Estate tax treaty US-Switzerland [2024]

I’m interested in any kind of proof, if there is anything you can share. I would like to blast IBKR support with it, so they need to clarify under which circumstances they lock and don’t lock assets. Because as linked above, they told me they wouldn’t.

Vice versa, you could ask them why they told other people there would be no locking. Not that they would then unlock, but maybe explain themselves.