It begins with a letter from a foreign tax authority, an urgent email from your regional finance director, or perhaps a passing comment at a tax conference. If you’re a financial executive at a U.S. multinational company, you’ve likely encountered these early warning signs about the wave of e-invoicing mandates sweeping across the globe. What may have seemed like isolated regulatory experiments limited to certain regions has rapidly transformed into a fundamental shift in how governments worldwide monitor, collect, and enforce tax compliance.