183-Day Rule Calculator
Count your days of presence in a country against a 183-day rule (or any other threshold) — over a calendar year, the worst rolling 12-month window, or a custom tax year. Enter your trips once and switch windows to match how the country you care about counts.
1 · Your days in the country
Add every stay in the country you're counting for. Most tax authorities count arrival and departure days in full — this calculator does too, so treat the result as the conservative count.
2 · The counting window
3 · Where you stand
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Which window does your country use?
The threshold is usually 183 days, but the window it's measured over varies:
- Calendar year — Spain, Canada, Ireland, and most of Europe. The count resets every January 1.
- Any rolling 12 months — the UAE, Morocco, and Nigeria. There is no reset date; use the rolling mode and watch the worst window.
- A national tax year — the UK (April 6 to April 5) and India (April to March, with a 182-day line). Use the custom-range mode with the exact tax-year dates.
Browse every country's exact test — including ties rules that can trigger residency below the day count — in the tax residency rulebook.
A worked example
Say you spent January–March (90 days) and June–August (92 days) in Spain: 182 days in the calendar year — one day under. But switch to the rolling mode and the same trips show a worst 365-day window of 182 days too; add a single New Year's trip the following January and the rolling window crosses 183 even though each calendar year stays under. Which of those numbers matters depends entirely on which window the country uses — that's the trap this tool is built to catch.
Frequently asked questions
The most common tax-residency threshold: spend 183 days or more in a country within its counting window and you typically become tax resident there, liable on your income and often worldwide assets. 183 is just over half a year — the idea is that the country where you spend most of your time gets the primary claim.
It depends on the country. Spain, Canada, and Ireland count the calendar year; the UAE and several others use any consecutive 12-month window; the UK's Statutory Residence Test uses its April-to-April tax year. That's why this calculator offers calendar-year, rolling, and custom-range modes.
Usually yes — most tax authorities count any day you are present for any part of the day, so this calculator counts entry and exit days in full. A few countries use midnight counts or special part-day rules; check the country's rule page for the exact treatment.
No. The day count is only one test. Many countries also apply ties tests — a home, spouse, or economic center there can make you resident with far fewer days (Spain and Canada are classic examples). Staying under the threshold protects you from the day-count route only.
Only in your own browser (localStorage). Nothing you type is sent to a server, and clearing your browser data removes it.
This rule is tracked automaticallyin
Bounded
- Automatically tracks your days for this rule
- Alerts you before you cross the limit
- Counts arrival and departure days correctly
- Runs alongside your other visa, tax, and residency rules
Get the appSources
For information only. This calculator is a planning aid based on publicly available rules, not tax, legal, or immigration advice. Border officers and tax authorities make the final call — always confirm with the official sources linked above and a qualified professional before acting.