In the current conditions of uncertainty and financial instability against the background of the coronavirus pandemic, small and medium-sized businesses are the most vulnerable. Entrepreneurs suffer huge losses, and the viability of many small businesses tends to zero due to the lack of internal reserves and unaffordable financial losses. The issue of state support for small and medium-size businesses, preferential lending and a number of other government measures aimed at supporting entrepreneurs in all affected areas remains acute. At the same time, the development (revision, reevaluation, re-orientation) of the internal functioning of small and medium-sized businesses, the implementation of competent management decisions that can support the enterprise in crisis conditions, becomes important. The purpose of implementing internal control in small and medium-size businesses is to avoid abrupt, disjointed, contradictory management decisions. The task of internal control is to ensure the consistency and expediency of management actions. Thus, the issues of organizing internal control ofvarious economic life aspects for small and medium-size businesses are becoming relevant. The paper explains the need to implement an internal control system in difficult economic conditions in order to stabilize the financial position of an enterprise. The authors have studied some factors that hamper the implementation of the internal control system in small and medium-size businesses.