The 183-Day Tax Residency Rule - What Founders Need to Know
The "183-day rule" is the most misunderstood concept in international tax planning. Many countries use entirely different thresholds - and day counting is often just one of several triggers. Here is the actual data across all tracked jurisdictions.
3 of 23 tracked jurisdictions do not use the 183-day threshold.
Cyprus uses 60 days. Georgia does not use a day count at all - you become a resident by obtaining a permit. Panama uses 183 days but has a territorial system, so the threshold matters far less. Day counting is just one factor.
What is the 183-day rule?
The 183-day rule is a tax residency test used by many countries. If you spend 183 days or more in a country during a calendar year (or tax year), you are typically deemed a tax resident and your worldwide income becomes subject to that country's tax laws.
183 days is half a year plus one day. The logic is that if a country is your primary home, you should pay taxes there. However, this threshold originated from OECD model tax conventions and individual countries have since adopted their own thresholds.
Critically: exceeding the threshold does not automatically trigger residency in all countries. And in some countries, you can become a tax resident without ever meeting a day count threshold at all.
Countries where it is NOT 183 days
These jurisdictions use a different day threshold - which can work for or against you.
Day thresholds across all jurisdictions
Red = low threshold (risk of accidental residency). Amber = below 183. Grey = standard. Green = above 183 or no threshold.
Other triggers beyond day counting
Permanent home available
If you maintain a home available for your use in a country - even if you rent it out occasionally - many countries treat this as a residency trigger regardless of days spent.
Center of vital interests
Where are your family, your business relationships, your social ties? The OECD tiebreaker rule asks where your 'center of vital interests' lies. High-tax countries use this aggressively.
Habitual abode
Some countries look at where you habitually sleep, even across multiple countries. Spending 90 days each in 4 countries may still trigger residency in the one where you spend the most time.
Business registration
Running a business from a country - through clients, employees, or bank accounts - can create a permanent establishment even if you are not personally resident.
Domicile (UK-specific)
The UK Statutory Residence Test has 27 connecting factors. You can spend as few as 16 days in the UK and still be resident if enough factors apply.
How to track your days
Use passport stamps and entry/exit records as your primary source of truth.
Credit card and phone location data are discoverable in audits. They should match your day count.
In the EU, Schengen entry stamps track your presence across all Schengen countries as a bloc.
Travel apps like TravelSpend, Nomad Tax, or a simple spreadsheet work well. The key is consistency.
Partial days: most countries count arrival and departure as full days. A few count only one. Check the specific rule.
Keep boarding passes, hotel receipts, and utility bills. Physical evidence of where you actually slept matters most.
Compare these countries side by side
See full tax residency data alongside corporate tax, visa options, and practical setup costs.