How do stock dividends and stock splits affect the EPS calculation?

Stock dividends and stock splits require retroactive adjustment of the weighted average shares outstanding — this is a critical EPS concept that is frequently tested.

The core rule: Stock dividends and stock splits do not raise any cash and do not change the economic ownership of existing shareholders. Therefore, accounting standards require that you treat them as if they occurred at the beginning of the earliest period presented. All prior-period EPS figures must also be restated.

Stock Split Example:

Ridgeway Pharmaceuticals had 1,000,000 shares outstanding on January 1, 2026. On July 1, 2026, Ridgeway executes a 2-for-1 stock split. No other share transactions occur.

Incorrect approach: Weighted average = (1,000,000 x 6/12) + (2,000,000 x 6/12) = 1,500,000

Correct approach: The split is applied retroactively to the full year:

Weighted average = 2,000,000 for the entire year

Also, if Ridgeway reported basic EPS of $3.00 for 2025 (based on 1,000,000 shares), the 2025 EPS is restated to $1.50 for comparability.

Stock Dividend Example:

Castleton Energy has 500,000 shares outstanding all year and declares a 10% stock dividend on October 1, 2026. This creates 50,000 new shares.

Weighted average shares = 500,000 x 1.10 = 550,000 (the 10% factor is applied to the entire year, not just from October 1)

Combining stock dividends with other share changes:

Here is where it gets tricky. If Castleton also issued 100,000 new shares for cash on April 1, 2026:

The stock dividend factor (1.10) is applied to all shares outstanding before the stock dividend date, including the April share issuance. Only shares issued after the stock dividend date would not get the factor.

Key distinctions:

Exam tip: When a question involves both a stock split/dividend and a share issuance, apply the split/dividend factor retroactively but weight the share issuance from its actual date. This combination question is a CFA Level I favorite.

For more EPS practice, explore our CFA Level I question bank on AcadiFi.