130 Countries Agree to Biden-Backed 15% Global Minimum Tax International tax reform would make multinational companies pay a "fair share of tax wherever they operate." Ireland one of nine holdouts who refuse to sign. Image Credit: Email Following weeks of intense talks involving diplomats from more than 130 countries and jurisdictions, Washington has succeeded in winning international backing for a new global minimum corporate tax framework that, if implemented, would constitute the biggest shakeup in international tax rules in a century. The world took a critical step toward implementing the deal, which involves implementing an international minimum corporate tax rate in exchange for the US sharing the tax spoils from hundreds of the biggest American multinationals. The plan is a critical piece of Biden’s “Build Back Better” strategy, which involves passing trillions of dollars in “infrastructure” spending that will be partially offset by the biggest tax hikes in decades.