Matching grant programs administered to agricultural groups and cooperatives have emerged as ameans of helping smallholder farmers to commercialize in Nepal. These programs help farmers toaccess information on new technologies, overcome barriers to productive investment, and connectwith output markets, although the combinations of support received by individual households vary.This study disentangles the causal effects of different elements of support through an inverseprobability weighted two-way fixed effects analysis of data from a panel of 2,268 households, of which47% belong to 246 farmer groups in three provinces. It finds that group membership without receivingsupport has important effects on commercialization and income, as does receiving any support. Theforms of support with largest effects on production, income, and/or human capital include productiontraining, marketing support, and a combination including both training and assets. In contrast, onlymodest or even negative effects are detected from provision of either inputs or credit in isolation.