Guides & how-tos

Tax residency, day counting, and the rules that catch people out.

Clear, practical guides to the day-count rules that decide where you owe tax - and exactly how to track each one automatically with Tax Residency Tracker on iPhone.

Global Rules The 183-Day Rule Explained (and How to Track It) What the 183-day rule really means, how countries count the days, the traps that catch travellers out, and how to track every 183-day threshold automatically on your iPhone. 8 min read Global Rules Schengen 90/180 Rule: How the Calculator Works How the Schengen 90/180-day rule really works - the rolling 180-day window, how days are counted, what the EES border system now tracks, what happens if you overstay, and how to track your remaining days automatically on iPhone. 8 min read Global Rules How to Count Days for Tax Residency (Every Method) The four ways tax rules count a day - calendar day, the midnight rule, full 24-hour days, and overnight stays - how transit and same-day border crossings work, and how to count them right on iPhone. 7 min read Global Rules How Many Days Can You Stay Without Becoming a Tax Resident? The real answer to how many days you can spend in a country without becoming tax resident - the 183-day default, the ties and rolling-window traps that lower it, and how to track your safe margin on iPhone. 7 min read Global Rules Domicile vs Residence: What's the Difference for Tax? Domicile and tax residence are not the same thing. Learn how they differ, why domicile is 'sticky,' how each is decided, and why dated day records matter for both. 9 min read Global Rules Tax Treaty Tie-Breaker Rules and Centre of Vital Interests Resident in two countries at once? Learn how double-tax-treaty tie-breaker rules decide: permanent home, centre of vital interests, habitual abode, nationality, then mutual agreement. 9 min read