This side event will explore how international taxation can advance the next decade of climate action, directly supporting Belém+10 by strengthening multilateralism and opening new spaces for implementation. The panel brings together CSO practitioners, government representatives, subnational actors, and legal experts to provide comprehensive perspectives on climate-related opportunities and challenges in the ongoing UN Tax Convention negotiations. The Convention is not exclusively about developing tax rules and rethinking future tax cooperation—it can also establish legally binding mechanisms to enforce the polluter pays principle, curb tax abuses, and ensure that high emitters and ultra-wealthy actors contribute fairly, mobilizing public resources for low-carbon, climate-resilient economies. This mix of panelists ensures a 360° understanding of procedural dynamics—including negotiation timelines and opportunities for climate justice actors to provide input—while proposing concrete tax instruments and financing solutions, from ultra-high net worth taxes to solidarity levies. By linking fiscal innovation to the Paris Agreement, the discussion shows how taxation can rechannel financial flows toward low-emission, climate-resilient pathways, and unlock new and additional financial streams for climate finance.