Glossary

A common residency threshold: spending 183 days (or more) in a country during a defined period can make you tax resident there. It is not universal and often comes with caveats and additional tests.

Different jurisdictions count travel days differently (e.g., whether arrival and departure days count as days present). Always check the local rule used for the specific test.

Also known as: valor catastral

A value assigned to Spanish property in the cadastre, often used as an input for taxes (including imputed income calculations for non-resident owners).

Also known as: centre of life

A tie-break concept used in many double taxation treaties to determine which country is your main residence when both claim you. It looks at where your personal and economic relationships are strongest.

Also known as: residency exposure

Your cumulative time spent in each jurisdiction within a relevant period. Exposure matters because many residency rules and thresholds are triggered by days present.

A filing or payment cut-off date. Missing deadlines can trigger penalties and interest, even when the underlying tax due is small.

A legal concept used in some countries (notably the UK) that can affect taxation beyond residency. Domicile is not the same as nationality or residency.

Also known as: tax treaty

An agreement between countries to reduce or prevent the same income being taxed twice. Treaties often include tie-break rules for residency and rules for which country can tax particular income types.

A treaty tie-break concept referring to where you habitually live. It’s used when residency is unclear across two countries.

A notional income amount a tax authority assumes you receive, even without actual cash income. In Spain, non-resident property owners may face imputed income tax even if the property is not rented.

A legal territory with its own rules and authorities (e.g., a country). Residency tests and obligations are jurisdiction-specific.

A Spanish form commonly used by non-residents to declare tax connected to Spanish property. It often applies both to rental income and to imputed income for non-rented property.

A Spanish foreigner identification number (Número de Identificación de Extranjero) used in many administrative and tax processes for non-residents.

A person who is not tax resident in a specific country under that country’s rules. Non-residents can still have local filing or tax obligations (for example, property-related filings).

A UK regime dealing with tax on UK rental income for landlords whose usual place of abode is outside the UK. Practical obligations can involve withholding and reporting depending on the arrangement.

Charges applied for late or incorrect filing/payment. Many jurisdictions apply interest automatically and add penalties depending on severity and time overdue.

A treaty tie-break factor: whether you have a home available to you on a continuing basis in a country. It is not necessarily where you spend the most days.

Also known as: cadastral reference

The Spanish cadastral reference for a property, used to identify it in official systems. Often required for property-related filings.

Residence taxation means a country taxes residents on worldwide income. Source taxation means a country taxes income arising within its territory, even for non-residents. Many real situations involve both.

The UK’s structured approach to determining tax residency using automatic tests and ties. It’s more nuanced than a simple 183-day rule and uses multiple day thresholds.

Your tax residency determines which country can tax you as a resident (often on worldwide income). It is not the same as immigration status or nationality.

The period used by a jurisdiction for tax calculations. It varies by country (e.g., some use calendar year; the UK uses 6 April to 5 April).

Rules in treaties used to decide a single residency when two countries claim you as resident. Common tie-break factors include permanent home, centre of vital interests, habitual abode, and nationality.

Connections that can influence residency: home, family, work, economic interests, and other links. Some systems combine ties with day-count thresholds.

Income from all sources globally. Many countries tax residents on worldwide income, while non-residents are often taxed only on local-source income.