As in other countries, Poland has a system of counteracting the financing of terrorism. It includes: legal regulations, institutions, operational and reconnaissance activities, information and investigative activities. Financing terrorism is primarily fundraising and transferring funds. Transfers are often made through commercial entities, they are the keepers of information. Therefore, they were obliged to monitor and report those that may be related to terrorist financing to specialized state financial intelligence units. In Poland, the function of the financial intelligence unit is performed by the General Inspector of Financial Information (as an authority) together with the Financial Information Department of the Ministry of Finance that is subordinate to him. The Polish Financial Intelligence Unit is of an administrative nature. It does not have the authority to conduct operational reconnaissance or investigative activities. It counteracts the financing of terrorism, primarily by managing the flow of information on suspicious transactions and preventive actions. This study is devoted to these issues at the level of the FIU's activity. It mainly contains an analysis of the information flow process from the obligated institutions to the GIFI and from the GIFI to the prosecutor's office and relevant services. The competences of the GIFI are shown with the indication of relevant instruments that allow to actively hinder the financing of terrorism.