Earnings per share can look like a simple division, but AS 20 becomes more technical as soon as the share count changes during the year, preference dividends exist, bonus or rights issues occur, or convertible instruments could create additional equity shares. The reliable way to calculate EPS is to separate the problem into two questions: what earnings belong to equity shareholders, and how many equity shares should be treated as outstanding for the relevant calculation.
ICAI currently lists AS 20 Earnings Per Share as an Accounting Standards Board publication, and the official AS 20 text sets out the detailed measurement, presentation, restatement and disclosure requirements. The standard is also included in ICAI's Accounting Standards collection as on April 1, 2025.
Basic EPS: start with the correct numerator
AS 20 states that basic EPS is calculated by dividing the net profit or loss for the period attributable to equity shareholders by the weighted average number of equity shares outstanding during the period. The numerator is therefore not automatically the bottom-line profit shown before considering the rights of preference shareholders.
For basic EPS, preference dividends and any attributable tax effect are deducted in arriving at earnings attributable to equity shareholders. For non-cumulative preference shares, the amount provided for the period is considered. For cumulative preference shares, the full amount required for the period is considered whether or not it has actually been provided for; dividends relating to earlier periods that happen to be paid or declared in the current period are not treated as current-period preference dividends for this calculation.
Weighted-average shares: why the closing share count is often wrong
The denominator for basic EPS is a weighted average, not simply the number of shares outstanding on the balance-sheet date. AS 20 adjusts the opening share count for shares issued or bought back during the period according to the time for which those shares were outstanding. A reasonable approximation is permitted in many circumstances, but the method should reflect the actual timing of the capital change.
Worked example: basic EPS with a mid-year issue
Assume a company earns a net profit of ₹1.20 crore for the year. Cumulative preference dividend required for the year is ₹10 lakh, leaving ₹1.10 crore attributable to equity shareholders for this simplified example. The company has 10 lakh equity shares outstanding for the first six months and issues another 2 lakh shares for cash on 1 July, so 12 lakh shares are outstanding for the final six months.
- First six months: 10 lakh × 6/12 = 5 lakh weighted shares.
- Final six months: 12 lakh × 6/12 = 6 lakh weighted shares.
- Weighted-average equity shares = 11 lakh.
- Basic EPS = ₹1.10 crore divided by 11 lakh shares = ₹10 per share.
If the year-end share count of 12 lakh were used instead, EPS would be understated because the extra 2 lakh shares were not outstanding for the entire year.
Bonus issues and share splits are different
A bonus issue or share split changes the number of shares without a corresponding increase in the enterprise's resources. AS 20 therefore does not treat those new shares like an ordinary cash issue from the date of issue. Instead, the share count is adjusted as if the bonus issue or split had occurred at the beginning of the earliest period presented, and basic and diluted EPS for comparative periods are restated accordingly.
The same principle is important when a bonus issue or share split occurs after the balance-sheet date but before the financial statements are approved by the board: AS 20 requires the per-share calculations for those financial statements and prior periods presented to be based on the new number of shares, with disclosure that the calculation reflects the change.
Rights issues may contain a bonus element
A rights issue needs separate attention when the exercise price is below the fair value of the shares immediately before exercise. AS 20 treats such a rights issue as containing a bonus element. For periods before the rights issue, the pre-rights share count is adjusted using a factor based on the fair value immediately before exercise and the theoretical ex-rights fair value. This prevents the discounted element of the rights issue from creating a misleading jump in EPS merely because the denominator changed.
Diluted EPS: test what happens if potential shares become equity
Diluted EPS asks what EPS would look like if dilutive potential equity shares were converted or exercised. Examples of potential equity shares in AS 20 include convertible debt or preference shares, warrants, options, employee share option arrangements and certain contingently issuable shares.
For diluted EPS, the numerator and denominator are adjusted for the effects of dilutive potential equity shares. Where a convertible debt instrument is assumed to convert, for example, the numerator is increased by the interest expense that would no longer be incurred, adjusted for the attributable tax effect, while the denominator is increased by the additional equity shares that would have been issued on conversion.
Worked example: convertible debt
Assume profit attributable to equity shareholders is ₹90 lakh and the weighted-average number of equity shares is 30 lakh. Basic EPS is therefore ₹3.00. Now assume convertible debt outstanding throughout the year would, on conversion, add 6 lakh equity shares. The interest expense that would be avoided is ₹6 lakh and the related tax effect for this illustrative calculation is ₹1.5 lakh.
- Adjusted earnings = ₹90 lakh + ₹6 lakh − ₹1.5 lakh = ₹94.5 lakh.
- Adjusted shares = 30 lakh + 6 lakh = 36 lakh.
- Diluted EPS = ₹94.5 lakh divided by 36 lakh = approximately ₹2.63.
The example uses an assumed tax effect only to demonstrate the mechanics; it is not a statement of any current tax rate. In a live calculation, the adjustment must reflect the actual terms and relevant tax consequences of the instrument.
Do not include anti-dilutive instruments
Potential equity shares are dilutive only when their assumed conversion would reduce EPS from continuing ordinary operations. If conversion would increase EPS, or reduce a loss per share, the instrument is anti-dilutive and its effect is ignored in diluted EPS. When several instruments exist, AS 20 considers them separately and sequences them from the most dilutive to the least dilutive because the order can affect the final answer.
Presentation and disclosure checks
AS 20 requires basic and diluted EPS to be presented on the face of the statement of profit and loss for each class of equity shares with different rights to share in profit, with equal prominence for all periods presented. The standard also requires disclosure of the numerators used for basic and diluted EPS and their reconciliation to net profit or loss, the weighted-average denominators and their reconciliation, and the nominal value of shares alongside the EPS figures, subject to the applicability and disclosure reliefs described in the standard.
Practical year-end EPS checklist
- Confirm the reporting framework and AS 20 applicability. Do not mix AS 20 calculations with a different reporting framework.
- Reconcile the earnings numerator. Start from the reported profit or loss and document preference-dividend and other required adjustments.
- Build a share-movement schedule. Capture opening shares, issues, buy-backs and the exact dates relevant to time weighting.
- Identify no-resource share changes. Flag bonus issues, share splits, reverse splits and the bonus element in rights issues for the required retrospective adjustment.
- List every potential equity share. Include convertible instruments, options, warrants and contingent share arrangements that could affect diluted EPS.
- Run the dilution test. Exclude anti-dilutive instruments rather than assuming every convertible instrument belongs in diluted EPS.
- Reconcile basic to diluted EPS. Keep a clear bridge for both numerator and denominator changes.
- Check presentation and disclosures. Ensure comparative restatements, reconciliations and share information agree with the final financial statements.
Common mistakes
- Using the closing number of shares instead of the weighted-average share count.
- Ignoring cumulative preference dividends merely because they were not declared during the year.
- Time-weighting a bonus issue like a normal cash issue instead of restating the share count as required.
- Forgetting the bonus element in a rights issue made below fair value.
- Adding potential shares to diluted EPS without adjusting the related earnings numerator where required.
- Including anti-dilutive convertibles or options simply because they are legally capable of becoming equity.
Practical takeaway
A sound AS 20 calculation is built from a reconciled earnings numerator, a dated share-movement schedule and a separate review of potential equity shares. Calculate basic EPS first, deal correctly with bonus, split and rights adjustments, and then test each potential equity instrument for dilution before building diluted EPS. That workflow makes the final per-share figures easier to audit, explain and reconcile to the financial statements.
