The thesis deals with the principle of prudence in financial reporting. It is focused on details of its tools and discusses them from accounting and tax perspectives. In the first chapter there are described the generally accepted accounting principles followed by accounting units in the accountancy. The following chapters are primary focused on the tools of the principle of prudence particularly provisions, adjustments, depreciation and amortization and deferred tax. The individual passages are suitably complemented by exemplary examples and individual cases from practice, which are dealt with by the jurisdiction of Supreme Administrative Court in the Czech Republic.Diplomová práce se zabývá problematikou zásady opatrnosti v účetním výkazn...