The topic of this paper is financing start-ups. Start-ups are just new, young, innovative companies that are ready to respond to external stimuli and market needs, but in the line with the topic, they need the financial resources to start and start a business. There are many types of start-ups and each company goes through different stages of development from its inception to its peak. Through all these stages, the company must have clearly defined financial assets that help them in their operations. The aim of this paper is to define and explore all the financial opportunities available to start-ups. One of the sources of financing for start-ups is the European Union, which offers large financial incentives with its institutions and funds. There are also traditional and new financing methods in the Republic of Croatia, as well as the Croatian bank for reconstruction and development (HBOR), the Croatian agency for small businesses, innovations and investments (HAMAG) and the Ministry of economy, labor and entrepreneurship, which offer various programs of financing and assistance to all new and young entrepreneurs. Research on Croatian start-ups concludes that financing, whether from the European Union or from foreign investors, is the most important link in starting a start-up company.