6. Basis of preparation of the financial statements
The financial statements cover the year ended 31 December 2020 and include comparative data for the year ended 31 December 2019 and additionally statement of financial position as 1 January 2019. The financial data is presented in Polish zloty (PLN) in millions, unless otherwise indicated.
These financial statements have been prepared on a fair value basis in respect of financial assets and liabilities measured at fair value through profit or loss, including derivatives and financial assets measured at fair value through other comprehensive income. The remaining financial assets are disclosed in amortized cost less allowances for expected credit losses. However the remaining financial liabilities are disclosed at amortized cost. Non-current assets are measured at acquisition cost less accumulated depreciation and impairment charges. Non-current assets (or groups of such assets) classified as held for sale are measured at the lower of their carrying amount and fair value less costs to sell.
While preparing financial statements, the Group makes certain estimates and assumptions, which have a direct influence on both the financial statements and enclosed supplementary information. The estimates and assumptions that are used by the Group in determining the value of assets and liabilities as well as revenues and costs, are made based on historical data and other factors which are available and considered appropriate in the given circumstances. Assumptions regarding the future and the available data are used for assessing the carrying amounts of assets and liabilities which cannot be clearly determined using other sources. In making estimates the Group takes into consideration the reasons and sources of the uncertainties that are anticipated at the end of the reporting period. Actual results may differ from estimates.
Estimates and assumptions made by the Group are subject to periodic reviews. Changes in estimates are recognized in the period to which they relate.