Background We developed, and pilot tested a family focused intervention Sammanit Jeevan "Living with Dignity" to reduce gender-based violence by husbands, change harmful social and gender norms and improve the economic conditions of women through young married women-led income generating activities (IGAs). Methods We conducted a modified interrupted time series study and qualitative research to evaluate the intervention in two migrant communities in Baglung district, Nepal. We enrolled young married women, their husbands and in-laws from 100 families. 200 women and 157 men completed questionnaires before the programme, and 6, 12 and 18 months afterwards. 18 in-depth interviews were conducted before the programme and 6 and 12 months later. We analysed the data for trends. Results The intervention positively impacted young married women's economic conditions, exposure to violence and changed inequitable gender attitudes. Some positive outcomes were observed among older women and men. Young women's past month earnings (35.0%-81.3%, β = 0.11, p-value<0.001) and savings (29.0%-80.2%, β = 0.14, p-value<0.001) more than doubled over time. Young women experienced much less past year physical IPV over time (10%-4.4%, β =-0.08, p-value = 0.077). They also perceived that their mothersin-law were less cruel (mean 9.0-8.6, β =-0.03, p-value = 0.035). Improvements were observed in young women's individual (mean 44.4-43.3, β =-0.04, p-value = 0.297) and