Share-Based Compensation
The cost of equity-settled transactions with employees is measured by reference to the fair value of the equity instruments on the date at which the equity instruments are granted and is recognized as an expense over the vesting period, which ends on the date on which the relevant employees become fully entitled to the award. Fair value is determined by using an appropriate valuation model. At each reporting date before vesting, the cumulative expense is calculated, representing the extent to which the vesting period has expired and management’s best estimate of the achievement or otherwise of non-market conditions and the number of equity instruments that will ultimately vest. The movement in cumulative expense since the previous reporting date is recognized in profit or loss, with a corresponding amount in equity.
When the terms of an equity-settled award are modified or a new award is designated as replacing a cancelled or settled award, the cost based on the original award terms continues to be recognized over the original vesting period. In addition, an expense is recognized over the remainder of the new vesting period for the incremental fair value of any modification, based on the difference between the fair value of the original award and the fair value of the modified award, both as measured on the date of the modification. No reduction is recognized if this difference is negative. When an equity-settled award is cancelled other than by forfeiture when the vesting conditions are not satisfied, it is treated as if it had vested on the date of cancellation and any cost not yet recognized in profit or loss for the award is expensed immediately.
Share-based compensation expenses are included in selling, general and administrative expenses. When stock options are exercised, the exercise price proceeds together with the amount initially recorded in contributed surplus are credited to capital stock.
