The main objective of this thesis is to examine in detail the area of exchange differences in accordance to czech generally accepted accounting principles, in accordance with International Financial Reporting Standards IFRS/IAS and in accordance with Generally Accepted Accounting Principles US GAAP. Initially, the thesis describes the general definition of foreign currency accounts. Then follows the accounting of exchange differences according to czech accepted accounting principles, including the choice of exchange rate specified for the translation of foreign currency statements. The other part of this thesis is focused on exchange differences in accordance with IFRS. Very close accounting approach is US GAAP, whose view of exchange differences describes another part. Finally, I deal with comparing all three accounting systems with emphasis on their differences in exchange differences.