Tax residency is the status that ties you to a country’s tax system. It is often based on domicile, days present, centre of vital interests, or similar tests — not merely citizenship.
Your crypto tax obligations (forms, rates, wealth tax, reporting) generally follow residency. Dual residency and year-of-move cases need treaty analysis.
Why it matters: using the wrong country’s software presets or forms is a foundational error.
Educational definition — not tax advice. Rules vary by country.