Change of registered sex and gender-based violence: what Supreme Court Judgment 517/2026 clarifies

The facts and the Supreme Court's decision

The proven events occurred on 20 April 2022. During an incident concerning the handover of a minor daughter, the accused assaulted his former partner and gripped the child forcefully. Criminal Court No. 3 in Castellón convicted him, among other findings, of a gender-based violence offence under Article 153(1) of the Spanish Criminal Code and of domestic violence against the child. The Provincial Court upheld the judgment.

The amendment of the registered sex was approved on 1 June 2023, after the events and also after the first-instance judgment. The cassation appeal argued that the appellant's current registration as a woman prevented the conviction under Article 153(1) from being upheld. That provision addresses violence by a man against a woman who is or has been his wife, or who is or has been linked to him by a comparable intimate relationship.

The Criminal Chamber dismissed the appeal in Supreme Court Judgment 517/2026 of 22 July, ECLI:ES:TS:2026:3579. It considered it decisive that, when the events occurred, the convicted person was legally registered as a man and had the relationship with the victim required by the offence. The later registry amendment could not operate retrospectively to change that classification.

Why the later change has no retrospective effect

Article 46(1) of Law 4/2023 states that a registry amendment takes constitutive effect from its entry in the Civil Registry. Paragraph 3 adds a specific rule: the amendment does not alter the legal regime that applied before registration for the purposes of Organic Law 1/2004 on comprehensive protection against gender-based violence.

The judgment applies that legislation to Article 153(1) of the Spanish Criminal Code. It does not question the rights arising from the new registry status or make gender identity the subject of the trial. The criminal-law issue is narrower: which legal regime applied to conduct that had already occurred on a particular date.

The timeline is therefore essential. The date of the events, the start of the registry proceedings, the decision and its registration must be distinguished. A later application or registration does not retrospectively alter the legal elements that existed when the conduct occurred.

The Supreme Court does not presume fraud from a change of registered sex

The Chamber also addresses a different scenario: the registry amendment predates the offence and is alleged to have been used to evade the law. Possible evasion of the law could then be examined, but the Court requires full and unequivocal proof of a fraudulent purpose.

The judgment itself warns that a registry change alone does not justify a presumption of fraud. The courts must assess the specific circumstances. This qualification prevents an automatic conclusion and is important so that the legitimate exercise of a right is not confused with an attempt to evade the law.

Moreover, that second scenario was not the necessary basis of the decision: in the case before the Court, the registry amendment came after the events. The appeal was dismissed because there was no retrospective effect. Applying the reference to fraud indiscriminately to other proceedings would go beyond what the Chamber actually decided.

Practical consequences for a complaint or a defence

In gender-based violence proceedings, dates and Civil Registry documents may be relevant to determining the applicable law, jurisdiction and legal classification. Civil Registry decisions should be provided and an accurate timeline prepared, without losing sight of the core issues: evidence of the events, injuries, statements, measures in force and the relationship that existed at the time under investigation.

For the victim, a later registry amendment does not erase the protection that applied when the events occurred. For the defence, invoking the current registry status is not enough either: the timing of the conduct, the precise accusation and the elements of each offence must be examined. If the amendment predates the events, any allegation of fraud must be proved and cannot be assumed.

The decision provides a specific temporal rule, not a universal answer to every criminal-law issue connected with registered sex. Other offences, aggravating factors, interim measures or prison-law questions may depend on different rules and require their own analysis.

Criminal-law advice in Tenerife

If there is a complaint, summons or measure connected with gender-based violence, the timeline, documents and procedural position should be reviewed from the outset. The firm can examine the matter from either the prosecution or defence perspective, with respect for the rights of everyone involved.

You can request a consultation with Abogado Juan in Santa Cruz de Tenerife, by phone or video call. The legal answer depends on the proven facts and the stage of the proceedings; this commentary explains one particular judgment and does not predict the outcome of any case.