Criminal Cassation Appeal in Spain: Requirements, Grounds and Procedure (2026)

# Criminal Cassation Appeal in Spain: Requirements, Grounds, and Procedure (2026)

The criminal cassation appeal (recurso de casación penal) is the extraordinary means of challenge that allows the Supreme Court (Tribunal Supremo, Second Chamber) to review final judgments handed down by the Provincial Courts (Audiencias Provinciales) and the Superior Courts of Justice (Tribunales Superiores de Justicia, TSJ) in criminal matters. It is governed by Articles 847 to 902 of the Criminal Procedure Act (Ley de Enjuiciamiento Criminal, LECrim), as significantly reformed by Law 41/2015, of 5 October.

1. Appealable Decisions (Art. 847 LECrim)

Following the 2015 reform, the following decisions are subject to cassation:

On the grounds set out in Art. 849 (infringement of law and breach of procedural form):

• Judgments handed down by the Provincial Courts (Audiencias Provinciales) in second instance (on appeal) → before the Supreme Court (TS)
• Judgments handed down by the Superior Courts of Justice (TSJ) in second instance (on appeal of lower court judgments) → before the TS

*Only on grounds of violation of Art. 24 of the Spanish Constitution (CE)* (new Art. 852):

• Judgments of the Provincial Courts (Audiencias Provinciales) at first instance → before the TSJ
• Judgments of the TSJ at sole instance

The 2015 reform introduced universal second-instance criminal review, meaning that cassation is no longer the first appeal available against criminal judgments issued by the Provincial Courts; these are now first appealed before the TSJ, and only then in cassation before the TS.

2. Grounds for Cassation (Arts. 849–852 LECrim)

Art. 849.1: Infringement of Law (most commonly invoked ground)

Core conduct: where, given the proven facts established in the judgment, a substantive criminal provisión or another legal rule of equivalent nature that must be observed in the application of criminal law has been infringed.

Essential characteristics:

• The immutability of the factual narrative is the starting point: the TS cannot alter the established facts
• The challenge is confined to the legal characterisation: was the conduct correctly subsumed under the criminal offence?
• Typical errors: application of the wrong offence, error in degree of participation, error in the assessment of aggravating or mitigating circumstances

Examples of successful grounds:

• The judgment convicts for homicide when the correct charge should be gross negligence
• Premeditation (alevosía) is found without the established facts supporting it
• The mitigating circumstance of voluntary confession is not applied despite being reflected in the established facts

Art. 849.2: Factual Error in the Assessment of Evidence

Core conduct: existence of a factual error in the assessment of evidence, based on documents on the court file that demonstrate the trial court's mistake.

Very strict limits:

• The document must be self-sufficient (literosuficiente): capable of demonstrating the error on its own, without reference to other evidence
• It must not be contradicted by other means of proof
• Generally rejected: the TS takes the view that expert reports do not qualify as "documents" for cassation purposes

Accepted documents: public deeds, final judgments, documents acknowledged by both parties, certain expert reports in exceptional circumstances.

Art. 850: Breach of Procedural Form (Procedural Violations)

The most frequently invoked grounds:

Art. 850.1: where a piece of evidence has been refused, having been applied for in due time and form by the parties and considered relevant; provided the appellant lodged a formal objection (protesta) at the time of refusal.

Art. 850.3: where the judgment under appeal resolved issues that were not the subject of the proceedings, or failed to resolve all issues that were (incongruity).

Art. 850.4: where the right of defence was violated by denying counsel the opportunity to present their closing submissions (informes de calificación).

Art. 851: Breach of Procedural Form in the Judgment

Art. 851.1: where the judgment does not express clearly and unequivocally which facts are considered proven, or where there is a manifest contradiction between them, or where legal concepts that, by their nature, predetermine the outcome are stated as proven facts.

Predetermination of the outcome (predeterminación del fallo): one of the most frequently invoked grounds. It occurs when the judgment uses in the statement of proven facts legal terms specific to the offence charged (e.g., "the accused, acting wilfully..." in the proven facts) instead of narrating the actual conduct factually.

Art. 851.3: where the judgment fails to rule on all the issues raised by the prosecution and defence (omissive incongruity).

Art. 852: Violation of Fundamental Rights

This ground, introduced by Organic Law 19/2003, allows a party to invoke the violation of fundamental rights recognised in the Spanish Constitution (CE), in particular:

• Presumption of innocence (Art. 24.2 CE): where there is no sufficient and lawfully obtained prosecution evidence
• Right to effective judicial protection (tutela judicial efectiva) (Art. 24.1 CE): lack of reasoning, incongruity
• Fair trial rights (Art. 24.2 CE): defence, evidence, impartial judge

3. Lodging the Appeal (Arts. 855–857 LECrim)

Time limit: 5 days from notification of the judgment on appeal to file the written notice of appeal (escrito de preparación). This time limit is strict; failure to comply is a ground for inadmissibility.

Written notice of appeal (Art. 856 LECrim): must include:

• Identification of the judgment being challenged
• Ground(s) for the appeal (Art. 849.1, 849.2, 850, 851 or 852)
• Summary of the provisión infringed or the evidence refused
• Confirmation that the issue was raised before the lower court (protesta), where applicable

Admission by the Provincial Court or TSJ: within 3 days, the court that issued the judgment decides whether the appeal meets the formal requirements. If admitted, the parties are summoned to appear before the TS.

4. Formalisation of the Appeal (Arts. 858–874 LECrim)

Once summoned, the appellant has 30 days to file the written grounds of appeal (escrito de formalización) before the TS, which must:

• Develop the grounds announced in the written notice of appeal
• Cite the provisions infringed
• Set out how the judgment should be reversed

Admissibility ruling by the TS: the Second Chamber may declare the appeal inadmissible by reasoned order where it is manifestly unfounded (Art. 884 LECrim).

5. Determination (Arts. 888–902 LECrim)

Dismissal: the judgment under appeal is upheld.

Upholding the appeal:

• For infringement of law (Art. 849): the TS issues a second judgment without remitting the case to the lower court
• For breach of procedural form (Arts. 850–851): the TS sets aside the judgment and remits the proceedings for the lower court to remedy the defect
• For violation of Art. 24 CE (Art. 852): the TS generally issues a second judgment acquitting the appellant

6. The Cassation Appeal for Unification of Doctrine

In addition to the ordinary cassation appeal, a specific appeal exists in the military criminal jurisdiction and in the abbreviated procedure (procedimiento abreviado) to unify contradictory doctrine between Provincial Courts (Audiencias Provinciales).

7. Key Case Law

STS (Supreme Court Judgment) 924/2019, of 5 February: on the application of the Art. 849.1 ground; the TS cannot review the assessment of evidence heard at trial; it can only verify whether the legal characterisation corresponds to the established facts.

STS 1234/2021: on predetermination of the outcome; the use of terms such as "with intent to profit" or "wilfully" in the statement of proven facts constitutes predetermination; the specific conduct must be narrated factually instead.

STS 456/2022: on the presumption of innocence as a cassation ground; the TS may review whether sufficient and lawfully obtained prosecution evidence existed, but cannot re-evaluate the credibility of witnesses.

8. Cassation Strategy

Preparation: identify in the appeal judgment any errors of legal characterisation, procedural violations accompanied by a timely formal objection (protesta), and possible violations of Art. 24 CE.

Structuring the grounds: combining Art. 849.1 (infringement of law) with Art. 852 (violation of Art. 24 CE) maximises the prospects of success. Art. 849.2 is subject to very restrictive admissibility standards.

The formal objection requirement: for grounds based on breach of procedural form, lodging a formal objection (protesta) at the appropriate procedural stage is a conditio sine qua non. Without a timely objection, the ground is inadmissible.

Lexiel identifies the TS case law on cassation grounds applicable to the case (infringement of law, breach of procedural form, presumption of innocence), analyses whether the appeal judgment contains errors susceptible to cassation, and drafts both the written notice of appeal and the written grounds of appeal.