The bank is claiming from you as guarantor: how to fight back

The case, in five lines

What is brought

Opposition to the enforcement ordered against the guarantor, on procedural defects (article 559 LEC, the Civil Procedure Act), including the absence of the prior notice of the balance required by article 572.2 LEC, and on the substantive grounds of article 557 LEC: limitation, overclaiming and unfair terms. What that closed list does not admit, such as extinction of the guarantee by an extension or variation made without your consent (articles 1851 and 1207 of the Civil Code), is brought as a declaratory action.

Before which court

The civil section of the Tribunal de Instancia (the first instance court) that ordered the enforcement: that of the debtor's domicile, of the place of performance or of any place where there are attachable assets, at the bank's choice and with no effect for any agreed choice of forum (article 545.3 LEC). Appeals go to the Audiencia Provincial (the provincial appeal court). The bank needs no prior negotiation attempt to file for enforcement (article 5.3 of Organic Law 1/2025); for a declaratory claim, it does.

Deadline

Ten working days from service of the order opening enforcement to oppose it (articles 556.1 and 557.1 LEC): a preclusive procedural period that does not reopen. If what arrives is an order for payment, twenty days (article 815.1 LEC). The bank's action against you is time barred five years after the debt became enforceable (article 1964.2 of the Civil Code), and the nullity of an unfair term is not subject to any time limit.

Who can bring it

You, as the guarantor against whom enforcement or a claim is brought, against the bank or against the fund to which it has assigned the debt. If you pay, you acquire a right of reimbursement against the principal debtor and are subrogated to the bank's rights (articles 1838 and 1839 of the Civil Code), and you can claim their proportionate share from the other guarantors (article 1844 of the Civil Code).

Financial risk

If the opposition is dismissed in full, you are ordered to pay the costs of that incident (article 561.1 LEC) and the enforcement continues: a guarantor answers with all his present and future assets (article 1911 of the Civil Code), limited only by what cannot be attached, such as the part of a salary or pension not exceeding the national minimum wage (article 607 LEC). If it succeeds, the attachments are lifted and the costs fall on the bank (article 561.3 LEC).

First of all: what you have received and which clock it starts

A guarantor seldom receives a single communication. First there is usually a letter or a burofax (a certified letter with proof of content) from the bank or its collection agency, with a figure and a deadline of a few days to pay that no statute sets. That document opens no proceedings and does not oblige you to reply by any date, but it does have effects: an out of court claim by the creditor interrupts limitation (article 1973 of the Civil Code), and whatever you reply in writing may later be used as an acknowledgment of the debt.

What does carry an unforgiving deadline is service by the court. If the bank holds a policy witnessed by a notary or a notarial deed, it will normally go straight to enforcement, and you then receive an order opening it: you have ten working days from service to oppose, under articles 556.1 and 557.1 of the Civil Procedure Act (LEC). If it has no enforceable instrument, it may use the order for payment procedure, with twenty days to oppose, or bring a declaratory claim. The mechanics of the order for payment and of mortgage enforcement are explained in their own guides; here we focus on what is specific to the guarantor.

The prior negotiation requirement introduced by Organic Law 1/2025 works asymmetrically here. Its article 5.3 exempts the filing of an enforcement claim from any prior attempt at an appropriate dispute resolution method, so the bank can enforce against you without ever having offered to negotiate, and the opposition, being an incident within that enforcement, does not need it either. By contrast, if the bank chooses a declaratory claim, or if it is you who sues for a declaration that the guarantee is extinguished or void or to recover what you paid, article 5.1 makes that prior attempt a condition for the claim to be admitted, and what is negotiated must match what is later asked of the court.

Joint and several guarantee: why the bank can come to you first

Article 1822 of the Civil Code defines a guarantee as the obligation to pay or perform for a third party if that party fails to do so, and article 1830 adds that the guarantor cannot be compelled to pay the creditor until all the debtor's assets have first been pursued, the so called benefit of excussion. That is what almost everyone believes they signed: a second line guarantee that only comes into play once the debtor has nothing left.

But that same article 1822 provides that, where the guarantor undertakes joint and several liability, the rules on joint and several obligations apply, and article 1831 states that excussion does not apply where the guarantor has expressly waived it, has bound himself jointly and severally with the debtor, or where the debtor is in insolvency proceedings. Bank policies almost always contain the first two at once: a joint and several guarantee and an express waiver of the benefits of excussion, order and division. With that clause the bank may come to you without touching a single asset of the debtor, and an opposition that merely invokes excussion leads nowhere.

There are two ways out worth knowing. The first lies outside the Civil Code: article 3 bis of Royal Decree Law 6/2012, on urgent measures to protect mortgage debtors without resources, allows guarantors and third party mortgagors who fall within its exclusion threshold to require the lender to exhaust the principal debtor's assets before claiming from them, even where they expressly waived excussion; it operates on the loans secured by a mortgage over real property that fall within that statute, and the threshold has to be proved. The second is consumer status, which allows the joint and several clause and the waiver themselves to be challenged. And where excussion is available, article 1832 requires it to be raised as soon as the bank demands payment and requires the guarantor to point to assets of the debtor that can be realised in Spain and are sufficient to cover the debt: saying that the debtor has means is not enough.

If you had nothing to do with the business, you are a consumer even if it was a business loan

Article 3 of the TRLGDCU (the Spanish consumer protection act) treats as consumers natural persons acting for purposes outside their trade, business, craft or profession. The Court of Justice of the European Union and, following it, the Tribunal Supremo (the Spanish Supreme Court) have held that this status is assessed in the guarantee contract itself and in the person of the guarantor: the father, mother, spouse or friend who guarantees a company's loan without any functional link to that company is a consumer, even though the loan guaranteed is a business loan.

The functional link is the dividing line, and it is proved with documents. It exists for whoever was a director or manager of the debtor company, or held a significant stake in its capital, and the courts have denied consumer status to shareholders with substantial holdings where the loan financed the business. Kinship with the director does not, on its own, create it. That is why the first piece of evidence in the case is the company's registry history at the date of signing, and the second is your own employment and tax record.

Being a consumer changes the case. It opens the transparency and unfairness review of the guarantee clause and, as the Tribunal Supremo has accepted, of the loan terms that determine what is claimed from you, and it places on the bank the burden of proving that the term was individually negotiated (article 82.2 TRLGDCU). Moreover, article 88.1 TRLGDCU treats as unfair in every case the imposition of guarantees disproportionate to the risk assumed; it presumes there is no disproportion where the lender complies with its sector rules, but that presumption can yield: in December 2025 the Civil Chamber of the Tribunal Supremo declared void as unfair the joint and several guarantee given by two parents with no link to the company, who had also mortgaged their own property to secure the loan to their son's business.

What the bank agreed later without you may have released you

Article 1851 of the Civil Code is short and devastating: an extension granted to the debtor by the creditor without the guarantor's consent extinguishes the guarantee. The reason is that an extension worsens the guarantor's position, pushing back the payment date while the debtor's assets may be deteriorating. A grace period, a longer repayment term or a refinancing signed by the debtor alone are the typical cases; mere tolerance by the bank, which does not chase an overdue instalment, is not an extension.

Other rules operate alongside it. If the refinancing extinguished the original obligation and replaced it with a new one, article 1207 provides that ancillary obligations, and a guarantee is one, survive only insofar as they benefit third parties who did not consent. If it merely altered the obligation to make it heavier, article 1827 prevents the guarantee from extending beyond what it contains, and article 1826 prevents the guarantor from being bound to more than the debtor, in amount or in the burden of the terms. Article 1852 releases guarantors, even joint and several ones, where an act of the creditor prevents them from being subrogated to its rights, mortgages and privileges, as happens if the bank cancelled a mortgage or released another security without being paid; and if it released another guarantor, article 1850 makes that release benefit you up to that guarantor's share.

Here lies the trap that almost nobody explains. Policies usually include a clause by which the guarantor consents in advance to any extension or variation, and courts tend to uphold it, so the first task is to read it and, if you are a consumer, to challenge its transparency and scope. Moreover, extinction of the guarantee does not appear as such in the closed list of grounds of opposition in article 557 LEC: it can partly be framed as a documented extension of time or as overclaiming, but whatever does not fit there goes to declaratory proceedings, which article 564 LEC allows for facts arising after the instrument, which require the prior negotiation attempt and which do not, on their own, halt the enforcement. That is why both routes are prepared at the same time.

Enforcement against a guarantor has cracks of its own

When the bank enforces for the balance of a policy or a deed, article 572.2 LEC imposes a specific requirement: enforcement is ordered only if the bank proves that it previously notified the debtor, and the guarantor if there is one, of the sum due resulting from its calculation. It is common for the bank to notify the debtor company and forget the guarantor, or to send the burofax to an address that is no longer yours. Without that notice the instrument does not meet the requirements to be enforceable, and the opposition rests on the nullity of the enforcement order under article 559.1.3 LEC, a procedural defect decided before the merits.

The second front is the amount. A guarantor cannot be bound to more than the debtor (article 1826 of the Civil Code), the guarantee does not extend beyond what was agreed, often with a maximum cap that the bank ignores in its calculation, and in an open ended guarantee the costs of proceedings reach the guarantor only from the moment payment was demanded of him (article 1827). Capitalised default interest, collection fees or sums above the cap are attacked as overclaiming under article 557.1.3 LEC and, if you are a consumer, as unfair terms under ground 7. The court must examine unfair terms of its own motion when ordering enforcement (article 552.1 LEC), but the fact that it did not does not relieve you of raising them.

The third front is time. The personal action against the guarantor is time barred five years after the debt became enforceable (article 1964.2 of the Civil Code), with a transitional regime for debts predating October 2015. Article 1975 provides that interruption of limitation against the debtor prejudices the guarantor only when it results from a court claim, not from out of court claims or private acknowledgments by the debtor. If your guarantee is joint and several, the bank will rely on article 1974, which extends interruption to all joint and several debtors, and the case law of the Tribunal Supremo has leaned towards applying it; even so, the bank must prove each interruption with a date and proof of receipt, and that is where many old claims fall.

If you end up paying, do not also lose what you are owed

Article 1838 requires the debtor to indemnify the guarantor who pays: the full amount of the debt, statutory interest from the time the debtor was told of the payment, the costs incurred after the debtor was informed of the demand, and any damages that apply. Article 1839 also subrogates the guarantor to all the rights the bank held against the debtor. Two details decide how much you recover: telling the debtor, because if you pay without informing him, article 1840 lets him raise against you every defence he had against the bank; and not settling blindly, because if you agree a reduction with the bank you can only claim from the debtor what you actually paid (article 1839 of the Civil Code), and that settlement has no effect on the debtor (article 1835 of the Civil Code).

If there are other guarantors, article 1844 allows you to claim from each his proportionate share, with the share of any insolvent one spread among the rest, but it requires the payment to have been made pursuant to a court claim or while the debtor was in insolvency proceedings. Paying voluntarily in response to a mere burofax, outside those cases, may cost you that action. And before paying, article 1843 allows you to proceed against the debtor when you are sued or when he falls into insolvency, to obtain release from the guarantee or security that protects you.

The debtor's insolvency does not release you. Article 492 of the consolidated Insolvency Act (TRLC) states that the discharge of unpaid debts does not affect creditors' rights against guarantors, who cannot rely on it, and that recourse claims are affected by the discharge on the same terms as the principal claim: the bank can collect from you and you may be unable to recover anything from the discharged debtor. If the figure exceeds what you can pay, the way out is not to put the house in a child's name, which opens the rescission action for fraud on creditors and the offence of concealing assets, but your own fresh start procedure, in which the guarantee debt can be discharged like any other bank debt.

How we run the case, step by step

1. 1

   We date the service and fix the last day

   We record the exact day you received the order opening enforcement and count ten working days, excluding Saturdays, Sundays, public holidays and August; for an order for payment, twenty. Everything else is organised backwards from that date, and nothing discussed with the bank moves it.

2. 2

   We gather what you signed and what was signed without you

   We obtain the complete policy, with the guarantee clause, and every later variation, refinancing, grace period or extension, checking who signed each one. Whatever the bank does not hand over now is demanded later within the proceedings.

3. 3

   We establish that you acted as a consumer

   We obtain the historical certificate from the Companies Registry for the debtor company, your employment record and your tax returns, to show that on the date of signing you were not a director or a significant shareholder and received nothing from the company.

4. 4

   We audit the bank's figures and the timeline

   We check whether the bank notified you of the balance before enforcing, whether the sum respects the cap of the guarantee and what the debtor owes, what interest and fees have been added and whether the action was time barred, with every interruption the bank can or cannot prove.

5. 5

   We file the opposition in time

   We raise first the procedural defects under article 559 LEC, such as the missing notice of the balance, and then the substantive grounds under article 557: limitation, overclaiming and unfair terms. A substantive opposition suspends the course of the enforcement, although attachments already made remain in place until it is decided.

6. 6

   We open the declaratory route and protect your reimbursement

   What the opposition does not admit, such as extinction by an extension or a variation made without your consent, is taken to declaratory proceedings after the prior negotiation attempt. In parallel, we notify the debtor in writing of the demand you received and, where appropriate, require him to release you from the guarantee or to give you security.

The law that applies

• Arts. 1822, 1830 y 1831 CC. By a guarantee one undertakes to pay or perform for a third party if that party does not, and where the guarantor undertakes joint and several liability the rules on joint and several obligations apply. The guarantor cannot be compelled to pay without the prior pursuit of the debtor's assets, but that benefit does not apply if he expressly waived it, if he bound himself jointly and severally, where the debtor is in insolvency proceedings or where the debtor cannot be sued in Spain. BOE-A-1889-4763
• Arts. 1851 y 1852 CC. An extension granted to the debtor by the creditor without the guarantor's consent extinguishes the guarantee. Guarantors, even joint and several ones, are released from their obligation whenever an act of the creditor prevents them from being subrogated to the creditor's rights, mortgages and privileges. BOE-A-1889-4763
• Art. 1975 CC. Interruption of limitation against the principal debtor by a court claim for the debt also takes effect against the guarantor, but the guarantor is not prejudiced by an interruption resulting from out of court claims by the creditor or private acknowledgments by the debtor. BOE-A-1889-4763
• Arts. 1838, 1839 y 1844 CC. A guarantor who pays must be indemnified by the debtor for the full debt, statutory interest from when the debtor was told of the payment, costs incurred after informing the debtor of the demand, and damages; he is subrogated to all the creditor's rights, although if he settled he may claim only what he actually paid; and he may claim from each co guarantor a proportionate share if he paid under a court claim or while the debtor was in insolvency proceedings. BOE-A-1889-4763
• Arts. 557 y 572.2 LEC. In enforcement based on non judicial instruments the debtor may oppose, within the time and in the form of article 556, only on payment, set off, overclaiming, limitation and lapse, documented reduction or extension of time, settlement in a public deed or unfair terms, and the opposition suspends the course of the enforcement. Where enforcement is for the balance of a deed or policy, it is ordered only if the creditor proves prior notice of the sum due to the debtor and to the guarantor. BOE-A-2000-323
• Art. 88 TRLGDCU. Treats as unfair in every case the imposition of guarantees disproportionate to the risk assumed, presuming there is no disproportion in financing or guarantee contracts agreed by financial institutions that comply with their specific rules, and the imposition on the consumer of a burden of proof that should fall on the other party. BOE-A-2007-20555
• Art. 492 TRLC. The discharge of unpaid debts does not affect creditors' rights against the debtor's joint and several co obligors, guarantors and other sureties, who cannot rely on it; recourse claims are affected by the discharge on the same terms as the principal claim. BOE-A-2020-4859
• Art. 5 LO 1/2025. In civil matters, for a claim in declaratory proceedings to be admitted it is a precondition to have first used an appropriate dispute resolution method, with the subject of the negotiation matching that of the dispute; it is not required to file an enforcement claim. BOE-A-2025-76

Each article checked against the consolidated text published in the BOE (the Spanish official gazette).

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