IntroductionTo promote low-carbon development, green social and economic transformation, and the early realization of “carbon peaking and carbon neutrality“, fiscal and financial synergy is urgently required.MethodsBased on the panel data of Chinese provinces from 2006 to 2024, an empirical analysis was conducted on the impact of fiscal and financial synergy on regional carbon emissions.ResultsThe benchmark regression results show that the fiscal and financial synergy has significantly reduced r