Subject and purpose of work: The article presents the complexity of the transaction costs and their impact on institutions supporting employment of the people with disabilities in Poland. As a measure of the unwanted costs, lost benefits in the form of not received public income on account of shared and used concessions, endowments, exemptions for employers of people with disabilities were assumed. Materials and methods: An example of the lost benefits was presented on the grounds of State Fund for Rehabilitation of Disabled Persons and the Ministry of Family, Labour and Social Policy data. In the article, the method of description and financial analysis was applied. Results: All forms of public aid, being the support of employers of people with disabilities, require legislative actions, additional work of administration bodies, monitoring, PFRON (State Fund for Rehabilitation of Disabled Persons), levies collection system adjustments (thus a tax system), which constitute the total coordination costs of the chosen economic policy, that is transaction costs. Conclusions: The analysis carried out indicates on the one hand the complexity of the institutional solutions for supporting the employment of people with disabilities, what provokes thoughts about the need to rationalize the institution of grants for entrepreneurs, labour law and occupational rehabilitation, on the other hand the sensitivity of the system supporting employment institutions to changes which occur in other institutions and in the environment.