A double taxation treaty (DTT) is a bilateral agreement between Spain and another country that decides which state has the right to tax a given item of income, and how the other state then removes the double taxation that would otherwise result. Spain has signed DTTs with more than 90 countries, 93 are currently listed in the Tax Agency's official register, most following the OECD Model Tax Convention. For Spanish tax residents, double taxation on foreign-source income is generally eliminated through the ordinary tax credit method under Article 80 of the Personal Income Tax Act (Ley 35/2006): the taxpayer deducts the lower of the tax actually paid abroad, or the amount Spain's own average effective rate would have charged on that income. A small set of treaty-specific income types use full exemption instead.
What Is a Double Taxation Treaty, and How Does Spain Use It?
If you earn income in one country while living in another, both governments can, in principle, claim the right to tax it. DTTs exist to stop that from happening twice on the same euro.
The problem DTTs solve
Spain taxes its tax residents on worldwide income. Your home country, or the country where the income arises, may tax the same income at source. Without a treaty, or without domestic relief, you could pay tax on the same salary, dividend or capital gain in both places.
A DTT solves this by allocating taxing rights between the two states for each category of income, employment, dividends, interest, royalties, pensions, capital gains, and then specifying how the country of residence removes any double taxation that remains. This is separate from, and comes before, the credit-or-exemption question below: first the treaty settles who counts as the resident, then it settles how double taxation on specific income gets removed.
What if both countries think you are a tax resident
Where a DTT exists, Article 4(2) of the OECD Model resolves a dual-residence conflict with a sequential tie-breaker, applied in order until one test settles it: first, where you have a permanent home available; if that is inconclusive, where your personal and economic ties are closer, your centre of vital interests; if still unresolved, where you habitually live; then nationality; and, as a last resort, direct agreement between the two tax authorities under the treaty's mutual agreement procedure. Remote workers who split their year across two countries commonly trigger both countries' domestic residency tests at once, Spain's 183-day rule and a similar rule elsewhere, which is exactly when this tie-breaker becomes relevant. For the full mechanics of Spain's residency test, including how the 183-day count actually works, see our guide to Spanish tax residency.
Whichever state wins the tie-breaker is treated as your sole residence for treaty purposes, even though both states may still tax you under their own domestic law. That is precisely the gap Article 80's credit mechanism, or the treaty's own elimination article, is designed to close.
The two elimination methods under the OECD Model
Most Spanish treaties follow the OECD Model Tax Convention, which sets out two mechanisms for the country of residence to eliminate double taxation once the source country has taxed the income.
| Dimension | Exemption method (OECD Art. 23A) | Ordinary credit method (OECD Art. 23B / Art. 80 LIRPF) |
|---|---|---|
| Mechanism | Spain excludes the income from its own tax base entirely | Spain taxes the income but grants a credit for the tax already paid abroad |
| Income types covered | Varies by treaty, check the specific DTT's elimination article | Spain's default mechanism for most foreign-source income under domestic law |
| Cap on relief | Full exclusion, sometimes with progression for rate-setting purposes only | Capped at the lower of tax paid abroad or Spain's average effective rate on that income |
| Who benefits most | Taxpayers whose treaty specifically lists their income type for exemption | Most Spanish tax residents with foreign investment or employment income |
Which method applies to a given item of income depends on the specific treaty text, not on a single Spain-wide rule. Always check the elimination-of-double-taxation article of the relevant DTT before assuming either method applies.
Which method Spain applies in practice
For most Spanish tax residents, the credit method is what actually shows up on the tax return, through Article 80 of the Personal Income Tax Act, regardless of whether the specific treaty labels it as a credit or leaves elimination to each state's domestic law. Exemption applies only where a specific treaty provision names that income type for exemption.
Two 2026 rulings tested how far the Art. 80 credit stretches. Treat this as active litigation, not settled law, until confirmed by the Tribunal Supremo.
Source: TEAC Res. 8643/2023 (20 Oct 2025); TSJ Madrid sentencia 30/2026 (26 Jan 2026)
Last verified: Jul 2026
In October 2025, the Tribunal Economico-Administrativo Central clarified that the "part of the taxable base taxed abroad", the figure used to cap the credit, means the Spanish taxable base attributable to that income, computed under Spanish rules, not the gross foreign base. In January 2026, the Tribunal Superior de Justicia de Madrid went further on a related point, holding that a taxpayer can deduct the full amount actually withheld abroad on dividends, without capping it at the treaty's reduced rate. Both rulings favour the taxpayer, but neither is a Tribunal Supremo cassation ruling yet, so treat them as the current direction of travel rather than final word.
To see the mechanism at work, take a simplified example. Say a Spanish tax resident pays 3,000 euros of foreign tax on freelance income abroad, and that same income would have been taxed at 3,500 euros had it been earned in Spain at their own average effective rate. Under Article 80, the credit is capped at 3,000 euros, the lower of the two figures, so the full foreign tax gets relieved. Reverse the numbers, 3,500 euros paid abroad against a 3,000-euro Spanish equivalent, and the credit caps at 3,000 euros: the taxpayer absorbs the extra 500 euros, since Spain will not credit more than its own tax would have been on that income.
Which Countries Have an Active DTT with Spain?
How to check if your country has a treaty
The Tax Agency (Agencia Tributaria, AEAT) publishes the authoritative, alphabetical list of every double taxation agreement Spain has signed, with a link through to the treaty text for each country. If your country of origin, or the country where your income arises, is not on that list, the treaty route is not available to you, though unilateral relief still is (see below). For UK nationals specifically working through this alongside a full relocation checklist, see our guide to moving to Spain from the UK.
A sample of Spain's DTT network by region
| Region | Example countries with an active DTT | Typical dividend withholding cap* |
|---|---|---|
| European Union / EEA | France, Germany, Italy, Netherlands, Ireland | 0-15%, varies by treaty |
| UK & EFTA | United Kingdom, Switzerland, Norway, Iceland | 10-15%, varies by treaty |
| Americas | United States, Mexico, Argentina, Brazil | 5-15%, varies by treaty |
| Asia-Pacific | Japan, South Korea, China, Australia | 10-15%, varies by treaty |
| Middle East | United Arab Emirates, Qatar, Saudi Arabia | 5-15%, varies by treaty |
*These ranges are indicative only. This is a sample of roughly 20 of the 93 jurisdictions on the AEAT's full list, and the exact percentage for any income type depends on the specific treaty text. Always check the DTT itself, not a generic table, before filing.
What happens if there is no treaty
No DTT with your country? Spain's Article 80 credit still applies unilaterally, but you lose the treaty's reduced source-country withholding rates.
Source: Ley 35/2006, Art. 80 LIRPF
The domestic Article 80 credit does not require a treaty to exist. It applies to any foreign-source income taxed abroad by a tax "identical or analogous" to Spanish personal income tax, treaty or no treaty. What you lose without a treaty is the reduced withholding rate the source country would otherwise apply at the point of payment, and any tie-breaker protection if both countries claim you as a tax resident. In that no-treaty scenario, if both Spain and the other country consider you a resident under their own domestic rules, there is no Article 4-style mechanism to force a single answer, so documenting your facts, days present, home, economic ties, clearly matters even more than usual.
How to Claim Double Taxation Relief in Spain
Which form you use depends on the direction the income flows, not on a single universal process. These are two different situations.
Scenario A — You are a Spanish tax resident with foreign-source income
This is the most common case for a remote worker who has relocated to Spain and kept income streams abroad, investments, freelance clients, a foreign pension.
Claiming the Article 80 credit as a Spanish tax resident
Confirm your Spanish tax residency
Check whether you meet the 183-day test or the economic-interests test under Art. 9 LIRPF for the tax year in question.
Get a certificate of tax residency if needed
If a foreign payer needs to apply a reduced treaty withholding rate at source, request it via the AEAT's Sede Electronica, immediate if requirements are met, or by paper Modelo 01, 10 to 20 working days.
Calculate the credit
Compare the tax actually paid abroad on that income with what Spain's average effective rate would have charged on it. The deduction is the lower of the two.
File Modelo 100
Declare the foreign-source income and apply the Article 80 deduction in your annual Renta return.
The treaty only protects you once you can prove, on paper, where you actually live.
Scenario B — You are not yet a Spanish tax resident but have Spanish-source income
This applies if you still hold, say, a rented-out Spanish property or Spanish investment income while your tax residency remains abroad, including during the transition months before you cross the 183-day threshold. Here, the applicable form is Modelo 210, the Non-Resident Income Tax return. You, or the Spanish payer, apply the treaty's reduced withholding rate directly on that Spanish-source income, attaching a certificate of tax residency issued by your home country's tax authority.
How ApexTax Helps You Navigate Spain's Tax Treaty Network
ApexTax works as a Cross-Border Relocation Strategist and Single Point of Contact for people relocating to Spain who need to understand how their existing income interacts with Spain's tax treaty network. We map your income sources against the relevant DTT, flag which mechanism is likely to apply, and coordinate with an independent tax advisor who confirms your exact position and prepares the filing.
ApexTax does not calculate your Article 80 deduction, file your Modelo 100 or Modelo 210, or represent you before the AEAT. Implementation of tax filings is delivered by independent qualified Spanish tax advisors selected and coordinated by ApexTax.