I'm out of state compared to my employer and they had to establish a "nexus" or something because I am here, which required them to do something like register as a business and withhold state tax; I assume they're paying into some sort of unemployment in my state for me. All of those things became much more important when Covid hit, but cross-border employment has been big in Chicago, New York, Minneapolis, etc for a long-time, so it's a solved problem (by someone).
I was commuting across state lines at the time. Never looked deeply as I left before it became relevant and it was what it was in any case. MA would have been more than NH and I thought it would be NH but not sure why.
But the bigger point is that unemployment insurance is very little money compared to a good professional salary.
