The study aimed to identify the impact of the lack of capacity on civil liability by explaining the concept of capacity, the concept of civil liability, the meaning of the minor and those in his capacity, the elements of tortious liability, the extent to which the minor’s liability is linked to discrimination, then the conditions for the minor’s liability for the harmful act, the extent of the responsibility of the distinguished minor and its relationship to the responsibility of the taxpayer. Under his supervision, the problem of the study was summarized in that the lack of capacity has effects, and among these effects is the lack of responsibility for actions. A boy under seven years of age is considered indiscriminate, and without discrimination, he is not qualified to exercise his civil rights, as he does not have the capacity to act, nor the capacity to manage. This research came to address those The problem is through: examining the provisions of ineligibility in the Omani Civil Transactions Law 29/2013, as well as the Saudi system as a comparative law. The researcher adopted the comparative descriptive analytical approach due to the study’s need for all of them. The study concluded with a number of research results in addition to a number of recommendations, and one of the most important results reached is It is represented in the fact that full capacity is of great importance in a person’s life. Without it, a person cannot carry out his duties or dispose of his property and money in a manner commensurate with his desires. Full capacity to perform is a condition that must be met in a person in order for him to be qualified to carry out legal duties and financial transactions, and to be qualified to conclude any A decade of various decades, and the most important recommendations were I advise researchers, scholars, and students of science to further research and continue this great project, as it has great importance in our contemporary reality, and as a way to contribute to enriching scientific research, the researcher proposes a research entitled: Legal provisions for deficient actions and their effects. Keywords: Incompetent - minor - negligent person - foolish person - sick person - death - civil liability