Your allies in a property purchase: condición suspensiva and condición resolutoria explained

Let me explain two concepts that sound like something a serious lawyer in a tie would say, but which are actually your best allies when buying or selling a property: the condición suspensiva (condition precedent) and the condición resolutoria (condition subsequent). Used correctly, they can save you from losing your deposit or being trapped in a deal that cannot be completed. Misunderstood, they leave you exposed.

The good news is that they stem from a very simple principle in Spanish law: within the limits of the law, the parties can agree on whatever they wish — this is known as autonomía de la voluntad (freedom of contract), Article 1255 of the Código Civil. Let us use that freedom to your advantage.

Condición suspensiva: the contract 'on pause'

A condición suspensiva (condition precedent) is an 'if' that suspends the effects of the contract. The agreement exists — it has been signed — but it produces no legal effects until the agreed future and uncertain event occurs. Until then, it remains on hold.

A typical example: 'I will buy this property IF the bank grants me a mortgage before such a date' or 'IF the local council grants planning permission'. If the condition is met, the contract takes full effect and completion proceeds. If it is not met, the contract never takes effect and you recover your money. It is the perfect safety net when something depends on a third party — a bank, a public authority — that you cannot control.

Condición resolutoria: the contract that can be undone

The condición resolutoria (condition subsequent) is the opposite. Here the contract DOES take effect from the outset, but the parties agree that it may be undone if a certain event occurs (or does not occur). In other words: it works, but with a pre-agreed 'undo button'.

The most common example is a sale with deferred payment: the seller hands over the property, but if the buyer fails to pay the remainder by the agreed deadline, the sale is resolved and the property reverts to its original owner. The Código Civil regulates this in detail for real estate (Arts. 1124, 1503 and 1504), with one important nuance: even if automatic termination has been agreed, the buyer may still pay so long as no formal demand has been made; and if the buyer contests, a court may sometimes need to confirm the termination.

And what about arras? Do not confuse them with a condition

The arras (deposit, Article 1454 of the Código Civil) are the sum paid when reserving a property. In their most common form — arras penitenciales (cancellation deposit) — either party may withdraw: if the buyer pulls out, they forfeit the deposit; if the seller pulls out, they must return double the amount. It is a right to walk away, not a guarantee that the transaction will proceed.

That is why they are not the same thing. Arras allow you to exit by paying a price; a condición suspensiva means you do not even have to pay that price if what fails is an external process (the mortgage, the planning permission). Confusing the two is one of the most costly mistakes I see.

What you can request from the Registro de la Propiedad

Here is the detail that many buyers do not know: these protections do not have to remain only in the contract. Some can be registered at the Registro de la Propiedad (Land Registry), which protects you against third parties.

• Condición resolutoria explícita (explicit condition subsequent): where there is deferred payment, this can be recorded at the Registro de la Propiedad (Art. 11 of the Ley Hipotecaria). If the buyer does not pay, the seller has a far more robust means of recovering the property.
• Mortgage to secure deferred payment: another way of protecting the outstanding balance.
• Preventive annotations and agreed penalty clauses, within the limits of the law.

When these appear on the register, anyone who searches the property can see its true legal position. This is publicidad jurídica (legal notice): what is registered protects; what remains in a drawer, far less so.

When should you use each one?

If you are about to sign an arras agreement or a purchase contract, let me review it first. A clause well included — or well removed — can save you far more than the cost of the consultation. It is the kind of detail that separates a smooth transaction from an expensive problem.