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. Many 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
Loading…
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. The 183-day count resets every January 1, but Ireland also adds last year's days to this year's under its 280-day two-year test.
- 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 spend August 1, 2026 to February 15, 2027 in one country. That is 153 days in 2026 and 46 in 2027 — under 183 in each calendar year, so nothing triggers in a calendar-year country such as Spain. But switch to the rolling mode and the same stay shows 199 days inside a single 365-day window — over a "183 days in any 12 months" rule. 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 about half the year in a country within its counting window — 183 days or more in some countries, more than 183 in others such as Spain — and you typically become tax resident there, usually taxable on your worldwide income. 183 days is just over half of a 365-day year (and exactly half of a 366-day leap 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.
Often yes — Ireland and Australia, for example, count any day you are present for any part of the day, so this calculator counts entry and exit days in full. Others differ: the UK counts the days you are present at midnight, and some countries have 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.
Your entries are saved only in your own browser (localStorage), and clearing your browser data removes them. We do record usage events that aren't linked to your name, including the day total and the result category the calculator shows, but not the dates of your trips.
This rule is tracked automaticallyin
Bounded
- Automatically tracks your days for this rule
- Alerts you before you cross the limit
- Records border-crossing days in both countries
- Runs alongside your other visa, tax, and residency rules
Sources
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.