Most countries do not tax purely on citizenship. They tax based on tax residence, and tax residence does not automatically end just because you move abroad. That’s why people living outside the UK can still owe UK tax. ⸻ How countries like the UK actually tax people Using the UK as the clearest example: The UK taxes based on residency and source of income, not passport. You can live abroad and still pay UK tax if any of the following are true: 1. You are still considered a UK tax resident Reside