Inclusive of cash crop in crop production system a small and marginal farmer is an important state to shift them from sustainable farming to an economical farming. Lac is a cash crop while Cajanus cajan is a popular pulse crop in India. The present attempt was to evaluate economics of lac and grain production on C. cajan indifferent plant densities and soil moisture conditions. The two year data revealed that the highest net returnRs. 125.21 per plant, Rs. 149749.08 per hectare, in (S2W3) medium plant density (S2) and higher level of irrigation (W3), also highest input-output ratio (2.95) and B:C ratio (1.95).