Earnings Per Share Calculation (ASC 260)
Earnings per share (EPS) under ASC 260 measures net income attributable to common shareholders on a per-share basis, requiring all public entities to present both basic EPS (using the weighted average common shares outstanding) and diluted EPS (reflecting the dilutive effect of all potential common shares).
ASC 260, Earnings Per Share, establishes detailed rules for computing and presenting EPS that go well beyond simply dividing net income by shares outstanding. The standard's complexity arises from the need to handle complex capital structures with multiple share classes, convertible securities, options, warrants, contingent shares, and instruments with features that affect both the numerator (income available to common shareholders) and the denominator (share count).
Basic EPS begins with the numerator: income from continuing operations less dividends declared on preferred stock (and any premium paid on the repurchase of preferred stock in excess of its carrying amount). The denominator is the weighted average number of common shares outstanding during the period, calculated by weighting each share by the fraction of the period it was outstanding. A stock split or stock dividend requires retroactive adjustment to all prior periods presented, as though the additional shares had always been outstanding.
Diluted EPS adjusts both the numerator and the denominator to reflect the impact of all dilutive potential common shares. For each category of dilutive security, the analyst must determine the effect on EPS individually — calculating the incremental EPS impact — and then include those securities in the diluted calculation only if they are dilutive (i.e., their inclusion reduces EPS or increases a per-share loss). The securities are typically included in order from most dilutive to least dilutive, checking at each step whether the running diluted EPS remains lower than basic EPS.
Dividends on cumulative preferred stock are deducted from income for basic EPS whether or not they were declared. Dividends on non-cumulative preferred stock are deducted only to the extent declared. Undistributed earnings allocated to participating securities (such as unvested restricted shares with dividend rights) under the two-class method further reduce income available to common shareholders in both basic and diluted EPS.
The presentation requirements under ASC 260 mandate that both basic and diluted EPS be presented on the face of the income statement for each period presented, with equal prominence. Reconciliations of numerators and denominators must appear either on the face of the statement or in the notes. Entities with complex capital structures must also disclose the number and type of anti-dilutive securities excluded from the diluted calculation, giving financial statement users the information needed to assess the potential dilution exposure that is not currently reflected in reported diluted EPS.