The 183-day rule, compared
"183 days" is the best-known number in tax residency — and one of the most misleading. Below is how fifteen countries actually count. Every row links to a calculator that applies that country's own convention to your travel ledger, with the official source cited.
| Country | Threshold | Period counted | How days count |
|---|---|---|---|
| 🇺🇸 United States | 31 days + weighted 183 | calendar year (3-year lookback) | any part of day |
| 🇬🇧 United Kingdom | 46 / 183 days (ties in between) | 6 April – 5 April tax year | present at end of day |
| 🇫🇷 France | 183 days (indicator) | calendar year | any part of day |
| 🇪🇸 Spain | 183 days (presumption) | calendar year | any part of day |
| 🇮🇹 Italy | 183 days (indicator) | calendar year | any part of day |
| 🇸🇬 Singapore | 183 days | calendar year | any part of day |
| 🇦🇺 Australia | 183 days (one of four tests) | 1 July – 30 June income year | any part of day |
| 🇮🇪 Ireland | 183 days (or 280 over two years) | calendar year | any part of day |
| 🇨🇭 Switzerland | 90 nights (cantonal) | calendar year | nights spent |
| 🇦🇪 United Arab Emirates | 90 / 183 days | calendar year (statute: any 12 months) | any part of day |
| 🇩🇪 Germany | No day threshold (dwelling / habitual abode) | calendar year (evidence scale) | any part of day (informational) |
| 🇨🇦 Canada | 183 days (presumed / deemed resident) | any 12-month period (calculator: calendar year) | any part of day |
| 🇭🇰 Hong Kong SAR | 60-day visits rule (employment income), no residency day test | year of assessment (calculator: calendar year) | any part of day (visits counted) |
| 🇲🇾 Malaysia | 182 days | calendar year | any part of day |
| 🇹🇭 Thailand | 180 days | calendar year | any part of day |
| 🇵🇭 Philippines | 180 days | calendar year | any part of day |
Where "183 days" actually comes from
The figure traces to the OECD Model Tax Convention's article on tie-breaking residence between two treaty countries, and many domestic laws adopted it. But domestic rules are what actually bind you, and they differ more than most travellers expect. The US adds a weighted three-year formula on top of a 31-day floor. The UK replaced its old day rules with a three-layer Statutory Residence Test. Switzerland counts nights. Spain counts your "sporadic absences" against you. Malaysia stops at 182.
There is also a deeper trap: in several countries the day count is an indicator, not the rule. France, Italy and Australia all make you resident through housing, family or economic ties even far below their day thresholds — and conversely, some day counts can be rebutted with evidence. A day calculator that hides this gives false comfort; the country pages on this site carry the full caveat set for each rule.
How to use this table
Pick the countries you actually spend time in, open their calculators, and enter your trips once — the same ledger is evaluated under each country's own counting convention and window. The calculator shows the exact arithmetic, your remaining safe days, and the official publication behind each rule.
Not the same rule: Schengen 90/180
Visitors often arrive here looking for the Schengen 90/180 rule — that is a border/stay rule (90 days in any rolling 180-day window across 29 states), not a tax-residency threshold. It lives on its own page with the same ledger: the Schengen 90/180 calculator.
Going deeper
The 183-day rule in Europe, country by country · the US weighted formula explained · the UK Statutory Residence Test explained · UK split-year wizard · treaty tie-breaker wizard (dual residency) · Japan's no-day-test system · tax residency for digital nomads
Frequently asked questions
Is there a universal 183-day rule for tax residency?
No. The 183-day figure originates in tax-treaty articles and some domestic laws, but countries diverge widely: Malaysia uses 182 days, Thailand and the Philippines 180, the UAE starts at 90, Ireland aggregates 280 over two years, the US weighs three years, and the UK runs automatic tests plus a ties test over a 6 April–5 April tax year.
Do the day I arrive and the day I leave count as days of presence?
It depends on the country. The US, Ireland and most 183-day countries count any day with any presence. The UK counts a day only if you are present at the end of it, so arrival days count and departure days do not. Switzerland measures nights.
What happens after I cross the threshold?
For presumption-based rules (Spain, Malaysia, Thailand), crossing the day threshold generally makes you tax resident for that year. For indicator-based rules (France, Italy) residency follows from your overall life arrangement, and for rule-based systems like the US and UK the day count is only one layer. The country pages explain each system.
Can I be a tax resident of two countries at once?
Yes — each country applies its own domestic rules, and both can claim you. When a double-tax treaty exists, its tie-breaker cascade (permanent home, centre of vital interests, habitual abode, nationality) allocates residence between them.