A diluted EPS calculation misses a dilutive instrument because the method isn't a single formula applied once — it requires testing each potential equity instrument (convertible debentures, employee stock options, warrants, convertible preference shares) individually to see whether including it actually decreases EPS or increases a loss per share, and ranking them from most to least dilutive before combining. Skip that per-instrument test, or apply the shortcut of treating all convertibles as automatically dilutive without checking, and an instrument that should have been included — or one that shouldn't have been — slips through.
The specific places this goes wrong
- Employee stock options are included using their full count instead of the treasury stock method, which only treats the portion not "paid for" by assumed proceeds as dilutive.
- An anti-dilutive instrument (one that would increase EPS or decrease loss per share if included) is still added in, when it should be excluded from that period's diluted EPS entirely.
- Instruments are tested in combination rather than individually ranked by dilutive effect, which can produce a different — and wrong — diluted EPS than testing and ranking them one at a time.
- A convertible instrument issued or modified mid-year is weighted for the full year instead of the period it was actually outstanding in convertible form.
- Contingently issuable shares are included even though the contingency hasn't yet been satisfied as of the period end.
A diluted EPS figure that's lower than basic EPS looks directionally correct and can pass a cursory review even when the wrong instruments drove that result — the only way to know the right instruments were included, in the right amounts, is tracing the computation instrument by instrument, not checking that diluted EPS is simply lower than basic.
Why this matters beyond the number itself
EPS is one of the few figures investors and analysts compute independently and compare directly across periods and companies — a diluted EPS that's wrong because an instrument was mishandled is also one of the more visible errors a user of the financial statements can actually catch. Testing each instrument's dilutive effect separately, every period, rather than reusing last year's treatment, is what prevents it.
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 33: earnings per share, basic and dilutedThe share count used in the EPS calculation is a weighted average across the year, not the number of shares outstanding on the last day — a detail that changes the result whenever shares were issued mid-year.
- Revenue, receivables & cut-offInd AS 109: financial instruments and the expected credit loss modelThe old model waited for a loss to be incurred before providing for it. ECL is built the opposite way — provide for the loss you expect, before it happens.
- Payroll & employee costAuditing bonus and incentive paymentsPayment of Bonus Act basics, provision-versus-actual testing, approval evidence for discretionary schemes, and accrual cut-off — the audit approach to bonus and incentive payments.
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