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183-day rule calculator.

Add your stays and count your days of presence against the 183-day tax-residency threshold, either inside one calendar year or across any rolling 12-month window.

Your stays

Entry date

Exit date

Label (optional)

No stays yet. Add your first stay above.

Counting period

Calendar year 12-month window

Year

Projection start date Used for the continuous-stay projection. Defaults to today.

0 of 183

Waiting for input

Add at least one stay and press Calculate.

Days counted

Days below 183

183

Margin left before the 183-day line.

183 days reached on

Run a calculation

Projection assuming a continuous stay.

Last updated: 2026-07-13. This is not legal or tax advice. Residency rules differ by country, so confirm the counting method that applies to you.

How does this calculator count your days?

The calculator turns your stays into a set of distinct presence days, so overlapping trips are never double counted. Entry and exit days both count as full days, which matches how most countries treat partial days of presence. All math runs on plain calendar dates, so results do not shift with your device timezone.

Pick the counting period that matches the rule you are checking. If you are not sure which one applies, run both: the rolling window is always at least as strict as the calendar year. Background on the rule itself is in the 183-day rule guide.

What is the difference between the two modes?

Calendar-year mode counts your presence days inside a single year, January 1 to December 31, the way countries such as the United States (for state rules) and many European systems frame their threshold. It also projects forward: starting from your projection date, it finds the day a continuous stay would cross 183 days in that year.

Any-12-month mode slides a 365-day window across your whole travel history and reports the worst one: the window holding the most presence days, with its exact start and end dates. Countries and treaty rules that say 183 days in any 12-month period mean this stricter version, and a count that looks safe per calendar year can quietly cross 183 when two half-years stack inside one window.

What does the projection date tell you?

The projection answers one question: if you stay continuously from the projection start date, on which date do you reach 183 days in the selected year? It counts the days you already logged, then fills every remaining day forward until the total hits 183. If even a stay through December 31 stays under the threshold, the calculator says the year is not reachable.

Use it to plan exits: the day before the projection date is the latest you can begin worrying, not the first.

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FAQ

183-day questions, answered.

For the full picture, read the 183-day rule guide or check your own numbers in the calculator above.

How do I count 183 days for tax residency?

Count every day you are physically present in the country during the relevant period, and in most jurisdictions that includes partial days such as arrival and departure days. The period is usually the calendar year or the local tax year, though some countries and many tax treaties use any 12-month window instead. Each country defines its own counting rules, so check the specific rule before relying on a total.

Is the 183-day rule based on a calendar year or any 12 months?

It depends on the country. Many count days within the calendar year or their own tax year, while others, and many tax treaties, apply the threshold to any rolling 12-month period. The calculator above supports both modes, so you can check whichever is stricter for your situation.

Do partial days count toward the 183 days?

Usually yes. Most countries count any day you are present at any moment, including arrival and departure days, as a full day of presence, and this calculator counts them that way. Some jurisdictions carve out exceptions, for example short transit stops, so check the local rule if a few days decide your result.

Does spending 183 days in a country automatically make me a tax resident?

No, not automatically. The day count is one test among several: many countries also look at a permanent home, your center of vital interests, habitual abode, or nationality, and some treat you as resident with far fewer than 183 days. Passing 183 days is a strong indicator that a country may claim you, not the whole answer.

Can I be a tax resident of two countries at once?

Yes, under domestic law two countries can both treat you as a tax resident in the same year. If the countries have a tax treaty, its tie-breaker rules assign a single residency for treaty purposes, usually by permanent home, center of vital interests, habitual abode, then nationality. Without a treaty, double residency can mean obligations in both places.

Know your margin before it matters.

Staydays counts your days in every country automatically and alerts you before a residency threshold. Nothing to type after a trip.

Download on theApp Store Read the 183-day rule guide