Using SFAS 123 disclosures, Botosan and Plumlee [Botosan, C., & Plumlee, M. (2001). Stock option expense: The sword of Damocles Revealed. Accounting Horizons, 15, 311–327] find that if stock-based compensation were to be expensed rather than not recognised on the face of financial statements, the impact on key measures used to assess the performance of the fastest growing US firms would be material. Street and Cereola [Street, D. L., & Cereola, S. (2004). Stock option compensation: impact of expense recognition on performance indicators of non-domestic companies listed in the U.S. Journal of International Accounting, Auditing and Taxation, 13, 21–37] subsequently also use SFAS 123 disclosures to determine that the average impact of expensing stock-based compensation on diluted EPS for non-US domiciled firms listed on US exchanges will be material and approximately 40%. In this paper, we examine whether these findings apply across international borders to firms that are required from 2005 to adopt IFRS 2 Share-Based Payment to expense stock-based payments, and across a broad range of industries and firms’ growth phases. Based on Australian Stock Exchange-listed firms’ 2002 stock-based compensation disclosures of the value of options granted to directors and the top 5 executives, the expensing of options will have a significant negative effect on approximately 20% of our sample firms’ financial performance ratios. It appears that the materiality of the impact is neither industry specific nor restricted to high growth firms. As the IFRS 2 expensing requirement extends to stock-based compensation issued to all employees, our findings are conservative estimates of the impact. The findings suggest that a stock-based compensation accounting policy change will affect recognised financial numbers and could have consequential ramifications for contractual specifications and valuations of firms across a range of industries and growth phases. Our sample of Australian firms provides an interesting context for the study, since these firms have neither traditionally expensed nor necessarily disclosed stock-based payments but from 2005, all stock-exchange listed Australian firms will be at the forefront of IFRS 2 adoption.