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Fixed Income Security

A fixed income security is a type of investment where the borrower pays a set interest rate at regular intervals until the loan period ends. At the end of this period, the original invested money is paid back in full.

Think of it as a formal IOU where you act as the bank.

What it means

When you buy a fixed income security, you are essentially lending your money to a government, a municipality, or a large corporation. In return for your loan, the borrower promises to make regular interest payments, usually every six months, until the investment matures.

These investments are popular because they provide a predictable, steady stream of income, which makes financial planning much easier for both individuals and businesses. For non-finance managers, understanding fixed income is useful when looking at how organizations raise capital without giving up ownership.

While selling shares in a company means diluting ownership, issuing a fixed income security means borrowing money that must eventually be repaid. The investors who buy these products are typically seeking lower risk compared to the stock market, preferring stable returns over the potential for high growth.

In business practice, companies often invest their surplus cash into fixed income securities to earn a modest return while keeping funds relatively safe. Similarly, governments and corporations issue them to fund large projects, such as building new facilities or expanding operations.

The price of these securities can fluctuate on the open market before they mature, usually moving in the opposite direction of general interest rates, which is an important detail for treasury management. Managing fixed income investments requires balancing the return you receive against the financial health of the borrower.

If a company runs into serious financial trouble, it might default on its loan payments, meaning you could lose money. Therefore, assessing the creditworthiness of the issuer is a vital step before putting any cash into these instruments, ensuring your business cash reserves remain secure and productive.

In practice

Real-world examples.

1

Example

You invest 10,000 pounds in a five-year corporate bond paying 4 percent interest annually. You receive 400 pounds each year and get your 10,000 pounds back at the end.

2

Example

Your retail SME buys government bonds worth 25,000 pounds yielding 3 percent to safely earn interest on surplus cash reserves accumulated ahead of the Christmas trading period.

3

Example

A tech startup purchases municipal bonds worth 50,000 pounds issued by the local council, earning tax-advantaged fixed interest payments to support local infrastructure projects.

Think of it

Lending money to a friend who promises to pay you back five pounds every month for a year, and then returns your original hundred pounds on New Year's Eve.

Formula

Calculation

Annual Interest Payment = Face Value x Coupon Rate Example: If a bond has a face value of 1,000 pounds and a coupon rate of 5 percent, the annual interest payment is calculated as 1,000 x 0.05 = 50 pounds per year.

Case study

Seen in the real world.

Brighton Logistics, a mid-sized delivery firm, accumulated 200,000 pounds in surplus cash from a strong trading quarter. The finance manager decided to invest this idle money rather than leaving it in a low-interest current account. They purchased corporate fixed income securities yielding 4.5 percent annually, maturing in three years. This strategy generated 9,000 pounds in predictable yearly income, adding meaningful support to the annual profit margins without taking on the high volatility of the stock market. When the three-year term ended, Brighton Logistics recovered the full 200,000 pounds, which was then redeployed into purchasing new electric delivery vans for the expanding fleet.

Watch out

Common mistakes.

  • Assuming fixed income means zero risk of losing money if the issuer goes bankrupt.
  • Confusing the fixed interest payment with the changing market price of the security.
  • Ignoring inflation, which can reduce the real purchasing power of the fixed returns.

Questions

People also ask.

Are fixed income securities completely safe?

No, while they are generally safer than shares, you can lose money if the issuer defaults or goes bankrupt.

Can I sell my fixed income security before it matures?

Yes, most can be sold on the open market, but the price you receive might be higher or lower than what you paid.

Why are they called fixed income?

Because the interest payments are usually fixed at a set percentage when you first buy the security.

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Last updated · September 9, 2026
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Disclaimer

The information provided in this finance dictionary is for educational and informational purposes only. It should not be construed as financial, investment, legal, or tax advice. Always consult with a qualified professional before making any financial decisions. Money Master HQ makes no representations or warranties about the accuracy, completeness, or suitability of this information. Use of this content is at your own risk.