Is there a 183-day rule? What day counts really decide

What this covers

The phrase 183-day rule usually means a day count of about half a year that makes a person tax resident in a country. In practice each country writes its own version. Some count days in a calendar year, some in their own tax year, some in any rolling 12-month period, and the United States uses a weighted three-year formula. Countries also differ on what counts as a day. Tax treaties add a separate 183-day test for where wages can be taxed, which is not a residence test at all.

Understand why 183 days is not one rule

Each country writes its own residence rules. The European Commission's Your Europe guidance says each country has its own definition of tax residence. It adds that two countries can consider you resident at the same time.

A day count is usually one test among several. Many countries also look at where you have a home, where your family lives, or where your economic interests sit. Meeting none of the day tests does not end the question if another test applies.

The number 183 also appears in tax treaties, but for a different purpose. Article 15(2) of the OECD Model Tax Convention uses a period not exceeding 183 days in any twelve-month period as one of three conditions for wages earned abroad to be taxed only in the worker's home country. That is a rule about who taxes employment income, not about where you are resident.

Compare how countries count days

The table shows how several official sources describe their day tests. Each test sits next to other tests not shown in the table. Use the day ledger to keep a record you can take to a professional.

Check what counts as a day in each country

Countries do not agree on what a day of presence is. A trip that counts as one day in one country can count as two days or none in another.

In the UK, HMRC's manual says a person has spent a day in the UK if they are here at the end of the day, at midnight. A transit day can be left out when a passenger arrives on the way to another country outside the UK, leaves the next day, and does nothing substantially unrelated to the journey. A deeming rule can also count days without a midnight. It applies when someone was UK resident in one or more of the previous three tax years, has three or more UK ties, and was present on more than 30 days without being here at midnight.

New Zealand's Inland Revenue says parts of days, such as the day you arrive and the day you leave, count as whole days. UAE Ministerial Decision No. 27 of 2023 says all days or parts of a day of physical presence count. The ATO says its 183-day test counts all days physically present in Australia, including the days of arrival and departure.

Watch for rolling windows and weighted formulas

A calendar-year test resets on 1 January. A rolling test does not. New Zealand counts any 12-month period, so days at the end of one year and the start of the next can add up. Inland Revenue says residence is then backdated to the first of those days.

The US substantial presence test, which applies to people who are not US citizens, uses a weighted three-year count. The IRS says you count all days in the current year, one third of the days in the first prior year and one sixth of the days in the second prior year. You also need at least 31 days in the current year. Some days are excluded, such as certain days in transit and days as an exempt individual.

The IRS also describes a closer connection exception. It can apply to someone who meets the test but was present fewer than 183 days in the current year, kept a tax home in one foreign country for the whole year and had a closer connection to that country. It is claimed on Form 8840.

Look at ties tests that work without any day count

Several countries can treat you as resident with few days present, or none, if your home or interests are there.

Spain's Agencia Tributaria says a person is resident if the main base of their economic activities or interests is in Spain, directly or indirectly. That test does not need 183 days. New Zealand says a permanent place of abode is enough on its own, and a person with one stays resident even after a long absence. The UAE treats a person as resident if their usual or primary place of residence and the center of their financial and personal interests are in the UAE.

In the UK, the sufficient ties test lowers the number of days needed as your UK ties rise. HMRC's guidance note says the more UK ties you have, the fewer days you can spend in the UK before you become resident. For someone who was UK resident in one of the three previous tax years, more than 120 days with one tie can be enough.

Know what treaties do when two countries both count you

If two countries each treat you as resident under their own rules, a tax treaty between them may settle which one counts for the treaty. Article 4(2) of the OECD Model looks in order at a permanent home, the center of vital interests, habitual abode and nationality. If those fail, the two tax authorities settle it by mutual agreement. Day counts can matter under habitual abode, but they are not the first test.

A treaty decides residence only for that treaty. It does not rewrite either country's domestic rules for every purpose. The UAE decision says treaty conditions apply for the purposes of that treaty. Spain's Agencia Tributaria notes that its treaties refer back to domestic law, so two states can both consider the same person resident. See tax residency and the tie-breaker rule entry.

Common misconceptions

Questions to take to a professional

1. Which countries could treat me as resident this year under their own day tests and ties tests?
2. How does each of those countries count a day, including arrival, departure and transit days?
3. Does any country use a rolling window or multi-year formula that reaches days from last year?
4. Do I have a home, family, work or economic interests that could make me resident without a day count?
5. If two countries treat me as resident, is there a treaty, and how do its tie-breaker tests apply to my facts?
6. What records should I keep to show my days and my ties in each country?

Questions people ask

Sources

• Agencia Tributaria: Persona física residente en EspañaOfficial guidance
• RDR3: Statutory Residence Test (SRT) notesOfficial guidance
• RFIG20710 Statutory Residence Test (SRT): Days spent in the UK: Meaning of a day spent in the UKOfficial guidance
• RFIG20720 Statutory Residence Test (SRT): Days spent in the UK: The deeming ruleOfficial guidance
• RFIG20730 Statutory Residence Test (SRT): Days spent in the UK: Transit daysOfficial guidance
• Tax residency status for individuals (Inland Revenue)Official guidance
• Cabinet Decision No. 85 of 2022 on the Determination of Tax Residency (FTA unofficial translation)Primary law
• Ministerial Decision No. 27 of 2023 (FTA unofficial translation)Primary law
• Substantial presence testOfficial guidance
• Closer connection exception to the substantial presence testOfficial guidance
• Residency: the 183-day test (Australian Taxation Office)Official guidance
• Determining residency (Estonian Tax and Customs Board)Official guidance
• Your Europe: Income taxes abroadOfficial guidance
• Model Tax Convention on Income and on Capital: Condensed Version 2017 (OECD)Treaty text