This study analyzes the differences in the amount of major accounts on the financial statements prepared by the Korean International Financial Reporting Standards (K-IFRS) and those by the K-GAAP, as the Korean financial accounting standards were changed to the K-IFRS. For analysis, this study compares the major accounts amount in 2007 or 2008 made pursuant to the K-IFRS and that in 2007 and 2008 made pursuant to the K-GAAP of the twelve companies which adopted the K-IFRS in 2009. The analysis shows that total assets and total liabilities were increased but total stockholder’s equity were decreased on the balance sheets when the K-IFRS were applied than when K- GAAP were applied. In addition, sales, gross profit and operating income were increased but income and loss before income taxes and net income were decreased on the income statements when the K-IFRS were applied than when the K-GAAP were applied. But the differences were statistically insignificant in any case. This suggests that there might be no real differences between two accounting standards. This study helps accounting information users make reasonable decision using accounting information under K-IFRS by showing that adoption of the K-IFRS does not change the major accounts amount on the financial statements. In addition, since this study shows that change of accounting standards might not bring significant differences, this study would be useful for empirical research which uses the results of previous studies in accounting.