[bsder]

For example: you have to pay up front, lump sum taxes on things like pensions and retirements, but you still can't withdraw them.

It's expensive to renounce US citizenship.

[ForHackernews]

> lump sum taxes on things like pensions and retirements

You mean if they've been living and working for years in the US, and taking advantage of US tax-advantaged retirement accounts?

Now we're talking about a different person than the parent commenter: "(loosely defined as people who were born in the US decades ago) who do not live or work in the US "