(1) Currently, more than forty percent of Fortune Global 500 changed from United States Generally Accepted Accounting Principles (GAAP) to International Financial Reporting Standards (IFRS); in virtually 100 countries, 12,000 corporations have opted to follow IFRS. As this standard is becoming globally accepted, the United States has been compelled to cooperate with IFRS. To portray the challenges involved, one large United States company, Clark Corporation, will be explored. At the close of the 2010 financial year, Clark Corporation’s external auditors strongly recommended that they prepare its financial statements using IFRS by January 1, 2012. However, Clark Corporation will encounter various challenges in migrating from depreciating the building under GAAP to IFRS. The component depreciation method is defined as “a method of calculating depreciation where separate items of a building with different useful lives are depreciated on different schedules” (Financial Dictionary, 2011). Although there are many benefits of the IFRS depreciation method, there are also numerous challenges that Clark Corporation will face from the gaps between current accounting practices and the new reporting system. One internal control challenge in migrating from the U.S. GAAP depreciation method to the IFRS depreciation method is the incompatibility between the systems. There are various internal controls in the U.S. GAAP reporting system that must be altered for the new reporting system, IFRS. First, the preventative controls in the U.S. GAAP system are effective to restrict the user from performing unauthorized actions but it may not be effective in the IFRS information system. For instance, due to the incompatibility between the systems, this control may block an account that is necessary to access in IFRS. Another important control to adjust is corrective controls, which identify