also called tie-breaker test · tiebreaker
Provisions in a tax treaty that decide which of two countries you are resident in when both claim you at the same time.
What settles it when two countries both say you are their tax resident. Tax treaties carry a sequence of tests, applied in order, and you stop at the first one that gives an answer: where you have a permanent home, then where your life is really centred, then where you habitually live, then which passport you hold. It only exists inside a treaty. If the two countries have no treaty with each other, there is nothing to break the tie and both claims can stand.
You move abroad but keep a flat back home that sits empty for you. The new country says you live there now, the old one points at the flat. The sequence gets applied to your actual life, and the answer turns on things you never thought were evidence, like where your family stays and where your bank statements go.
When two countries both call you resident, the tie-breaker (home, centre of vital interests, habitual abode, nationality) decides who taxes what and prevents double taxation.
The difference is the whole point, so here is each one in a line.
These are the tie-breakers for when day counts are inconclusive or two countries both claim you.
A tie-breaker rule in a tax treaty decides which one wins, weighing your centre of vital interests, your habitual abode, and a substantial ties test of where your closest links are.
Domicile is your permanent home in the legal sense and deemed domicile is being treated as domiciled after long residence; the 183-day tie to home country is how your original country keeps claiming you until you settle elsewhere, and a tax treaty override is a clause letting a country tax you as if the treaty did not exist.
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