CISI IISI Bond Prices and Interest-Rate Risk — UK Guide

Quick answer: separate the coupon from the market price

For CISI IISI bond-price questions, identify what is fixed and what can move. The coupon describes the promised cash income on the stated nominal amount. The market price reflects what an investor currently pays for those promised cash flows. A change in the price does not rewrite a fixed coupon, and a familiar coupon percentage does not tell you the investor’s full return.

The examples here hold the issuer’s promised payments constant and use hypothetical figures. They isolate one relationship rather than model every bond feature. Credit quality, maturity and contractual options can also matter. Follow the official material for the scope of your sitting. Before calculating, write three labels: promised income, purchase price and required return. Most conceptual mistakes become visible when a figure is placed under the wrong label or when a statement about one bond type is applied to every debt instrument.

Why an existing fixed coupon becomes less attractive

When comparable new opportunities offer a higher required yield, an unchanged coupon stream normally needs a lower purchase price to compete.

Imagine a fixed bond paying £40 annually on £1,000 nominal. If comparable market yields rise, its £40 promise has not increased to match them. A buyer may therefore be willing to pay less for that same income and eventual principal repayment. This explains the direction without requiring you to estimate an exact new price. The relationship works in reverse when comparable required yields fall.

Avoid turning this into a claim that every observed bond-price movement must be caused by interest rates. The question may supply a credit event or another changed assumption. For revision, keep all other facts unchanged and vary only required yield. Explain why the direction follows from the competing opportunities. Then introduce a credit deterioration and identify the separate influence. You should be able to distinguish an explanation of one price driver from a complete account of the traded price in an actual market.

Income yield is not the whole holding-period result

Coupon income, the price paid and the proceeds received on sale or redemption are separate components of an investor’s experience.

Suppose the hypothetical £40 coupon bond is bought for £950 and later sold for £920 after one annual coupon. Ignoring costs and tax, the investor has £40 income and a £30 capital loss, leaving £10 overall. Looking only at the positive coupon would conceal the price loss. The example does not establish yield to maturity, because the investor sells rather than holding every promised payment to redemption.

Now keep the coupon unchanged and replace the sale proceeds with £980. The capital result is a £30 gain and the simplified total is £70. These are invented arithmetic cases, not return forecasts. When a question asks about risk, identify which component could change. When it asks for a measure, name that measure before using a formula. Do not confuse receiving a coupon with avoiding a loss, or compare an income-only percentage with a total-return figure as though they described the same thing.

Interest-rate risk and credit risk answer different questions

Interest-rate risk concerns the price effect of changing market rates or yields; credit risk concerns the issuer’s ability to meet the promised obligations.

A bond can be exposed to changes in market yield even where the scenario assumes payments will be made as promised. It can also face issuer-payment uncertainty independently of the general rate environment. Labelling every bond loss a default confuses a market-price movement with failure to perform a contractual obligation. Read whether the question describes a change in value or a missed payment.

For a useful comparison, draw two short narratives. In the first, comparable required yields rise while the issuer’s position is unchanged. In the second, the issuer’s ability to pay deteriorates while the wider rate assumption is unchanged. State which risk each narrative isolates. A real case can involve both influences, but the exercise helps identify the concept being tested. Do not infer that a low-risk issuer has a permanently fixed market price, or that a high coupon demonstrates strong credit quality.

Check the direction before choosing the number

Identify the bond’s assumptions, predict the price direction, distinguish income from capital and then assess the exact measure requested.

Use a four-step note: fixed or variable payment, changed factor, expected direction and requested output. If a question changes comparable yields upward but your answer increases a conventional fixed bond’s price, revisit the logic before trusting the calculation. If the stem supplies a sale price, check whether the task is about the holding-period experience rather than a redemption measure.

When reviewing errors, label them precisely: coupon versus yield, price versus principal, credit versus market risk, or income versus total return. Change one input and solve again without the worked answer. These are ExamsPrep UK study suggestions rather than official assessment rules. Finish by explaining why a bond described as fixed income can still have a changing market value. That explanation captures the distinction which many otherwise accurate calculations miss: a fixed contractual cash flow does not guarantee a fixed resale price or a positive realised investment result.