The suggestion, by Badger and Nononymous, for this new thread came from a comment by Elizabeth, which I’ve excerpted here and can be found in its entirety at this link followed by several comments in reply.

Please share your information and experience regarding estate matters for former US citizens both in reply to Elizabeth’s question and/or in a broader sense, and ask your own questions about these matters on this thread.

 Elizabeth wrote:  . . . My father, who was born in the USA and moved to Canada in [the 1980s], passed away recently. A little background… after moving here he was under the impression that he didn’t need to file taxes in the US if he properly filed in Canada . . .  He relinquished his US citizenship in [the 1990s] by taking the citizenship oath in Canada, along with the rest of our family. He never lived as an American after that, never renewed his US passport, never lived there. He did collect Social Security from the years he did work there, but that was it.   His accountants want me to file US taxes for his estate, but I don’t think I need to as he was not a US citizen anymore.