The 183-day rule is a starting point, not the whole story. Track the days you spend in each country against the threshold that makes you resident — and see where you are at risk, where you may be resident in two places at once, and what to confirm before it matters.
Countries decide tax residence with a mix of tests: a day count (often, but not always, 183), whether you have a home available to you, and where your centre of life is — your family, work, and ties. You can be under 183 days everywhere and still be resident somewhere because that is where your life is. And if two countries both claim you, you are dual-resident, and only a tax treaty's tie-breaker decides which one wins.
How many days, under whose counting rule — calendar year or rolling window, partial and transit days included or not?
A home kept ready for you — even unused — can keep you resident in a country you thought you had left.
Where your family, work, and economic ties sit. The catch-all that overrides a low day count.
Forty chapters and a ten-model companion workbook on where you are taxed, how not to be taxed twice, where to hold what you own, the move itself, and passing it on across borders. Get the chapter on residency tests and the launch notice.