Purpose:themainpurposeofthearticleistoinvestigatemodernproblemsoftheinstitutionofbankruptcyandtheimpactofitsresultsonthesystemofeconomicsecurityofthestate,todeveloprecommendationsforimprovingtheinstitutionofbankruptcyandtheconceptofsubsidiaryliability.Toachievethegoal,thefollowingproblemsaresolvedinthearticle:thedefinitionoftheoreticalandpracticalaspects,thegeneralizationofprocessesfortheformationanddevelopmentoftheconceptofsubsidiaryliabilityofanunscrupulouscontrollingthedebtor’spersons;theanalysisofpracticalproblemsofrealizationoftheconceptofsubsidiaryresponsibilityofanunscrupulouscontrollingthedebtor’spersons;astudyoftheRussianandforeignpracticeofimplementingtheinstitutionofbankruptcyandsubsidiaryliabilityunscrupulouscontrollingthedebtor’spersons;theformationofproposalsonthedevelopmentoftheconceptofsubsidiaryliabilityofanunscrupulousdebtorcontrollingthedebtorasatooltoincreasetheeficiencyoftheinstitutionofbankruptcyandensureeconomicsecurity.Methods:methodsthearticleisbasedonasystematicapproachtothedefinitionandformationoftheconceptofsubsidiaryresponsibility,theoretical,economicandfunctionalanalysisofthecomplexinteractionofthemainparticipantsoftheinstitutionofbankruptcyandtheimpactoftheiractivitiesontheeconomicsecurityofthecountry.Results:theincreaseinthenumberofillegalactionsinbankruptcycasesledtotheneedinthelastdecadetostrengthentheeconomic(subsidiary)responsibilityofthedebtorcontrollingthedebtor.Theauthorsummarizesthetheoreticalandpracticalaspectsofregulatingthesubsidiaryresponsibilityofanunscrupulouscontrollingdebtorforimproperactionsinthebankruptcyofthedebtorintheconceptofsubsidiaryliability.Thestudyshowedthattheformedconceptofsubsidiaryliabilityandthenewrulesadoptedin2017forthesubsidiaryliabilityofthedebtorcontrollingpersonssignificantlyincreasedtheriskofbringingtoaccountthosewhousetheschemetoterminatethecompanywithoutgoingthroughaformalbankruptcyprocedure.However,theeffectivenessofthesemeasuresremainsinsuficient,therearegapsintheimplementationoftheconcept.IntheworkonthebasisofpracticalexperienceoftheapplicationoftheconceptofsubsidiaryresponsibilityinRussiaandforeignexperience,proposalshavebeenmadetoimprovetheconcept,theirimplementationalongwithotherproposalsforthemodernizationoftheinstitutionofbankruptcywillincreasetheeficiencyoftheinstitutionofbankruptcyandpreventemergingcrisisphenomenaintheeconomy,stabilizethefinancialsituationofbusinessentitiesandensuretheeconomicsecurityofthecountry.Conclusionsandrelevance:theconductedresearchshowstheimportanceoftheconceptofsubsidiaryliabilityinensuringtheeffectivenessoftheinstitutionofbankruptcyandeconomicsecurityofthecountry.Theconductedanalysisofforeignpracticeconfirmstheneedtoregulatetheinstitutionofbankruptcyofeconomicandlegalresponsibilityofthecontrollingdebtorforbringingthedebtortobankruptcyandwrongfulactionsinbankruptcy.Theproposeddirectionsforimprovingtheconceptofsubsidiaryliabilityprovideanopportunityforitsdevelopment,intermsofincreasingtheresponsibilityofpersonsinvolvedinthebankruptcycase,forimproperactsinbankruptcy.