Experts are concerned that President Joe Biden’s new global minimum tax rate of 15 percent on large multinational business will harm the small businesses that support them. Treasury Secretary Janet Yellen confirmed on Saturday that leaders of the world’s 20 biggest economies (G-20) have endorsed the “historic agreement” on new international tax rules, including a global minimum corporate tax rate of 15 percent. The new rule would also make it harder for multinational corporations, including tech giants like Google, Amazon, and Facebook, to avoid taxation by establishing offices in low-tax jurisdictions. It is estimated it will generate around $150 billion in additional global tax revenues annually, while stabilizing the international tax system and increasing tax certainty for taxpayers and tax administrations, according to the Organization for Economic Cooperation and Development (OECD). The new global minimum tax rate has been championed by Biden, who hailed it as a “game changer” while Treasury Secretary Janet Yellen told CNBC that what …