The optimum requirement of working capital for the adoption of a rational cropping pattern is estimated, using the modified simplex method to develop optimum plans for small, medium and large farms in the Indian Punjab. Secondary data relating to a sample of 50 farmers for the period 1971-1975 are used. The requirement of working capital increased with an increase in farm size and decreased from zone I to zone III. The small farmers in zone I were unable to acquire the necessary working capital to optimize their farm plans. The need is emphasized for making credit and other farm inputs available to small farmers.