国际货币基金组织：2025年逆向法：一种间接的增值税合规缺口估算技术报告（英文版）

This technical note presents the Reverse Method, a novel indirect approach for estimating the global value-added tax (VAT) compliance gap. The Reverse Method leverages public datasets and a calibrated econometric model to produce scalable, comparable, and indicative VAT gap estimates for over 100 countries and multiple years. It builds on the IMF’s RA-GAP (Revenue Administration Gap Analysis Program) framework, using C-efficiency, tax expenditure data, and national accounts to approximate the