Tax Residency

What Is Tax Residency?

Tax residency is a legal status that determines which country has the right to tax your worldwide income. Where you live and work does not automatically determine your tax residency — countries apply their own legal tests, and you may be considered a tax resident in more than one country simultaneously.

Tax residency is distinct from:

• Citizenship: You can be a US citizen living in Germany and be tax-resident in Germany
• Immigration status: A visa or residency permit does not determine tax residency
• Domicile: A common law concept used in the UK and some Commonwealth countries, related to where you intend to make your permanent home

Why Tax Residency Matters

Tax residents typically pay tax on their worldwide income — not just income earned within the country’s borders. A UK tax resident who earns rental income from a property in Spain must declare that income to HMRC. An Australian resident who has dividends from US shares must include them in their Australian tax return.

Non-residents, by contrast, typically pay tax only on income sourced within that country — their wages from a local job, rental income from local property, etc.

Getting tax residency wrong can result in:

• Double taxation (being taxed twice on the same income by two countries)
• Penalties and interest on underpaid tax
• Criminal liability in severe cases

Country-by-Country Residency Tests

United States

The US uses two tests — meeting either one makes you a US tax resident:

1. Green Card Test: You are a lawful permanent resident
2. Substantial Presence Test: You were in the US for at least 31 days in the current year AND 183 days over a weighted 3-year period (counting: all days this year + ⅓ of days last year + ⅙ of days 2 years ago)

The US is unusual in also taxing citizens and permanent residents on worldwide income regardless of where they live — the only major country (along with Eritrea) to do so. This means a US citizen living in Australia for 10 years is still required to file a US tax return.

United Kingdom

HMRC uses the Statutory Residence Test (SRT), a structured three-part test:

• Automatic non-residence: Fewer than 16 days in the UK (or 46 days if not UK-resident in any of the previous 3 years)
• Automatic residence: 183+ days in the UK in a year, OR UK is your only home, OR you work full-time in the UK
• Sufficient Ties Test: If neither automatic test applies, additional ties (accommodation, family, work, 90-day rule, country tie) determine residency based on day count and number of ties

Australia

Australia uses a combination of a domicile test, a 183-day test, and the Commonwealth Superannuation Fund test. The domicile test considers where your home is; the 183-day test applies if you have been in Australia for more than half the year and do not have a “usual place of abode” outside Australia.

Canada

Canada uses a factual residence test based on the totality of residential ties: housing, spouse/dependants, personal property, social ties, and economic ties. There is no bright-line day count rule, though the Canada Revenue Agency treats 183+ days as a strong indicator of residency.

India

You are an Indian tax resident if you are in India for:

• 182 days or more in the financial year, OR
• 60 days or more in the year AND 365 days or more in the preceding 4 years

Indian residents are further categorised as “Resident and Ordinarily Resident” (ROR), “Resident but Not Ordinarily Resident” (RNOR), or “Non-Resident” — different rules apply to each.

Ireland

You are tax-resident in Ireland if you spend:

• 183+ days there in the current year, OR
• 280+ days combined in the current and preceding year (with at least 30 days in each)

Singapore

Tax residency in Singapore generally requires 183+ days in Singapore in a calendar year, or employment in Singapore for a continuous period straddling two years.

Dual Residency and Tie-Breaker Rules

If two countries both classify you as a tax resident, you face potential double taxation on your worldwide income. Double Tax Agreements (DTAs) contain “tie-breaker” provisions that determine which country wins the right to tax you as a resident. These typically follow a hierarchy:

1. Permanent home (where do you have a habitual home?)
2. Centre of vital interests (personal and economic ties)
3. Habitual abode (where you normally live)
4. Nationality
5. Mutual agreement between the two tax authorities

Becoming and Ceasing to Be a Resident

Arrival: Most countries treat you as a resident from the date you arrive with the intention to remain. The UK SRT applies from the start of the tax year in which you become resident.

Departure: Leaving is often more complex than arriving. The UK, for example, requires you to satisfy the SRT automatic non-residence test before HMRC will accept that you have left. Many countries have exit taxes on unrealised capital gains at the point of departure.

The US has particularly strict departure rules for citizens and long-term green card holders — the Expatriation Tax (IRC §877A) can apply a deemed disposition of all worldwide assets on the date of expatriation.

Practical Considerations

• Day counting: Keep a travel diary. Many residency tests turn on precise day counts, and the definition of a “day” varies (midnight rule, any part of the day, etc.)
• Split-year treatment: Several countries (UK, Australia) have split-year rules that divide the tax year between resident and non-resident periods for those who arrive or leave mid-year
• Professional advice: Tax residency disputes with multiple high-tax jurisdictions can be costly. Seek advice before relocating, especially if you have significant assets or business interests

Key Takeaway

Tax residency — not where you were born, not your passport — determines where you pay tax on your worldwide income. Each country has its own tests, and being a resident in two countries simultaneously can lead to double taxation (mitigated by tax treaties). Understanding your residency status is the single most important step for any international mover.