This paper analyzes the impacts of public and private seedling donation programs on the profitability of reforestation projects carried out on small and medium size Brazilian farms. Homogeneous eucalyptus tree plantations in the Brazilian states of Minas Gerais, Sao Paulo, and Parami were used to supply our data. In these states, public and private seedling and input donation programs are conducted to stimulate tree planting. The main results of this paper are: ( a) under deterministic conditions, seedling donation increases the profitability of reforestation projects by 8.3% in the state of Parana and by 6.8% in the state of Sao Paulo; (b) donation of seedling and inputs increased reforestation profitability in the state of Minas Gerais' by 52.19% and43.88% for projects MG3 and MG4 respectively. The above results confirm the importance of seedling donation in stimulating reforestation. The paper ends by giving some suggestions to improve this type of program.