Abstract:
The objectives of this thesis are to study and understand the principles of computation of tax related to foreign currency transactions in accordance with the provisions of the Revenue Code, Accounting Standards and Thai Financial Reporting Standards in order to recognize the problems related to valuation on computation of corporate income tax in foreign currency transactions. After that to study the principles of law, rules and guidelines about valuation on computation for such transactions abroad about taxation and accounting and finance to propose guidelines for revision of laws, announcements or other related orders. The process of studying is by researching from documents with descriptive and analytical methods and from the description book, article in the book, journal papers, Revenue Code, including related electronic information. After that gathering in a systematic manner by comparing with some principles of the United States, and analyzing for obvious conclusions or suggestions. According to the studies, it has been found that the Revenue Code, Section 65 and Section 65 bis (5) has no principle for computation of profit and loss from valuation on foreign exchange transactions for corporate income tax. In other words, the principle for computation of profit and loss from valuation on foreign exchange according to the Revenue Code is ambiguous. And it leads to the problems in computation of tax in two ways: Firstly, the problems in recognition of profit and loss in computation of corporate income tax in transactions related to derivatives contracts and borrowing transactions. Therefore, there should have the principle for the valuation on foreign currency transactions by clearly specifying the type of transactions about what transactions are transactions that must to be valuated and to be recognized on computation of corporate income tax, along with determining different valuation methods regarding characteristics and underlying assets of its transaction importantly to comply with the principles of fairness and the principles of consistency in computation of tax.