Double Taxation Relief and the Modelo 210: How the Treaty Works

The priority rule: Spanish law applies, treaties come first

Spanish non-resident taxation starts from a single sentence. Article 4 of the consolidated Non-Resident Income Tax Act (TRLIRNR, Real Decreto Legislativo 5/2004) provides that everything established in that Act applies without prejudice to the international treaties and conventions that have become part of the domestic legal order under article 96 of the Constitution. The treaty is not an optional extra sitting above the tax system; it is part of Spanish law, and where it says something different it wins.

What that rule does not do is create tax. A convention has no charging provision. If Spanish domestic law does not tax a given item of income, no treaty can make Spain tax it; if Spanish law does tax it, the treaty can strip Spain of the right to do so, or leave the right intact but cap the rate. Read in that order — first domestic law, then the treaty — most of the confusion disappears.

This is why the practical work always has two stages. Stage one: does the TRLIRNR consider this income obtained in Spanish territory, and at what rate — 24% in general, or 19% for residents of an EU or EEA State with effective exchange of tax information, and 19% for dividends, interest and capital gains whoever you are (art. 25.1.a and 25.1.f TRLIRNR). Stage two: does the convention with your country reduce that, and what proof does Spain demand before it lets you apply the reduction.

How a treaty allocates taxing rights, income by income

The conventions Spain signs follow the same architecture, so once you can read one you can read them all. Each type of income gets its own article, and each article does one of three things: it gives the right to tax exclusively to the State of residence, it gives it to both States with a ceiling on the source State, or it gives it to both States with no ceiling at all. The article numbers are stable enough to navigate by: income from immovable property is article 6, dividends article 10, interest article 11, royalties article 12, capital gains article 13, and the elimination of double taxation sits near the end, numbered 22, 23 or 24 depending on the treaty.

The verbs matter more than the numbers. When an article says income may be taxed in the other State, both States keep their power and the double taxation is cured later, in your country of residence. When it says income shall be taxable only in one State, the other must stand back completely. And when a paragraph adds that the tax so charged shall not exceed a percentage, the source State keeps the right to tax but only up to that ceiling.

For a foreign owner on the Costa Blanca the outcome is usually simple and usually disappointing: everything connected to the Spanish property lands in the first category. Spain may tax it, your country may tax it too, and the treaty tells your country to fix the overlap. The categories where the treaty genuinely lowers the Spanish bill are the financial ones — dividends, interest and royalties — which most property owners do not have in Spain at all.

Immovable property: the one place a treaty never rescues you

Article 6 of every convention Spain has signed says the same thing: income that a resident of one State derives from immovable property situated in the other State may be taxed in that other State. It covers direct use, letting and any other form of exploitation, and it extends to the usufruct of immovable property and to shares or rights that give their holder the enjoyment of a property. There is no ceiling, no reduced rate and no residence-State exclusivity. Spain taxes the house in Torrevieja because the house is in Torrevieja.

That is also why the most resented Spanish tax of all survives every treaty. Where a non-resident individual owns urban property that is neither let nor used in a business, the TRLIRNR imputes an annual income on it: article 24.5 sends you to article 87 of the 2004 consolidated Personal Income Tax Act, the rule now housed in article 85 of Ley 35/2006, which computes the imputed income as 2% of the cadastral value, or 1.1% where the cadastral values of the municipality were revised through a general collective valuation procedure that took effect in the tax period or in the previous ten. The tax accrues on 31 December each year (art. 27.1.c TRLIRNR).

Imputed income is income from immovable property in the sense of article 6, so the treaty leaves it exactly where it found it. What people describe as an unfair tax on a house they barely use is not a loophole a convention can close: it is the source State exercising a right the convention expressly confirms. The only real question is whether your home country will let you take the Spanish tax into account, which is the subject of the relief article.

Letting the property: the treaty, and the expense deduction the law reserves

Rental income from a Spanish property falls under the same article 6, so Spain taxes it in full and the treaty does nothing to reduce it. What does change the bill is a rule of Spanish domestic law, not of the convention: article 24.6 TRLIRNR allows taxpayers resident in another Member State of the European Union to deduct, when computing the base for income obtained without a permanent establishment, the expenses provided for in the Personal Income Tax Act, provided the taxpayer proves that they relate directly to the income obtained in Spain and have a direct and inseparable economic link with the activity carried on in Spain.

The same paragraph extends that treatment to residents of a State of the European Economic Area with which there is effective exchange of tax information in the terms of the first additional provision of Ley 36/2006. The EEA is the European Union plus Iceland, Liechtenstein and Norway, so a resident of those three countries reaches the same deduction through the extension rather than through the first sentence. The rate follows the same geography: 19% for residents of the EU or of a qualifying EEA State, 24% for everyone else (art. 25.1.a TRLIRNR).

Nothing in that article turns on a treaty, which is why the position of residents of the United Kingdom is worth stating carefully. The convention of 14 March 2013 between Spain and the United Kingdom remains in force and continues to apply in full — Brexit did not touch bilateral tax treaties. But article 24.6 TRLIRNR is drafted by reference to EU membership and to the EEA, not by reference to having a treaty, so a resident of a State outside both groups does not obtain the expense deduction it grants and is taxed on gross income at the general rate. If you are letting a Spanish property from outside the EU and the EEA, that is the rule to plan around, and it is the point on which a written opinion for your own situation is worth having.

Selling: gains on Spanish property and the 3% held back at the notary

Article 13 of the conventions mirrors article 6 for disposals: gains that a resident of one State derives from the alienation of immovable property situated in the other State may be taxed in that other State. Most modern Spanish conventions go further and extend the same rule to gains on shares or rights deriving more than half of their value from immovable property in the other State, and to shares that give their holder the enjoyment of a property. Selling a Spanish flat through a company rarely moves the gain out of Spain.

Domestic law then fixes the price. Capital gains realised on the transfer of assets are taxed at 19% for every non-resident, whatever their country of residence (art. 25.1.f.3 TRLIRNR) — there is no 19/24 split on gains. And the buyer of property from a non-resident must withhold and pay over 3% of the agreed consideration as a payment on account of the seller tax (art. 25.2 TRLIRNR and art. 14.1 RIRNR), paying it in within one month of the transfer.

That 3% is not the tax, it is a deposit, and it is the reason so many sales end in a refund claim. The non-resident seller declares the definitive tax on modelo 210 within three months counted from the end of the one-month period the buyer had to pay in the retention, offsetting the amount withheld against the quota; where the retention exceeds the tax, the administration refunds the excess after the checks it considers necessary (art. 14.4 RIRNR). The treaty plays no part in any of this except to confirm that Spain was entitled to charge, which is exactly what your home country will need to see.

Dividends, interest and royalties: where the treaty really caps the rate

These three are the classic treaty categories, and the drafting is always the same shape. The income may be taxed in the State where the recipient is resident; it may also be taxed in the State where it arises, according to the law of that State; but if the beneficial owner is a resident of the other State, the tax so charged shall not exceed a stated percentage of the gross amount. The source State keeps its tax and loses the excess above the ceiling.

The ceilings themselves are the part nobody should generalise. They differ from convention to convention, they often differ inside the same convention according to the size of the shareholding or the nature of the payer, several conventions set different figures for dividends paid out of income derived from immovable property, and a number of Spain treaties have been further modified by the multilateral instrument that applies the BEPS treaty measures. Any article that quotes one percentage for a whole continent is wrong about most of it. The correct figure is the one written in the convention with your country, in the version in force on the date the income accrued.

Spanish domestic law taxes dividends and interest obtained by non-residents at 19% (art. 25.1.f.1 and 25.1.f.2 TRLIRNR), so the treaty ceiling only helps where it is lower than that, and the mechanics of using it are described further down: the payer may apply it directly when withholding (art. 31.2 TRLIRNR), and where it did not, you recover the difference yourself. If you hold Spanish shares, a Spanish bank deposit or receive royalties from a Spanish payer, the treaty article is worth reading before the income is paid rather than after.

The four words that cost the most money: may be taxed

The single most expensive misreading in international tax is treating may be taxed in the other State as a transfer of the tax to that other State. It is not. It is a permission granted to the source State that leaves the residence State entirely free to tax the same income again. Both charges are lawful, both are due, and the convention accepts the overlap on purpose — it then instructs the residence State, in the relief article, to remove the resulting double burden.

Only the words shall be taxable only in a named State are exclusive. When you find that formula, the other State must not tax at all, and if it has already withheld you are entitled to the whole of it back. Everything else — and that includes every article that matters to a property owner — means both countries tax and you must file in both, claiming relief where you live rather than where the property is.

The two relief methods: exemption and credit

The relief article of a convention offers the residence State two techniques. Under the exemption method it does not tax the income the source State was entitled to tax at all; in the common variant known as exemption with progression it still takes the exempt income into account when working out the rate that applies to the rest of your income, so the Spanish rental income raises the rate on your domestic salary without being taxed itself. Under the credit method the residence State taxes your worldwide income and then deducts the tax paid in the source State from its own tax.

The credit is always capped, and the cap is the sentence that produces most of the disappointment. The deduction may not exceed the part of the residence State tax, computed before the deduction, corresponding to the income that may be taxed in the source State. In plain terms: if Spain charged more than your own country would have charged on that same income, the surplus is not refunded to you by anybody. Spain applies exactly the same limit to its own residents in article 80 of Ley 35/2006, which deducts the lower of the foreign tax actually paid and the result of applying the average effective rate to the foreign-taxed part of the base.

The direction of travel is the point to internalise: the credit is given by your country, never by Spain. The Spanish administration does not refund Spanish tax because you also paid tax at home, and it does not refund foreign tax at all. What Spain gives you is the receipt — a filed modelo 210 and proof of payment — which is the document your own tax authority will ask for before it grants either the exemption or the credit.

The document that makes it work: the residence certificate for treaty purposes

A convention only applies to a resident of a Contracting State, and Spain will not take your word for it. Article 7.1 of the Regulation of the Non-Resident Income Tax (Real Decreto 1776/2004) provides that taxpayers who are resident in a country with which Spain has a convention and who wish to rely on it determine the tax due in their return by applying the treaty limits or exemptions directly, and must attach to that return a certificate of residence issued by the corresponding tax authority, or the specific form provided for in the order implementing that particular convention.

Article 7.1 of Orden EHA/3316/2010, which governs modelo 210, is more demanding still and this is where most claims fail. Where the return applies a treaty exemption or reduces the quota by a treaty ceiling, the certificate attached must state expressly that the taxpayer is resident in the sense defined in the Convention. A plain certificate saying that you are registered as a taxpayer, or resident for domestic purposes, is not the same document and does not satisfy the article — many national tax authorities issue both, and only the treaty version is accepted. Where the convention has an implementing order with its own form, that form replaces the certificate.

These certificates expire. The same article gives certificates of residence a validity of one year from the date of issue, with an indefinite validity only where the taxpayer is a foreign State, one of its political or administrative subdivisions or its local entities. The mirror rule applies when Spanish residents need to prove themselves abroad: the AEAT issues a general certificate of tax residence in Spain and a separate one headed Certificate of residence in Spain — Convention, and only the second one works for treaty purposes in the other country.

How the treaty is actually applied on modelo 210

Modelo 210 is the single self-assessment for all income obtained in Spain without a permanent establishment, and the treaty does not have its own form. The mechanics, stated in the order that approved the model, are that the assessment is computed in every case under domestic law, and where a treaty ceiling has to be taken into account it is applied as a reduction of the quota. So you enter the income under its income-type code, apply the domestic rate, and then use the boxes provided to bring the quota down to the treaty ceiling — you do not simply write the treaty percentage in the rate box.

Which boxes you use depends on what you are declaring. Income code 02 covers imputed income from urban property and has its own section on the form; letting, gains on a sale, dividends, interest and royalties each have their own code. Where withholdings or payments on account are being offset against the quota, the documents evidencing them must be attached in every case (art. 7.2 Orden EHA/3316/2010), together with the residence certificate when a treaty is being invoked.

The filing windows are set by income type in article 5 of the same order, as amended. Imputed income from Spanish property is filed and paid between 1 April and 31 December of the calendar year following the accrual date. Returns for let property with tax to pay are filed in the first twenty calendar days of April of the year following accrual. Income from the transfer of immovable property is declared within three months once the one-month period for paying in the buyer retention has elapsed. Other income with tax to pay goes in the first twenty calendar days of April, July, October and January for the preceding calendar quarter, nil-quota returns between 1 and 20 January, and refund returns from 1 February of the following year.

Three routes when too much has been withheld

The cleanest route is to never be over-withheld. Where a treaty applies, the person paying you in Spain is entitled to withhold the amount resulting from the convention rather than from domestic law (art. 31.2 TRLIRNR), and no withholding is due at all on income exempt under article 14 TRLIRNR or under an applicable convention (art. 31.4.a). Giving the payer your treaty residence certificate before the payment is made is worth more than any refund claim afterwards.

When the withholding has already happened, the second route is the refund of the excess. Article 16.1 of the Regulation provides that where a withholding or payment on account higher than the tax quota has been borne, the excess over that quota may be reclaimed from the administration by filing the self-assessment on the approved model — a modelo 210 with a refund result. Article 16.4 deals specifically with treaty cases: where amounts have been paid into the Treasury, or withholdings borne, in excess of what results from applying a double taxation convention, the application of the convention and the consequent refund may be requested within four years counted from the date of payment or from the end of the period for declaring and paying in the withholding. The order confirms that this four-year window applies whether the refund derives from domestic law or from a convention, even where an order implementing a convention sets a shorter period.

The third route is for a return you filed yourself and got wrong. Where a taxpayer considers that a self-assessment has prejudiced their legitimate interests in any way, they may seek its rectification under article 120.3 of the General Tax Act, through the regulated procedure or, where the rules of the tax so provide, by filing a corrective self-assessment. Behind all three routes runs the same clock: article 66 of the General Tax Act extinguishes by prescription, after four years, both the right to request refunds and the administration right to assess, and article 67 fixes when that period starts to run.

When both States still tax you: the mutual agreement procedure

Sometimes the two administrations genuinely disagree — most often about which of them you were resident in, or about how a payment should be characterised — and the ordinary channels cannot fix it because each is applying its own law correctly. For that, the first additional provision of the TRLIRNR provides that conflicts arising with the administrations of other States in the application of international treaties are resolved through the mutual agreement procedures provided for in the treaties themselves, without prejudice to the right to bring whatever appeals or claims may be available.

The same provision extends to the dispute resolution mechanisms between EU Member States derived from the treaties eliminating double taxation, referred to in Council Directive (EU) 2017/1852, and states that the agreement reached applies irrespective of the time limits laid down in domestic law. That is a genuinely useful sentence: an agreement between two administrations can undo a result that had already become final at home. These procedures are slow and document-heavy, and they are the last resort rather than the first, but for a residence conflict that has produced full taxation in two countries they are the proper instrument.

The expensive mistakes an adviser actually sees

Declaring the Spanish income at home without any evidence of the Spanish tax is the most common. Both the exemption and the credit are granted by your own authority against proof, and a bank statement is not proof: what travels is the filed modelo 210 with its receipt of payment, and the treaty residence certificate that let you file it that way. Clients who file in Spain but never mention it at home, or mention it without documents, end up paying twice on income the treaty was designed to relieve.

Asking Spain to refund a foreign tax is the mirror error, and it is refused every time. The Spanish administration refunds Spanish tax that was overpaid or over-withheld; the credit for Spanish tax is a matter for your own country, and the credit for your own country tax is not a matter for Spain at all. Next to it sits the quiet killer: letting the four years run. Retentions on sales and withholdings on dividends sit unclaimed for years because nobody is sent a reminder, and article 66 of the General Tax Act does not forgive.

The last one is conceptual and it costs the most. Reading may be taxed in the other State as a promise that the other State will stand back leads people to file nowhere, or to file only at home, and then to discover the Spanish liability years later with surcharges attached. If you own or earn in Spain and live elsewhere, assume both countries tax you, file in both, and use the treaty for what it actually does: capping the Spanish rate on financial income, and obliging your own country to give you credit for the rest.