Bond Features: Call, Convertible and Floating

Why This Topic Matters for the CTP Exam

Within the AFP CTP body of knowledge, the domain on Capital Structure and Long-Term Capital tests whether you understand how a company raises long-term debt and how the terms written into a bond indenture shift risk, cost and flexibility between the issuer and the investor. Call provisions, convertibility and floating-rate coupons are the three embedded features that appear most frequently in exam questions because each one directly changes (1) the coupon rate the issuer must pay, (2) who controls the timing of cash flows, and (3) how the bond behaves when interest rates or stock prices move. A treasury professional is expected to recommend which features to include when issuing debt, to understand why investors demand compensation for some features and accept lower yields for others, and to perform basic calculations such as conversion ratio, conversion value and yield to call. If you cannot explain in one sentence who benefits from each feature, you are not yet ready for this section.

What These Features Are

A plain-vanilla (or straight) bond pays a fixed coupon until maturity and then returns principal. Issuers and investors modify this basic contract through provisions in the indenture, the legal agreement administered by a trustee on behalf of bondholders. The three features examined here are:

1. Call Provision (Callable Bond)
A call provision gives the issuer the right, but not the obligation, to redeem the bond before maturity at a stated call price, usually par plus a call premium that declines over time. Key vocabulary:
• Call protection / deferred call: a period (often 5–10 years) during which the bond cannot be called. A bond that is non-callable for its entire life is sometimes labelled bullet or non-refundable.
• Call premium: the amount above par paid to compensate investors, frequently equal to one year of coupon in the first call year and stepping down thereafter.
• Make-whole call: the issuer pays the present value of remaining cash flows discounted at a Treasury yield plus a small spread, making the call economically neutral for investors and therefore rarely exercised purely for rate savings.
• Refunding: calling old high-coupon bonds and replacing them with new lower-coupon debt.
The mirror image is a put provision, which gives the investor the right to sell the bond back to the issuer at par on specified dates. The exam often pairs call and put features to test whether you know which party holds the option.

2. Convertible Bond
A convertible bond allows the bondholder to exchange the bond for a fixed number of shares of the issuer's common stock. It is a hybrid security: a straight bond plus an embedded call option on the issuer's equity. Essential terms:
• Conversion ratio: number of shares received per bond = Par value ÷ Conversion price.
• Conversion price: the effective price paid per share upon conversion, set above the stock price at issuance (typically 20–40% higher).
• Conversion value (parity): Conversion ratio × current stock price.
• Straight (investment) value: what the bond would be worth with no conversion feature, i.e., the floor set by its coupon and credit quality.
• Conversion premium: (Market price of convertible − Conversion value) ÷ Conversion value.
• Forced conversion: most convertibles are also callable; when the stock trades well above the conversion price, the issuer calls the bond, and rational investors convert rather than accept the lower call price.
Because investors receive upside participation in the stock, they accept a lower coupon than on comparable straight debt. The issuer gains cheaper financing and may ultimately retire the debt by issuing equity, but existing shareholders face dilution when conversion occurs.

3. Floating-Rate Note (FRN) / Variable-Rate Bond
A floating-rate bond pays a coupon that resets periodically (monthly, quarterly or semi-annually) based on a reference rate plus a fixed spread (margin) that reflects the issuer's credit quality. Historically the reference was LIBOR; today it is typically SOFR, the Treasury bill rate, or another benchmark. Related terms:
• Reset date and reset frequency: when and how often the coupon is recalculated.
• Cap: a maximum coupon that protects the issuer; floor: a minimum coupon that protects the investor; a collar combines both.
• Inverse floater: coupon moves opposite to the reference rate (a specialised structure occasionally mentioned).
Because the coupon tracks market rates, the bond's price stays close to par at each reset, giving the investor very low interest rate (price) risk but transferring cash flow uncertainty to the issuer, whose interest expense rises when rates rise. The investor still bears credit spread risk: if the issuer's creditworthiness deteriorates, the fixed spread becomes inadequate and the price falls.

How These Features Work: The Option Logic

The single most useful framework for the exam is to view every feature as an option and ask who owns it.

Callable bond value = Straight bond value − Value of the call option (held by issuer)
The investor has sold an option to the issuer, so the bond is worth less and the investor demands a higher yield. The issuer calls when market rates fall below the coupon, exposing investors to reinvestment risk and price compression (the price will not rise much above the call price, a phenomenon called negative convexity). Investors therefore evaluate yield to call (YTC) and yield to worst alongside yield to maturity. Advantages to the issuer: flexibility to refinance, to remove restrictive covenants, or to restructure capital. Disadvantage: a higher coupon than non-callable debt.

Putable bond value = Straight bond value + Value of the put option (held by investor)
Investors will exercise when rates rise or credit weakens, so they accept a lower yield. Issuers face liquidity risk from early redemption demands.

Convertible bond value = Straight bond value + Value of the equity call option (held by investor)
The investor owns the option, so the coupon is lower than straight debt. The convertible's market price should never fall below the greater of its straight value and its conversion value. When the stock price is far below the conversion price the convertible trades like a bond (busted convertible); when the stock price is far above, it trades like equity. From the issuer's perspective, convertibles are attractive for growth companies with volatile stock, because the embedded option is valuable and lowers interest cost, and for companies that want to issue equity at an effective price above today's market. Convertibles may be reported as either debt or a mix of debt and equity, and they affect diluted earnings per share.

Floating-rate bond: rather than an option, think of it as a rate-risk allocation. Fixed-rate debt gives the issuer cost certainty but exposes the investor to price risk. Floating-rate debt does the opposite. Treasury departments frequently issue in whichever market is cheaper and then use an interest rate swap to convert fixed to floating or floating to fixed, achieving the desired exposure. A floating-rate issue combined with a pay-fixed/receive-floating swap produces synthetic fixed-rate debt. Caps and floors are the tools that limit the extremes for either party.

Worked Calculation Examples

Example 1 – Convertible metrics. A $1,000 par convertible has a conversion price of $40. The stock trades at $50 and the bond trades at $1,300.
Conversion ratio = 1,000 ÷ 40 = 25 shares.
Conversion value = 25 × $50 = $1,250.
Conversion premium = (1,300 − 1,250) ÷ 1,250 = 4%.
If the bond were called at $1,050, the holder would convert (receiving $1,250 in stock) rather than accept $1,050 in cash.

Example 2 – Call decision. A company has $100 million of 8% bonds outstanding, callable at 104. New 10-year bonds can be issued at 5.5%. Annual interest savings = $100M × (8% − 5.5%) = $2.5 million. The call premium is $4 million, plus flotation costs on the new issue. Treasury compares the present value of the after-tax savings to the after-tax cost of calling; if positive, refunding is justified. The exam typically asks you to recognise the trade-off rather than complete a full NPV, but be prepared to identify the components.

Example 3 – Floating coupon. An FRN pays SOFR + 150 basis points, reset quarterly, with a 7% cap and 2% floor. If SOFR is 4.2% at the reset date, the coupon is 5.7%. If SOFR rose to 6.0%, the formula gives 7.5%, but the cap limits the coupon to 7.0%. If SOFR fell to 0.3%, the formula gives 1.8%, but the floor lifts the coupon to 2.0%.

Comparison Summary

• Call: Option held by issuer → higher coupon/yield demanded → benefits issuer when rates fall → investor bears reinvestment risk.
• Put: Option held by investor → lower coupon → benefits investor when rates rise → issuer bears refinancing/liquidity risk.
• Convertible: Equity option held by investor → lower coupon → issuer gets cheap financing and possible equity issuance → existing shareholders bear dilution.
• Floating: Coupon = reference + spread → price stays near par → investor has low price risk but keeps credit risk → issuer has uncertain interest expense (mitigated by caps or swaps).
• Sinking fund (often tested nearby): issuer retires a portion of the issue each year → reduces default risk → modestly lowers yield.

Exam Tips: Answering Questions on Bond Features: Call, Convertible and Floating

Tip 1 – Always identify who holds the option. The majority of conceptual questions reduce to this. Issuer-held options (call) raise the required yield; investor-held options (put, conversion) lower it. If an answer choice claims a callable bond carries a lower coupon than an otherwise identical straight bond, eliminate it immediately.

Tip 2 – Link the feature to the interest-rate scenario. Falling rates → issuer calls → investor reinvests at lower rates. Rising rates → investor puts or benefits from floating coupon → issuer pays more. Questions framed as 'which security would an investor prefer if rates are expected to rise' are pointing you to floating-rate or putable bonds.

Tip 3 – Memorise the three convertible formulas. Conversion ratio = Par ÷ Conversion price; Conversion value = Ratio × Stock price; Conversion premium = (Bond price − Conversion value) ÷ Conversion value. Read carefully whether the question gives the conversion price or the conversion ratio; candidates frequently divide when they should multiply.

Tip 4 – Know why an issuer chooses each feature. Call = flexibility to refinance or remove covenants. Convertible = lower coupon today and potential equity issuance at a premium, especially for growth or lower-rated firms. Floating = match floating-rate assets or take a view that rates will fall; often combined with swaps. Questions phrased from the treasury professional's viewpoint expect these motivations.

Tip 5 – Distinguish price risk from cash flow risk. A floating-rate note has minimal price risk for the investor but maximal cash flow risk for the issuer; a fixed-rate note is the reverse. Do not say floaters have 'no risk' – they retain credit spread risk and, for the issuer, interest expense risk.

Tip 6 – Watch for forced conversion. When a question states that a convertible is also callable and the stock trades well above the conversion price, the correct answer usually involves the issuer calling to force conversion, thereby converting debt to equity and eliminating interest payments.

Tip 7 – Use yield to worst for callable bonds. If a question asks how an investor should evaluate a callable bond trading at a premium, the answer is yield to call (or yield to worst), not yield to maturity, because a call is likely.

Tip 8 – Recognise make-whole calls as investor-friendly. A make-whole provision compensates the investor for lost interest, so it carries little or no yield penalty and is unlikely to be exercised simply to save interest cost.

Tip 9 – Eliminate answers that confuse debt and equity consequences. Only convertibles cause dilution. Calls and floating features never affect share count. If a question about EPS dilution or capital structure shifting toward equity appears, convertibles are the relevant feature.

Tip 10 – Read the scenario for the party's perspective. The CTP exam frequently asks the same fact pattern from the issuer's side in one question and the investor's side in another. Underline whether you are advising the treasurer or evaluating as an investor before choosing an answer, because the 'best' feature flips depending on the perspective.

Master the option-holder logic, the convertible arithmetic and the interest-rate scenario mapping, and you will be able to handle virtually any question the CTP exam presents on callable, convertible and floating-rate bonds.