How is convertible preferred stock accounted for, and how does it affect diluted EPS?

Convertible preferred stock gives holders the right to exchange their preferred shares for a predetermined number of common shares. The accounting at issuance, conversion, and the EPS impact are all testable at CFA Level I.

Issuance — No Bifurcation Under US GAAP:

Unlike convertible bonds, convertible preferred stock under US GAAP is recorded entirely as equity — there is no separation of the conversion feature. The full proceeds go to preferred stock.

Under IFRS, if the conversion is at a fixed ratio, it is also classified entirely as equity.

Conversion Journal Entry:

When preferred stockholders convert, the book value method is used (no gain or loss recognized):

• Debit: Preferred Stock (at carrying value)
• Debit: APIC — Preferred (if any)
• Credit: Common Stock (par of new shares)
• Credit: APIC — Common (excess)

Worked Example — Stratton Holdings:

Stratton issued 20,000 shares of $50 par convertible preferred stock at $55 per share. Each preferred share is convertible into 4 common shares ($1 par).

At issuance:

Conversion of all 20,000 preferred shares:

Common shares issued = 20,000 × 4 = 80,000 shares

No gain or loss — total equity is unchanged.

Diluted EPS — If-Converted Method:

For diluted EPS, assume all convertible preferred shares were converted at the beginning of the period:

1. Add back preferred dividends to the numerator (because if converted, no preferred dividends would be paid)
2. Add the new common shares to the denominator

Stratton data for the year:

• Net income: $5,000,000
• Preferred dividends: $200,000 (20,000 × $50 × 4% dividend rate)
• Basic shares outstanding: 500,000
• Potential shares from conversion: 80,000

Basic EPS:

($5,000,000 − $200,000) / 500,000 = $9.60

Diluted EPS (if-converted):

$5,000,000 / (500,000 + 80,000) = $5,000,000 / 580,000 = $8.62

Since diluted EPS ($8.62) < basic EPS ($9.60), the convertible preferred is dilutive and must be included.

Key Exam Points:

1. Conversion uses book value method — never recognize gains or losses on conversion.
2. If diluted EPS > basic EPS after the if-converted adjustment, the preferred is anti-dilutive and excluded.
3. Cumulative preferred dividends are subtracted from net income for basic EPS regardless of whether declared.

Explore more EPS scenarios in our CFA Level I question bank.