To answer your question, this wouldn't create a new organization to collect a global tax. Instead it would give the IRS the authority to tax American companies (say, Google) an additional amount on their overseas earnings. So, if they paid 13% in Irish tax, but the American tax rate is %21, the IRS could charge them the gap (an additional 8%). This would be true in all countries that sign the agreement.
Obviously tax havens would still exist, but they'd be harder for big multinationals (like American tech giants) to abuse.
Bloomberg has a better write up: https://www.bloomberg.com/news/articles/2021-04-08/plans-for...
To answer your question, this wouldn't create a new organization to collect a global tax. Instead it would give the IRS the authority to tax American companies (say, Google) an additional amount on their overseas earnings. So, if they paid 13% in Irish tax, but the American tax rate is %21, the IRS could charge them the gap (an additional 8%). This would be true in all countries that sign the agreement.
Obviously tax havens would still exist, but they'd be harder for big multinationals (like American tech giants) to abuse.