Dunno. They haven't actually agreed to minimum rates yet. They just said they might in future.
Broadly, you are not going to convince pure tax havens (eg Bermuda) to close tax loopholes. They don't even have corporate tax. You can do other things though.
Part of the problem here is that reporting is mixing up issues. It's not clear how (if at all) the MSFT-Bermuda shenanigans relate. The minimum tax rate hasn't been done yet, and may not be. What they do seem to have agreed on is some sort of joint accounting standards. Accounting standards define what counts or doesn't count as an expense, investment, etc.
Where that (may, we don't know yet) relate to the rest of 180+ countries is, for example: US accounting standards no longer recognize payments to (for eg) the Bermuda entity as an expense transaction.
When you are uncoordinated, discrepancies in these standards allow companies to pick and choose.
Broadly, you are not going to convince pure tax havens (eg Bermuda) to close tax loopholes. They don't even have corporate tax. You can do other things though.
Part of the problem here is that reporting is mixing up issues. It's not clear how (if at all) the MSFT-Bermuda shenanigans relate. The minimum tax rate hasn't been done yet, and may not be. What they do seem to have agreed on is some sort of joint accounting standards. Accounting standards define what counts or doesn't count as an expense, investment, etc.
Where that (may, we don't know yet) relate to the rest of 180+ countries is, for example: US accounting standards no longer recognize payments to (for eg) the Bermuda entity as an expense transaction.
When you are uncoordinated, discrepancies in these standards allow companies to pick and choose.