The subject of the diploma thesis is a management claim system. The aim of this work is surveying methods works with claims and giving well-arranged and integrated/coherent view of possibilities their assurance from points of law, accounting and tax, solutions of problem minimization bad debts/uncollectible accounts, of issue of the claim´s delimitations duties and responsibility. The theoretical part of the diploma thesis has been occupied of common delimitation of claims, it means their characteristics, the rise and the valuation, classification, accounting record and inventory; the claims after time-limit, the possibilities claims assurance, the items of correction, the claim´s depreciation and their cede. The practical part of my diploma thesis is made in the Oknoplastic company Příbram. The introduction of the practical part is intented on a characterization of this company, next sections are devoted to the analysis particual claims group, which are filling by company, to their assurance, items of correction and depreciations. The practical part is finished by proposal to improve system of claims management in the Oknoplastic company s.r.o.