What is 183-Day Rule?

How it works

183 days is roughly half a calendar year (365 ÷ 2 = 182.5). The logic is mechanical: spending more time in one country than anywhere else makes that country presumptively your home for tax purposes. France, Germany, Spain, Italy, the UK, Canada, Brazil and dozens of others all use 183 days as a primary residency trigger.

Implementation varies in three meaningful ways:

• Counting basis. Some countries count any day with physical presence (arrival and departure both count). Others use a "midnight test" — you must have been in the country at midnight for the day to count. The UK Statutory Residence Test uses midnight; France counts any partial day.
• Reference period. Most count per calendar year. Others use rolling 12-month windows. The US Substantial Presence Test uses a weighted three-year formula. Georgia counts 183 days in any continuous 12-month period (per PwC).
• Other thresholds layered on top. Cyprus has a 60-day fast-track for those with no other tax residency. UAE adds a 90-day threshold for nationals and permit holders with permanent residence or local employment (Cabinet Decision 85 of 2022).

The 183-day rule is necessary but not sufficient in most jurisdictions. France considers you tax resident if your foyer (family home) is in France even with under 100 days of presence (article 4B CGI). Germany applies an unlimited-tax-liability test based on Wohnsitz (any home available for use). Spain layers a centre-of-economic-interests test (>50% of assets or income in Spain). Failing 183 days does not free you from residency in those countries if the other tests still trip.

Examples

• French entrepreneur moves to Dubai. Spends 220 days in the UAE, 100 days in France. Under the UAE's 183-day rule he is UAE tax resident. Under France's article 4B CGI, his wife and kids in Lyon can keep him French-resident regardless. The treaty tie-breaker may then resolve to UAE — but the conflict is real and requires documentation.
• Programme entrepreneur in Paraguay. Spends 130 days in Asunción. Local presence rule and threshold should be checked against the current Paraguayan code; widely-cited figures online (including older PwC summaries) have been challenged in practice. Verify against the current Paraguayan statute before relying on a specific day-count claim.

Common mistakes

• Treating 183 days as universal. Cyprus has a 60-day fast-track, Switzerland has the 30-day "gainful work" rule, Brazil counts non-consecutive days over a 12-month rolling window. Always check the local statute.
• Counting calendar days when the rule uses something else. UK midnight test, US weighted formula, Australia's "domicile or 183-day or superannuation" trifecta all break the simple "I was there X days" model.
• Forgetting partial days and transit. France counts arrival and departure days both. So does the US. A 36-hour weekend trip is two days, not one.
• Treating the count as the only test. France, Spain, Germany, the UK, Italy all have permanent-home or vital-interests fallback tests that can hold you tax resident with under 100 days of presence.