bonds, when they mature. Instead of facing a large liability all at once upon maturity, the entity makes periodic payments into the sinking fund, ensuring that money will be available for repayment.

Key Features of a Sinking Fund:

  • Reduces Risk: By setting money aside periodically, the issuer ensures they will have sufficient funds to repay bondholders upon maturity.
  • Protection for Bondholders: A sinking fund offers bondholders more security, as it increases the likelihood that the issuer will have the funds necessary to repay the bond’s principal when it’s due.
  • Bond Redemption: Sometimes, the terms of the sinking fund allow the issuer to buy back a portion of the bonds in the open market before their maturity date. This can be beneficial to the issuer if the bonds are trading below their face value.
  • Determined by Agreement: The terms and conditions of a sinking fund, such as the amount of money that needs to be set aside and the frequency of payments, are usually specified in the bond indenture or the agreement between the issuer and the bondholders.

Example of a Sinking Fund

Let’s create a hypothetical example to illustrate how a sinking fund operates.


OceanTech Corp., a technology company specializing in marine equipment, decides to raise capital by issuing a bond. They issue a 5-year, $5 million bond to fund the development of a new underwater exploration drone. To assure investors of their commitment to repay the bond and to manage the liability efficiently, OceanTech establishes a sinking fund.


  • Bond Amount: $5 million
  • Bond Maturity: 5 years
  • Sinking Fund Annual Contribution: $1 million (Calculated as $5 million divided by 5 years)

Yearly Contributions to the Sinking Fund:

YearAnnual ContributionCumulative Total in Sinking Fund
1$1 million$1 million
2$1 million$2 million
3$1 million$3 million
4$1 million$4 million
5$1 million$5 million

Sinking Fund Operations:

  • Year 1: OceanTech allocates $1 million to the sinking fund. This amount is kept in a separate account or invested in low-risk securities to ensure it remains safe and grows modestly.
  • Year 2: OceanTech notices that their bonds are trading at 95% of face value in the market. They decide to use $950,000 from the sinking fund to repurchase $1 million face value of their bonds at a discount. After this, the sinking fund has a balance of $1.05 million.
  • Year 3-5: OceanTech continues its annual contributions. By the end of the 5th year, the sinking fund has accumulated $5 million, thanks to both the contributions and the minor gains from investments.
  • End of Year 5: The bond reaches maturity. OceanTech uses the $5 million from the sinking fund to repay the bondholders, thus settling its obligation.

This example demonstrates the dual advantages of a sinking fund: it offers a systematic way for issuers (OceanTech in this case) to prepare for a future liability, and it can also provide some financial flexibility if bonds can be repurchased at a discount. For investors, the sinking fund gives an added layer of security, as it shows the issuer’s proactive approach to managing its long-term liabilities.

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