Private Prosecution in Spain: How to Join a Criminal Case

🇪🇸 Read the original in Spanish

When a person is the victim of a crime in Spain, the emotional and financial impact can be devastating, leaving a deep sense of helplessness. Faced with this situation, the Spanish judicial system does not force the victim to be a mere passive spectator of the process, but instead grants them the power to become an active party to defend their rights and interests. Through the figure of the private prosecution, anyone harmed by a criminal act can appear in the criminal case alongside the Prosecution Service, requesting not only the conviction of the guilty party but also the corresponding compensation for the damages suffered. In this detailed guide, written by the legal team at AbogadoAI, we explain step-by-step how to exercise this right, what the legal requirements are, and how to ensure your voice is heard clearly and strongly before the Spanish courts.

What is a private prosecution and who can exercise it?

The acusación particular (private prosecution) is the legal figure that allows the victim or offended party of a crime to actively appear as a party in a criminal proceeding. Unlike other legal systems where the state holds a monopoly on prosecution through the Ministerio Fiscal (Prosecution Service), Spanish procedural law grants a leading role to the directly affected citizens.

The constitutional and legal framework

The foundation of this figure is found in the Spanish Constitution of 1978 itself, which in its Article 24 enshrines the right to effective judicial protection. Likewise, the reference procedural regulation is the Ley de Enjuiciamiento Criminal (LECrim) (Criminal Procedure Act), which regulates in detail who, how, and when this action can be exercised.

Specifically, Article 110 of the LECrim establishes that those harmed by a crime who have not waived their right may appear in the case as a prosecuting party, exercising the corresponding criminal and civil actions.

Who can appear as a private prosecution?

• The direct victim of the crime: The natural or legal person who suffers the criminal conduct (for example, the owner of the stolen property or the assaulted person).
• Indirect victims: In cases of homicide or the death of the direct victim, their heirs, spouse, common-law partner, children, or closest relatives can appear to demand justice and civil reparation.
• Legal entities: Companies, associations, or foundations that suffer direct economic or reputational damage due to a crime.

Crucial difference: Private Prosecution vs. Popular Prosecution vs. Civil Claimant

It is very common to confuse these three concepts, but their procedural differences are substantial:

• Acusación particular (Private prosecution): Exercised by the offended party or direct victim of the crime. It does not require posting a fianza (security deposit/bond) to appear.
• Acusación popular (Popular prosecution): Exercised by any citizen or association who, without being a direct victim of the crime, appears in defense of social legality (based on Article 125 of the Constitution). It usually requires the payment of a fianza and is formalized through a querella (formal criminal complaint).
• Actor civil (Civil claimant): A person who only intervenes in the criminal process to claim the restitution of the object, reparation of the damage, or compensation for material and moral damages (responsabilidad civil / civil liability), without requesting prison sentences for the accused.

Substantive requirements: What does Spanish legislation say?

For the appearance as a private prosecution to be admitted by the Juez de Instrucción (Investigating Judge), certain substantive and formal requirements provided for in the Criminal Procedure Act and the Código Penal (Criminal Code - Organic Law 10/1995) must be strictly met.

1. The existence of a prosecutable crime

The private prosecution can be exercised in public crimes (such as homicide, robbery, fraud, or assault) and in semi-public crimes (those that require a prior complaint from the aggrieved party, such as harassment or the disclosure of secrets). In private crimes (calumny and insults against private individuals), the private prosecution takes the form of a mandatory private querella, being the only party that sustains the prosecution, as the Prosecutor does not intervene in these cases.

2. Mandatory procedural representation: Lawyer and Court Procurator

Except for very specific exceptions (such as filing an initial complaint or in certain trials for delitos leves [minor offences] where the presence of professionals is not mandatory, although highly recommended), to formally appear as a private prosecution in a criminal process it is strictly mandatory to have the representation of a Procurador de los Tribunales (Court Procurator) and the defense of a practicing Abogado (Lawyer).

• The Abogado will handle the legal strategy, draft the indictment documents, propose evidence, and conduct cross-examinations during the trial.
• The Procurador will hold the technical representation, receive notifications from the court, and submit documents signed by the lawyer.

3. The offering of actions

Article 109 of the LECrim obliges the Letrado de la Administración de Justicia (Court Clerk, formerly known as Secretario Judicial) to inform the victim, at the time of taking their statement or during their first appearance, of their right to become a party to the process (the so-called ofrecimiento de acciones [offering of legal actions]). If the victim accepts at that moment, the path for their formal appearance begins.

Practical steps: How to join the process step-by-step

If you have been the victim of a crime and wish to take control of the prosecution, you must meticulously follow these procedural steps:

Step 1: Prior complaint or formal criminal complaint

The criminal process can begin with a denuncia (complaint) filed with the National Police, the Civil Guard, or directly at the Juzgado de Guardia (Duty Court). It can also be initiated through a criminal querella drafted by your lawyer. If an investigation is already underway (diligencias previas [preliminary proceedings]), you will skip directly to step 3.

Step 2: Appointment of professionals (Lawyer and Procurator)

You must hire a lawyer and a procurator of your trust. If you lack sufficient financial resources, you have the right to request the benefit of Justicia Gratuita (Free Legal Aid) before the Bar Association of your province, provided you meet the income thresholds established by law.

Step 3: Granting power of attorney

For the procurator to act on your behalf in court, you must grant them representation powers. This is done in one of two ways:

1. Poder Notarial para Pleitos (Notarial Power of Attorney for Lawsuits): This is done before any Notary in Spain. It has an approximate cost of between €30 and €60.
2. Apoderamiento "Apud Acta" (Apud Acta Power of Attorney): This is a completely free procedure carried out by physically appearing before the Letrado de la Administración de Justicia of any court in Spain, or online through the Electronic Judicial Portal of the Ministry of Justice using a digital certificate or Cl@ve.

Step 4: Submission of the appearance document

Your lawyer will draft an Escrito de Personación en concepto de Acusación Particular (Written Request to Appear as a Private Prosecution). In this document, which will also be signed by your procurator, the case number will be identified (for example, Diligencias Previas 123/2024), along with the court investigating the case and your personal details. It will formally request that you be recognized as a prosecuting party, requiring that all resolutions issued from that moment on be notified to you.

Step 5: Admission by the Investigating Judge

The Judge will issue an Auto (Judicial Order) or Providencia (Procedural Ruling) admitting your appearance. From this procedural milestone, your lawyer will have full access to the court file, can request the taking of evidence (witness statements, expert reports, reconstructions of events), appeal decisions of the judge they disagree with, and, finally, present the indictment requesting the corresponding prison sentences and compensation.

Deadlines, costs, and key figures you must know

Success in a criminal process largely depends on rigorous compliance with procedural timelines. In Spanish criminal law, deadlines cannot be extended.

• Deadline to appear: In accordance with Article 110 of the LECrim, you can appear as a private prosecution at any time during the process before the indictment stage (trámite de calificación del delito). This means the absolute limit is the moment the Investigating Judge issues the Auto de Pase a Procedimiento Abreviado (Order to Proceed to Abbreviated Procedure) and transfers the case to the parties to present their indictments. If you try to appear after this moment, your appearance will be denied to avoid undue delays, although you will retain the right to exercise civil action for restitution.
• Deadline to indict and request penalties: Once the Judge transfers the case to present the indictment, the general deadline is 10 business days (in the Abbreviated Procedure, regulated in Article 780 of the LECrim).
• Estimated financial costs:
• Court fee: €0. Natural and legal persons are exempt from paying court fees in the criminal jurisdiction in Spain.
• Fianza (Security deposit): €0. Unlike the popular prosecution, the private prosecution does not have to pay any bond to exercise criminal action.
• Lawyer and Procurator fees: These vary depending on the complexity of the case, the severity of the crime, and the guidelines of each Bar Association. For a medium-scale fraud case, defense fees can range between €1,500 and €4,500, while the procurator's fees usually sit between €150 and €500.
• Legal costs: If the accused is convicted, the court may order them to pay the costas procesales (legal costs), which means the convicted party will have to reimburse the expenses of your lawyer and procurator (subject to certain legal limits).

Concrete examples of appearing and claiming damages

To understand how the private prosecution operates in practice and how claims are calculated, let us analyze two common scenarios:

Example 1: Financial fraud crime

Imagine that Carlos hires a contractor for a home renovation who turns out to be a fraudster. Carlos transfers an advance of €12,000 for the purchase of materials, but the contractor disappears with the money without doing any work.

Carlos files a complaint, and the court opens Diligencias Previas for an alleged crime of fraud (regulated in Article 248 and following of the Criminal Code). Carlos decides to appear as a private prosecution by hiring a lawyer and a procurator.

By actively appearing, Carlos's lawyer requests the Judge to investigate the bank accounts of the suspect and to decree the preventive seizure of their assets to secure the return of the money. In the indictment, Carlos's lawyer requests:

1. A sentence of 2 years in prison for the accused (criminal penalty).
2. The return of the defrauded €12,000, plus the legal interest accrued since the day of the transfer (civil liability).
3. The payment of €1,500 for moral damages due to the stress and anxiety caused, duly proven with medical reports.
4. An order for the defendant to pay the legal costs, so Carlos can recover what he invested in his lawyer and procurator.

Example 2: Injury crime in a traffic accident involving drunk driving

María is run over at a pedestrian crossing by a driver whose blood alcohol level is four times the legal limit. María suffers a tibia and fibula fracture requiring surgery. The driver is charged with a crime against road safety in combination with a crime of injuries caused by gross negligence.

María appears as a private prosecution. Her lawyer proposes an independent forensic medical expert report as key evidence. At the end of the investigation, María's indictment requests:

1. The withdrawal of the accused's driving license for 3 years and a 1-year prison sentence.
2. Compensation (civil liability) broken down according to the Scale for Traffic Accidents:

• 90 days of moderate loss of quality of life (healing period) at €67/day: €6,030.
• 30 days of severe loss of quality of life (hospitalization and post-surgery) at €90/day: €2,700.
• 5 points of sequelae (permanent functional and aesthetic damage/scars): €4,800.
• Medical rehabilitation expenses not covered by the public health system: €850.

1. Total claimed for civil liability: €14,380, for which the driver's insurance company will be directly liable, and the driver subsidiarily liable.

Common mistakes you must avoid

Appearing in a criminal proceeding requires precision and strategy. Making certain mistakes can weaken your position or even cause you to lose your right to claim:

• Letting the deadlines to appear pass: Waiting until the trial date is set to look for a lawyer is a critical mistake. If the Judge has already closed the investigation phase and the oral trial has begun, you can no longer appear as a private prosecution to request prison sentences; you can only intervene to claim civil compensation if you had not previously waived it.
• Confusing criminal and civil routes for the claim: If you decide to appear in the criminal court, you must know that you cannot start a parallel civil process for the same facts. The civil claim is joined within the criminal process itself, unless you make an "express reservation of civil action" to exercise it before the civil courts once the criminal trial ends.
• Failing to provide documentary evidence of material damage: It is not enough to say that the crime caused you financial losses; every euro claimed must be backed by invoices, repair estimates, expert reports, or bank statements. Mere estimates or guesswork are usually rejected by judges.
• Failure to appear at court summonses: If you appear as a private prosecution and are summoned to testify or to be examined by the court's Forensic Medical Doctor, you must attend. Failing to show up without a duly justified force majeure cause can lead to fines and severely damage the credibility of your prosecution.

Frequently Asked Questions (FAQ)

Can I appear as a private prosecution if I don't have money to pay for a lawyer?

Yes, absolutely. The Spanish Constitution guarantees the right to free legal assistance to those who prove insufficient resources to litigate. If you meet the economic requirements established by the Free Legal Aid Act, the Bar Association will assign you a court-appointed Lawyer and Procurator 100% free of charge, and you will be exempt from paying any expenses derived from court-ordered expert reports.

What happens if the Prosecution Service is already prosecuting? Is it necessary for me to appear too?

It is not strictly mandatory, as the Ministerio Fiscal has a constitutional duty to exercise criminal and civil action in defense of victims. However, it is highly recommended to appear. The Prosecutor handles hundreds of cases simultaneously and may not request the maximum penalty, or their assessment of civil damages may be lower than the actual loss. By appearing with your own lawyer, you guarantee an exclusive, personalized defense focused solely on your interests.

Can I withdraw the private prosecution once I have appeared?

Yes, you can withdraw from the criminal process at any time (known as apartamiento de la acción). However, you must bear in mind that in public crimes (such as robbery, homicide, or fraud), even if you withdraw, the criminal process will continue if the Prosecution Service decides to proceed with the prosecution. In purely private crimes, your withdrawal (or the forgiveness of the offended party) will result in the immediate dismissal of the case.

Do I have to pay the court costs if the accused is acquitted?

As a general rule, no. In Spanish criminal proceedings, legal costs are only imposed on the private prosecution if the court considers that they acted with "recklessness or bad faith" (for example, presenting an accusation knowing that the facts were false or without any type of evidence). If you acted in good faith as the victim of a crime, even if the accused is ultimately acquitted due to a lack of sufficient evidence, you will not be ordered to pay the defense's costs.

If I am a foreigner residing in Spain, do I have the same rights to appear?

Yes, exactly the same. The Spanish legal system and the Estatuto de la Víctima del Delito (Statute of the Victim of Crime) guarantee protection and access to justice to anyone who suffers a crime on Spanish territory, regardless of their nationality, administrative status, or legal residence. Additionally, you have the right to request a free interpreter during all court proceedings if you do not understand Spanish.

In summary

• Active right: The private prosecution allows victims of a crime to directly intervene in the criminal process to request prison sentences and financial compensation.
• Mandatory representation: It is essential to act under the guidance of an Abogado and the representation of a Procurador, through a power of attorney or a free apud acta appointment.
• No initial financial barriers: No court fees or security deposits are required for the direct victim to appear.
• Critical deadline: The appearance must be formally requested during the investigation phase, always before the indictment stage of the crime.
• Joinder of actions: It allows you to claim both the criminal punishment of the offender and civil compensation for all damages and losses suffered in the same trial.

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.