Intrahousehold models assume that plots farmed by women are as productive as plots farmed by men within the same household. Using a large plot-level dataset on rice farming households in India, we find evidence of significant Pareto inefficiency: women's plots produce lower yields compared to their spouse's plots, conditional on crop, plot and other attributes. The inefficiency is larger in the left tail of the rice yield distribution and primarily attributed to child-care burdens and social-norms faced by women.