This study aimed to evaluate the economic viability of organic sweetcorn production in São Luís municipality, Maranhão State, Brazil. Data were collected considering the first crop results of 2017, and then a cost spreadsheet was prepared. The revenue was determined according to the productivity achieved and the price at which the corncobs were commercialized. The economic indicators [net present value (NPV) and internal rate of return (IRR)] were calculated, taking into account the inputs and outputs of Cash Flow. A sensitivity analysis was carried out showing 15% impact on the values of production costs and on the reduction in revenue. The NPV for this project over a three- year projection was R 15,602.95(Braziliancurrency)foranattractivenessrateof25 15.602,95 para uma taxa de atratividade de 25%. A TIR ficou em 118,15%, podendo o projeto ser considerado com viabilidade financeira, tendo em vista o risco associado às atividades agropecuárias. Nas análises de sensibilidade, os componentes que tiveram maior impacto sobre os indicadores foram a redução na receita (por queda no preço ou na produtividade), com redução de 22,15% no VPL, e os gastos com fertilizantes, com redução de 12,56% na TIR
