The arras is the moment your offer becomes binding. The type of arras decides what it costs you to walk away, and the deadline decides whether the mortgage process still fits. The mechanics, where it goes wrong, and one concrete timing detail from our own file.
An offer on a property in Spain is often put on paper quickly. From the moment you sign the contrato de arras, your purchase is fixed: the price, the final date and the terms. It is binding, and it is the point where most of the expensive mistakes in a Spanish purchase begin. Not because the contract is complicated, but because buyers sign before they know exactly what they are committing to.
This article explains the mechanics: what the arras is, which type you have and what that means, and why the deadline in the arras decides everything for a non-resident with a mortgage. It is not about whether you should sign. You judge that with your lawyer. It is about understanding what is at stake, and where the overview needs to be watched.
The contrato de arras is the Spanish deposit agreement: the preliminary purchase contract between buyer and seller, usually with a deposit of around 10% of the price. It fixes the core of the purchase before you reach the notary: the parties, the property, the price, the deposit, the final transfer date, and the conditions under which the purchase goes ahead or not.
Unlike a non-binding letter of intent, the arras is binding. Once both parties sign, the terms apply. That is precisely why you want to know what it says before you put your signature down, and why your lawyer reviews the draft before signing.
The most important distinction, which most explanations leave on the surface, is the type of arras. It decides what happens if one of the parties withdraws.
Arras penitenciales (set out in article 1454 of the Spanish Civil Code) give both parties the right to withdraw, at a price. If you as the buyer withdraw, you lose your deposit. If the seller withdraws, they must repay double the deposit. Here the deposit works as the agreed price of exiting. It is the most predictable form: you know exactly what withdrawing costs.
Arras confirmatorias work very differently. They confirm the sale and count as an advance payment, with no built-in right to withdraw. If a party fails to perform, the other can demand performance (forcing the purchase through the courts) or claim damages that may exceed the deposit alone. The risk is therefore larger and less predictable.
Here is a trap many buyers miss: if the contract does not expressly state that these are arras penitenciales, a Spanish court may interpret the agreement as confirmatorias. In other words, the clean exit you thought you had is not there. So have your lawyer check not only the type, but whether it is written down explicitly and unambiguously.
Separately from the type of arras, the clauses decide whether you can exit without loss under certain circumstances. The most important one for a non-resident is the financing condition (condición suspensiva de financiación): a clause stating that the purchase does not go ahead, and your deposit is returned, if you cannot obtain the mortgage.
That condition is not there automatically. It has to be included, and it has to be precisely worded: under which conditions it applies, and up to which date. A vague financing condition that expires before your bank can issue a binding offer offers little protection in practice. This is exactly the kind of thing your lawyer assesses before signing.
The date in the arras is not a detail. It is the clock the entire mortgage process has to beat.
For a non-resident with a Spanish mortgage, the desynchronisation between the bank’s timeline and the arras deadline is one of the costliest risks in the whole process. The pattern is well known: the arras deadline is set to what is customary for the seller, while the full mortgage process for a non-resident takes longer than many buyers expect. The valuation, document requests going back and forth, the binding offer, and the legally required cooling-off period of at least ten days between the binding mortgage offer and signing under the Spanish mortgage law (Ley 5/2019): all of that has to fit inside the arras term.
If the deadline is too tight, you get squeezed at the moment your options are smallest. With arras penitenciales that means, in the worst case, losing your deposit; with confirmatorias it can cost more. The way to avoid this is not speed afterwards, but room up front: an arras term that is realistic for what your bank needs, not for what is standard.
During our own purchase in Baix Empordà, something happened between signing the arras and completing at the notary that no checklist had prepared us for: the tax changed in between.
We signed our arras in late May 2025. The new, progressive ITP structure in Catalonia came into force on 27 June 2025. We completed in early September 2025. That means we signed on one tax assumption and completed under a different structure. The difference was not negligible. The lesson is not that the law always changes, but that the period between arras and completion is real time in which things can shift, and that you check the current rates rather than relying on figures from before you signed. We explain the bracket itself in our ITP article, and how those costs fit the whole picture in Closing costs when buying a house in Spain.
There was another point the arras itself had not anticipated. Our bank required the apartment and the parking space to be transferred in two separate deeds. That requirement was not in our preliminary contract and still had to be agreed with the seller. It illustrates how the arras fixes terms at a moment when the bank’s requirements are not all known yet. And the habitation certificate, the cédula de habitabilidad, which our bank wanted valid before completion, pushed our transfer back by around six weeks. Exactly why an arras deadline needs slack.
Around the arras, two roles run side by side. The lawyer does the legal due diligence: checking the title and the charges, reviewing the draft arras, the type of arras and the exit clauses, and advising whether you can sign. That is work for an independent lawyer on the buyer’s side, not the seller’s lawyer. Casa Connecta does not give that legal advice and deliberately does not work exclusively with one lawyer; you choose.
What the lawyer is not tasked with is watching whether the arras deadline aligns with the bank’s timeline, whether the financing condition is realistic given the mortgage process, and whether nothing in the following weeks, such as a changed tax rate or a bank requirement, undermines the schedule. That overview on the buyer’s side is what we watch. How that role compares to the estate agent’s and the lawyer’s is set out in Estate agent, lawyer or independent guidance. The mortgage advice itself runs through a Spanish adviser with ACI certification, under Ley 5/2019.
If you want to see the arras in the context of the whole process, our buying-process checklist, where the phase around the arras is the centre of gravity, and the buying guide will help. To understand what the lawyer does and does not catch, read A lawyer when buying property in Spain. Found a specific property and want the visible concerns and risks surfaced before you sign the arras? A Document Check (€199) is the quickest step.
Questions about your buying process? Email us at info@casaconnecta.com. We reply within one working day, in your language.
