Spending fewer than 183 days somewhere does not automatically make you a non-resident, and spending more does not always make you resident. The rule is one test among several.
What the rule actually says
Most countries treat you as tax resident if you are present for more than 183 days in a given period. It is a bright line that is easy to measure, which is why it gets all the attention.
Why it is only part of the test
Many countries add other tests: a permanent home, your centre of vital interests, habitual abode or family location. You can be caught by one of these even under 183 days.
So counting days is necessary but not sufficient. Bulgaria, for example, also looks at permanent address and centre of vital interests, as we cover in becoming a Bulgarian tax resident.
The country you leave still matters
Reducing your days in your old country does not end its claim if you keep a home, family or business there. This is the mistake that undoes otherwise good plans.
When two countries both claim you
If two countries each treat you as resident, a double tax treaty's tie-breaker rules step in, usually looking at permanent home, then centre of vital interests, then habitual abode, then nationality.
Designing your move so the tie-breaker lands where you want is the heart of tax strategy.
Work with us
We plan your ties and day counts so your residency position holds up. See our tax strategy service, or Book a Consultation.
What this means in practice
Track your days, but plan your ties. The goal is a position that holds up on the facts, not just a favourable day count.