The foundation of the entire social security system lies in its organizational and legal forms (methods) of implementation. The defining characteristics of each form are identified through analysis of the features that demonstrate their specific nature. The most significant features that make it possible to classify a particular type of social security under a specific organizational method are determined according to the sources of funding and the grounds for provision, considered exclusively in combination. At the federal level, social security is implemented through three primary forms: state social security, state social assistance, and mandatory social insurance. Any member of society may qualify for support measures within the framework of state social security, provided they meet the need-based criteria established by the government (low income, child-rearing expenses, health status, unemployment, etc.). State social security is aimed at maintaining a decent standard of living for certain categories of individuals who have earned or merited this right (military personnel, cosmonauts, Heroes of the USSR and Russia, among others), as well as providing compensation for harm caused by adverse consequences of radiation and technological disasters. The third form makes it possible to provide social security coverage to insured persons at the expense of mandatory social insurance funds.