Compound Financial Instruments: IFRS vs. US GAAP, EPS, and Tax

Compound financial instruments are single securities that create two economic relationships at once: a debt claim the issuer must repay in cash, and an equity claim the holder can trigger by converting into shares. How they land on the books depends entirely on which framework the issuer reports under. IFRS requires splitting the instrument into a liability piece and an equity piece at issuance. Current US GAAP, after ASU 2020-06, treats most convertible debt as a single liability with no split. That divide drives almost every other accounting question these instruments raise.

What Makes an Instrument Compound

Two features have to sit inside the same contract. The first is a liability: the issuer owes the holder cash through interest, principal at maturity, or both. The second is an equity feature: the holder can convert that debt claim into ownership shares. Neither is a side agreement. Both are embedded from the start.

IAS 32 puts it in those terms: from the issuer’s perspective, a convertible bond comprises a financial liability (the obligation to deliver cash) and an equity instrument (a call option granting the holder the right to convert into a fixed number of ordinary shares). The economic effect is the same as issuing a plain bond and a set of share-purchase warrants simultaneously.¹

The word fixed is doing real work here. If the number of shares the holder receives varies with market conditions, the conversion feature may need to be treated as a derivative liability rather than an equity component, which is a different accounting problem.

Common Examples

Convertible Bonds

The standard case. A company issues a bond that pays a fixed coupon and returns principal at maturity, and the holder can swap the bond for a set number of shares before or at maturity. Because the conversion right adds value for the investor, the issuer can offer a lower coupon than it would on a straight bond of the same credit quality. If the share price rises enough, the holder converts. If it doesn’t, the holder collects interest and gets principal back.

Notes With Detachable Warrants

A company can issue a debt note alongside a separate warrant certificate that lets the holder buy shares at a fixed price. The warrant can sometimes trade independently of the note, which is the main difference from an embedded conversion feature. The note itself still carries full repayment obligations. These structures are common in mezzanine financing, where lenders demand equity upside for taking on higher credit risk. Because the warrant is a freestanding instrument, proceeds are allocated between the note and the warrant using the relative fair value method rather than the residual approach used for embedded conversions.

Convertible Preferred Stock

Preferred stock that converts into common shares at the holder’s option raises similar classification questions. Under IFRS, if the preferred carries a mandatory dividend obligation and a conversion right, the compound-instrument analysis applies. Under US GAAP, convertible preferred stock is generally recorded as a single equity instrument after ASU 2020-06 eliminated the beneficial conversion feature model.

Contingently Convertible Bonds (CoCos)

Contingently convertible bonds absorb losses when a bank’s capital falls below a set threshold. Unlike ordinary convertibles where the holder chooses whether to convert, CoCos convert automatically when triggered. Triggers are typically mechanical, activating when the bank’s Common Equity Tier 1 ratio falls below a preset level relative to risk-weighted assets, or discretionary, where regulators force conversion when they judge the bank is approaching insolvency. CoCos are mostly a bank-capital feature under Basel III, and the contingent trigger adds complications on top of standard compound-instrument accounting.

Why IFRS and US GAAP Treat These Instruments Differently

This is where confusion originates, and the gap widened in recent years rather than closing.

Under IFRS, IAS 32 requires the issuer to classify the liability and equity components separately in the balance sheet. The liability is measured first at fair value, and the residual amount goes to equity. This split accounting has been the IFRS rule since IAS 32 was first issued.¹

Under US GAAP, FASB’s ASU 2020-06 eliminated the two models that previously required a similar split: the cash conversion model and the beneficial conversion feature model. After ASU 2020-06, most convertible debt is accounted for in its entirety as a single liability. No portion of the proceeds is allocated to the conversion feature unless the feature has to be separately accounted for as an embedded derivative under ASC 815-15. The update became effective for large SEC filers in fiscal years beginning after December 15, 2021, and for all other entities in fiscal years beginning after December 15, 2023. It now applies to essentially every US reporting entity.²

The practical result: under the old US GAAP models, creating an equity component generated a discount that got amortized as extra interest expense over the life of the bond. Reported interest expense ran well above the cash coupon. Under the new single-liability model, reported interest expense sits close to the cash coupon because there is no artificial discount to amortize. IFRS issuers, by contrast, still carry that higher interest expense from the split.

IFRS Split Accounting, Step by Step

IAS 32 uses the residual value method. The sequence is strict: measure the liability first, then assign whatever is left to equity.³

To value the liability component, work out what a similar bond without any conversion feature would be worth in the current market. That means the present value of all future cash flows (interest and principal) discounted at the market rate for equivalent non-convertible debt issued by the same company. That market rate will be higher than the coupon on the convertible, because the conversion right lets the issuer pay a lower coupon. The gap between total proceeds and the fair value of the liability is the equity component.

Worked Example

Take the illustrative example accompanying IAS 32. An entity issues 2,000 convertible bonds at par with a face value of CU 1,000 each, receiving CU 2,000,000 in total. The bonds carry a 6 percent annual coupon paid in arrears over three years, and each bond is convertible into 250 ordinary shares at any time before maturity. The market rate for similar non-convertible debt is 9 percent.³

Discounting the future cash flows at 9 percent:

Present value of principal: CU 2,000,000 due in three years, discounted at 9 percent, equals CU 1,544,367
Present value of interest: CU 120,000 per year for three years, discounted at 9 percent, equals CU 303,755
Total liability component: CU 1,848,122
Equity component (residual): CU 2,000,000 minus CU 1,848,122, equals CU 151,878

The CU 151,878 equity component reflects the premium investors will pay for the conversion right. It goes into shareholders’ equity and is never remeasured. The CU 1,848,122 liability sits at that initial amount and accretes toward the CU 2,000,000 face value over three years through the effective interest method.

Transaction costs get split between the two components in the same proportion as the proceeds allocation. Costs allocated to the liability increase the effective interest rate because a larger discount now accretes over the same term.³

Single-Liability Accounting Under US GAAP

After ASU 2020-06, most convertible debt accounting is straightforward. All proceeds go to the liability. No equity component, no residual allocation, no discount to amortize beyond any standard original issue discount. Interest expense equals the coupon (plus amortization of issuance costs, recorded as a debt discount).

The exception is narrow. If the conversion feature meets the definition of an embedded derivative that must be bifurcated under ASC 815-15, or the convertible is issued at a substantial premium attributable to the conversion right, the issuer accounts for that premium separately. In practice, the bifurcation exception applies mostly to convertibles with exotic features like contingent exercise or settlement in a variable number of shares. Plain-vanilla convertible bonds fall squarely into the single-liability model.

Notes issued with detachable warrants work differently, because the warrant is freestanding rather than embedded. Proceeds are allocated between the note and the warrant using relative fair value, and issuance costs follow the same allocation.

Ongoing Measurement: The Effective Interest Method

Whichever framework applies, the liability is measured after issuance using the effective interest method. Each period’s interest expense equals the effective interest rate times the opening carrying value of the liability, not the face value.

Back to the IFRS example. The liability starts at CU 1,848,122, but the company pays only CU 120,000 in cash interest each year (6 percent of face). The effective rate is 9 percent, so first-year interest expense is CU 1,848,122 × 9%, or CU 166,331. The difference between that expense and the cash paid (CU 46,331) is added to the carrying amount of the liability. Year two starts at CU 1,894,453, and the calculation runs from there. By maturity, the carrying amount has accreted to the full CU 2,000,000.

That mechanic is why IFRS reporters show higher interest expense on convertibles than US GAAP reporters for economically identical instruments. The split creates a built-in discount that has to be amortized. Under the US GAAP single-liability model, the carrying amount starts at or near face value, and reported interest expense tracks the actual coupon.

What Happens at Conversion

Under IFRS, when the holder converts at maturity, the entity derecognizes the liability and moves it into equity. The original equity component stays in equity, though it may be reclassified between equity line items (from “equity component of convertible bond” to share capital and share premium, for example). IAS 32 is explicit: no gain or loss arises on conversion at maturity.³

For early conversion, the liability’s carrying amount at the conversion date (not its face value) moves to equity along with the original equity component. Again, no gain or loss. The shares issued are recorded at the combined carrying amount of both components, avoiding any fair value remeasurement.

Under US GAAP, since there is usually no separate equity component to begin with, the carrying amount of the entire convertible (including any unamortized issuance costs) reclassifies to equity on conversion. The specific accounting depends on whether the conversion follows original terms or is an induced conversion, but the principle is the same: liability out, equity in, by the same amount.

One IFRS detail worth flagging: the classification of the liability and equity components is never revised based on changes in the likelihood of conversion.¹ Even if the stock price collapses and conversion becomes worthless, the equity component stays in equity at its original amount. The cash obligation remains a liability until settled.

Effect on Diluted EPS

Compound instruments affect diluted EPS because they represent potential common shares. The method depends on the instrument type.

Convertible Bonds: If-Converted Method

Diluted EPS for convertibles uses the if-converted method. The calculation assumes conversion happened at the start of the reporting period (or the issuance date, if later). Shares issuable on conversion are added to the denominator, and the after-tax interest expense that would not have been recognized had the bonds been converted is added back to the numerator. Under ASU 2020-06, the if-converted method is required for all convertible instruments under US GAAP; the treasury stock method is no longer permitted for convertible debt.

An anti-dilution safeguard applies: if the adjustment would raise EPS, the conversion is treated as anti-dilutive and excluded from the diluted EPS calculation.

Detachable Warrants: Treasury Stock Method

Warrants use the treasury stock method. The calculation assumes exercise and that the company uses the proceeds to buy back shares at the average market price for the period. Only in-the-money warrants count. Out-of-the-money warrants are ignored because a rational holder would not exercise. Each warrant is evaluated on its own, not in aggregate.

Federal Tax Treatment for Issuers

Tax treatment diverges from book treatment in ways that create book-tax differences.

Interest Deductibility and Disqualified Debt

For most convertible bonds, the issuer deducts interest on the same basis as ordinary debt. Internal Revenue Code Section 163(l) denies any interest deduction on a “disqualified debt instrument,” defined as debt payable in equity of the issuer or a related party. Debt is treated as payable in equity when a substantial amount of principal or interest must be paid in, or is convertible into, the issuer’s stock, or when principal or interest is determined by reference to the value of the issuer’s equity.⁴

Ordinary convertibles where the holder chooses whether to convert generally do not trigger the rule, because conversion is optional. But if there is “substantial certainty” the holder will exercise, the debt can still be treated as payable in equity. This becomes a live issue for deep-in-the-money convertibles where exercise is essentially guaranteed.⁴

Original Issue Discount

For tax purposes, the issue price of a convertible bond includes any amount attributable to the conversion privilege. This is different from IFRS, where that value is stripped out into equity. Any original issue discount (the excess of the stated redemption price at maturity over the issue price) is calculated the same way as for non-convertible debt.⁵

Repurchase at a Premium

If the issuer repurchases a convertible at a premium, IRC Section 249 limits the deduction for the portion of the premium attributable to the conversion feature. The issuer can only deduct the amount representing a normal call premium on equivalent non-convertible debt. Any excess is disallowed unless the issuer can show the IRS that the entire premium reflects borrowing cost rather than the conversion right.⁶

Presentation and Disclosure

Under IFRS, the liability sits in long-term liabilities (or current liabilities as maturity approaches), and the equity component is presented within shareholders’ equity, typically as a separate reserve. The equity component is never remeasured. Under US GAAP, the convertible appears as a single line in liabilities, and disclosure carries more of the explanatory load.

Both frameworks require disclosure of the conversion terms, including the conversion ratio and any conditions that must be met before conversion. The effective interest rate used for subsequent measurement goes in the notes, along with the face amount and maturity date. If conversion occurred during the period, the entity discloses the shares issued and the effect on outstanding share capital. IFRS reporters present the carrying amounts of both components separately, on the face of the balance sheet or in the notes.

Early redemption features add a layer. If the issuer can call the bonds before maturity, the notes describe the call terms and any penalties. If conversion is triggered by events outside the holder’s control, as with CoCos, the nature of those triggers has to be disclosed so investors can assess timing and dilution risk.

1
IFRS Foundation. IAS 32 Financial Instruments Presentation
2
FASB. ASU 2020-06 Debt With Conversion and Other Options
3
IFRS Foundation. IAS 32 Financial Instruments Presentation
4
Office of the Law Revision Counsel. 26 USC 163 – Interest
5
eCFR. 26 CFR 1.163-4 – Deduction for Original Issue Discount on Certain Obligations Issued After May 27, 1969
6
GovInfo. 26 USC 249 – Limitation on Deduction of Bond Premium on Repurchase