What counts as a day for tax residency
Most countries build a day count into the test of where you are tax resident, yet 2 countries can count the same trip differently, because each law defines a day its own way. Before you compare a total with the 183-day rule or any other threshold, find out which of 4 methods the country uses:
- At midnight. A day counts only if you are in the country at the end of it, as in the UK. Portugal similarly counts a day only if it includes an overnight stay (CIRS, article 16).
- Any part of a day. Landing at 11 p.m. still counts as a full day, as in Ireland, the US and Georgia (Andersen Georgia). In the Index data, Czechia counts every started day, and Armenia, Colombia and Estonia count both arrival and departure days.
- Arrival in, departure out. Cyprus counts the day you arrive but not the day you leave.
- Full 24-hour days. The US foreign earned income exclusion counts only complete days abroad, midnight to midnight.
The UK midnight rule
Under the UK statutory residence test, a day counts if you are in the UK at the end of it (Finance Act 2013, Schedule 45, paragraph 22). Fly in on Friday evening and out on Monday morning and you have spent 3 UK days; a day trip that ends before midnight counts as 0.
That number feeds the UK statutory residence test: 183 days or more in the tax year makes you automatically resident, fewer than 16 (or 46 if you were not UK resident in any of the previous 3 tax years) automatically non-resident; in between, the other automatic tests (an only home in the UK, full-time work in the UK, or full-time work abroad with fewer than 91 UK days) come first, and if none applies your UK ties decide (GOV.UK).
There is a backstop for former residents. With at least 3 UK ties and UK residence in 1 of the previous 3 tax years, every day after the 30th on which you are in the UK but gone by midnight, departure days included, counts as a UK day (paragraph 23).
Leaving before midnight stops working after 30 days
Take a UK leaver, resident in 1 of the last 3 tax years, with exactly 3 UK ties. In the tax year from April 6, 2026, they make 4 stays of 10 nights and 36 same-day trips for meetings. Midnights alone give 40 days, and below 46 a leaver needs 4 ties to be resident (paragraph 18). But the 4 departure days and 36 day trips make 40 days without a midnight: the 10 past the 30th are deemed UK days, the total reaches 50, and from 46 days 3 ties are enough. UK resident.
Part days: when any time in the country counts
Ireland counts you as present for a day if you are in the country for any part of it, in a tax year that runs from January 1 to December 31 (Revenue). The US substantial presence test does the same: a day counts if you are physically present at any time during it (IRS).
So travel days add up: the Friday-to-Monday trip is 4 Irish or US days, and a day trip counts as 1.
Arrival and departure days: the Cyprus split
Cyprus takes a middle path, with the same rules for its 183-day and 60-day tests (PwC, Cyprus residence):
- The day you arrive counts as a day in Cyprus.
- The day you leave counts as a day outside Cyprus.
- Arriving and leaving on the same day counts as 1 day in Cyprus.
- Leaving and coming back on the same day counts as 1 day outside Cyprus.
The last rule matters on the Cyprus 60-day route, where the margin is thin: a morning flight out and an evening flight back makes that date a day outside Cyprus.
For the same year of travel, the UK, Cyprus, Irish and US rules give totals from 60 to 95 days:
Source: Each country's rule, listed under Sources, applied to 1 sample itinerary A worked example, not data about real travelers. UK: 3 midnights per weekend; the deeming rule adds the 5 days past the 30th on which the traveler was in the UK but gone by midnight (20 Monday departures and 15 day trips). Cyprus: 3 days per weekend, 1 per day trip. Ireland and the US: 4 per weekend, 1 per day trip.
Show the numbers
| Days counted | |
|---|---|
| UK, midnight rule | 60 days |
| UK, with the deeming rule | 65 days |
| Cyprus, arrival in and departure out | 75 days |
| Ireland, any part of a day | 95 days |
| US, any part of a day | 95 days |
Transit, layovers and days you could not leave
Most day counts leave out passengers who are only passing through, but each country draws the line differently:
- UK: a day does not count if you arrive as a passenger, leave the next day and do nothing substantially unrelated to the journey (paragraph 22).
- Ireland: you are not present while you stay airside (Revenue).
- US: you are not present while in transit between 2 places outside the US for under 24 hours (IRS).
- Georgia: transit time does not count as presence, according to the Index data.
An overnight connection through London: left out or counted
Left out
You land at Heathrow at 9 p.m. from Lisbon, sleep at an airport hotel and fly on to Dubai at 8 a.m. You arrived as a passenger, left the next day and did nothing else, so the night is not a UK day.
Counted
Same flights, but you take the train into London for a client dinner first. The dinner has nothing to do with the journey, so the transit exception falls away and the night counts.
Forced stays get relief too. The UK leaves out up to 60 days a tax year when exceptional circumstances beyond your control, such as a sudden or life-threatening illness, keep you there while you mean to leave (paragraph 22). Ireland does not count the day after your planned departure when only an unforeseen event, such as severe weather or an aircraft breakdown, stops you leaving on time (Revenue). Keep the cancellation email or the doctor's note.
Trips abroad that still count, and the US 330-day test
Some countries add days back. Spain counts sporadic absences as days in Spain unless you prove tax residence elsewhere (LIRPF, article 9), and in the Index data Georgia counts trips abroad for treatment, leisure, business or study as days in Georgia.
The US foreign earned income exclusion counts the other way. Its physical presence test needs 330 full days abroad in any 12 consecutive months (IRS, physical presence test). The days you fly out of and back into the US are never full days abroad, and a trip between foreign countries over international waters loses full days only if it takes 24 hours or more. The 330 days need not be consecutive and the 12-month window can start on any day, so US expats using the physical presence test can slide the window to fit their travel.
Tax year, rolling 12 months or several years
Each total is measured over a set period, and countries use 3 kinds:
- A tax year. Spain, Ireland and Czechia count the calendar year, the UK April 6 to April 5 (GOV.UK), and in the Index data Hong Kong April 1 to March 31 and Mauritius July 1 to June 30.
- A rolling window. Portugal counts any 12 months starting or ending in the tax year (CIRS, article 16), the UAE any 12 consecutive months (Cabinet Decision No. 85 of 2022, article 4), Georgia any 12 months ending in the year, and Colombia any 365 consecutive days. A rolling window never resets on January 1, so check it before every long stay.
- Several years. Ireland adds this year's and last year's days and makes you resident at 280, leaving out a year with 30 days or fewer (Revenue). Mauritius adds 3 income years and makes you resident at 270.
Spread evenly, the multi-year tests catch fewer days a year than 183:
Source: Nomad Tax Index data: each country's statute or tax authority, linked on its country page Each total divided evenly across its years and rounded up. Malaysia's 90 days apply after 3 of the 4 previous years as a resident or with 90 days or more.
Show the numbers
| Days a year | |
|---|---|
| Single-year test (183 days) | 183 days |
| Hong Kong certificate (more than 300 days over 2 years) | 151 days |
| Ireland (280 days over 2 years) | 140 days |
| Mauritius (270 days over 3 income years) | 90 days |
| Malaysia (90 days, after 3 of the 4 previous years) | 90 days |
| 2025, days in Ireland2-year total 150: not resident | 150 days |
|---|---|
| 2026, days in Ireland2-year total 280: resident | 130 days |
| Most 2026 days that stay non-resident2-year total 279 | 129 days |
| Result for 2026 | Irish resident under the 280-day test |
No Irish days in 2024. A year with 30 days or fewer is left out of the test.
The window also decides when residency starts. In the Index data, Spain and Georgia make you resident for the full tax year, Colombia from the second year when the 365 days span 2, and Estonia from your day of arrival; the UK can split the year you arrive or leave (GOV.UK).
Day-counting rules by country
The counting rules for 11 countries, side by side:
Sources: listed below (October 12, 2026), except Colombia, Estonia, Czechia and Georgia's period and trips abroad, from the Nomad Tax Index data (September 29, 2026), each statute linked on its country page.
| Country | Period counted | How a day counts | Exceptions and other rules |
|---|---|---|---|
| United Kingdom | Tax year from April 6 | In the UK at midnight | Transit to the next day; up to 60 forced days; day visits past 30 for some leavers |
| Ireland | Calendar year; 280 days over 2 years | Any part of a day | Airside time; the day after a departure stopped by unforeseen events |
| United States | Calendar year, weighted over 3 years | Any time during the day | Transit under 24 hours; commuting from Canada or Mexico |
| Cyprus | Calendar year | Arrival day in, departure day out | Same-day visit: 1 day in; same-day trip out: 1 day outside |
| Spain | Calendar year | Days present | Sporadic absences count unless you prove residence elsewhere |
| Portugal | Any 12 months starting or ending in the year | Any full or partial day that includes a night in Portugal | A home kept as your habitual residence needs no day count |
| Georgia | Any 12 months ending in the year | Any part of a day | Trips abroad for treatment, leisure, business or study count; transit and stays in Georgia for treatment or leisure do not |
| Colombia | Any 365 consecutive days | Arrival and departure days count | A period across 2 years makes you resident from the second |
| Estonia | 12 consecutive calendar months | Arrival and departure days count | Resident from the day of arrival |
| Czechia | Calendar year | Every started day | Stays only for study or medical treatment do not make you resident |
| Greece | Any 12 months | Days present, more than 183 in total, consecutive or not | Resident from the first day of presence; stays only for tourism or medical reasons of up to 365 days (short trips abroad included) do not count |
Visa days and tax days are counted separately
Immigration counts run on their own clock. The Schengen short-stay limit of 90 days in any 180 adds up your days in every Schengen country together (European Commission), so 60 days in Portugal and 30 in Spain within 180 days use up the allowance while leaving each tax count far below 183. A remote work permit's allowed stay says nothing about when tax residency starts either, so what a digital nomad visa means for your tax comes down to the host country's own test: Thailand makes you resident at 180 days in the tax year whatever visa you hold (Revenue Department, Guide to P.N.D. 90).
Counting days in several countries at once
Because each country uses its own rule, the same date can count in 2 countries. Fly from Dublin to London at 6 p.m. and it is an Irish day for the afternoon and a UK day for the midnight. Enough of those and you can pass the line in both countries, leaving dual tax residency to a treaty's tie-breaker.
A plan to be resident nowhere, the perpetual traveler approach, has to pass every country's rule at once: a tracker that counts nights undercounts Ireland and the US, and one that counts calendar days overcounts the UK and Portugal.
How to track your days for tax residency
Track the count from records made at the time, not from memory, and give each date the facts the rules turn on:
Columns for a day log that holds up
- The date and the country you were in at midnight.
- Every other country you were in that day, with times.
- The reason when a rule cares: transit, a forced stay, medical treatment, study or business.
- Whether you left the airport on a connection.
- The evidence: boarding pass, booking reference, receipt or lease.
- A running total per country under its own rule and window.
Behind the log, keep boarding passes and e-tickets as files, photos of each stamped passport page, leases and hotel invoices, card statements that show the city of each payment, and a tax residency certificate from the country where you are resident.
David's note
I would log every day under the broadest rule, any part of a day, with the midnight location next to it. That log converts to the midnight rule or the Cyprus split in minutes; a log of nights never converts back, and the dates at the margin are the ones a tax office asks about.
