Cross-border families: residency and the non-dom shift
Wealthy families are more mobile than ever, and tax regimes are moving under them. Why residency planning is now a continuous discipline, not a one-off.
For a long stretch, certain residency regimes felt permanent. A family established itself in a favourable jurisdiction, took advice once, and moved on. The structure sat there, quietly doing its job, and nobody thought about it again until a sale or a death forced a review.
That assumption is gone.
Across the jurisdictions that once competed hardest for mobile wealth, the welcome has cooled. Favourable treatments are being narrowed, tightened, or withdrawn outright. The reasons vary by country, but the direction does not. Governments have decided that the optics of a generous regime for the internationally rich are no longer worth the revenue forgone. What was a settled feature of a family’s planning becomes, almost overnight, a liability under review.
Families feel this as instability. They built around a rule. The rule changed. And because they are mobile, the change in one place interacts with rules everywhere else they touch.
Mobility multiplies the problem
A single-jurisdiction family has one tax authority to satisfy, one succession law to plan around, one reporting regime to keep clean. A cross-border family has several of each, and they do not agree with one another.
Two countries can both consider a person resident in the same year. Two systems can both claim taxing rights over the same asset. A will that works in one place can be partly overridden by forced-heirship rules in another. Trust structures that are well understood in one legal tradition are treated with suspicion, or simply not recognised, in the next. None of this is exotic. It is the ordinary condition of a family with a house in one country, a business in another, children studying in a third, and a passport from a fourth.
The complexity compounds. Each new connection to a jurisdiction is not an addition but a multiplication, because every relationship has to be reconciled against all the others. Reporting obligations alone now stretch across borders in ways that make a quiet, forgotten structure dangerous rather than convenient. Information moves between authorities. What was invisible is not invisible any more.
This is why the one-off model fails. A piece of advice that was correct when given decays as soon as a regime shifts or the family moves. Residency planning has become something closer to maintenance: a position that has to be monitored, tested, and adjusted as the rules and the family both keep moving.
The trap of optimising for tax alone
The sharpest mistake is to treat all of this as a tax problem with a tax answer.
It is tempting. Tax is measurable. A lower rate is a clear win, and a clever structure feels like progress. So families chase the regime, relocate for the relief, and arrange their affairs around the number. Then the regime closes, or the family discovers that the place they moved to for tax reasons is not where they want their children to grow up, run the business, or eventually inherit.
Residency is not only a fiscal status. It pulls in succession law, the question of where real economic substance actually sits, family relationships, and the plain matter of where people want to live. A structure that is beautiful on tax and indifferent to everything else tends to fail on contact with reality. Someone dies in the wrong country. A child marries under a different legal system. An authority asks where the decisions are really being made and does not like the answer.
The families who handle this well treat tax as one input among several, not the objective. They start from purpose. Where does this family want to be based, in fact and not just on paper. What does continuity require. Then they fit the tax position to that, rather than bending the family to fit a regime that may not survive the decade.
That kind of work cannot come from a single lawyer in a single jurisdiction reading a single rulebook. It needs coordinated advisers who can hold several systems in view at once and spot where they collide, and it needs someone willing to say that the cleverest tax outcome is the wrong one for this family. Knowing which advisers can actually do that, rather than claim they can, is its own problem, and a reason to be careful about who sits around the table. The starting point is to treat the question as one of choosing the right people rather than buying a structure.
The regimes will keep moving. The families who suffer least are the ones who stopped expecting them to stand still.
