Thank you for the question.
The global minimum tax is being negotiated at the OECD's inclusive framework, which is a group that involves over 140 nations. The intention is to address remaining risks from base erosion and profit shifting, even after other recent initiatives from the OECD and others.
It's also to put a floor on tax competition and do away with the tax competition that is available currently when countries can have corporate tax rates down as low as 0%.
The general framework that is being negotiated involves looking at a multinational of a certain size. The threshold that's being used is 750 million euros in revenues. That multinational would need to calculate the effective tax rate on its operations in each jurisdiction in which it operates, and a top-up tax to get to 15% would be levied whenever the effective tax rate in that jurisdiction is less than 15%. This calculation would be based on the modified version of the accounting profits of the multinational in each jurisdiction.
The next question would be who gets to collect that top-up tax. The hierarchy or the order effectively provides the first right to tax—to collect that top-up tax to get to 15%—to the jurisdiction in which there is the low-taxed income. If that jurisdiction doesn't tax up to 15%, then the top-up tax could be collected by the jurisdiction in which the multinational is headquartered.
If that jurisdiction does not implement the global minimum tax, there's effectively a backup rule to ensure that multinationals, no matter where they're headquartered, are subject to the minimum tax. This backup rule would take the aggregate amount of low-taxed income across the multinational that has not been taxed up to 15% and then allocate it out to the countries where the MNE operates that have implemented the minimum tax using a formula based on where its employees and its tangible assets are located.