This paper presents certain investments in fixed assets investment of companies in the manufacturing industry on the example of companies in Croatia and Slovenia. In the theoretical part, it is elaborated the concept of fixed assets and determinants of fixed assets investment as well as accounting determinants of fixed assets investment and the role of depreciation and possible approaches in measuring fixed assets investment of the company. Then is presented significance of financial indicators related to their impact on additional investments in fixed assets. The manufacturing industry in Croatia and Slovenia is analyzed with a review of trends in the last five years. Subject of analysis are companies in countries that have a similar historical and economic heritage. It has been shown that Slovenia has a more developed manufacturing industry with a more significant impact on the economy and more favorable trends. A comparison of favorable external sources of financing fixed assets investment has shown that Croatia and Slovenia have similar lending programs and tenders for grants. The analysis of companies in Croatia showed that the grants enabled additional development of the companies and increased business performance and competitiveness on the market. The relationship between additional fixed assets investment and possible determinants in the form of financial indicators was analyzed using an econometric panel analysis, which concludes that the capital value, total assets efficiency, cost-effectiveness of business activities, company size, export and company indebtedness have a positive impact. The example of financial evaluation of the project in the manufacturing industry, craft beer production shows the application of economic and financial criteria, standard and advanced approaches to assess the profitability, cost-effectiveness and risk of the investment project. For the purpose od risk assessment in case of expected change of project input variables, the use of advanced evaluation approaches was proposed and presented, such as: analysis of unfavorable scenarios and calculation of standard deviation of the mean value of each criteria.