Compound convertibles: split initial liability and equity
A low cash coupon does not measure the full financing expense of a compound convertible. The issuer may have received cash for both a repayment obligation and a qualifying equity conversion option. A useful research worksheet separates those components at issue, then explains how the liability grows even while the company pays every coupon on time.
This exercise concerns an Australian for-profit issuer applying AASB 132 to a 2025 annual period. The December 2022 compilation covers periods beginning on or after January 1, 2023 and before July 1, 2026. It is a historical version selected for this example, not a claim that every issuer reporting in 2026 uses that compilation.
Establish classification before discounting
Read the actual conversion and settlement provisions first. For this example, the instrument is non-derivative, issued at par, and convertible at the holder’s option into a fixed number of the issuer’s ordinary equity shares for a fixed amount in its functional currency. Assume all relevant equity classification conditions are satisfied. There are no resets, cash settlement alternatives, early redemption provisions, transaction costs, taxes, or embedded features requiring separate treatment.
AASB 132 paragraphs 28–32 and AG30–AG35 explain the compound-instrument approach. The initial liability is measured using comparable debt without the equity conversion feature; the equity component is the residual. These rules do not authorize treating every security called a convertible as partly equity.
Create a contract checklist with face amount, currency, coupon dates, maturity, conversion ratio, settlement choices, and amendment history. A press release describing “cheap convertible financing” is not enough. Missing settlement clauses make the classification provisional, even when the cash-flow arithmetic is straightforward.
Work the initial split
All amounts below are hypothetical and in thousands of currency units. The company receives 100 at issue. The note runs for three years, pays a 4% annual cash coupon at each year-end, and repays 100 at the third year-end if the holder does not convert. The market yield for otherwise comparable non-convertible debt at issuance is assumed to be 8%.
The liability is the present value of three coupons of 4 and principal of 100:
Liability = 4/1.08 + 4/1.08² + 104/1.08³ = 89.691612.
Equity = proceeds 100 − liability 89.691612 = 10.308388.
| Initial item | Amount | Independent check |
|---|---|---|
| Cash received | 100.000000 | Issue proceeds, before excluded costs |
| Liability component | 89.691612 | Contractual debt cash flows discounted at 8% |
| Equity component | 10.308388 | Residual needed to reconcile proceeds |
| Total financing recognized | 100.000000 | Liability plus equity |
The 10.308388 is neither a cash fee nor an immediate expense. It is an equity component arising from this qualifying instrument. The company has not received 110.308388. Equally, the liability’s initial carrying amount below face does not reduce the contractual principal due.
The 8% input needs its own evidence. Compare currency, seniority, collateral, maturity, issuer credit, and payment structure at the issue date. A later yield or a government bond rate alone is not automatically an appropriate substitute. Public filings may disclose management’s selected rate without enough comparable transactions to reproduce it; retain that limitation beside the calculation.
Reconcile interest through maturity
For this simplified liability schedule, apply the assumed effective yield to each opening balance, subtract the cash coupon, and retain full precision until presentation.
| Year | Opening liability | Interest at 8% | Cash coupon | Closing before principal |
|---|---|---|---|---|
| 1 | 89.691612 | 7.175329 | 4.000000 | 92.866941 |
| 2 | 92.866941 | 7.429355 | 4.000000 | 96.296296 |
| 3 | 96.296296 | 7.703704 | 4.000000 | 100.000000 |
The first year’s liability rises by 3.175329 despite timely payment of 4. That increase is the difference between financing expense of 7.175329 and cash interest of 4. Across three years, expense totals 22.308388: cash coupons of 12 plus accretion of 10.308388. After the final coupon, payment of principal 100 extinguishes the liability in the assumed no-conversion case.
A common spreadsheet error discounts principal correctly but forgets the coupons, producing an overstated equity residual. Another uses 4% on the liability balance, preventing the schedule from reaching face value. Check both the initial present value and the terminal balance; either alone can miss a wrongly timed payment.
Do not round the initial liability to 89.69 inside the model and then treat the resulting final rounding difference as an economic gain. Calculate with unrounded inputs, show rounded display values, and document any last-period display adjustment.
Keep equity separate from changing conversion odds
Suppose the share price falls sharply after issue. The investor now appears unlikely to convert. That development does not by itself move the original equity component into debt or permit a new initial split. Paragraph 30 addresses changes in exercise likelihood. The original contractual obligation also remains relevant until settlement or another event changes the accounting analysis.
Conversely, a rising share price does not make the cash principal disappear before conversion occurs. Separate contractual maturity exposure from a scenario that assumes conversion. A cash forecast should show the redemption case and any conversion scenario explicitly; the accounting split is not a prediction of the holder’s eventual choice.
At maturity without conversion, do not send the unused equity component through operating profit merely because the option expired. The residual has been equity throughout this simplified example. Any transfer between equity accounts needs appropriate presentation and cannot manufacture a cash inflow.
A boundary that changes the mechanism
Replace the fixed-share conversion clause with an obligation to deliver a variable number of shares worth a fixed cash amount. Now a superficially similar “share settled” contract may fail equity classification. The worksheet must return to the liability/equity conditions instead of assigning 10.308388 to equity by habit. Cash alternatives, contingent settlement and foreign-currency terms also require their own assessment; paragraphs 15–27 provide relevant classification context.
This is a classification boundary, not just a new discount rate. If the conversion feature is a liability derivative, subsequent measurement can create a different profit pattern. The simple accretion table cannot establish that treatment, and its residual is not a substitute for valuing a required derivative.
Transaction costs create another scope limit. The example excludes them. Paragraph 38 addresses allocation between components, while tax effects require the applicable tax standard. A real issuer’s net proceeds, liability, and equity therefore need not equal the cost-free figures above. Record exclusions rather than presenting the teaching model as a complete issuance journal.
An executable evidence sheet
| Step | Obtain or calculate | Acceptable result | If unavailable |
|---|---|---|---|
| Identify the instrument | Executed terms and amendments | Same series, currency and issue date | Mark classification unresolved |
| Test equity feature | Conversion and settlement clauses | Conditions separately documented | Do not create residual equity |
| Rebuild cash flows | Coupon calendar and redemption amount | Every dated contractual payment included | Show missing dates explicitly |
| Support yield | Issuance-date comparable-debt evidence | Credit and contractual differences explained | Use sensitivity, not a verified rate claim |
| Reconcile recognition | Proceeds and component note | Liability plus equity equals stated basis | Investigate costs, tax and other features |
| Roll forward | Interest note and debt movement | Opening plus expense less coupon closes | Separate FX, modifications and conversions |
Published annual reports and offering documents may support the terms and reported split. Management’s valuation files, detailed comparable-credit adjustments, and complete general ledger usually are not public. An investor can test consistency and identify missing inputs without claiming to have reconstructed the auditor’s work.
If the annual report’s liability differs from the model, first align issue date, first coupon length, currency and gross versus net proceeds. Then investigate fees, taxes, conversion events and amendments. Do not force the rate to an arbitrary number merely to match the closing balance.
Update the worksheet when a signed amendment changes settlement terms, a conversion actually occurs, additional issuance-date valuation information emerges, or a later applicable standard version changes the analysis. Preserve the original model and record why the revised conclusion differs.
Record a rate sensitivity without changing the contract
Keeping all contractual payments fixed, a 6% comparable-debt yield gives a liability of 94.653976 and residual equity of 5.346024. A 10% yield gives a liability of 85.078888 and equity of 14.921112. Proceeds remain 100 in both cases. This sensitivity tests the issuance-date valuation input, not a right to change the original split each time market yields move.
Save the comparable-debt selection and sensitivity together. A reviewer should be able to identify whether disagreement concerns the actual payment dates, classification, or valuation rate. Changing several assumptions simultaneously hides the source of the difference and weakens the usefulness of the worksheet.
FAQ
Is the coupon the effective financing rate?
No. In the stated example cash is 4 per year, while first-year liability expense is 7.175329 under the 8% assumption.
Does falling conversion probability eliminate equity?
Not by itself. The contractual classification and actual settlement events must be examined separately.