The present state of the financial market in Ukraine determines a lack of funding for agricultural enterprises. The research aims to find internal sources of funding for the reproduction of fixed assets for agricultural enterprises. The calculation of the depreciation return index is a component of financial analysis of the efficient renovation investment use. It allows controlling its targeting and influence on enterprises in a financial aspect in order to provide a stable position of the enterprise`s investor. Implementation of economic and mathematical modeling using correlation and regression analysis verified a tight correlation between gross profit margins in agriculture and depreciation returns. For this purpose, general indexes were formed that is the primary value of fixed assets at the end of the year; the extent of their depreciation, depreciation and residual value of fixed assets at the end of the year, the average annual value of fixed assets, annual income, investment return and calculated gross profit and depreciation during 2001-2016 were determined. The results of the calculations showed that the funds saved through depreciation (renovation investments), and retained earnings are the financial resources for continuous renovation of fixed assets of agricultural enterprises. Also, attraction to internal reserves should have an impact on the increase of the agricultural enterprises' profitability and should facilitate the increase of production volumes due to the implementation of innovations.