Which residency calculator do I need?
Tax residency rules use different math: rolling windows, weighted formulas, ties tests, plain day counts. Answer two quick questions and this wizard points you at the right free calculator for your situation.
What are you trying to figure out?
Step 1 of 2Every calculator, at a glance
Prefer to browse? Here is the full set of free calculators and the situation each one is built for.
- 183-day rule calculator
Any country or US state with a simple day-count threshold.
- Schengen 90/180 calculator
Non-EU citizens visiting the Schengen Area.
- Substantial Presence Test calculator
Non-citizens spending time in the US (IRS 3-year formula).
- UK Statutory Residence Test calculator
Anyone with UK days and UK ties (home, work, family).
- New York 184-day rule calculator
Anyone with a New York apartment or house who also spends days there.
- Canada residency calculator
Anyone leaving or entering Canada with ties there.
- FEIE 330-day calculator
US citizens abroad claiming the Foreign Earned Income Exclusion.
- Multi-country day counter
Anyone racing several thresholds in the same year.
- Treaty tie-breaker walkthrough
Anyone whom two countries both claim as a tax resident.
- Tax year calculator
Anyone counting days against a non-calendar tax year (UK, Australia, and more).
Which calculator should you use?
Why isn't one calculator enough for every jurisdiction?
Because the rules use different math. Most countries count days in a calendar year against a 183-day threshold, but Schengen uses a rolling 180-day window, the IRS Substantial Presence Test weighs three years of days, the UK combines day counts with ties, and New York pairs 184 days with a permanent place of abode. Each of those needs its own calculation.
What if more than one rule applies to me?
That's common: a non-EU consultant working in Europe can face Schengen 90/180, a country's 183-day rule, and the US Substantial Presence Test in the same year. Run each applicable calculator, or use the multi-country day counter to watch several plain day-count thresholds at once.
Are these calculators really free?
Yes. Every calculator on this site runs entirely in your browser, with no signup and no upload. Nothing you enter leaves your device.
What's the difference between these calculators and the Tax Days app?
The web calculators are one-off checks: you type in your trips each time. The Tax Days iPhone app stores your trips privately on your device and evaluates them continuously against 80+ residency rules in 254 jurisdictions, projects the date you'd cross each threshold, and notifies you before it happens.
Do these tools give tax advice?
No. They compute day counts and rule thresholds from the dates you enter, which is general information, not advice. Residency outcomes can turn on facts beyond day counts, so confirm any real decision with a qualified professional.
Or skip the wizard entirely
Tax Days runs every one of these rules at once. Log a trip on your iPhone and it checks 80+ residency rules across 254 jurisdictions, then warns you before you cross any threshold.
