Clarifying whether and how the Paris Agreement’s transparency framework covers financial support mobilised would be helpful when preparing modalities, procedures and guidelines. Nevertheless, both developed and developing countries face significant challenges in resolving the remaining gaps, particularly to be able to report in a consistent and transparent way on climate finance mobilised, climate finance received, and indicative future levels of climate finance. These challenges can be political and economic (e.g. if moving from single-year to multi-year budgets), and can also have significant resource and institutional implications (e.g. to expand the scope or frequency of data collection).