How to Audit Earnings Per Share Under IAS 33

Why EPS errors survive to final sign-off

EPS sits in the financial statements as two numbers on the face of the income statement. Basic and diluted. On most non-Big 4 engagements, the client calculates EPS in a spreadsheet, the audit team recalculates it from the same inputs, both numbers agree, and the workpaper gets signed. Arithmetic isn’t the issue. Nobody tests whether the inputs are right.

What most teams miss: the weighted average number of shares is not the number of shares outstanding at year-end. It’s a time-weighted calculation under IAS 33.20, adjusted for shares issued or bought back during the period. A client that issued 500,000 new shares on 1 September and uses the year-end total as the denominator has overstated the share count for the first eight months. On a company with 4 million shares outstanding and €2.8M of profit, that error shifts basic EPS by roughly 8%.

For listed entities, EPS is one of the most scrutinised metrics in the financial statements. Analysts build models on it. Share prices move on it. The AFM reviews EPS disclosures as part of its periodic financial reporting examination programme. An error that looks mechanical in the workpaper can be material to users of the financial statements in a way that a depreciation misstatement of the same euro amount would not be.

What IAS 33 actually requires you to test

Scope: who has to report EPS

IAS 33.2 limits the scope to entities whose ordinary shares or potential ordinary shares are traded in a public market, and entities in the process of issuing such shares. If your client is a private B.V. that voluntarily discloses EPS, IAS 33.3 requires them to follow the full standard if they choose to present it. You can’t have a “simplified” EPS on the face of the income statement.

For audit purposes, confirm at planning whether IAS 33 applies. If the client is listed on Euronext Amsterdam, Euronext Growth, or any regulated market, EPS disclosure is mandatory. If the client is private but presents EPS, the full IAS 33 requirements apply.

Basic EPS under IAS 33.10

The formula is straightforward: profit or loss attributable to ordinary equity holders of the parent, divided by the weighted average number of ordinary shares outstanding during the period.

The numerator requires adjustment. IAS 33.12 specifies that you start with profit or loss attributable to the parent and deduct preference dividends (whether declared or not, if cumulative) and any other differences arising from the settlement of preference shares. If the client has preference shares with a cumulative 6% dividend and didn’t declare it this year, that dividend still reduces the basic EPS numerator. Many mid-market listed entities with preference share structures miss this because the dividend wasn’t paid and doesn’t appear in the cash flow statement.

For the denominator, IAS 33.20 requires a time-weighted calculation. Shares issued partway through the year are weighted from their issue date. Treasury shares purchased are excluded from the date of purchase. IAS 33.26 requires that bonus issues, bonus elements of rights issues, and share splits be applied retroactively to all periods presented, including the comparative. A client that completed a 2-for-1 share split in September must restate the prior year comparative EPS as if the split had occurred at the beginning of the earliest period presented.

Share buybacks create a specific trap. When the client repurchases shares during the year, those shares drop out of the weighted average from the repurchase date. But if the client holds them as treasury shares and hasn’t cancelled them, the shares still exist legally. IAS 33.20 is clear: treasury shares are excluded from the denominator regardless of cancellation.

The error shows up when the team uses the year-end outstanding count (which already excludes treasury shares) as the denominator without time-weighting the buyback. On a client that repurchased 300,000 shares on 1 April, the correct denominator weights those shares for the three months they were outstanding before repurchase. Using the year-end count understates the denominator for Q1 and overstates basic EPS.

Rights issues and the bonus element

IAS 33.26 and IAS 33.27(b) require special treatment for rights issues priced below the market price. A rights issue at a discount contains a bonus element: the difference between the theoretical ex-rights price (TERP) and the rights issue price gives you a factor that must be applied to the pre-rights share count. This adjustment applies retroactively to all prior periods presented.

On mid-market engagements, rights issues are less common than on large-cap companies, but they do occur. When they do, the bonus element calculation is almost always done wrong in the client’s spreadsheet. The error is usually in the TERP calculation itself. Confirm the market price used is the last cum-rights trading price, not the average price over the offer period.

Diluted EPS under IAS 33.31

Diluted EPS adjusts both the numerator and the denominator for the effect of all dilutive potential ordinary shares. IAS 33.33 lists the common types: convertible instruments, share options and warrants, and contingently issuable shares.

For convertible instruments, IAS 33.33 requires you to add back the after-tax interest expense (or preference dividends) to the numerator and add the shares that would be issued on conversion to the denominator.

Share options use a different method. Under the treasury stock method in IAS 33.45, you assume the options are exercised, calculate the shares that would be issued, then subtract the shares that could theoretically be bought back at the average market price with the proceeds. Only the incremental shares enter the denominator. The numerator doesn’t change because option holders receive shares, not a reduction in the client’s interest expense.

The critical test is anti-dilution under IAS 33.41. Potential ordinary shares are only included in diluted EPS if their effect is dilutive (decreases EPS or increases loss per share). If including a convertible bond would increase EPS, you exclude it. This test must be performed on each class of potential ordinary share individually, and the instruments must be ranked from most dilutive to least dilutive under IAS 33.44 before inclusion.

The anti-dilution sequence most teams get wrong

IAS 33.44 doesn’t just say “exclude anti-dilutive instruments.” It prescribes a specific ordering. You rank all potential ordinary shares by their incremental EPS effect (the change in earnings divided by the change in shares for each instrument), from lowest to highest. Then you include them one at a time, recalculating diluted EPS after each inclusion. The moment diluted EPS starts increasing (or loss per share starts decreasing), you stop. Everything from that point onward is excluded.

This sequential approach means that an instrument which is dilutive on its own can become anti-dilutive in combination with other instruments already included. A convertible bond with a low coupon might be dilutive when tested first but anti-dilutive when tested after share options that have already reduced EPS substantially. The ordering changes the answer.

Most client spreadsheets skip this. They test each instrument in isolation, include all the dilutive ones, and calculate diluted EPS in a single step. On engagements where only one type of potential ordinary share exists (say, just employee share options), the result is the same. On engagements with convertible bonds, warrants, and contingently issuable shares, the single-step approach can produce a different answer.

The difference matters. Diluted EPS is a disclosed metric that analysts build into valuation models. An incorrect ordering can misstate it by several cents per share, which on a stock trading at €20 with 8 million shares outstanding represents a market capitalisation impact that exceeds any reasonable materiality threshold.

When you encounter a client with multiple classes of potential ordinary shares, request their anti-dilution working paper separately from the main EPS spreadsheet. If they can’t produce one, build it yourself. The sequential test under IAS 33.44 typically fits on a single page and takes less than an hour to prepare from scratch.

The ciferi Financial Ratio Calculator produces working paper output for the basic EPS denominator, including the time-weighted share calculation for mid-year issuances.

Contingently issuable shares

IAS 33.52 addresses shares issuable upon the satisfaction of specified conditions. Performance-based earn-outs on acquisitions are the most common example on mid-market engagements. If the client acquired a subsidiary with an earn-out clause (issuing 200,000 additional shares if the subsidiary hits €5M EBITDA within two years), IAS 33.52 requires you to assess whether the conditions are satisfied at the reporting date.

When the conditions are met at reporting date, include the shares in both basic and diluted EPS. When conditions are not yet met but the current trajectory suggests they will be, include them in diluted EPS only. Conditions that are clearly not going to be met result in exclusion entirely. The judgment call is the middle scenario, and it needs documentation. A brief memo stating “management expects the earn-out target to be achieved based on current run-rate” is not enough. You need the financial data underlying that expectation, the earn-out’s contractual terms, and the sensitivity of the EPS impact to the probability assessment.

Disclosure requirements that reviewers check

IAS 33.66 requires basic and diluted EPS to be presented on the face of the income statement for profit or loss from continuing operations and for total profit or loss, for each class of ordinary shares. Separately, EPS for discontinued operations must be disclosed either on the face or in the notes under IAS 33.68.

IAS 33.70 is the disclosure paragraph that generates the most review comments. It requires the client to disclose the amounts used as numerators in calculating basic and diluted EPS, and a reconciliation of those amounts to profit or loss attributable to the parent. It also requires a reconciliation of the weighted average number of ordinary shares used as denominators. If the client presents a single EPS figure on the income statement with no supporting reconciliation in the notes, the disclosure is incomplete.

For clients with convertible instruments or share options, IAS 33.70(c) requires disclosure of instruments that could potentially dilute basic EPS in the future but were excluded from diluted EPS because they were anti-dilutive in the current period. This disclosure is frequently missing, and reviewers specifically look for it because it signals whether the audit team tested the anti-dilution sequence at all.

Worked example: auditing De Groot Electronics N.V.

Client: De Groot Electronics N.V., a listed electronics distributor on Euronext Amsterdam. Revenue: €127M. Profit attributable to ordinary equity holders: €6.4M. Ordinary shares outstanding: 8,000,000. Convertible bonds outstanding (issued 1 July): €10M face value, 3% coupon, convertible into 1,200,000 ordinary shares. Employee share options: 400,000 options with an exercise price of €14. Average market price during the period: €22. Tax rate: 25.8%. Performance materiality: €320K.

1. Calculate and verify basic EPS

De Groot has no preference shares, so the numerator is the full €6.4M. You verify the weighted average share count. The 8,000,000 shares were outstanding for the full year (no mid-year issuances, no buybacks). Basic EPS: €6,400,000 / 8,000,000 = €0.80.

2. Test the dilutive effect of employee share options using the treasury stock method

Under IAS 33.45, assume the 400,000 options are exercised at €14. Proceeds: €5,600,000. Shares that could be repurchased at the average market price (€22): 254,545. Incremental shares: 400,000 minus 254,545 = 145,455. No numerator adjustment for options. Incremental EPS effect: €0 / 145,455 = €0.00 (most dilutive, so this ranks first in the ordering under IAS 33.44).

3. Test the dilutive effect of the convertible bonds

The bonds were issued on 1 July, so the interest saving and share conversion are weighted for six months. After-tax interest saving: €10M × 3% × (1 minus 0.258) × 6/12 = €111,300. Additional shares on conversion (weighted for six months): 1,200,000 × 6/12 = 600,000. Incremental EPS effect: €111,300 / 600,000 = €0.19 per share.

4. Apply the anti-dilution sequence under IAS 33.44

Rank by incremental EPS: options first (€0.00), then convertible bonds (€0.19).

Step one: include options. Adjusted EPS: €6,400,000 / (8,000,000 + 145,455) = €0.786. EPS decreased from €0.80 to €0.786. Dilutive. Include.

Step two: include convertible bonds. Adjusted EPS: (€6,400,000 + €111,300) / (8,000,000 + 145,455 + 600,000) = €6,511,300 / 8,745,455 = €0.744. EPS decreased further from €0.786 to €0.744. Dilutive. Include.

Diluted EPS: €0.74.

Your EPS audit checklist

1. Confirm IAS 33 applies to the engagement. Check whether ordinary shares or potential ordinary shares are publicly traded. If the client is private but presents EPS voluntarily, the full standard applies. (IAS 33.2, IAS 33.3.)
2. Verify the weighted average ordinary share count by obtaining the share register and time-weighting all mid-year movements (issuances, buybacks, conversions). Do not accept the year-end share count as the denominator. (IAS 33.19, IAS 33.20.)
3. For any bonus issue, share split, or reverse share split during the period, confirm the client restated the comparative EPS figures and the weighted average share count for all prior periods presented. (IAS 33.26, IAS 33.28.)
4. Test the anti-dilution sequence by ranking all potential ordinary shares from most to least dilutive by incremental EPS, including them sequentially, and stopping when diluted EPS starts rising. Do not accept a single-step calculation when multiple classes of potential ordinary shares exist. (IAS 33.44.)
5. For convertible instruments, verify the numerator add-back uses the after-tax interest expense and not the pre-tax amount, and that both numerator and denominator adjustments are time-weighted from the instrument’s issue date if it was not outstanding for the full period.
6. Check the disclosure of basic and diluted EPS on the face of the income statement (IAS 33.66) and confirm the client has disclosed the amounts used as numerators and a reconciliation of the denominators (IAS 33.70). If the client presents discontinued operations, EPS for discontinued operations must be disclosed either on the face or in the notes (IAS 33.68).

Common mistakes

• Using the year-end share count instead of the weighted average: On an engagement with a significant mid-year share issuance (a rights issue, a placing, or shares issued as acquisition consideration), the difference between year-end and weighted average share count can shift EPS by 5% to 15%. The ESMA enforcement database includes multiple decisions requiring restatement of EPS for exactly this error.
• Failing to restate comparative EPS after a bonus issue or share split: IAS 33.26 is absolute: the retroactive adjustment applies to all periods presented. If the client completed a 3-for-1 split in October and the comparative year shows EPS calculated on the pre-split share count, the comparative is misstated. Reviewers check this because it’s a binary test with no judgment involved.

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Frequently asked questions

Further reading and source references

• IAS 33, Earnings Per Share: the source standard governing basic and diluted EPS calculation and disclosure requirements.
• IAS 32, Financial Instruments: Presentation: governs the classification of compound instruments that feed into the diluted EPS calculation.
• IFRS 9, Financial Instruments: relevant to the classification of convertible instruments and share options.
• ISA 540, Auditing Accounting Estimates and Related Disclosures: applies to the auditor’s assessment of EPS as an estimate involving judgment on contingently issuable shares.