The classification of the causes of the shadow economy according to four basic separation criteria is given: by content, by origin, by scale of influence, by duration. The shadow economy is considered as a complex and multifaceted phenomenon that exists in any socio-political conditions and poses a threat to the country's national security. The main reasons for the emergence and spread of the phenomenon of the shadow economy as a threat to national security are characterized, in particular, economic (level of tax burden and tax administration; excessive state intervention in the economy; crisis phenomena in the economy and the financial sector), social (low standard of living of the population; high level of unemployment; social differentiation and stratification of society), institutional and legal (imperfection of the institutional environment; imperfection and instability of the legislative framework; insecurity of property rights and incapacity of the judicial system); state (corruption of public services of various power structures; bureaucratic arbitrariness and bribery), political (socio-political instability; improper performance of the state's functions), psychological and ethical. It was established that the determinants of shadowing of the economy are closely related and mutually dependent. It is substantiated that only the state policy of detinization will be effective, which will comprehensively combine the solution of the main problems of the state in terms of economic, social, institutional and legal, state, political, psychological and ethical components of the determinants of the detinization of the economy. The objective width of the dispersion of the causes of the shadow economy has been established, which allows to fix the structural complexity of the object and, thereby, to take into account the diversity of its manifestations as much as possible for the implementation of an effective policy of detinization of the economy in the context of ensuring the national security of Ukraine.