Bilateral aid to Africa fell by nearly a quarter in 2025, the largest annual decline in the history of official development assistance. Meanwhile, sovereign debt interest payments now consume on average 27% of government revenues across the continent, up from 19% in 2019. The pressure to fund development from within has never been greater. But meeting it requires African governments to understand their own economies with precision: which tax policies work, which incentives serve their purpose, how fiscal decisions distribute their consequences. Administrative tax data, the anonymised filings, returns and transaction records generated through the tax system that African revenue…