The most expensive mistake I see founders make when they relocate isn’t choosing the wrong company — it’s the move itself. They leave one country but never properly break its tax residency, then arrive somewhere new and trip its residency test. Now two countries both claim the right to tax their worldwide income, for the same year. Here’s how that happens, and how to sequence a move so it doesn’t.
Tax residency isn’t what most people think it is
Two beliefs cause most of the damage: “my passport decides where I’m taxed,” and “my company is in Hong Kong, so I’m taxed in Hong Kong.” Both are wrong.
Personal tax residency is about you, not your documents or your company. Countries commonly look at some combination of:
- Days present — often a threshold such as 183 days in a year, but rarely the only test
- Permanent home — where you have a dwelling available to you
- Centre of vital interests — where your family, economic and personal ties are strongest
- Domicile — a deeper, long-term concept some countries use on top of residency
The “183-day rule” is the part everyone remembers and the part that misleads people most. You can spend fewer than 183 days somewhere and still be treated as resident because your home and your life are there — and you can clear 183 days in a country you never intended to be taxed by.
How you end up resident in two countries at once
Residency isn’t a light switch that flips the day your flight lands. Leaving a country cleanly usually takes deliberate steps — closing out a home, moving your family and interests, and satisfying that country’s own exit tests. Miss those and you stay resident there in the eyes of its tax authority.
Meanwhile, the country you’ve moved to starts counting from the day you arrive. Move in the middle of a tax year, keep a foot in both places “just until things settle,” and you can satisfy residency tests in both for the overlapping period. That’s dual tax residency — and it’s far more common among mobile founders than most realise.
Your company doesn’t shield you
A Hong Kong company is often the reason founders assume they’re safe. Hong Kong taxes profits on a territorial basis, so the company itself may owe little or nothing on foreign-sourced income. But that says nothing about where you are taxed — and your own residency can reach back and create exposure for the company too.
Two mechanisms matter here:
- Where the company is really run. Many countries look at “central management and control” or the “place of effective management.” If you run your Hong Kong company day-to-day from a high-tax country you’ve become resident in, that country may argue the company is tax-resident there as well.
- Attribution to the owner. “Controlled foreign company” rules in many countries can pull a foreign company’s profits onto the personal tax return of a resident owner, regardless of where the company banks or bills.
The takeaway: where you incorporate is not where you’re taxed. The company and your personal residency have to be planned as one thing.
Treaties and tie-breakers — the safety net, not a guarantee
When two countries both claim you, a double tax agreement (DTA) between them — if one exists — usually settles it with a “tie-breaker” sequence: your permanent home, then your centre of vital interests, then where you habitually live, and finally your nationality. The treaty assigns you to one country for treaty purposes and provides relief so the same income isn’t fully taxed twice.
The catch: this only works cleanly where a treaty exists and where you can actually evidence the facts. Between some country pairs there’s no treaty at all, and relief comes down to messy foreign-tax-credit claims — if it comes at all. Hong Kong has a growing network of treaties, but not with every country, so “there’s probably a treaty” is not a plan.
The Hong Kong and mainland China angle
For founders moving into our region specifically: Hong Kong’s territorial system is genuinely attractive, but the benefit is realised properly only when your personal residency is arranged to match. Simply owning a Hong Kong company while remaining tax-resident somewhere with worldwide taxation can leave the advantage on the table.
Mainland China is stricter and more day-count driven for individuals, with its own domicile and multi-year rules on when worldwide income comes into scope. If your relocation involves a WFOE and a work visa, your company and your personal tax position are tightly linked from the start — which is exactly why we treat them as one project rather than two. Specifics change and depend on your facts, so treat this as orientation, not a ruling.
How to sequence the move
Almost every dual-residency mess is a sequencing problem, and sequencing is planned before you move, not patched afterwards. In practice that means:
- Know your intended exit date from your old residency and what that country requires to accept you’ve left
- Know your entry date to the new one and how it counts days and ties
- Map the overlap — the window where both could claim you — and keep it as small and well-documented as possible
- Keep records: travel dates, housing, where your family and interests actually sit
- Get advice before the move, when you can still choose dates, not after, when you can only explain them
It’s unglamorous work. It also routinely saves five figures — and a year of correspondence with two tax authorities.
Relocating your business and yourself?
We set up the company, the banking and the residency question together, so they don’t contradict each other. One team, one coordinated plan.
Get a tailored planFrequently asked questions
Is tax residency the same as where my company is registered?
No. Where a company is incorporated doesn’t determine where you’re taxed, and may not even determine where the company is taxed. Your personal residency is about where you spend your time, where your home is, and where your life is centred.
Can I really be tax-resident in two countries at once?
Yes — if you leave one without breaking its residency and become resident in another. A treaty’s tie-breaker rules usually resolve it; without a treaty, you can face exposure in both.
Is it just the 183-day rule?
No. A day-count is common, but permanent home, centre of vital interests and domicile all matter. You can be under 183 days somewhere and still be resident.
When should I get advice about a move?
Before you move. Exit dates, entry dates and day counts are easy to plan ahead and hard to fix in hindsight.
Disclaimer: This article is general information for internationally-mobile founders, not tax, legal or immigration advice, and not advice for your specific situation. Tax-residency rules differ by country and change over time. Always confirm your position with a qualified tax professional in each relevant country before you act.