If you bought a property with a mortgage in Spain, there is a new rule you need to know before taking your bank to court. To move forward with a Spanish mortgage claim, you must be able to prove that you first sent a written claim to the bank. That proof has to show three things: what you sent (the text and any attachments), when you sent it (date and time) and what reached the recipient.
For a Spanish mortgage claim,a standard email or a web form does not guarantee this. A Registered email or a burofax does. And this is no minor detail: since Organic Law 1/2025 (Ley Orgánica 1/2025) came into force, if you sue over an unfair clause in your mortgage without proving that prior claim, the court may refuse to admit your case.
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Why this matters if you bought a property in Spain from abroad
Thousands of British and other European buyers have taken out mortgages in Spain to buy a holiday home, a retirement property, or a home for a future move. Spanish consumer protection law applies to them in the same way as it does to Spanish residents: if you signed the loan as a private individual, not for business purposes, you are treated as a consumer.
That means you can benefit from the Spanish Supreme Court’s rulings on unfair mortgage clauses. It also means you are bound by the same procedural rules, including the obligation to claim from the bank first. The good news is that you do not need to travel to Spain to do it: a Spanish mortgage claim can be sent by email from anywhere.
A recent example: single-premium life insurance
On 11 June 2026, the Spanish Supreme Court (Judgment No. 913/2026 – ECLI:ES:TS:2026:2627) ruled that it is unfair for a bank to require a customer to take out single-premium life insurance, financed through the mortgage itself and arranged with an insurer from the bank’s own group, without letting the customer choose another insurer or pay periodic premiums. According to the Supreme Court, the cost of that premium should also have been included in the APR (known in Spain as the TAE).
In the case decided, the premium was almost €24,500 on a mortgage of around €151,500: more than 16% of the capital. If you took out a mortgage in Spain on similar terms, you may be able to recover the unused part of the premium and the interest you have paid to finance it.
But before thinking about court, the law requires you to take a first step: send a Spanish mortgage claim to the bank in writing, and be able to prove it.
Is a prior Spanish mortgage claim compulsory before going to court?
Claiming from the bank before going to court is nothing new. Spanish banks have had customer service departments for more than twenty years. In 2017, an out-of-court procedure was also created for floor clauses, but it was voluntary: you did not need to use it to sue.
What changes with Organic Law 1/2025 on the efficiency of the Public Justice Service is that the claim is no longer optional. Since 3 April 2025, Article 439.5 of the Spanish Civil Procedure Act (Ley de Enjuiciamiento Civil, or LEC) states that lawsuits to recover amounts paid under unfair clauses in mortgage loans will not be admitted unless they include a document proving the prior claim to the bank.
In other words: if you cannot prove your Spanish mortgage claim, your case may never get past the front door.
How the out-of-court Spanish mortgage claim procedure works (Article 439 bis LEC)
For consumer claims against financial institutions over unfair clauses, Article 439 bis LEC sets out a specific procedure:
- How it starts: you send your Spanish mortgage claim to the financial institution that granted your loan.
- The bank’s response: the bank must either accept or reject it.
- If it accepts, it must provide you with a breakdown of the amount to be refunded, including interest. If you accept, the bank must also acknowledge that the clause is null and void.
- If it rejects, it must give reasons for its decision.
- Your decision: you must accept or reject the bank’s proposal.
- Deadlines: see the table below.
- End without agreement: the procedure ends if the bank expressly rejects the claim, if a month passes without a reply, or if you disagree with the calculation, the amount offered or the bank’s position on the nullity of the clause.
| Stage | Deadline |
| Agreement between the consumer and the bank | 1 month from submission of the claim |
| Payment after accepting the offer | 1 further month from the consumer’s acceptance of the offer. If the bank does not pay, the late-payment interest rate rises by 8 percentage points, and you can go to court |
The procedure is free of charge, and while it is underway, neither party can take legal action on the same matter. There is one more key point: the positions you and the bank take during this stage may later be considered by the court when deciding who pays the legal costs. That is why being able to prove exactly what your Spanish mortgage claim said, and on what grounds, matters so much.
What evidence proves your Spanish mortgage claim?
This is where many a Spanish mortgage claim falls down. Not every communication channel leaves the same record:
| Channel | Proves content | Proves date and time | Proves delivery |
| Standard email | Partially | Partially | No |
| Ordinary letter | No | No | No |
| Burofax with text certification | Yes | Yes | Yes |
| Lleida.net Registered email | Yes, including attachments | Yes | Yes, to the recipient’s mail server |
Why send your Spanish mortgage claim by Registered email?
The prior claim is addressed to the bank’s customer service department (Servicio de Atención al Cliente, or SAC), and most banks have a dedicated email address for it. You do not need to visit a branch or send a paper burofax, which is especially useful if you are not based in Spain.
Lleida.net Registered email generates an evidence certificate that proves the sending, the exact content, the attachments, the date and time, and delivery to the recipient’s mail server. That way, you can show what you claimed, when and on what grounds, without relying on the bank to confirm it.
Lleida.net is a trust service provider under the European eIDAS Regulation (EU) No 910/2014. Under this regulation, evidence cannot be denied legal effect in court solely because it is in electronic form.
Timing matters too. In single-premium insurance cases, the Supreme Court calculates the part of the premium already used up until the judgment becomes final. The sooner you claim, the sooner the procedure starts running.
How to send your Spanish mortgage claim with Lleida.net: 4 steps
- Write your Spanish mortgage claim in your usual email client. Identify the loan (number and date of the mortgage deed, or escritura), explain which clause you are claiming and what you are asking for. Tip: Spanish banks generally handle claims in Spanish, so writing in Spanish or attaching a translation can help avoid delays.
- Address it to your bank’s SAC email and attach the documents: your ID (passport, NIE or DNI), the mortgage deed, the FEIN (European Standardised Information Sheet) or binding offer and, if you are claiming over insurance, the policy.
- Add Lleida.net’s certifying address in the copy (CC). Before sending, check that your email address is on the whitelist in your Lleida.net account. You can follow a step-by-step tutorial for sending a Registered email here.
- Keep the evidence certificate you receive. It is your proof that your Spanish mortgage claim was sent, and of its content, and the document you will attach to your lawsuit if you go to court.
What if the bank replies to or rejects your Spanish mortgage claim?
If the bank accepts your Spanish mortgage claim, you will receive its proposed calculation and can choose whether to accept it. If it rejects the claim or fails to reply within one month, the out-of-court attempt is complete and documented. From there, you can file a complaint with the Bank of Spain (Banco de España) or consider legal action. In every case, your certificate proves that you claimed it and when.
Frequently asked questions about Spanish mortgage claims
Does the bank’s web form count as proof?
It depends on what it gives you back. If it only shows a “sent” message, you will have no proof of the content or the attachments. At the very least, keep the receipt with the claim reference number, although a certified channel is the safest option.
Do Spanish courts accept certified email as proof of a prior Spanish mortgage claim?
Yes. Since LO 1/2025 came into force, several Provincial Courts (Audiencias Provinciales), including those of Ourense, Navarre, Gipuzkoa, Huelva and Álava, have accepted certified email as proof of the attempt to negotiate before filing a lawsuit. At least one has expressly considered it equivalent to a burofax.
Which address should I send the claim to?
To the official customer service (SAC) address of your bank, which usually appears on its website. This is important: one court rejected a valid certificate because it was not proven that the destination address belonged to the recipient. Take a screenshot of the bank’s web page showing the SAC address, including the date you checked it.
What do I do with the certificate if I end up suing?
Attach it to your lawsuit. The law requires you to include a document proving the prior claim to the bank, and the evidence certificate does exactly that: it shows who sent the claim, to whom, with what content and attachments, and when it was delivered.
What if the bank says the certificate is not valid?
The certificate is electronically signed and time-stamped, making it possible to verify that it has not been altered since issuance. Lleida.net also provides a verification tool that generates a technical validity report. If the bank challenges the certificate, it will have to show there is a problem.
This article is for general guidance only and isn’t legal advice. Every mortgage is different, so it’s worth speaking to a qualified lawyer before you make a claim.