Tax Residency vs Domicile vs Residence Permit: What Each One Means and Where They Conflict

Step 1: The three concepts side by side

People use "resident" for three different things, and the confusion is expensive. A tax resident owes tax on worldwide income to a country for a year. A person's domicile is the one place they treat as their permanent home. A residence permit is immigration permission to live somewhere. Different authorities run each test, with different evidence and different calendars — so the answer to "where do I live?" can be three different countries at once.

The practical consequence: leaving a country rarely ends all three at the same moment. Your permit can lapse while you are still tax resident; your tax residency can end while your old domicile keeps a state or estate tax claim alive; and a new permit does not make you tax resident anywhere by itself. The rest of this guide takes each concept in turn and then shows where they collide.

Step 2: Tax residency — where you are taxed

Tax residency is decided country by country, each under its own domestic law; there is no international definition that binds them. Most tests combine a day count with ties — a home, family, work or economic interests. The basics are in what is tax residency?

The 183-day rule

Spending more than half the year in a country — usually 183 days — is the most common trigger, but the details differ: some countries count a calendar year, some their own tax year, some any rolling 12 months, and they disagree on whether arrival and departure days count. And 183 days is a sufficient condition in many places, not a necessary one: a home or family can make you resident with far fewer days. See what is the 183-day rule? and check a year of trips with the 183-day calculator.

United Kingdom: the Statutory Residence Test

The UK's Statutory Residence Test (SRT) runs over the tax year from 6 April to 5 April in a fixed order:

1. 1Automatic overseas tests — you are not UK resident if you spent fewer than 16 days in the UK (fewer than 46 if you were not UK resident in any of the previous 3 tax years), or you worked full-time abroad with fewer than 91 UK days and fewer than 31 days working more than 3 hours in the UK.
2. 2Automatic UK tests — you are UK resident if you spent 183 days or more in the UK; if you had a UK home for a period of at least 91 consecutive days (at least 30 of them in the tax year), spent at least 30 days there, and had no overseas home or spent fewer than 30 days in the tax year at each one; or if you worked full-time in the UK for a 365-day period falling partly in the tax year.
3. 3Sufficient ties test — if neither applies, your days are weighed against your ties: family, accommodation, work, more than 90 days in a previous year, and (for people leaving) spending more days in the UK than in any other country. The more ties, the fewer days it takes.

The full rule, flowchart and examples are on UK tax residency: the Statutory Residence Test; the ties are explained in what is the sufficient ties test?, and split-year treatment covers the year you arrive or leave. Try your own facts in the UK SRT calculator.

United States: citizenship, the green card and the Substantial Presence Test

The US taxes its citizens on worldwide income wherever they live. A non-citizen is a US tax resident under the green card test — holding lawful permanent resident status at any time in the calendar year — or the Substantial Presence Test: at least 31 days in the current year and 183 days over three years, counting all days this year, one-third of last year's and one-sixth of the year before. Details and exceptions are on the Substantial Presence Test, and the SPT calculator does the weighting for you. The green card test is the clearest case of immigration status creating tax residency — more on that in Step 4.

Resident in two countries: treaty tie-breakers

Because each country applies its own law, being tax resident in two countries in the same year is common — see can you be tax resident in two countries? Where a tax treaty exists, its residence article — modelled on Article 4(2) of the OECD Model Tax Convention — assigns you to one country for treaty purposes, testing in order:

1. 1Permanent home — where you have a permanent home available to you.
2. 2Centre of vital interests — if you have a home in both, where your personal and economic relations are closer.
3. 3Habitual abode — if that cannot be decided, or you have a home in neither, where you habitually live.
4. 4Nationality — if you have a habitual abode in both or neither.
5. 5Mutual agreement — if you are a national of both or neither, the two tax authorities settle it.

The tie-breaker only allocates taxing rights under the treaty; it does not erase the other country's domestic residence, and you may still have to file there and claim treaty relief. A tax residency certificate is how you prove the result to a foreign payer or tax office.

Step 3: Domicile — your permanent legal home

Domicile is a common-law idea: the place you treat as your permanent home and intend to return to. You get a domicile of origin at birth — under UK law, your father's domicile when you were born if your parents were married, or your mother's if they were not or she was widowed before your birth — and can replace it with a domicile of choice only by actually moving and intending to stay indefinitely. You have one domicile at a time, and the old one persists until the new one is proved. That makes domicile sticky in a way tax residency is not.

UK: from domicile to residence on 6 April 2025

For decades the UK used domicile to tax foreigners lightly: a UK resident who was domiciled abroad could use the remittance basis and pay UK tax only on foreign income and gains brought into the UK. That ended on 6 April 2025. 2024-25 was the last year a remittance basis claim could be made, and from 2025-26 every UK resident is taxed on worldwide income and gains as they arise. Two residence-based rules replaced it:

• The 4-year FIG regime. Someone who becomes UK resident after at least 10 consecutive tax years of non-UK residence can claim relief on foreign income and gains for their first 4 tax years of UK residence. The claim is made year by year on the Self Assessment return, unused years cannot be carried forward, and nationality and domicile are irrelevant to eligibility.
• Long-term UK residence for inheritance tax. Non-UK assets are within UK inheritance tax if you are a long-term UK resident: UK resident for at least 10 of the previous 20 tax years (IHTA 1984 s 6A). After you leave, you stay in scope for a tail of 3 tax years if you were resident for 13 or fewer of the 20 years, rising by one year for each further resident year to a maximum of 10 tax years after 20 years of residence. Ten consecutive non-resident years resets the test.

Domicile has not vanished entirely: HMRC says it remains relevant for deaths and lifetime transfers before 6 April 2025, under certain inheritance tax treaties that use the common-law concept, and for some trust charges under transitional rules. There is also a transitional rule for people who are non-resident in 2025-26 and do not return: if they were neither UK domiciled nor deemed domiciled on 30 October 2024 they are not long-term UK residents, and if they were deemed domiciled on that date their status ends after 3 years of non-residence. For everyone arriving or leaving now, though, the number that matters is UK-resident tax years — which is decided by the SRT, which is decided by days and ties.

US states: domicile plus a day-count backstop

US federal income tax does not use domicile, but US states do. New York taxes you as a resident if New York is your domicile, or — even if it is not — if you maintain a permanent place of abode there for substantially all of the year and spend 184 days or more in the state, where any part of a day counts as a day. New York's own definition says you can have only one domicile, and that a New York domicile does not change until you show you have abandoned it and established a new one. See the New York 183-day rule.

Florida has no personal income tax and so no day test. What it offers is evidence: a sworn Declaration of Domicile under Fla. Stat. § 222.17, filed with the clerk of the circuit court, alongside homestead, a Florida driver license and voter registration. The declaration records intent; it does not change your domicile by itself. See establishing Florida domicile and how long it takes to establish residency.

Step 4: Residence permits — permission to live there

A residence permit answers an immigration question only: may you live in this country? Tax authorities generally ignore it, and immigration authorities generally ignore your tax residency. What permits do have is absence limits — usually measured as one continuous absence, not a yearly total — and when you breach one, the permit often ends automatically.

• Germany — 6 months. A residence title expires if you leave for a reason that is not temporary, or if you do not return within 6 months or a longer period set by the Ausländerbehörde before you go (§ 51(1) Nr. 6 and 7 AufenthG). The EU Blue Card has 12 months. See the German 6-month absence rule.
• Qatar — 6 months. A resident may not stay outside Qatar continuously for more than 6 months unless they obtain permission to return, before leaving or within a year of departure (Law No. 21 of 2015, Article 14). See the Qatar 6-month absence rule.
• EU long-term residents — 12 months. Under Article 9(1)(c) of Directive 2003/109/EC, status is lost after 12 consecutive months outside the EU, although Article 9(2) lets member states allow longer absences. The Court of Justice held in Case C-432/20 that any physical presence in the EU during that period, even a few days, prevents the loss. See the Dutch EU long-term resident rule.
• UK indefinite leave to remain — 2 years. ILR lapses automatically after a continuous absence of more than 2 years outside the UK and Islands; the way back is a Returning Resident visa. See the ILR 2-year lapse rule.
• US green card — about 1 year. USCIS uses an absence of more than a year as a general guide to abandonment, can find abandonment on shorter trips, and advises a reentry permit before any absence over a year. See the green card absence rule.

Step 5: Where they conflict — three worked examples

These examples are simplified illustrations of how the rules interact, not advice on any particular case.

Example 1 — the UK leaver who assumes domicile still protects them

Sarah was born in the UK and has lived there all her life. In August 2026 she moves to Portugal, sells her London flat, and keeps a UK investment portfolio and close family in London. Under the old rules her advisers would have discussed whether and when she had acquired a Portuguese domicile of choice. Under the rules in force since 6 April 2025, that question no longer decides inheritance tax.

• Income tax: 2026-27 is a UK-resident year (possibly split under split-year treatment). From 2027-28 she is non-resident only if each year's SRT says so — with family and, if she keeps using a UK home, accommodation ties, return visits can quickly push her back over the line.
• Inheritance tax: she was UK resident for all 20 of the last 20 tax years, so she remains a long-term UK resident — and her worldwide assets remain within UK inheritance tax — until she has been non-resident for 10 consecutive tax years.
• The lesson: what used to be a debate about intent is now a count of UK-resident tax years. Every year she drifts back into UK residence restarts the tail, so the SRT day count matters for estate planning as well as income tax.

Example 2 — the New York to Florida mover audited on days

David sells his business, buys a home in Palm Beach in February 2026, files a Declaration of Domicile, swaps his driver license and registers to vote in Florida. He keeps his Manhattan apartment "for visits". New York audits 2026 and rebuilds his calendar from card statements, phone records and travel data.

• If the audit finds 190 New York days: his domicile may well have moved to Florida, but with a permanent place of abode and 184 days or more in the state he is a New York statutory resident for 2026 and taxed on worldwide income as a resident anyway. Any part of a day counts, so waking up in Manhattan before a morning flight to Florida makes it a New York day; only presence solely to board a flight or to travel through the state is disregarded.
• If the audit finds 160 days: the statutory test fails, and New York must instead argue he never changed domicile — weighing his homes, business ties, family and where his most treasured possessions are. The Florida paperwork helps; the bigger, more personal home staying in Manhattan hurts.
• The lesson: domicile and the day count are separate tests and he must pass both. The days are the part he can prove objectively — if he logged them at the time.

Example 3 — the permit holder who is tax resident elsewhere and loses the permit

Priya, an Indian national, holds a German residence permit (Aufenthaltserlaubnis) for work and rents a flat in Munich. Her employer sends her to Bengaluru for 8 months to set up an office. She keeps the Munich flat and assumes that, since she still pays German tax, her German status is safe.

• India: with 182 days or more in India in the Indian tax year (1 April–31 March) she becomes Indian tax resident — see India's 182-day rule.
• Germany (tax): keeping a dwelling she can use means she still has a German residence for tax purposes, so she can remain German tax resident as well — see German tax residency. She is a dual resident, and the residence article of the Germany–India tax treaty decides which country has primary taxing rights — a tie-breaker that, like the OECD Model, looks first at where she has a permanent home available.
• Germany (immigration): none of that helps the permit. Unless the Ausländerbehörde set a longer period before she left, her residence title expired automatically once she had been away more than 6 months (§ 51(1) Nr. 7 AufenthG) — while she was still paying German tax.
• The lesson: tax residency and permit status move independently. Ask the immigration authority for a longer absence period before a long trip, and track the permit's absence clock separately from any tax day count.

Step 6: Keeping all three in order

The three tests share one input: where you were on each day. Tax residency counts days in a tax year, a former state counts days against its statutory test, and each permit counts the length of your longest absence. A single log, kept as you travel, answers all of them:

1. 1List every country (and, for US movers, every state) you hold a tax filing, permit or domicile connection with.
2. 2For each, note the test and the window: tax year and day threshold, statutory residence test, or maximum continuous absence.
3. 3Record every night's location as it happens, with arrival and departure days counted the way each authority counts them.
4. 4Before any long trip, check the permit's absence limit and whether you need a re-entry permit or an extended period approved in advance.
5. 5At year end, run each tax residency test, check for dual residence and the treaty tie-breaker, and keep the evidence for audits that may come years later.

The Bounded app records the days automatically, keeps separate counters for tax thresholds and permit absence limits, and warns before you cross one. For a quick check of past years, use the 183-day calculator, the UK SRT calculator or the Substantial Presence Test calculator. This guide describes the rules; it is not tax or immigration advice, and cross-border cases with significant assets deserve a qualified adviser in each country.

Sources

• HMRC — RDR3: Statutory Residence Test (SRT) guidance
• Finance Act 2013, Schedule 45, paragraph 8 — second automatic UK test (UK home)
• HMRC — Residence and FIG Regime Manual, RFIG41000 (FIG regime introduction)
• GOV.UK — Check if you can claim the 4-year foreign income and gains regime
• GOV.UK — Inheritance Tax if you're a long-term UK resident
• HMRC — Inheritance Tax Manual, IHTM47001 (long-term UK residence test and when domicile remains relevant)
• Finance Act 2025, section 44 — IHTA 1984 s 6A (long-term UK resident)
• IRS — Substantial Presence Test
• IRS — U.S. tax residency: Green card test
• IRS — Instructions for Form 706-NA (domicile for estate tax)
• 26 CFR 20.0-1(b)(1) — definition of resident (domicile) for US estate tax
• HMRC — Residence, Domicile and Remittance Basis Manual, RDRM22100 (domicile of origin)
• NY Dept. of Taxation and Finance — Income tax definitions (domicile, permanent place of abode, resident)
• 20 NYCRR 105.20 — New York resident individual; rules for counting days (c)
• Florida Legislature — Florida Statutes online (§ 222.17, Declaration of Domicile)
• OECD — Model Tax Convention on Income and on Capital, Article 4 (Resident)
• Income Tax Department (India) — India–Germany DTAA, Article 4 (Resident)
• EUR-Lex — Council Directive 2003/109/EC (Art. 4(3), Art. 9)
• CJEU — Case C-432/20, ZK (Landeshauptmann von Wien), judgment of 20 January 2022
• Al Meezan (Qatar Legal Portal) — Law No. 21 of 2015 on the entry, exit and residence of expatriates, Article 14 (Arabic text)
• Immigration (Leave to Enter and Remain) Order 2000, Article 13 — lapsing of leave
• Aufenthaltsgesetz § 51 — expiry of residence titles (Germany)
• USCIS — International travel as a permanent resident