When a tax authority asks where you live, it rarely stops at counting days. It looks at your ties: where your home is, where your partner and children live, where you work, where your money sits and where your daily life happens. Tax residency ties often decide close cases, and they can make you resident in a country you thought you had left.
The details differ from country to country, but the logic is similar everywhere. Some ties, such as a home and a family, carry heavy weight. Others, such as a gym membership or a mailing address, matter mainly in combination. When two countries both claim you, a tax treaty may break the tie with a fixed sequence of tests.
This guide explains the main kinds of ties, how five well-known tax systems use them, and how the treaty tie-breaker rules weigh permanent home, center of vital interests and habitual abode.
Key takeaways
- Most countries look at a mix of physical presence and ties. A home, a spouse or partner, and dependent children are usually the heaviest ties.
- The UK counts specific ties in a formula. Canada, Australia and Spain weigh ties as part of a wider factual picture. Germany needs only a dwelling you keep and use.
- Holding a residence permit or a passport does not by itself make you tax resident in a country.
- If two countries both treat you as resident, a treaty may decide in this order: permanent home, center of vital interests, habitual abode, nationality, then agreement between the authorities.
- Leaving a country usually means cutting or reducing ties there, not only spending fewer days.
The main types of ties
The table below groups the ties that tax authorities commonly look at. No country uses this exact list, but most of the factors in domestic rules and court cases fall into these groups.
| Type of tie | Typical examples | How much weight it usually gets |
|---|---|---|
| Home | A house or apartment you own or rent and can use at any time | Heavy, especially if it stays available while you are away |
| Family | Spouse or partner, minor or dependent children | Heavy |
| Work and business | Employment, a business you run, clients, an office | Medium to heavy |
| Economic | Bank and investment accounts, property, pensions, main sources of income | Medium |
| Social | Clubs, religious groups, professional bodies, friends | Light alone, relevant together |
| Administrative | Driver's license, public health coverage, registrations, vehicle, mailing address | Light alone, relevant together |
| Presence and habit | Days spent, regular return visits, pattern of life | Varies by country |
Two points come up again and again. First, availability matters more than ownership: a rented apartment you can return to at any time may count, while a house you own but have let to an unrelated tenant may count for less. Second, intention alone is weak. The Canada Revenue Agency (CRA), for example, says that an intention to return, without residential ties, does not establish residence while abroad.
How five tax systems use ties
United Kingdom: a formula of five ties
The UK Statutory Residence Test turns ties into a count. If none of the automatic tests settles your status, the sufficient ties test compares your UK days with your number of ties. HMRC's manual defines each tie:
- Family tie: a spouse, civil partner or partner who is UK resident, or a child under 18 who is UK resident, unless you spend fewer than 61 days in person with that child in the UK during the year.
- Accommodation tie: a place to live in the UK that is available for a continuous period of at least 91 days in the tax year, where you spend at least one night. If it belongs to a close relative, the threshold is 16 nights.
- Work tie: more than three hours of work a day in the UK on at least 40 days in the tax year.
- 90-day tie: more than 90 days in the UK in either of the two previous tax years.
- Country tie: the UK is the country where you were present at midnight on the most days. This tie counts only for people who were UK resident in at least one of the previous three tax years.
The number of ties you need falls as your days rise. A person who was UK resident in any of the previous three years becomes resident with four ties at 16 to 45 days, three ties at 46 to 90 days, two ties at 91 to 120 days, and one tie above 120 days. Arrivers have a gentler scale. Our UK Statutory Residence Test guide covers the automatic tests as well.
Canada: significant and secondary residential ties
Canada has no formula. The CRA's residency folio names three significant residential ties: a dwelling, a spouse or common-law partner, and dependants. Secondary ties include personal property such as cars and furniture, social and economic ties, provincial health coverage, a provincial driver's license, a Canadian passport and professional memberships. The CRA treats a mailing address, a post office box or a safety deposit box as generally of limited importance unless combined with other ties.
The CRA also says that unless all significant ties are cut on departure, a person generally stays a factual resident. Building ties abroad helps, but the folio says it will not on its own end Canadian residence. Our guide to Canada's departure tax covers what happens when residence does end.
Australia: the resides and domicile tests
The Australian Taxation Office treats the resides test as its primary test. Under its ruling TR 2023/1, the factors include physical presence, intention, family, business or employment ties, the location and upkeep of assets, and social and living arrangements. A second test, the domicile test, treats someone with an Australian domicile as resident unless the ATO is satisfied that their permanent place of abode is outside Australia.
Germany: domicile and habitual abode
German law is short and objective. A person is fully taxable if they have a domicile or a habitual abode in Germany. Domicile means holding a dwelling in circumstances that suggest you will keep and use it. Registration with the local office is not decisive, and there is no minimum number of days. Habitual abode, under section 9 of the Fiscal Code, covers a continuous stay of more than six months, with short breaks ignored.
Spain: economic interests and family
Spain treats you as resident if you spend more than 183 days in the country in a calendar year. You are also resident if the main base of your business activities or economic interests is in Spain. A third rule presumes residence if your spouse, not legally separated, and your dependent minor children live in Spain, though you can rebut it with evidence.
When two countries both claim you
Domestic rules often overlap. You can be resident in two countries at the same time, and each one may tax your worldwide income. Most income tax treaties follow Article 4 of the OECD Model Tax Convention, which breaks the tie with a fixed sequence. Each step applies only if the one before it gives no clear answer.
- Permanent home. Where do you have a home available to you on a continuing basis? Short-term accommodation does not count, and you do not need to own it.
- Center of vital interests. If you have a permanent home in both countries, or in neither, the question is where your personal and economic relations are closer. Family, social life, work, business and assets all count.
- Habitual abode. If the center of vital interests is unclear, the treaty looks at where you habitually stay. Time spent matters here, but over a meaningful period, not one year in isolation.
- Nationality. If you have a habitual abode in both countries or in neither, you are treated as resident in the country of which you are a national.
- Mutual agreement. If none of these settles it, the two tax authorities decide between themselves.
The outcome can have wide effects. In Canada, for example, the CRA folio says that a person whom a treaty assigns to the other country is deemed a nonresident of Canada for all purposes of the Canadian tax act. Our article on tax treaty tie-breaker rules goes through each step with examples.
Ties are not the same as permits or passports
A residence permit gives you the right to live in a country. It does not by itself make you tax resident there. The OECD's guidance on tax residency for the Common Reporting Standard makes the same point: the mere right to reside somewhere, or citizenship of a country, does not automatically make a person tax resident there. Tax residence follows each country's own tax law.
The reverse is also true. You can be tax resident in a country where you hold no permit at all, if you meet its tests. Our guide on resident vs citizen differences covers how these concepts relate.
How ties change when you move
For people who relocate, ties are often the hardest part of the move. Selling or letting a home, moving family members, closing local memberships and moving the center of a business all change the picture, and they rarely happen on the same day. Many countries also apply special rules to people who leave, such as the UK's stricter thresholds for recent residents.
On the arrival side, building ties in a new country, such as a lease, a local bank account, a registered business or children in local schools, can support a claim of residence there. It does not automatically end residence in the old country. People in this position often ask an adviser in both countries to look at the full set of ties before and after the move.
Frequently asked questions
What are tax residency ties?
They are the personal, economic and practical links between a person and a country. Common examples are a home, a spouse or partner, children, a job or business, bank accounts, property, and memberships. Tax authorities use them, together with days of presence, to decide whether someone is resident.
Can I be tax resident in a country without a home there?
Yes. Many countries can make you resident through day counts alone, such as the 183-day tests in the UK, Australia and Spain. The UK can also count work, family and past presence as ties without a home.
Does keeping a bank account in my old country make me resident?
Usually not on its own. Authorities such as the CRA treat bank accounts as secondary ties that matter mainly together with other ties. A home, a partner or children who stay behind generally carry far more weight.
Which tie matters most?
In most systems and in the treaty tie-breaker, a permanent home is the first and often the strongest factor, followed by family and economic links. The exact weight depends on each country's law and on the facts of each case.
Can I be resident in two countries at once?
Yes. Domestic rules can overlap. If a tax treaty exists between the two countries, its tie-breaker usually assigns residence to one of them for treaty purposes. Without a treaty, relief depends on each country's foreign tax credit rules.
Important: This article is general information, not tax, legal or financial advice. Rules change often and depend on your personal circumstances. Speak with a qualified professional in each relevant country before you act.