The Covid-19 pandemic and related global economic crisis triggered an unprecedented shift in public debt sustainability in the developing world. Emerging Markets (EMs) and Low-income Developing Countries (LDCs) have been hit harder by the post-Covid debt surge, reflecting their heavy debt-service burden compared to Advanced Economies (AEs). A decade ago, the share of government interest payments in fiscal revenues was nearly the same (on average around 6%) for the three country categories. Since then, the debt-service cost has fallen for AEs (to 4% in 2020), gradually increased for EMs (7.3%) and more than doubled for LDCs (13.7%). […]