Tax Residency vs Legal Residency

These are two different things

The single most important distinction for anyone pursuing international residency strategies:

Legal residency: Your right to live in a country. Granted by immigration authorities. Based on visa type, investment, employment, family ties, etc.

Tax residency: Where you are obligated to pay personal income tax. Determined by tax authorities. Based on physical presence, domicile, vital interests, and other connecting factors. Can be completely different from your legal residency.

You can be legally resident in Country A and tax-resident in Country B simultaneously. You can be legally resident in Country A but tax-resident in Country B because you spend most of your time there.

How countries determine tax residency

Most countries use one or more of the following tests:

Days in the country test: If you spend more than 183 days (6 months) in a tax year in a country, most countries automatically treat you as tax-resident there. Some countries have lower thresholds.

Permanent home test: If you maintain a permanent home in a country (i.e., a home that is available to you indefinitely, not just temporarily), that country may treat you as tax-resident there regardless of days spent.

Centre of vital interests: Where are your family, your social ties, your professional activities, your economic interests? Many countries use this as a primary tie-breaker when you have permanent homes in multiple countries.

Habitual abode: Where do you regularly stay? This is different from permanent home — it's about your actual physical presence pattern.

Domicile (UK-specific): A UK concept (different from residence) that determines certain UK tax obligations. UK domicile is complex and can apply even if you're not UK-resident.

The OECD Model Tax Convention tie-breaker rules

When two countries both claim someone as tax-resident (dual residency), bilateral double tax treaties use OECD-based tie-breaker rules to determine which country has primary taxing rights:

1. 1Permanent home: Tax-resident in the country where you have a permanent home. If both, move to #2.
2. 2Centre of vital interests: Tax-resident in the country with which your personal and economic ties are closer. If indeterminate, move to #3.
3. 3Habitual abode: Tax-resident in the country where you habitually live. If both, move to #4.
4. 4Nationality: Tax-resident in the country of citizenship. If both, move to #5.
5. 5Mutual agreement: The two countries' competent authorities resolve it bilaterally.

The practical lesson: Changing tax residency requires more than just getting a new visa. You need to genuinely shift your life — your home, your family, your economic activities — to the new country.

Exiting your home country's tax system

Most high-tax countries do not automatically accept that you have ceased to be their tax resident when you leave. You typically need to:

Formally notify tax authorities: In most countries, you must inform the tax authority of your change of residence (e.g., HMRC in the UK, the Finanzamt in Germany, ATO in Australia).

Pass the non-residency tests: Your home country will apply its own test to determine whether you are genuinely no longer resident. Key factors: have you sold/vacated your home? Have you transferred family ties? Have you cut employment and economic links?

Exit taxes: Some countries impose a tax on deemed disposal of assets when you leave — particularly on unrealised capital gains on shares and other assets.

Key exit tax countries and rules:

• Germany: Germany imposes a deemed disposal tax on unrealised gains on substantial shareholdings (≥1%) in companies when a German tax resident ceases to be resident. Under the Außensteuergesetz (AStG) §6, gains are taxed as if the shares had been sold on the date of departure. Payment can sometimes be deferred (instalment payment) if moving to an EU/EEA country.

• UK: No formal exit tax on departure in most cases. Capital gains arising after departure are generally not UK-taxable (unless you return to the UK within 5 years — the temporary non-residence rules). However, UK domicile may mean UK inheritance tax applies for years after departure.

• Australia: Australia has specific rules for departing residents — assets held at departure may be subject to capital gains tax on the unrealised gain (deemed disposal) in certain circumstances. Other Australian assets (Australian real property, interests in companies with primarily Australian real property assets) remain subject to Australian CGT even after departure.

• France: France imposes exit tax on unrealised gains on substantial shareholdings when a French resident ceases to be resident. Tax is due when the shares are actually sold (deferred for EU/EEA movers in some cases).

• USA: US citizens and long-term residents (green card holders of 8+ years) who relinquish citizenship or their green card must file an "expatriation" return and may be subject to a mark-to-market exit tax on unrealised gains above an exemption amount ($866,000 in 2024 — verify current).

The non-US situation in brief: For most non-US nationals leaving a country, the process involves: notify tax authority of departure, ensure non-residency for a full tax year (or the relevant test period), not maintain a permanent home in the country, and not be present for more than 183 days in the tax year. The details vary significantly by country.

Establishing tax residency in a new country

To genuinely establish tax residency in a new country, you typically need:

UAE: The UAE does not have a domestic test for tax residency in the traditional sense (there is no personal income tax to administer). For treaty purposes, the UAE Ministry of Finance can issue Tax Residency Certificates (TRCs) to individuals who have resided in the UAE for at least 183 days in the calendar year and have a valid UAE residence visa. The TRC is what you provide to your previous country's tax authority as evidence of UAE residence.

Georgia: Tax residents in Georgia are persons who have been in Georgia for 183 days or more in any consecutive 12 months. Georgia issues Tax Residency Certificates.

Portugal: Tax resident if you spend more than 183 days in Portugal in a 12-month period, or if you have a habitual residence in Portugal on December 31 of the year in question with the intention to maintain it as principal home.

Singapore: Tax resident if Singapore is your permanent home and you stay in Singapore for at least 183 days in the calendar year, or if you work in Singapore for at least 183 days (excluding directors' fees and certain public entertainers).

Key document: Most countries issue Tax Residency Certificates upon application by individuals who meet the residency criteria. These are used to claim treaty benefits (reduced withholding rates) and as evidence for your former country of residence that you are genuinely resident elsewhere.