Farmers' sources of income come from farming (on-farm) and outside farming (off-farm), therefore each of these sources will determine the amount of income for the farm household. This condition may be related to the role and position of the farmer in the farmer group. Farming management by farmer group administrators is expected to be better because it will provide examples to farmer group members, besides that farmer group administrators are also motivators and dynamics in their groups in adopting new technology. This study aims to determine the farm and off-farm income, the contribution of both incomes to the total income, and the factors that affect the total income of farmer group administrators in Temanggung District. This research method uses descriptive analysis with survey techniques. Sampling of farmer groups and farmer group administrators was carried out in a simple random manner. Data were analyzed using proportion test and multiple linear regression. The results showed that most of the contributions of farming (on farm) by farmer group administrators were high. Age, education and land area had a significant effect on the total income of farmer group administrators, while the number of family members and the number of workers in the household of farmer group administrators had no significant effect on the total income of farmer group administrators.