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Also: the personnummer carries a date that often means birth date, but there are cases where it’s not, but I’ve seen a few system that just assumes it’s the same.

> SSN from different ID space gets assigned to immigrants; when they become citizens they are assigned a new permanent SSN

Having gone through that, my personummer didn’t change. Maybe that doesn’t happen anymore?

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It does, but if you already have a Personnummer or get a residence permit right away so that you are eligible for one you don't get the temporary Samordningsnummer.

And the samordningsnummer isn't only for immigrants - it's also for Swedes born abroad who have never been folkbokförd.

They're still still an immigrant. The numbers are for residents (at some point in time) and citizenship isn't reflected by it.

Interesting, I've never heard of anyone referring to a citizen as an immigrant, but looking up the legal definition, they certainly are. TIL.

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