Ind AS 33 requires basic earnings per share to be computed as profit attributable to equity shareholders divided by the weighted average number of equity shares outstanding during the period — weighted by the portion of the period each tranche of shares was actually outstanding, not simply the share count at the year end. Diluted EPS starts from that same base and adjusts both the numerator and denominator for the effect of all dilutive potential equity shares — convertible instruments, options, warrants — that would, if converted, increase the share count and reduce EPS.
Why weighted average, not year-end count
A company with 100 lakh shares outstanding for nine months of the year, followed by a rights issue bringing the total to 150 lakh shares for the remaining three months, has a weighted average of (100 × 9 + 150 × 3) ÷ 12 ≈ 112.5 lakh shares for the year — not 150 lakh. Using the year-end figure instead of the weighted average overstates the share count for the portion of the year the additional shares weren't actually outstanding, and understates EPS as a result.
What makes a potential equity share dilutive, specifically
- 01Compute EPS as if the instrument had been convertedFor each category of potential equity share (options, convertible debentures, warrants), compute the EPS effect of assuming conversion at the start of the period, or issue date if later.
- 02Compare the result to basic EPSOnly instruments that DECREASE EPS or increase the loss per share when assumed converted are dilutive. An instrument that would actually increase EPS if converted is antidilutive and must be excluded, not included, from the diluted calculation.
- 03Rank instruments from most dilutive to least, where there are severalAnd include them in that order, because the antidilutive test has to be applied progressively — an instrument that's dilutive on its own might become antidilutive once combined with others already included.
Including an antidilutive instrument in the diluted EPS calculation — one that would actually increase EPS if converted — understates the dilutive effect being reported and misstates diluted EPS, even though the arithmetic of including it might look unremarkable on its own.
Common practice, not a requirement
Both basic and diluted EPS have to be presented with equal prominence on the face of the statement of profit and loss for every period presented, including for discontinued operations separately where applicable — a disclosure completeness point worth checking independently of the calculation itself.
This is practical guidance written for audit teams, not an authoritative statement of any standard or statute. Standards, forms and timelines change. Check the current text issued by the ICAI and the relevant authority before relying on anything here in an audit file.
Related resources
- Audit documentationInd AS 1: presentation of financial statements, and what a complete set actually requiresFour statements plus notes isn't optional structure — Ind AS 1 defines exactly what counts as a complete set, and a financial statement missing one piece isn't compliant regardless of how good the other three look.
- Audit data & extractsTrial balance mapping for audit softwareMapping a client's idiosyncratic ledgers to a standard chart of accounts is the step that decides whether analytics and disclosures work at all, and the one most firms rush.
- CARO & Companies ActSecretarial compliance checklist for a statutory auditorBoard meeting frequency, statutory registers and ROC filing timeliness, read as evidence of compliance culture rather than a secretarial checklist in its own right.
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