Why is the Treasury Stock Method not used for calculating dilution from convertible bonds?

Why is the Treasury Stock Method not used for calculating dilution from convertible bonds?

• A. Because it only applies to stock options.
• B. Because the company does not receive cash from the dilutive instrument.
• C. Because diluted shares are always fixed.
• D. Because convertibles are always in-the-money.

Answer: (B)

The key idea is that the Treasury Stock Method relies on cash coming in from the dilutive instrument to repurchase shares. When options or warrants are exercised, the company collects cash and can use that money to buy back shares, so the net increase in shares outstanding equals the new shares issued minus shares repurchased with those proceeds. Convertible bonds don’t provide cash to the company when they convert: holders exchange debt for equity, so there’s no cash inflow to fund any share repurchases. Because of that, the Treasury Stock Method isn’t the correct framework for calculating dilution from convertibles. Instead, the if-converted method is used, which assumes the convertibles are converted into shares and adjusts for the related impact (such as the elimination of interest expense that would have been paid on the debt).

The key idea is that the Treasury Stock Method relies on cash coming in from the dilutive instrument to repurchase shares. When options or warrants are exercised, the company collects cash and can use that money to buy back shares, so the net increase in shares outstanding equals the new shares issued minus shares repurchased with those proceeds. Convertible bonds don’t provide cash to the company when they convert: holders exchange debt for equity, so there’s no cash inflow to fund any share repurchases. Because of that, the Treasury Stock Method isn’t the correct framework for calculating dilution from convertibles. Instead, the if-converted method is used, which assumes the convertibles are converted into shares and adjusts for the related impact (such as the elimination of interest expense that would have been paid on the debt).