183-day rule calculator
Enter your stays in one country, choose how that country counts, and see how many days you have against the 183-day line, and the day you reached it.
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One stay, three different answers
Most countries call you tax resident once you spend about half a year there, often 183 days. The number is the easy part. The hard part is the period it is counted over, and countries don’t agree:
- Calendar year (January 1 to December 31): the most common, used by Spain, Italy and many others.
- A tax year with its own start: the UK from April 6, Australia from July 1, India and New Zealand from April 1, South Africa from March 1.
- Any 12 months: some countries, such as Portugal, look at every 12-month stretch, not a fixed year, so a stay that straddles New Year can still add up.
A worked example
You spend September 15, 2026 to April 30, 2027 in Spain, one long winter. That is 108 days in 2026 and 120 in 2027: under 183 in each calendar year, which is how Spain counts.
Counted over a UK-style tax year (April 6, 2026 to April 5, 2027) the same stay is 203 days, and day 183 falls on March 16, 2027. A country that counts any 12 months would see the whole stay in the 12 months to April 30, 2027: 228 days. Same trip, three answers, which is why the calculator lets you switch between them.
How the calculator counts
- Arrival and departure days count as full days. That is the usual rule and the safe one.
- “Resident from” is the day count that makes you resident. For a rule that says “183 days or more” enter 183; for “more than 183 days” enter 184.
- For any 12 months, it shows the 12 months ending on your date and the busiest 12 months up to then.
The UK counts a day only if you are in the country at midnight, and it decides residence with ties as well as days. Use our 183-day rule guide for the UK and US tests, and the substantial presence test calculator for the US.
Questions people ask
Does spending 183 days somewhere always make me tax resident?
Not always, and not only. Many countries also look at your home, family and work, so you can be resident with fewer days, or treaty rules can decide between two countries. The day count is usually the first test, not the whole answer.
Is it 183 days or more than 183 days?
It depends on the country’s wording. Some say 183 days or more, others more than 183 days (so 184 makes you resident). Set the number in the calculator to match.
Do part days count?
In most countries, yes: any part of a day in the country is a day. The UK is the well-known exception, counting days where you are there at midnight.
Can I check two countries?
Run the calculator once per country. To watch several at once with your real trips, add them to Stamp90 and each country gets its own counter.