Taxation isn't primarily by residency but rather by income source, and sourcing rules make it very easy to have income attributed places other than where you li

Taxation isn't primarily by residency but rather by income source, and sourcing rules make it very easy to have income attributed places other than where you live. (I was taxed by both California and Illinois in 2019 despite continuous residence in Tokyo, due to being physically present in each jurisdiction for N days and working during some portion of them, with N in the ~20ish region.)