A Note On Accounting For Employee Stock Options When Reporting Diluted Earnings Per Share Under The Treasury Stock Method

Abstract

Firms must currently apply the fair value method in determining the amount of employee compensation incurred in the case of employee stock options.  Current GAAP also requires that for purposes of calculating diluted earnings per share (EPS), the treasury stock method be applied where the assumed proceeds from exercise of the optioned shares is used to purchase shares of the firm’s stock at its average market price of the earnings period.  These incremental shares increase the denominator for purposes of calculating diluted EPS.  These requirements are consistent across the pronouncements of the Financial Accounting Standards Board (FASB) and the International Accounting Standards Board (IASB).  This study extends the work of Doran (2005) and Doran (2008).  These previous studies found that applying the treasury stock method where shares are assumed purchased at the average for the period price (instead of end of year price) understates the number of incremental shares (the denominator), which overstates diluted EPS.  However, these previous works assumed that no shares were actually purchased for the treasury during the earnings period.  The FASB indicates one reason that the average for the period price is appropriate is because if treasury shares purchases were to occur, “the shares would be purchased at various prices, not at the price at the end of the period.”  This study tests the notion that the average for the period price is appropriate under circumstances where the firm actually purchases shares for the treasury at its average market price during the earnings period.  This paper employs a simple one period model that assumes a risk free environment with complete certainty.  The model allows comparison of computed EPS with an a priori known, correct amount.  Consistent with Doran (2005) and Doran (2008), the results here again indicate that assuming purchase of treasury shares at their average market price of the earnings period understates the EPS denominator which results in EPS overstatement.  Correct diluted EPS is derived when the shares assumed purchased under the treasury stock method are acquired at the higher period ending market price.