Selling Your Spanish Property as a UK Owner — CGT, the 3% Retention, and Double Taxation (2026 Guide)

Selling a property in Spain as a UK owner involves a set of tax obligations that are fundamentally different from selling property in the UK. There are taxes you have never heard of (Plusvalia Municipal), mechanisms that do not exist in the UK system (the 3% retention), filing requirements with short deadlines (Modelo 210 within four months), and a Double Taxation Treaty interaction that requires you to coordinate your tax position across two countries. Add in the complication that the UK calculates your gain in GBP while Spain calculates it in EUR, and you have a situation where careful planning and professional advice are not just recommended — they are essential.

This guide walks through every step of the tax process when selling Spanish property as a UK owner in 2026, from the 3% retention at completion through to your final UK Self-Assessment. If you are still in the buying phase, our costs and taxes guide covers the purchase-side obligations.

The 3% Retention: What It Is and Why It Exists

The 3% retention is the single most misunderstood element of selling Spanish property as a non-resident. Let us be clear about what it is and what it is not.

What It Is

When a non-resident (someone who is not Spanish tax resident) sells a property in Spain, the buyer is legally required to withhold 3% of the total sale price and pay it directly to the Spanish tax authority (Agencia Tributaria) on behalf of the seller. This payment is an advance payment of the seller's Capital Gains Tax (CGT). It is not an additional tax on top of CGT — it is a prepayment of it.

The mechanism exists because Spain has no easy way to collect CGT from non-residents after they have received their sale proceeds and left the country. By requiring the buyer to withhold and remit 3% at the point of sale, the tax authority ensures it receives at least some payment upfront, which can then be reconciled against the seller's actual CGT liability.

How It Works in Practice

At completion (the signing of the escritura pública before the notary), the buyer pays the seller 97% of the agreed sale price. The remaining 3% is retained by the buyer and must be paid to the Agencia Tributaria using Modelo 211 within one month of the completion date.

For example, if you sell your property for EUR 350,000:

• You receive EUR 339,500 (97%)
• The buyer withholds EUR 10,500 (3%) and pays it to the tax authority via Modelo 211

It is important to understand that the 3% is based on the total sale price, not on the profit. If you bought the property for EUR 300,000 and sell for EUR 350,000, your actual gain is EUR 50,000 — but the 3% retention is calculated on the full EUR 350,000, resulting in a EUR 10,500 withholding. As we will see, this often means the 3% retention exceeds your actual CGT liability, entitling you to a refund.

Whose Responsibility Is It?

The obligation to withhold and pay the 3% falls on the buyer, not the seller. If the buyer fails to withhold and remit the 3%, the buyer is liable for the unpaid amount, plus interest and penalties. The notary will typically ensure that the 3% retention is correctly documented in the escritura. However, as the seller, you should ensure your lawyer verifies that the buyer has filed Modelo 211 and paid the retention, as this affects your own subsequent tax filing.

Filing Modelo 210: Calculating Your Actual Capital Gains Tax

After the sale, you (as the non-resident seller) must file Modelo 210 (Impuesto sobre la Renta de no Residentes) to declare your actual capital gain and calculate your true CGT liability. This must be filed within four months of the completion date.

The CGT Rate for Non-Residents

Non-residents from EU/EEA countries (which no longer includes UK nationals post-Brexit) pay CGT at 19%. Non-residents from outside the EU/EEA — which now includes UK nationals — pay CGT at 24%.

This is a significant difference. On a gain of EUR 50,000:

• EU/EEA resident: EUR 9,500 (19%)
• UK national: EUR 12,000 (24%)

There has been ongoing discussion about whether the UK and Spain might negotiate a bilateral agreement to restore the 19% rate for UK nationals, but as of 2026, no such agreement is in place. The 24% rate applies.

Calculating the Taxable Gain

Your taxable gain is the difference between the acquisition value (what you paid for the property, plus allowable costs) and the transfer value (what you sold it for, minus allowable costs). Here is how each is calculated:

Acquisition Value

The acquisition value is not simply the price you paid. It includes:

• Purchase price: The amount stated in the escritura de compraventa when you bought the property
• Purchase taxes: Transfer Tax (ITP) or VAT (IVA) plus Stamp Duty (AJD) paid at the time of purchase
• Notary fees at purchase: The fees charged by the notary for the purchase escritura
• Land Registry fees at purchase: The fees charged by the Registro de la Propiedad for registering the property in your name
• Legal fees at purchase: The fees charged by your lawyer (abogado) for handling the purchase. These are deductible provided you have invoices
• Documented renovation and improvement costs: This is a critical and often overlooked deduction. Any expenditure that has permanently improved the property (as opposed to routine maintenance and repairs) can be added to the acquisition value, thereby reducing your taxable gain. Examples include: new bathrooms or kitchen, extension or structural modifications, new roof, installation of a pool, rewiring or replumbing, new heating/cooling systems, and energy efficiency improvements. The key requirement is that you must have invoices (facturas) from licensed contractors, and the work must have been declared (i.e., the contractor must have charged IVA and the invoice must include their NIF/CIF). Cash-in-hand payments without invoices cannot be deducted

Transfer Value

The transfer value is the sale price as stated in the escritura, minus:

• Estate agent commission: The commission paid to the selling agent (typically 3% to 5% of the sale price plus IVA). This is deductible from the transfer value
• Legal fees at sale: Your lawyer's fees for handling the sale process
• Energy Performance Certificate (EPC): The cost of obtaining the EPC required for the sale
• Plusvalia Municipal: If the seller is contractually obligated to pay this tax (see below), it is deductible from the transfer value

Example Calculation

Let us work through a realistic example:

Purchase (2018):

• Purchase price: EUR 280,000
• Transfer Tax (ITP at 8% in 2018): EUR 22,400
• Notary fees: EUR 1,200
• Land Registry: EUR 600
• Legal fees: EUR 2,500
• Documented renovations (new kitchen, bathrooms, pool): EUR 45,000
• Total acquisition value: EUR 351,700

Sale (2026):

• Sale price: EUR 420,000
• Estate agent commission (4% + IVA): EUR 20,328
• Legal fees: EUR 2,000
• EPC certificate: EUR 200
• Net transfer value: EUR 397,472

Taxable gain: EUR 397,472 - EUR 351,700 = EUR 45,772

CGT at 24% (non-EU rate): EUR 45,772 x 24% = EUR 10,985

3% retention already paid: EUR 420,000 x 3% = EUR 12,600

Refund due: EUR 12,600 - EUR 10,985 = EUR 1,615

In this example, the 3% retention exceeds the actual CGT liability by EUR 1,615, which the seller can claim as a refund through the Modelo 210 filing. The Agencia Tributaria typically processes refunds within six to twelve months, though delays of up to eighteen months are not uncommon.

What If the 3% Is Not Enough?

If your actual CGT liability exceeds the 3% retention (which can happen if you have made a large profit relative to the sale price, or if you have few deductible costs), you must pay the difference when filing Modelo 210. For example, if the CGT is EUR 15,000 and the 3% retention was EUR 12,600, you would need to pay an additional EUR 2,400 with your Modelo 210 filing.

Plusvalia Municipal: The Other Tax on Sale

In addition to Capital Gains Tax, there is a second tax triggered by the sale of Spanish property: the Plusvalia Municipal (Impuesto sobre el Incremento de Valor de los Terrenos de Naturaleza Urbana). This is a local municipal tax based on the increase in the cadastral land value over the period you have owned the property.

How It Is Calculated

Following a landmark Constitutional Court ruling in 2021 (which struck down the previous calculation method as unconstitutional), municipalities now offer two calculation methods, and the taxpayer pays whichever produces the lower amount:

Method 1 (Objective method): Based on the cadastral land value (valor catastral del suelo) multiplied by a coefficient set by the municipality for the number of years of ownership. The coefficients are capped by law and generally range from 0.14 (for properties held for one year) to 0.45 (for properties held for 20 or more years). The resulting amount is then taxed at the municipal rate (up to 30%).

Method 2 (Real gain method): Based on the actual increase in the property's value during the period of ownership, with the gain attributed to the land portion (based on the ratio of land value to total cadastral value). This method is particularly beneficial if the property has not increased much in value, or if the land component is a small proportion of the total value.

The calculation is specific to each municipality. In popular Costa del Sol municipalities, the Plusvalia Municipal on a property owned for eight years with a cadastral land value of EUR 50,000 might range from EUR 1,500 to EUR 4,000 depending on the municipality's coefficients and tax rate.

Who Pays?

By law, the seller is liable for the Plusvalia Municipal. However, it is common practice (and legally permissible) for the buyer and seller to agree in the sale contract that the buyer will pay it. This is a matter for negotiation. If you are the seller, your lawyer should ensure the escritura clearly states who is responsible for this tax. The payment deadline is 30 business days from the date of the escritura.

No Gain, No Plusvalia

Following the 2021 Constitutional Court ruling, if you sell at a loss (the sale price is lower than the purchase price), you are not liable for Plusvalia Municipal. You will need to demonstrate the loss by presenting the purchase and sale escrituras to the relevant ayuntamiento (town hall). Your lawyer can handle this.

UK Self-Assessment: Reporting Your Spanish Property Sale to HMRC

If you are UK tax resident (or have UK tax obligations due to domicile), you must report the sale of your Spanish property to HMRC on your UK Self-Assessment tax return. This is required even though you have already paid CGT in Spain.

Reporting in GBP

HMRC requires all amounts to be reported in GBP. This means you must convert your EUR purchase price to GBP using the exchange rate on the date of purchase, and convert your EUR sale price to GBP using the exchange rate on the date of sale. This creates a phenomenon that catches many UK sellers by surprise: currency-driven taxable gains.

The Currency Gain Problem

Here is how this works in practice. Consider the following scenario:

Purchase (March 2018):

• Purchase price: EUR 280,000
• GBP/EUR exchange rate on purchase date: 1.15
• GBP equivalent: GBP 243,478

Sale (June 2026):

• Sale price: EUR 310,000
• GBP/EUR exchange rate on sale date: 1.17
• GBP equivalent: GBP 264,957

EUR gain: EUR 30,000 (a modest 10.7% gain over eight years)

GBP gain: GBP 264,957 - GBP 243,478 = GBP 21,479

Now consider a different exchange rate scenario with the same EUR prices:

Purchase (March 2018):

• Purchase price: EUR 280,000
• GBP/EUR exchange rate on purchase date: 1.40
• GBP equivalent: GBP 200,000

Sale (June 2026):

• Sale price: EUR 310,000
• GBP/EUR exchange rate on sale date: 1.17
• GBP equivalent: GBP 264,957

EUR gain: Still EUR 30,000

GBP gain: GBP 264,957 - GBP 200,000 = GBP 64,957

The EUR gain is identical in both scenarios, but the GBP gain is three times larger in the second scenario because the pound weakened against the euro between purchase and sale. You are effectively paying UK CGT on a currency movement that has nothing to do with the property's actual performance.

This is not a theoretical problem. Between 2015 and 2025, the GBP/EUR exchange rate fluctuated between approximately 1.05 and 1.45 — a range of nearly 40%. UK buyers who purchased when the pound was strong (pre-2016 referendum) and sell when the pound is weaker will face significantly larger GBP-denominated gains, and therefore higher UK CGT bills, than their EUR-denominated gains would suggest.

UK CGT Rates and Allowances

For UK tax residents selling overseas property in the 2025/26 tax year:

• Annual exempt amount: GBP 3,000 (reduced from GBP 6,000 in 2023/24 and GBP 12,300 in 2022/23)
• Basic rate taxpayer: 18% on residential property gains
• Higher/additional rate taxpayer: 24% on residential property gains

Note: UK CGT rates on residential property were increased from 18%/28% to 18%/24% in the Autumn Budget 2024 (effective from October 2024 for higher rate, the basic rate remained at 18%).

Double Taxation Treaty Relief

The UK-Spain Double Taxation Treaty prevents you from being taxed twice on the same gain. Here is how it works in practice:

Spain Taxes First

Under the treaty, Spain has the primary right to tax capital gains on immovable property (real estate) located in Spain. This means Spain taxes your gain first, at 24% for non-EU residents.

UK Gives Credit

When you report the gain on your UK Self-Assessment, you claim a foreign tax credit for the Spanish CGT already paid. The credit is limited to the amount of UK CGT that would be due on the same gain. There are two possible outcomes:

Scenario 1: Spanish CGT exceeds UK CGT

If you paid more CGT in Spain than you would owe in the UK, the foreign tax credit fully offsets the UK liability and you pay nothing additional in the UK. You cannot, however, claim a refund of the excess Spanish tax from HMRC — the credit is limited to the UK liability on that gain.

Scenario 2: UK CGT exceeds Spanish CGT (the "top-up")

If your UK CGT liability is higher than the Spanish CGT you paid, you must pay the difference to HMRC. This is known as the "top-up." This can happen because:

• The GBP-denominated gain is larger than the EUR-denominated gain (due to currency movements, as discussed above)
• The UK CGT rate on the gain is higher than the Spanish rate (for higher-rate taxpayers, the UK rate is 24% on residential property gains — the same as the Spanish non-EU rate, but the GBP gain calculation may differ)
• The deductible costs differ between the two calculations

In practice, the currency effect is the main driver of top-up payments. If the pound has weakened against the euro since you bought the property, your GBP gain will be proportionally larger than your EUR gain, and you may owe a top-up to HMRC even though you have already paid CGT in Spain.

Important: Converting the Spanish Tax Credit

When claiming the foreign tax credit on your UK Self-Assessment, you must convert the Spanish CGT paid from EUR to GBP. HMRC requires you to use the exchange rate on the date the Spanish tax was paid (not the date it was assessed or the date of the property sale). Keep the payment receipt from the Agencia Tributaria as evidence.

Final Year Non-Resident Tax Return

As a non-resident property owner in Spain, you are required to file an annual non-resident tax return (Modelo 210) each year you own the property. This is a separate obligation from the CGT filing discussed above. The annual non-resident tax is based on the deemed rental income of the property (even if you do not actually rent it out).

For the final year of ownership (the year in which you sell), you must file this annual return for the period from 1 January to the date of sale. Your lawyer or tax adviser (gestor/asesor fiscal) will typically handle this as part of the sale process. The tax is calculated at 24% (non-EU rate) on 2% of the cadastral value (or 1.1% if the cadastral value has been revised in the last ten years) for the portion of the year you owned the property.

For example, if you sell on 30 June 2026 and the cadastral value is EUR 120,000 (revised within the last ten years), the deemed income for the half-year of ownership would be: EUR 120,000 x 1.1% x 181/365 = EUR 654. At 24%, the tax would be approximately EUR 157. This is a small amount, but failing to file can result in penalties and may delay the release of your 3% retention refund.

Exemptions and Reliefs

There are two main exemptions from Spanish CGT on property sales that UK owners should be aware of:

Over-65 Primary Residence Exemption

If you are over 65 and the property you are selling is your habitual residence (vivienda habitual), the entire capital gain is exempt from Spanish CGT. To qualify:

• You must be 65 or older at the date of sale
• The property must have been your habitual residence for at least the last three years (with some exceptions for forced moves due to employment or health)
• You must be registered on the padron (municipal register) at the property address
• You must have been Spanish tax resident for the relevant period

This exemption is extremely valuable for retirees who have lived in Spain long-term and are selling their main home. However, it requires that you have been Spanish tax resident (not a non-resident owner), so it typically applies to UK nationals who have formally moved to Spain rather than those who own a second home.

Reinvestment Exemption

If you sell your habitual residence and reinvest the proceeds in another habitual residence within two years (before or after the sale), the capital gain on the reinvested portion is exempt from CGT. The exemption is proportional: if you reinvest 80% of the sale proceeds, 80% of the gain is exempt.

This exemption also requires that the property was your habitual residence and that you are Spanish tax resident. It does not apply to non-resident sellers of second homes or holiday properties — which is the situation most UK owners find themselves in.

Practical Timeline: From Decision to Sell to Final Tax Filing

Here is a realistic timeline for a UK owner selling a property on the Costa del Sol:

Three to Six Months Before Sale

• Gather all purchase documentation: original escritura, purchase invoices, renovation invoices, mortgage documents
• Obtain an up-to-date nota simple from the Land Registry
• Commission an Energy Performance Certificate (Certificado de Eficiencia Energética) — required before marketing the property
• Appoint your lawyer and estate agent
• Request a Plusvalia Municipal estimate from your lawyer
• Consult a UK tax adviser about the expected CGT position, including the currency gain analysis

At Completion (Escritura)

• The buyer retains 3% of the sale price
• You receive 97% of the sale price
• Cancel any existing mortgage (the bank will provide a certificado de deuda cero)
• Ensure the escritura correctly records the 3% retention and responsibility for Plusvalia Municipal

Within One Month of Completion

• The buyer files Modelo 211 and pays the 3% retention to the Agencia Tributaria
• Request a copy of the filed Modelo 211 from the buyer (or the buyer's lawyer) for your records

Within 30 Business Days of Completion

• Plusvalia Municipal must be paid (or contested if you believe the calculation is incorrect or you sold at a loss)

Within Four Months of Completion

• File Modelo 210 declaring your actual capital gain and claiming any refund of the 3% retention
• File the final-year non-resident income tax return (annual Modelo 210 for deemed rental income to the date of sale)

By 31 January of the Following Tax Year (UK)

• Report the property sale on your UK Self-Assessment tax return
• Claim Double Taxation Treaty relief for Spanish CGT paid
• Pay any UK CGT "top-up" due

Common Mistakes When Selling as a UK Owner

• Not keeping renovation invoices: Undocumented improvements cannot be deducted from your gain. Keep every factura from day one of ownership. Ideally, scan and store them digitally as well as keeping the originals
• Declaring a lower sale price in the escritura: This was once common practice in Spain (to reduce tax) but is now heavily scrutinised. The tax authority cross-references declared sale prices with cadastral values and market comparables. If the declared price is below the "reference value" (valor de referencia) published by the Catastro, the tax authority may assess tax on the reference value instead. The risk of penalties for undervaluation far outweighs any potential tax saving
• Forgetting to cancel the mortgage: If your property has a Spanish mortgage, it must be formally cancelled at the notary on or before completion. Failing to do so leaves the charge registered against the property, which can cause problems for the buyer and potentially delay the sale
• Not filing Modelo 210 and leaving the 3% on the table: Some sellers, particularly those who return to the UK and do not want to deal with Spanish bureaucracy, simply fail to file Modelo 210. This means the 3% retention is kept by the Spanish tax authority by default. If the 3% exceeds your actual CGT liability (as it often does), you are effectively overpaying your tax. Your lawyer can file Modelo 210 on your behalf with a power of attorney, so there is no need to return to Spain
• Ignoring the currency gain for UK CGT: As discussed in detail above, the GBP-denominated gain can differ dramatically from the EUR-denominated gain. Failing to account for this on your UK Self-Assessment can result in an understatement of your UK tax liability, which may lead to penalties and interest if HMRC later discovers the error
• Not planning the sale date: If you are close to qualifying for the over-65 exemption or the reinvestment exemption, delaying the sale by a few months could save you tens of thousands in CGT. Similarly, if the GBP/EUR exchange rate is at a historically extreme level, the timing of the sale can significantly affect your UK CGT position. While you cannot time currency markets with precision, you can at least be aware of the effect and factor it into your decision

Closing Your Spanish Bank Account and Utilities

After the sale is complete and all taxes have been paid (or are being handled by your lawyer), you may want to close your Spanish bank account and terminate utility contracts. However, we recommend keeping your Spanish bank account open until:

• The Modelo 210 refund (if applicable) has been received — the refund is paid into your Spanish bank account
• All outstanding tax obligations have been resolved
• Any final utility bills have been paid

This typically means keeping the account open for 12 to 18 months after the sale. Once everything is settled, you can close the account by visiting the branch in person or, in some cases, by providing a notarised letter of instruction.

Summary and Key Takeaways

Selling Spanish property as a UK owner involves multiple tax obligations across two countries. The key points to remember are:

1. The 3% retention is an advance payment of your CGT, not an additional tax. It is withheld by the buyer and paid to the Agencia Tributaria via Modelo 211 within one month of completion
2. You must file Modelo 210 within four months of completion to declare your actual gain and either claim a refund of the overpaid 3% or pay the difference if your CGT exceeds the retention
3. The non-EU CGT rate is 24%, calculated on the difference between your acquisition value (including all allowable costs and documented improvements) and your net transfer value (sale price minus selling costs)
4. Plusvalia Municipal is a separate local tax based on the increase in cadastral land value. It is due within 30 business days and is negotiable between buyer and seller
5. HMRC requires you to report the sale in GBP, using exchange rates on the dates of purchase and sale. Currency movements can create a significant GBP gain even when the EUR gain is modest
6. The Double Taxation Treaty provides a foreign tax credit for Spanish CGT paid, but you may owe a UK "top-up" if the GBP-denominated gain or UK rate produces a higher liability
7. Keep all invoices for renovations and improvements from the moment you buy — they reduce your taxable gain when you sell
8. File your final-year non-resident tax return for the portion of the year you owned the property

For more detailed information about costs associated with buying and owning property in Spain, visit our costs and taxes guide. To estimate your potential CGT liability, try our property cost calculator. And for general information about the Spanish property market for UK buyers, see our UK buyers' page.