Indashyikirwa is an intimate partner violence (IPV) prevention program being implemented by CARE International Rwanda, Rwanda Women's Network and Rwanda Men's Resource Centre in rural Rwanda. One critical aspect of the programme is a 5-month curriculum to promote equitable, violence free relationships among formally and informally married heterosexual couples. This paper compliments existing evidence in Rwanda around how formality of marital status influences women's access to rights, social status,, risk and protective factors for IPV, and highlights barriers to formalizing marriage, primarily poverty and gendered inequalities. It draws on research of Indashyikirwa including interviews with 15 male and 15 female partners of formally and informally married couples, 9 community leaders, 3 women's space facilitators, 9 staff members, 12 community activists and 24 focus groups with community members. Interviews and focus groups were conducted in Kinyarwanda, transcribed and translated into English, and analyzed thematically. The findings indicate the poor legal protection and related limited institutional responses for informally married women who experience IPV. An intersectional lens supports recommendations to address such inequalities including to raise awareness among women in informal marriages about strategies to ensure rights for themselves and their children, and to legally acknowledge informal unions after a certain period of cohabitation.