Have IFRS made a difference to intra-country financial reporting diversity?

According to the International Accounting Standards Board (IASB), International Financial Reporting Standards (IFRS) are intended to provide a common set of globally applicable accounting standards, having the ultimate aim of reducing international financial reporting diversity. Much previous research on standards harmonisation has been conducted on relatively small samples and in periods which pre-date the introduction of mandatory IFRS in the EU and Australia. Most of these studies have also relied on some form of indexing technique to measure harmonisation (such as the modified C-index) which have since been challenged in the literature. Based on a sample of 81,560 firm years, this study examines whether the mandatory IFRS regime has led to any significant reductions in overall financial reporting diversity by companies within the EU and Australia. Financial reporting diversity is proxied by the variability of several balance sheet, income statement and cash flow statement ratios measured over the pre-IFRS and post-IFRS periods. Variability is measured by the coefficient of variation (CV), a scale neutral measure of dispersion of a probability distribution. This measure avoids many of the methodological problems associated with index techniques. Notwithstanding some mixed findings, the group mean comparisons and multiple regression results indicate some statistically significant reductions in the variability of ratio measures in the post-IFRS period, even after controlling for factors such as firm size, industry and adoption status (whether a country is an IFRS adopter or not). While the results should be viewed as preliminary, they provide some tentative support for IASB's current policy direction towards global accounting standards convergence (for instance, the IASB-FASB convergence project). The results also have implications for other countries contemplating a shift to IFRS, such as the United States and several Asian nations, including Japan and India. A useful direction for future research is to determine whether the same results hold using a more extensive post-IFRS sample. (C) 2010 Elsevier Ltd. All rights reserved.