ASC 260 is the U.S. GAAP standard governing earnings per share. It tells public companies how to calculate basic and diluted EPS, how to handle options, convertibles, and participating securities, and where those figures must appear in the financial statements. The rule applies to any entity whose equity or debt securities trade on a U.S. public market, and the SEC requires those companies to include EPS in the GAAP financial reports they file.1Financial Accounting Foundation. GAAP and Public Companies The Financial Accounting Standards Board maintains the rule inside the Accounting Standards Codification.2Financial Accounting Standards Board. Standards
Who Has to Present EPS
Every public company reports EPS. A company with only common stock outstanding has a simple capital structure and presents basic EPS alone. Any company that has issued securities capable of creating additional common shares has a complex capital structure and must present both basic and diluted EPS.
Private companies are not required to present EPS. If a private entity chooses to report it anyway, the full ASC 260 rulebook applies; there is no simplified version. Investment companies following ASC 946 and wholly-owned subsidiaries are also exempt.
How Basic EPS Is Calculated
Basic EPS is income available to common stockholders divided by the weighted-average number of common shares outstanding during the period.
The Numerator
Start with net income and subtract preferred stock dividends. Under ASC 260-10-45-11, the deduction covers dividends declared during the period on preferred stock plus dividends accumulated on cumulative preferred stock, whether or not those cumulative dividends were declared or earned. Preferred shareholders have a senior claim, and only what remains after that claim belongs to common holders.
Preferred dividends that are cumulative only if earned get deducted only to the extent they were actually earned during the period. If the company reports a net loss, preferred dividends increase the loss attributable to common shareholders rather than reduce it.
The Denominator
Shares are weighted by the portion of the period they were outstanding. Shares issued on July 1 count for half the year. Shares repurchased on October 1 drop out of the calculation from that date forward, whether the company cancels them or holds them in treasury. The weighting ties the share count to the income those shares helped generate; a share issued on the last day of the year contributed almost nothing to that year’s earnings, and the average reflects that.
How Diluted EPS Is Calculated
Diluted EPS shows what per-share earnings would be if every outstanding right to acquire common stock were exercised. Stock options, warrants, convertible bonds, and convertible preferred stock all sit behind the number. The calculation adjusts both the numerator (to reverse expenses that would not exist if certain securities had been common stock) and the denominator (to add the shares that would have been issued). Diluted EPS is always equal to or lower than basic EPS. If the math produces a higher number, something antidilutive has been included and needs to come out.
Treasury Stock Method for Options and Warrants
Options and warrants use the treasury stock method under ASC 260-10-45-22 through 45-27. Assume all in-the-money options are exercised, then assume the company uses the cash proceeds to buy back shares at the average market price during the period. The net share increase goes into the denominator.
An example: 10,000 options with a $20 exercise price, and the average market price for the quarter was $50. Exercise generates $200,000 in proceeds and 10,000 new shares. At $50, the proceeds buy back 4,000 shares. The denominator picks up 6,000 shares. The numerator is unchanged.
Options whose exercise price exceeds the average market price are out of the money. No holder would exercise, and the options are excluded from the calculation.
If-Converted Method for Convertibles
Convertible bonds and convertible preferred stock use the if-converted method under ASC 260-10-45-40. The calculation pretends conversion happened at the start of the period, or on the issuance date if later.
For convertible debt, add the after-tax interest expense back to the numerator and add the conversion shares to the denominator. A $10 million convertible bond at 5% produces $500,000 of interest; at a 21% federal corporate tax rate, the after-tax figure is $395,000.3Office of the Law Revision Counsel. United States Code Title 26 Section 11 – Tax Imposed That $395,000 is added back. One exception: convertible debt where the principal must be repaid in cash does not get its interest added back, because the cash obligation survives conversion.
For convertible preferred stock, the preferred dividends that were subtracted in basic EPS are added back to the numerator, and the conversion shares are added to the denominator. There is no tax adjustment; preferred dividends are not deductible.
Two-Class Method for Participating Securities
Some securities share in undistributed earnings alongside common stock. A security qualifies as participating if its contractual terms give it objectively determinable, nondiscretionary rights to share in those earnings. Participation does not need to be dollar-for-dollar; capped participation, threshold-based participation, and other measurable formulas all count. Unvested restricted stock carrying non-forfeitable dividend rights is the most common example.
The two-class method has two steps. First, allocate actual declared dividends to each class based on what was declared. Second, allocate the remaining undistributed earnings (net income minus total distributed earnings) to participating securities and common stock in proportion to their contractual participation rights. The allocation is required even if the company has no intention of paying dividends and even if legal restrictions block it; the calculation assumes all undistributed earnings were distributed.
If the contractual terms would allow the company to avoid distributing earnings to the participating security even in that hypothetical full-distribution scenario, undistributed earnings are not allocated to it. That situation applies to instruments whose participation rights only trigger on specific events such as liquidation.
Share-Based Payment Awards
Employee stock options and restricted stock with only a service condition go through the treasury stock method the same way as ordinary options. The service condition is assumed to be met. Assumed proceeds include the exercise price (if any) plus the average unrecognized compensation cost still being expensed under ASC 718.
For restricted stock with no exercise price, the only assumed proceeds are the unrecognized compensation cost. As the company recognizes more of that cost over the vesting period, the assumed proceeds shrink and the dilutive impact grows. Awards outstanding for only part of the period are time-weighted.
Awards with performance or market conditions are treated as contingently issuable shares, not potential common shares. They enter the diluted calculation only when the conditions are satisfied as of the reporting date, and they are weighted from the beginning of the period or the date of the contingency agreement, whichever is later.
The Antidilution Rule
If including a security in diluted EPS would raise the number instead of lowering it, that security is excluded. The purpose of diluted EPS is to show the floor, and any adjustment that lifts the figure defeats the purpose.
The control number for the test is income from continuing operations, not net income (ASC 260-10-45-20). A security might look dilutive against net income but be antidilutive against continuing operations, and the continuing-operations test governs.
Ranking Securities Individually
When a company has more than one type of potentially dilutive security, it cannot test them as a group. Each security or series of identical securities is ranked by earnings impact per incremental share, from most dilutive to least. Options and warrants generally rank first because they affect only the denominator. The company then adds each security to the calculation in sequence and rechecks diluted EPS after each addition. Once adding the next security would cause diluted EPS to rise, that security and everything less dilutive is excluded.
Out-of-the-Money Options
Stock options whose exercise price exceeds the average market price fail the test immediately. Under the treasury stock method, the assumed buyback would exceed the assumed issuance, producing a net share decrease and a higher EPS. These options are excluded. The situation is common during market downturns when share prices fall below strike prices.
When the Company Has a Loss
If the company reports a loss from continuing operations, adding any shares to the denominator would reduce the loss per share and make the number look less bad. That is antidilutive by definition. ASC 260-10-45-19 states that no potential common shares are included in the diluted calculation for any line item when a loss from continuing operations exists, even if net income turns positive after adjusting for discontinued operations. Basic and diluted EPS are equal in that period. Antidilutive securities still get disclosed in the notes so investors can gauge future dilution.
Preferred dividends still apply when computing loss per share. The loss available to common stockholders is the loss from continuing operations, increased by preferred dividends whether declared or cumulated.
Stock Splits, Stock Dividends, and Restatements
Stock splits and stock dividends change the share count without changing economic value. ASC 260 requires retroactive adjustment of every prior-period EPS figure presented so the numbers stay comparable. A two-for-one split means every historical EPS figure in the financial statements is recalculated on the post-split share count, as if the split had always been in effect.
The retroactive treatment applies even when the split occurs after year-end but before the statements are issued. A fiscal year ending December 31 followed by a split announcement on February 15 still requires the 10-K to reflect the split for every period presented. The company discloses that fact.
Rights issues that include a bonus element (an exercise price below fair value) also trigger retroactive adjustment for the bonus portion across all periods presented.
When prior-period results are restated for an error or a change in accounting principle, restated EPS is recalculated as if the corrected figures had been reported originally, and the per-share effect of the restatement is disclosed in the period it occurs. A restatement can flip the antidilution analysis: prior positive income from continuing operations may become a loss on restatement, turning previously dilutive securities antidilutive and changing the restated diluted EPS.
Where the Numbers Go and What to Disclose
ASC 260-10-45-2 puts EPS on the face of the income statement. Simple capital structures present basic EPS for income from continuing operations and for net income. Complex capital structures present both basic and diluted EPS for the same line items, with equal prominence; one cannot sit in a footnote while the other appears on the income statement. If the company reports a discontinued operation, per-share amounts for that component appear either on the income statement or in the notes.
The notes carry a reconciliation showing how the numerators and denominators of basic EPS become those of diluted EPS. That means the income amounts, share counts, and adjustments for each category of potentially dilutive security. Companies also disclose any securities excluded from diluted EPS as antidilutive during the period, so investors can track instruments that might become dilutive if market conditions shift.