Tax Residency vs Domicile: What's the Difference?

Tax residency and domicile are two different concepts that travelers constantly confuse. Tax residency is a year-by-year status, usually decided by how many days you spend in a country plus your personal ties. You can be tax resident in two or more countries in the same year. Domicile is your long-term permanent home under common law - the place you intend to settle indefinitely. You can hold only one domicile at a time, and it persists even while you live abroad. Residency tells a country whether to tax your income this year. Domicile historically shaped inheritance tax and the UK remittance basis, though the UK replaced its domicile-based rules with a residence-based system from 6 April 2025.

Most digital nomads treat "where I live" as one simple question. Tax authorities split it into two. The first is residency, a recurring test that resets each tax year. The second is domicile, a sticky legal concept that follows you across borders for decades.

The distinction matters because the two statuses trigger different taxes. Residency decides whether a country taxes your worldwide income or only the income you earn there. Domicile, in the countries that still use it, decides things like inheritance tax and which long-term tax regime you fall under.

This post covers what each term means, how authorities decide them, who they apply to, and the mistakes that cost nomads money. We use the UK, US, and OECD treaty framework as the main reference points, since they define these concepts most clearly.

How tax residency and domicile differ

Tax residency is a snapshot test focused on a single tax year, while domicile is a holistic test that weighs your entire life and intentions. That is the core difference. Residency answers "where did you live this year?" Domicile answers "where is your permanent home?"

Tax residency is usually triggered by physical presence. The UK uses the Statutory Residence Test, where day counts and connecting factors determine status for each tax year (6 April to 5 April). The US uses two tests: the green card test and the substantial presence test, both measured over the calendar year, according to the IRS guidance on determining residency status. You can satisfy residency rules in more than one country at once.

Domicile works differently. Under UK common law, you acquire a domicile of origin at birth, usually from your father, and it persists until you replace it with a domicile of choice elsewhere. You can never be without a domicile, and you can only have one at a time, per the GOV.UK RDR1 guidance on residence and domicile.

Example: Priya, a dual concept in one year

Priya was born in India to Indian parents, giving her an Indian domicile of origin. In the 2026/27 UK tax year she spends 200 days in London for a contract. Under the Statutory Residence Test, the day count plus her UK home make her UK tax resident for that year. Her domicile, however, stays Indian, because she intends to return to Mumbai and has not settled in the UK permanently. So in a single year Priya is UK tax resident but non-UK domiciled. Her residency triggers UK income tax on her worldwide income, while her domicile of origin remains unchanged.

The three types of domicile

Domicile comes in three forms under common law: domicile of origin, domicile of choice, and domicile of dependence. Each is acquired differently, and only one applies to you at any moment.

Domicile of origin is assigned at birth, normally taking the domicile of your father (or mother, if your parents were not married). It is the default that revives if any later domicile is abandoned without a replacement.

Domicile of choice can be acquired from age 16. To claim it, you must settle in a new country with the genuine intention of living there permanently or indefinitely, not just temporarily, according to the GOV.UK RDR1 guidance. Buying a holiday home or staying a few years is not enough on its own.

Domicile of dependence applies to people who lack legal capacity to choose, such as children. Their domicile follows the person they legally depend on, usually a parent, until they reach the age to acquire their own.

Changing domicile of choice is hard. Tax authorities look for a clear break: selling your old home, cutting social and economic ties, and proving you never intend to return. Many nomads who think they have shed their original domicile have not, because their intention to settle elsewhere is not strong enough to prove.

Who tax residency and domicile apply to

Tax residency applies to almost everyone who spends meaningful time in a country, regardless of nationality. Domicile applies as a tax concept mainly in common-law countries like the UK and Ireland, and in certain US states.

For residency, the relevant tests vary by country. The US treats you as a resident for tax purposes if you meet the green card test or the substantial presence test, per the IRS substantial presence test page. The test counts all days in the current year, plus one-third of days in the prior year, plus one-sixth of days in the year before that. Hit 31 days this year and 183 across the three-year formula, and you are a US tax resident.

Domicile matters most for a narrower group. In the US, state tax often turns on domicile rather than physical presence. States such as California can tax someone who is domiciled there even during a year they spend mostly abroad, while presence-based states like New York generally tax only the days you actually work or live there.

The UK historically used domicile to operate the non-dom remittance basis. That changed from 6 April 2025, when the UK replaced domicile with a residence-based system for income tax, capital gains tax, and inheritance tax. New arrivals who have not been UK resident in the prior 10 years can now use a four-year Foreign Income and Gains regime instead. If you previously relied on non-dom status, this is a structural shift worth checking against current HMRC guidance. We cover the underlying day-counting in our guide to the UK Statutory Residence Test.

How treaties break a residency tie

When two countries both claim you as a tax resident, a double-tax treaty usually settles it with a tie-breaker, and domicile is not the deciding factor. Most treaties follow the OECD Model Tax Convention's Article 4, which applies a fixed sequence of tests until one country wins.

The sequence runs: permanent home, then centre of vital interests, then habitual abode, then nationality, then mutual agreement between the two tax authorities. The OECD Model Tax Convention defines a permanent home as a dwelling continuously available to you, not a hotel room or short let.

Notice that "permanent home" in a treaty is not the same as "domicile." A treaty looks at where you actually have a home available and where your life is centred this year, not your lifelong intended home. A nomad with no fixed home anywhere falls through to the habitual abode and nationality tests. We break this down further in our guide to OECD tax treaty tie-breaker rules.

Common mistakes travelers make

Assuming leaving a country ends your domicile. Domicile of origin is sticky. Moving abroad, even for years, does not change it unless you settle permanently somewhere new and prove you will not return. Many expats wrongly assume a few years overseas reset their domicile.

Confusing tax residency with citizenship. Your passport does not set your tax residency. A US citizen is taxed on worldwide income regardless of where they live, but that is a citizenship-based rule, separate from both residency and domicile. Most other countries tax on residency, not nationality.

Thinking you can only be resident in one country. You can be tax resident in two or more countries in the same year. That is exactly why treaty tie-breakers exist. Counting on a single residency leaves nomads exposed to surprise dual claims.

Ignoring US state domicile after moving abroad. Leaving the US does not automatically end state tax obligations. Domicile states keep taxing you until you establish a new domicile and cut ties. Nomads from California or New York often miss this.

Treating the UK's 2025 changes as no change. The UK abolished the domicile-based remittance basis from 6 April 2025. Anyone who built a plan around non-dom status needs to reassess under the new residence-based regime rather than assume old rules apply.

How Nomad tracks this

Nomad (the visa compliance app for digital nomads) tracks the day counts that drive tax residency across every country you visit. Residency tests like the US substantial presence test and the UK Statutory Residence Test both hinge on accurate day totals, and miscounting by a few days can flip your status. Nomad logs your entries and exits automatically and shows running totals per country, so you can see when you are approaching a 183-day or treaty threshold.

The app keeps passport details on your device for privacy and only syncs travel dates and countries to the cloud. The in-app AI assistant answers plain-English questions about residency thresholds and what your day counts mean. Nomad does not determine domicile, which is a legal question for a qualified adviser, but it gives you the day data those conversations depend on.

Download Nomad on the App Store

Frequently Asked Questions

What is the difference between tax residency and domicile?

Tax residency is a year-by-year status, usually decided by how many days you spend in a country plus your personal ties, and you can be resident in several countries at once. Domicile is your long-term permanent home under common law, the place you intend to settle indefinitely, and you can hold only one at a time. Residency decides whether a country taxes your income this year. Domicile historically shaped inheritance tax and special regimes like the UK's former non-dom remittance basis.

Can I be tax resident in one country and domiciled in another?

Yes. This is common for digital nomads and expats. You might spend enough days in the UK to become UK tax resident for a year while keeping a domicile of origin in your birth country, because you still intend to return there permanently. Residency follows your physical presence and ties for the current tax year. Domicile follows your lifelong intention about where your permanent home is. The two statuses are decided by separate tests and frequently point to different countries.

Does domicile still matter for UK tax after April 2025?

Domicile no longer determines UK tax liability for income tax, capital gains tax, or inheritance tax from 6 April 2025. The UK replaced its domicile-based system, including the non-dom remittance basis, with residence-based rules. New arrivals who were not UK resident in the prior 10 years can use a four-year Foreign Income and Gains regime instead. Domicile may still matter under other countries' laws and for some legal purposes, so verify your situation against current HMRC guidance or a tax adviser.

How do I change my domicile?

Changing your domicile of choice requires settling in a new country with a genuine intention to live there permanently or indefinitely, plus cutting ties to your previous domicile. That usually means selling your old home, relocating your family and finances, and showing you do not intend to return. Simply living abroad for a few years is not enough. Domicile of origin revives if you abandon a domicile of choice without establishing another. Because it is hard to prove, get professional advice before relying on a domicile change.

Which one decides whether a country taxes my worldwide income?

Tax residency decides whether a country taxes your worldwide income or only income earned there. Residents typically pay tax on global income, while non-residents pay only on local-source income. Domicile generally does not control this, with the historical UK non-dom regime being the main exception before April 2025. If two countries both treat you as resident, a double-tax treaty tie-breaker, based on the OECD model, decides which one wins, using permanent home and centre of vital interests rather than domicile.

About Nomad

Nomad is the visa compliance app for digital nomads. Built by nomads for nomads, it tracks your days across every country automatically, alerts you before overstays, and keeps passport details on your device for privacy. The in-app AI assistant answers visa questions in plain English. Available on iOS.

Download Nomad on the App Store →

Important: This content is informational and does not constitute legal, tax, or immigration advice. Visa rules, tax regulations, and entry requirements change frequently and vary by individual circumstances. Always verify current requirements with official government sources or a qualified professional before making travel decisions. Nomad tracks your days and surfaces compliance information, but final responsibility for compliance rests with the traveler.