The financial statements of the company are the most important source of information on its financial condition. Year-over-year changing of financial indicators is used to calculate market value, solvency, profitability and others key figures. The authors prove the importance of understanding the accounting method for the correct interpretation of financial statements. Presented calculations confirm significant income changes of Russian developers connected not with the operational successes of the company, but with a change in the accounting method when transition to IFRS 15. In order not to mislead the interested user making decisions by using the financial statements, it is necessary for companies’ management to show the effects of the transition to new standards in the clear way.