Nowadays, the main area of accounting is balance sheet valuation, which has an important influence on financial situation of a company. In thesis there are presented theoretical basis of assets and liabilities valuation. There are compared the valuation methods prescribed by the International Financial Reporting Standards/ International Standards on Auditing and the Polish Accounting Act. Based on the case study of the construction company ABM SOLID S.A. the major differences between both regulations were shown. In thesis there is described also process of harmonization and standardization of the accounting and its impact on the trends in Polish regulation of balance sheet valuation.Obecnie głównym obszarem zainteresowań rachunkowości jest ...