This article discusses one of the methods of Islamic financing – istisna, which is one of the methods of financing financial institutions, and also reveals its essence. The features and specificity of istisna, as a method of financing based on the principles of Islamic economics, are considered. The features of accounting for istisna as a financial instrument, as well as its advantages and disadvantages compared to other financial instruments, in particular, salam, are covered. It also sets out the legal basis and procedures for applying this instrument. The forms of payment in istisna and the sequence of transactions using this instrument are consistently analyzed. Also analyzes the main similarities and differences of the istisna instrument with financial instruments offered by traditional financial institutions. The article concludes with conclusions about the benefits of using the istisna tool.