Vietnam is the easiest country in this series to fall for and one of the hardest to build a permanent life inside. That is the whole story, and it is worth saying plainly before the enthusiasm sets in. You can land in Da Nang with a portfolio, a warm-weather plan and a genuine love of the place, live extraordinarily well for very little, and still discover a year later that the country has given you almost nothing you can hold. No retirement visa. No route to permanent residence that fits you. No ownership of the land under your apartment. No realistic citizenship. What Vietnam gives freely is access. What it withholds, almost systematically, is architecture.

The single line I kept returning to during the research is this: Vietnam is easier to afford than to formalize. Every attractive fact about the country, and there are many, survives the affordability test and stumbles on the formalization test. And there is a smaller, stranger truth sitting underneath it that captures the mismatch better than anything else I found. Under the Personal Income Tax Law that took effect on 1 July 2026, spending most of a year in Vietnam makes you a Vietnamese tax resident on worldwide income, whether or not the immigration system has given you any status at all. So you can be a Vietnamese taxpayer and an immigration tourist at the same time. The tax net catches you the moment the residence system refuses to.