If you work in Spain without being a tax resident here, you're not taxed under the income tax system most workers know, but under a different tax with its own rules: the Non-Resident Income Tax (IRNR).
How tax residency in Spain is determined
Tax residency doesn't depend on your nationality or your work permit, but mainly on two alternative criteria: spending more than 183 days in Spain during the calendar year, or having the main center of your economic activities or interests in Spain. Meeting either of these criteria makes you a tax resident in Spain, regardless of your administrative status or nationality.
The key difference: worldwide income or only Spanish-source income
- Tax resident: pays income tax on their worldwide income, meaning all their income regardless of the country where it's earned, applying the general progressive scale.
- Non-tax-resident: pays IRNR only on income earned in Spain, generally at a flat rate (not progressive), without access to the personal and family allowances or most of the deductions available under ordinary income tax.
The rate that applies to non-residents
Generally, employment income earned in Spain by non-residents is taxed at a flat rate, different from (and generally without the reductions or allowances of) ordinary income tax that would apply to a resident with the same income level. Specific, reduced rates exist for residents of other European Union or European Economic Area countries in certain cases.
Double taxation treaties
Spain has signed double taxation treaties with numerous countries, which determine which country has the right to tax each type of income and, where applicable, how to prevent the same income from being taxed twice (in Spain and in the worker's country of residence). These treaties can modify the general IRNR rules depending on the taxpayer's specific country of residence.
What happens if your situation changes mid-year
If you change your tax residency during the year (for example, you move to Spain mid-year and exceed 183 days), your taxation for that year may require separate treatment for the period when you were a non-resident and the period when you became a resident, with corresponding separate returns for each period.
This is an area that requires specialized advice
Given the complexity of correctly determining tax residency and applying the relevant double taxation treaties, it's highly advisable to get specialized international tax advice if your situation isn't that of a standard Spanish tax resident.
Simulate your situation as if you were a Spanish tax resident
Our income tax calculator is designed for Spanish tax residents filing under ordinary income tax; it can serve as a comparative reference, though your actual taxation as a non-resident follows different rules.