183-Day Rule Calculator
Add your trips and see how many days you've spent in a country this tax year, and how many are left before the 183-day threshold. Runs in your browser. Nothing is saved or sent.
This count is only the days you entered. Reaching or staying under 183 does not by itself decide tax residency: your centre of vital interests, family ties and each country's own rules can override the day count.
Counting days doesn't prove them. A self-reported count has no value if a tax authority questions your residency. ResidenceSafe turns each day into a certified, blockchain-sealed record you can actually present.
Build certified proof, freeOr get our guide to documenting your days properly, sent to your inbox.
How to use it
How the 183-day count works
The 183-day rule is the most common test for tax residency. Spend 183 days or more in a country within its counting period, and it can treat you as a tax resident on your worldwide income. This tool counts those days for one tax year.
- Step 1
Add every stay
Enter each trip as an arrival and a departure date. Add as many as you need. Overlapping trips are counted once, never twice.
- Step 2
Any part of a day counts
In Spain, France and most jurisdictions, arriving at 11pm still counts as a full day of presence. This calculator uses that rule. Germany, which requires an overnight stay, is the main exception.
- Step 3
See how close you are
The total and the days remaining update instantly. Only days inside the tax year you picked are counted, so a December-to-January trip splits correctly.
Worked example. You arrive in Spain on 1 January 2026 and leave on 30 June 2026: that's 181 days. You come back for a week in October: now 188 days. You have crossed the 183-day threshold and Spain can treat you as a tax resident for 2026, on your worldwide income.
The catch
Knowing the number is not the same as proving it
This calculator tells you whether you cross a line. It cannot tell a tax authority where you actually were. When your residency is questioned, the burden of proof falls on you, and the evidence most people rely on doesn't hold.
- Fails
This spreadsheet, and any other
A count you typed yourself is self-reported. Anyone can enter any date. It has zero probative value in an audit, exactly like the calculator above.
- Fails
Google Timeline
Editable at any time. You can add or delete any location retroactively, and so can Google. Courts and tax authorities know this.
- Fails
Boarding passes
A boarding pass proves you took a flight, not that you arrived, and says nothing about the other 182 days.
- Works
A certified record
Biometric check-in, GPS, immutable timestamp, blockchain-sealed. That is what ResidenceSafe builds every time you check in, and what an auditor can independently verify.
Keep reading
Related resources
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How the 183-day rule really works
The counting periods, secondary tests and country differences the headline number hides.
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Spain's 183-day rule explained
How Hacienda counts days, the centre-of-vital-interests test, and what triggers residency below 183.
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Why counting days isn't enough
What a tax authority actually accepts as proof, and why a day count on its own holds up to nothing.
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How the 183-day rule works, country by country
How the count differs by country, what decides residence beyond the days, and why proving them is a separate problem.
FAQ
Frequently asked questions
How does the 183-day rule calculator work?
You enter each trip as an arrival and departure date. The calculator counts every calendar day you were present in the selected tax year, treating any part of a day as a full day and removing overlaps between trips. It then shows your total and how many days remain before the 183-day threshold. Everything is computed in your browser; no dates are sent to a server.
Does the day of arrival count as a day of presence?
In most countries that use the 183-day rule, including Spain and France, any part of a day spent in the country counts as a full day, so arrival and departure days both count. Some countries, such as Germany, require an overnight stay. This calculator uses the part-of-a-day rule. Always check the exact counting method for your jurisdiction.
Is counting 183 days enough to prove tax residency?
No. Counting days tells you whether you cross a threshold. It does not prove where you actually were. If a tax authority questions your residency, the burden of proof is on you, and a self-reported count has no probative value. You need certified, timestamped records of your physical presence.
Does this calculator store my travel dates?
No. The calculation runs entirely in your browser. Your trips are never sent to a server, logged, or saved. Reload the page and they are gone.
Disclaimer
This calculator is for general informational purposes only. It counts calendar days using a single, simplified rule and does not model secondary residency tests (centre of vital interests, habitual abode, family ties), tax treaties, or country-specific exceptions. It does not constitute legal, tax, or immigration advice. Always consult a qualified professional for your specific situation.
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