Double taxation agreements explained

Overview

Spain has double taxation agreements (DTAs) with a large number of countries, designed to stop the same income being fully taxed twice — once in Spain and once in your home country. Understanding how they work helps you avoid overpaying.

Requirements

• Relevant to Spanish tax residents with income or assets connected to another country, and to non-residents with Spanish-source income

Step-by-step process

• Check whether Spain has a double taxation agreement with your home country — Spain has an extensive treaty network, but terms vary by country
• Identify which country has 'primary taxing rights' over each type of income under the treaty (this varies by income type — employment, pensions, dividends, rental income, and so on are often treated differently)
• Where Spain taxes income also taxed elsewhere, claim relief through the method your treaty specifies — usually either an exemption or a tax credit for foreign tax already paid
• Declare the relief correctly on your annual Spanish tax return, since it isn't applied automatically — you generally need to claim it

Required documents

• Proof of tax paid in the other country (a certificate from the relevant foreign tax authority)
• Details of the specific income type and the relevant treaty article

Common mistakes

• Assuming a treaty automatically prevents any Spanish tax on foreign income — it usually provides relief from double taxation, not a full exemption
• Not keeping proof of foreign tax paid, which you need to claim a credit on your Spanish return

Practical tips

• Pensions are a common area of confusion — some treaties give exclusive taxing rights to one country depending on whether it's a government or private pension, so check your specific treaty's pension article
• A tax adviser familiar with the specific treaty between Spain and your home country can meaningfully reduce your admin burden and avoid overpaying

How Tuchati can help

If you're not sure how the treaty between Spain and your home country applies to your specific income, Tuchati can help you understand the general framework before you consult a tax professional.