also called 183 day rule · half-year rule
A common guideline that spending more than half a year in a country can make you tax resident there, though the exact count and extra conditions vary.
The rough idea that if you spend more than half a year in a country, that country starts treating you as a tax resident. It is a guideline, not a law, and almost every country writes its own version. Some count calendar days, some count a rolling window, some start counting the day you arrive and some the day after. Several will call you resident well under half a year if you have a home or a family there.
You split a year between three countries, keeping under half a year in each, and assume that means you owe tax nowhere new. One of them counts a rolling window rather than a calendar year, and your stay straddles the turn of the year in a way that trips it. The letter arrives long after you have moved on.
Miscounting days across borders can accidentally trigger tax residency, and many countries add other tests beyond the day count.
The difference is the whole point, so here is each one in a line.
These are the tests a single country uses to decide it can tax you, mostly by counting days.
The 183-day rule is the rough guideline that more than half a year makes you resident, and the 183-day myth is the mistaken belief that staying under it always keeps you safe.
The US substantial presence test, the UK Statutory Residence Test, and the US Physical Presence and Bona Fide Residence tests are formal versions, tax residency by day count vs ties names the underlying choice, time-in-country tracking is keeping the precise record, and residence is simply where you actually live.
Bona Fide Residence Test · Physical Presence Test · Substantial presence test · Time-in-country tracking
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