Fianza vs. Aval in Spain: Differences and Legal Guarantees

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When renting a property, applying for a bank loan, or signing a commercial contract in Spain, it is extremely common to be asked for "guarantees" to ensure that we will meet our payment obligations. In this scenario, the terms "fianza" (security deposit or guarantee) and "aval" (guarantor or bank guarantee) are often used interchangeably in everyday language, which generates enormous legal confusion among citizens and foreign residents. However, although both mechanisms share the purpose of protecting the creditor against a potential default, the Spanish Civil Code and banking practice grant them drastically different natures, operations, and costs. Understanding these differences is not just an academic matter, but a financial necessity to avoid assuming disproportionate asset risks or signing abusive clauses.

The Legal Framework of Guarantees in Spain: What Does the Civil Code Say?

To fully understand these concepts, we must turn to the *Spanish Código Civil (CC / Civil Code), which regulates the foundations of obligations and contracts. Spanish law conceptualises the fianza and the aval* from different legal perspectives, even though both belong to the category of personal guarantees.

The Fianza According to the Civil Code

The fianza is regulated in detail in *Article 1822 and following of the Código Civil**. The code defines the fianza as a contract by which a person (the guarantor or fiador*) binds themselves to pay or perform for a third party, in the event that the latter fails to do so.

The fundamental characteristic of the fianza is its accessoriness. This means that the fianza does not exist independently; it depends on a main contract (for example, a rental agreement or a loan). If the main contract is terminated, rendered null and void, or modified, the fianza suffers the same fate.

Furthermore, unless expressly agreed otherwise, the guarantor enjoys two fundamental protective rights:

• *The beneficio de excusión (benefit of discussion - Article 1830 of the CC):* The guarantor cannot be forced to pay the creditor until all the assets of the principal debtor have been exhausted and foreclosed. In other words, the creditor must first go after the defaulting debtor and, only if they are insolvent, can they claim from the guarantor.
• *The beneficio de división (benefit of division - Article 1837 of the CC):* If there are several guarantors for the same debtor and for the same debt, the obligation to answer for it is divided among them all, and the creditor cannot claim from each one more than the share corresponding to them.

The Aval: The Abstract and Joint Guarantee

Although the term "aval" is constantly used in commercial and banking transactions, the Código Civil does not contain a specific and systematic regulation of this term with the rigour that defines the fianza. The aval is a concept created by legal doctrine and case law, historically closely linked to Commercial Law (such as in the Ley Cambiaria y del Cheque / Bill of Exchange and Cheque Act) and to banking practice.

Unlike a common fianza, an aval is usually configured as a joint and abstract guarantee:

• *Joint liability (solidaridad): By agreeing to joint liability (waiving the benefits of excusión and división), the guarantor (avalista) places themselves in exactly the same position as the principal debtor. The creditor can go directly against the avalista* from the very first day of delay, without needing to try to collect from the debtor first.
• *Autonomy (in the aval a primer requerimiento / demand guarantee):* This is a very common modality where the guarantor (usually a bank) binds itself to pay the creditor upon simple notification of the default, without any possibility of disputing whether or not the principal debtor was right in not paying.

Key Differences: Fianza vs. Aval

To quickly visualise the impact of choosing one option or the other, we analyse their differences in critical aspects:

| Feature | Fianza (Conventional) | Aval (Banking / Commercial) | | :--- | :--- | :--- | | Main regulation | *Articles 1822 to 1856 of the Código Civil. | Commercial practice, case law, and banking regulations. | | Order of claim | The claim is first made to the debtor; the guarantor responds subsidiarily (unless a joint liability agreement is made). | The claim can be made directly to the guarantor (usually joint and several). | | Link to the contract | Accessory (if the contract is cancelled, the fianza is also cancelled). | It can be autonomous and independent of the main contract. | | Financial cost | Generally free of charge (usually a family member or business partner). | High (bank arrangement fees, quarterly commissions, and study fees). | | Retention of funds | Does not require blocking money (except for the legal rental fianza). | Usually requires pledging (pignorar*) / blocking funds in a bank account. |

Types of Avales and Fianzas in Spanish Practice

In the day-to-day Spanish economy, we encounter various versions of these guarantees. It is vital not to confuse them, especially in the real estate sector.

1. The Legal Rental Deposit (fianza legal arrendaticia)

We must not confuse the fianza of the Código Civil (the guarantor who guarantees a payment) with the cash security deposit regulated in *Article 36 of the Ley de Arrendamientos Urbanos (LAU / Urban Leasing Act)*.

• This fianza is a mandatory cash deposit that the tenant must hand over to the landlord upon signing the contract.
• Its amount is 1 month's rent for residential properties and 2 months' rent for use other than residential (commercial premises, offices).
• Its purpose is to guarantee that the property will be returned in good condition, not to secure the payment of rent (although it is sometimes used to offset debts). This money must be deposited by the landlord in the competent regional body (such as IVIMA in Madrid or INCASÒL in Catalonia).

2. The Bank Guarantee (aval bancario)

This is a contract by which a financial institution (the avalista) guarantees the fulfilment of its client's obligations towards a third party. In rentals, it is common for the landlord to request an aval bancario equivalent to between 3 and 6 months' rent as an additional guarantee to the legal fianza.

3. The Personal Guarantee (aval personal)

This is provided by a natural person (for example, parents who act as guarantors for their child on their first mortgage or rental contract). The guarantor responds with all their present and future assets, in accordance with *Article 1911 of the Código Civil*** (principle of universal liability).

Practical Examples with Real Figures

To understand the economic impact of these concepts, we analyse two common scenarios in the Spanish market.

Example 1: María's Apartment Rental (Legal fianza and bank aval)

María wants to rent a flat in Valencia for a rent of €1,000 per month. The landlord requires:

1. The legal fianza under the LAU: €1,000 (equivalent to 1 month). María hands this money over in cash, and the landlord deposits it with the Generalitat Valenciana.
2. A bank aval of 3 months' rent (€3,000) as an additional guarantee to cover potential defaults.

*What procedures and costs does María face with the bank aval?*

• Her bank asks her to pledge (pignorar) / block €3,000 in an account from which María will not be able to touch a single cent for the duration of the contract.
• The bank charges her an arrangement fee of 1% (€30) and a quarterly maintenance commission of 0.75% on the guaranteed amount (€22.50 every three months, which is €90 per year).
• If María stops paying the rent for a month, the landlord goes to the bank with the aval document, and the bank hands over the €1,000 immediately. Afterwards, the bank will demand that money from María, applying high default interest rates.

Example 2: Juan's Loan (Joint Personal Fianza)

Juan applies for a loan of €20,000 to open a business. The bank asks his father, Pedro, to sign as a joint guarantor (fiador solidario).

• By signing as a "fiador solidario", Pedro expressly waives the beneficio de excusión of *Article 1830 of the Código Civil***.
• If Juan fails to pay a monthly instalment of €400, the bank is under no obligation to legally pursue Juan's assets first; it can directly sue Pedro and garnish his pension or his accounts to collect the €400.

Step-by-Step Practical Procedures to Set Up These Guarantees

If you find yourself in the position of having to provide or request one of these guarantees, this is the procedural path you must follow in Spain:

Step 1: Negotiation and Drafting of the Clause

Before signing anything, the parties must agree on what type of guarantee will be provided. If it is a personal aval or fianza, it must be drafted precisely in the main contract (rental or loan). If you are the guarantor, demand that the waiver of the benefits of excusión and división not be included, otherwise you will be assuming an extremely dangerous joint liability.

Step 2: Requesting the Aval from the Bank (if applicable)

If a bank aval is chosen:

• You must present the bank with the draft rental contract or the document specifying the exact text of the aval required by the creditor.
• The bank will carry out a credit assessment (analysing your payslip, CIRBE / Bank of Spain Risk Information Registry, etc.).
• If approved, the parties will proceed to sign a Póliza de Cobertura de Garantía o Aval (Guarantee Coverage Policy) before a Notary, which will make the process more expensive due to notary fees (usually ranging between €150 and €300).

Step 3: Depositing the Legal Fianza (in rentals)

In the case of the rental fianza under the LAU, the landlord has a legal obligation to deposit the money in the registry of their Autonomous Community within a period that usually varies between 15 and 30 days from the signing of the contract. Failure to do so carries fines of up to 150% of the value of the fianza.

Step 4: Cancellation and Return

• *LAU Fianza: At the end of the contract, if the property is in good condition and there are no outstanding debts, the landlord has a period of 30 days to return the fianza* starting from the handover of the keys. If they take longer, it will accrue the legal interest rate on money.
• *Bank Aval: To cancel the aval and recover the blocked money in the bank, the client must hand over to the financial institution the original aval* document signed by the creditor where the latter consents to its release, or a contract termination document signed by both parties.

Mistakes You Must Avoid

Assuming or demanding a guarantee without proper advice can lead to serious financial consequences. Avoid making the following common mistakes:

• *Signing as a joint guarantor (fiador solidario) "as a favour" or due to family commitment: Signing a joint fianza* is equivalent to being the principal debtor. If the other person does not pay, your salary, your car, and your home will be at risk of direct seizure by the creditor, without you being able to demand that they first claim from the actual debtor.
• *Not demanding the receipt of the rental fianza deposit: If you are a tenant, always demand from the landlord the proof of having deposited the fianza in the regional body. Without this deposit, in many Autonomous Communities, you will not be able to apply for rental tax deductions in your income tax return (IRPF*).
• *Forgetting to recover the physical bank aval document: The bank will continue to charge you quarterly commissions indefinitely for the aval* as long as you do not hand over the original physical document or an express release letter signed by the beneficiary (the creditor). It is not enough for the rental contract to have ended.
• *Confusing a demand guarantee (aval a primer requerimiento) with an ordinary fianza:* If you are the debtor and you allow a demand guarantee, you should know that the beneficiary will be able to execute it and collect from the bank almost automatically, even if there is a dispute over whether you actually owed that money or not. You will have to litigate afterwards to recover it.

Frequently Asked Questions (FAQ)

Can a landlord ask me for a 5-month rental fianza in Spain?

According to Article 36 of the LAU, the mandatory legal fianza is 1 month for residential properties. However, the parties can agree on "additional guarantees" (such as deposits or avales). But beware: in residential rental contracts of up to 5 years in duration (or 7 if the landlord is a legal entity), the value of these additional guarantees cannot exceed 2 months' rent. Therefore, the total maximum they can withhold from you between the legal fianza and the additional guarantee is 3 months' rent.

What happens to the aval or fianza if the rented flat is sold?

If the property is sold to a third party, the new owner subrogates to the rights and obligations of the previous rental contract. This means that the old landlord must transfer the legal fianza deposited in the official body to the new owner, and the additional guarantees (such as personal or bank avales) remain in force and guarantee compliance with the contract towards the new landlord.

Can the rental fianza be used to pay the last month's rent?

Absolutely not. It is a very widespread mistake among tenants to think that they can avoid paying the last month by telling the landlord to "take it from the fianza". The purpose of the fianza is to ensure that the property is delivered without damage and with utility bills settled. The tenant must pay the last monthly instalment in full, and the landlord will have 30 days after the handover of the keys to check the condition of the property and return the corresponding balance.

What assets can be seized from a guarantor (avalista) if the principal debtor does not pay?

In Spain, under the principle of universal liability (*Article 1911 of the Código Civil**), the guarantor responds with all their present and future assets. This includes balances in bank accounts, salaries, or pensions (respecting the limits of the Minimum Interprofessional Wage according to the Ley de Enjuiciamiento Civil* / Civil Procedure Act), tax refunds from the tax agency, vehicles, shares, and real estate (including their own habitual residence).

In Summary

• The ordinary fianza is an accessory and subsidiary guarantee regulated in the Civil Code, where the guarantor has the benefits of excusión and división (unless agreed otherwise).
• The aval is a more rigid guarantee, usually joint and several, which allows the creditor to claim the debt directly from the guarantor without needing to exhaust the avenues against the principal debtor.
• The rental fianza under the LAU is a mandatory cash deposit of 1 or 2 months that must be held in a regional public body.
• Bank avales entail significant financial costs (arrangement fees, quarterly commissions, and notary expenses) and usually require the freezing of funds.
• Before signing as an avalista or fiador, it is crucial to review the rights waiver clauses so as not to irreversibly compromise personal assets.

General legal information, not personalised legal advice. For your specific situation, ask your question for free at AbogadoAI — answers grounded in Spanish law (BOE), in English.

This is general information, not legal advice. Verify on the BOE or consult a lawyer for your specific case.