The period label is part of the metric
The latest financial year is not always the latest twelve months. With compatible interim data, trailing-year earnings equal the last full year plus the new interim period minus the corresponding prior-year interim period. Adding a full year and fresh half-year data without removing overlap creates 18 months disguised as one year.
The earnings formula does not transfer automatically to EPS when share count changes, splits occur or adjustments differ. IAS 33 requires weighted shares and rules for basic and diluted EPS. Reconstruct comparable earnings and share count first, then check published EPS and notes.[79](#source-term-ias33)
One price, several ratios
In a simplified model share count is constant. Annual EPS is 8 roubles; new half-year EPS is 6; corresponding old half-year EPS is 3. Trailing EPS is 11. At a price of 120, trailing completed-year P/E is 15 and trailing-year P/E is approximately 10.91.
If next year’s forecast EPS is 12, forward P/E is 10. If 2 of trailing 11 relate to an event excluded by the method, normalized EPS is 9 and the ratio about 13.33. All four figures use one price but are not interchangeable facts.
What counts as unusual
Each adjustment needs a reason, amount, tax effect and impact on the relevant earnings share. A “one-off” restructuring recurring every year may be ordinary economics. Do not remove an inconvenient expense while retaining a similar positive effect. Keep reported earnings beside the analytical version. For a cyclical business, normalization may require average utilization and price, not merely deleting one line.
Forecasts are not promises
Save the date, author and assumptions of forecast EPS. Check expected share count, interest expense and growth financing. A new share issue can make total earnings rise without producing the same rise in EPS. An analyst range is not an objective probability boundary. Compare like periods and bases; numerator and denominator must be consistent.[96](#source-cv-pricing)
Weighted shares and dilution
Basic EPS uses profit attributable to ordinary owners of the parent and the weighted-average ordinary shares outstanding during the same period. A cash issue enters from its participation date and a buyback reduces the outstanding amount; splits and certain bonus issues have retrospective adjustments. Source: ga-ias33-text, paragraphs 10, 19–21, 26–29 and 64. Ending shares at 31 December are not automatically the annual denominator.
With 1,000 shares before July 1, a cash issue adds 400 from that date, and 200 are repurchased from October 1, the equal-month approximation gives 1,000 × 6/12 + 1,400 × 3/12 + 1,200 × 3/12 = 1,150 weighted shares. Year-end shares are 1,200. With profit of 2,300, basic EPS is 2; dividing by 1,200 gives 1.9167 and distorts the time basis.
A convertible bond adds 300 shares under an assumed beginning-of-year conversion. Interest expense of 120 reduced original profit of 2,300; assumed tax effect is 24. Add back post-tax interest of 96 and add 300 shares: diluted EPS = (2,300 + 96)/(1,150 + 300) = 2,396/1,450 ≈ 1.6524. Increasing only the denominator gives 2,300/1,450 ≈ 1.5862, an incorrect bridge. IAS 33’s if-converted paragraphs 31–36 apply to this potential-effect calculation; they do not assert that an issue actually occurred.
A different instrument adds 100 shares and 300 after-tax earnings. (2,300 + 300)/(1,150 + 100) = 2.08, above basic EPS 2, so it is anti-dilutive and excluded in this simple case. IAS 33 requires instruments to be considered in order using continuing-operations profit attributable to ordinary owners as the control base.[ga-ias33-text, 41–44]
Keep the owner’s share visible
Build earnings forecasts together with share-count forecasts. Employee options, convertible claims and planned issues can change earnings per share. Do not include every potential share without checking rules and conditions: published diluted EPS has a method, while a future-issue scenario is a separate calculation. Record earnings, owners’ share, share count and period in the reconciliation. If one changes, check the others.