Selling Your Spanish Property With a Mortgage Still Running: How the 3% Withholding Works

Selling a property you bought with a Spanish mortgage involves more moving parts than a straightforward cash purchase, especially when the loan is still active at the time of completion. Alongside cancelling the mortgage, non-resident sellers must also deal with the 3% withholding that buyers are required to apply on every purchase from someone who does not live in Spain.

For UK owners, this interacts with currency transfers, HMRC reporting under the double taxation agreement, and the practicalities of attending the notary within the usual 90 days in any 180-day stay allowance. Understanding how these pieces fit together before setting a completion date helps avoid unpleasant surprises in the final figures.

When a non-resident sells a property in Spain, the buyer is legally required to withhold 3% of the agreed price and pay it directly to the Spanish Tax Agency on the seller's behalf. This is not a penalty; it is an advance payment on account of the capital gains tax that non-residents owe on the profit from the sale. The withheld amount is paid within days of completion, using a specific form that the buyer's representative files alongside the title deed.

For UK owners who bought with a mortgage and are still repaying it when they decide to sell, this withholding happens regardless of whether there is an outstanding loan balance. The notary and the buyer's side calculate the 3% on the full sale price agreed in the deed, not on the net amount after settling the mortgage. This distinction surprises many sellers, so it is worth understanding before you set a date for completion.

At the notary, the order of payments matters. Typically, part of the buyer's funds goes first to cancel any outstanding mortgage registered against the property, because Spanish law requires the property to be transferred free of charges whenever possible. Only after that cancellation, and after the 3% withholding is set aside, does the remaining balance reach the seller's Spanish bank account.

If the mortgage balance plus the 3% withholding is close to the sale price, sellers can end up with very little net proceeds, or in some cases need to bring extra funds to the notary to complete the cancellation. Early contact with the bank that holds your mortgage, and with your gestoría or legal adviser, lets you estimate this outcome weeks before signing anything.

Once the sale completes, the seller's adviser usually files a separate tax return within a few months to reconcile the 3% already withheld against the actual capital gain calculated under Spanish rules. If the withholding turns out to be higher than the tax actually due, the difference can be reclaimed from the Spanish Tax Agency; if it is lower, the seller must pay the remainder.

Because Spain and the United Kingdom have a double taxation agreement, UK sellers also need to declare the sale to HMRC, and a local tax adviser should confirm exactly how the gain is reported on both sides so the same profit is not taxed twice without relief. Keeping records of the original purchase price, improvement costs and the mortgage cancellation is essential for this later reconciliation.

Selling while a mortgage is still running also means dealing with exchange-rate movements, since any balance that returns to a UK bank account will be converted from euros to sterling. A sale that looks straightforward in euro terms can produce a different net figure once currency conversion costs are taken into account, so it is worth asking your bank or currency provider how transfers abroad are priced before completion day.

Finally, remember that as the United Kingdom is no longer an EU member state, British owners who spend extended periods in Spain while arranging a sale should track their 90 days in any 180-day stays, or hold the appropriate visa or residence permit if they plan to remain longer during the process.

Spain is a relatively short flight away from most UK airports, making regular visits to a Spanish property straightforward for owners based in Britain. Many British buyers are drawn to Spain for its climate, coastal lifestyle and established expatriate communities. One practical point to bear in mind is that Spanish inheritance law differs from UK rules, so it is worth taking specific advice on how it may affect the property and one's estate. Currency movements between sterling and the euro can also affect the overall cost of purchase and ongoing expenses.

Spain and the United Kingdom have a double taxation agreement in place, and a local tax adviser should confirm how rental income or gains from Spanish property must be declared and reported to HMRC.

As the United Kingdom is no longer an EU member state, British citizens may stay in Spain for up to 90 days in any 180-day period without a visa, and must apply for a visa or residence permit for longer stays.

Since the United Kingdom uses the pound sterling (GBP) rather than the euro, buyers should factor in exchange-rate movements and currency conversion costs when paying for a property or transferring funds to Spain.