Evidence demonstrates how rights-based family planning (FP) brings transformational benefits to women, families, communities and countries. Investing in FP is not only a human rights issue, but also a key catalytic factor for countries to achieve the Sustainable Development Goals (SDGs). Sustainable and equitable access to FP has a tremendous socioeconomic impact and boosts synergistic efforts to reduce poverty, achieve food security and improved nutrition, save lives and improve health and well-being, improve women’s and girls’ education, advance gender equality and empowerment, mitigate the effects of access to water and sanitation, reduce the impact on health of climate change, and contribute to economic growth and social inclusion. Nevertheless, while the benefits are realized across many other sectors, the burden of financing for FP is born predominantly by the health sector. Although there have been several attempts to integrate FP into other sectors’ initiatives, the results have not yet been fully systematized or scaled up. This open letter calls for a new approach to broaden the attention of different sectors to invest in FP as a catalytic intervention to achieve the SDGs. Using the UNFPA Conceptual Framework for Sustainable Financing for Family Planning, we will highlight elements to be considered by development actors in shaping national, regional and global actions. By exploring new funding sources and mechanisms to increase investments in FP, maximizing efficiency, and overall, revamping FP beyond the health sector, we intend to expand the reach of the discussions across non-traditional actors, underscoring the need to increase efforts towards guaranteeing universal health access for all as a main contributor to achieve the 2030 agenda. Further, we will detail experiences of how UNFPA and development partners have incorporated innovative approaches to secure sustainable financing for FP at the national level providing concrete examples on how to proceed in this area.