We measure the preparedness of listed firms for international financial reporting standards (IFRS) by changes in explanations from Australian GAAP to IFRS between the half-year and annual accounts. About one-third of sample firms changed their explanations for earnings, cashflows or equity by averages of about −7%, 67% and 3% respectively. Most changes are less than 5% for earnings and equity, and tax is the item most commonly revised. More profitable firms and firms with more reconciling items are most likely to change an explanation. In a telephone survey of chief financial officers, 70% revealed that the change followed an incorrect application of an accounting rule in the half-year accounts.