This thesis deals with the differences between accounting and value added tax, and its aim is to clarify the problematic areas of VAT charging. Attention is focused on the distinction between the date of accounting transaction and the date of taxable supply, which is also related to the issue of foreign currencies, given that the conversion is performed on these dates. Situations in which exchange rate differences may occur are shown, especially in the case of cross-border transactions, or more precisely for import and export of goods. Furthermore, the issue of vouchers and advances is explained, where the origin of the obligation to declare tax is clarified and their accounting is stated. In addition, the charging of VAT for fixed assets i...