New single form for constitutional remedies: what changes from September 2026

Key data

Lawyers and solicitors handling constitutional remedy applications before the Constitutional Court must adapt their workflow before September 15, 2026. The Plenary of the Constitutional Court approved on June 10, 2026 a new electronic system that merges into a single standardized form what were previously two separate documents: the form and the application. The regulatory reference is the Agreement published in the BOE on June 12, 2026 (BOE-A-2026-12768).

The change is significant in operational terms: it involves reviewing work templates, document preparation processes and internal workflows of law firms managing this type of proceedings.

What does this regulation establish?

The new agreement of the Plenary of the Constitutional Court introduces the following specific changes compared to the previous system:

Regarding attached documents, the agreement establishes three cumulative requirements that must be met in each filing:

• Editable format: attached documents cannot be presented in read-only or scanned image format.
• One file per document: each attached document must be in a separate file, without grouping multiple documents in the same file.
• Identifying name: the file name must allow clear identification of its content.

The possibility of exceeding the 50,000 characters exists, but requires prior reasoned authorization. It is not an automatic right: the law firm must justify the exceptional circumstances that warrant it before filing the application.

Economic and operational impact

The direct impact of this regulation is primarily operational, not economic in terms of new fees or direct costs. However, it has relevant practical consequences for law firms managing constitutional remedy applications:

• Review of internal templates: the constitutional remedy application models used by law firms must be adapted to the new single form before September 15, 2026.
• Extension control: the limit of 50,000 characters with spaces requires reviewing the structure and usual length of written submissions. Law firms working with longer applications will need to establish a protocol to request reasoned authorization when necessary.
• Attachment management: the requirement for editable format, one file per document and identifying name implies reviewing document preparation workflows, especially in cases with numerous annexes.
• Arguments phase without limit: once the application is admitted, all parties have a submission of arguments procedure without extension limit, allowing arguments to be developed with greater breadth in that later phase.

Who does it affect?

• Lawyers filing or handling constitutional remedy applications before the Constitutional Court.
• Solicitors acting in constitutional remedy proceedings.
• Citizens who, in legally provided cases, file constitutional remedy applications directly.
• Law firms with practice in constitutional law or litigation before the Constitutional Court.
• Legal departments of companies, public bodies or entities that are parties in constitutional remedy proceedings.

Practical example

A law firm specializing in constitutional law has a constitutional remedy application pending in October 2026. Until now, its workflow consisted of completing the form on the Constitutional Court's electronic office and attaching the application as a separate document.

From September 15, 2026, that law firm must:

1. Draft the application directly in the new standardized single form, ensuring it does not exceed 50,000 characters with spaces.
2. If the application exceeds that limit due to case complexity, request prior reasoned authorization from the Court before filing it.
3. Prepare attached documents in editable format, in individual files (one per document) and with file names that clearly identify their content (for example: "first-instance-judgment.docx", "inadmissibility-order.docx").
4. Once the application is admitted, it will be able to develop its arguments with greater breadth in the arguments submission procedure, which has no extension limit.

What should professionals do now?

1. Review constitutional remedy application templates before September 15, 2026 and adapt them to the new standardized single form available on the Constitutional Court's electronic office.
2. Establish extension control in written submissions: verify that the text does not exceed 50,000 characters with spaces before filing. If that threshold was usually exceeded, define an internal protocol to request reasoned authorization when necessary.
3. Update the attachment management protocol: ensure that all attached documents are presented in editable format, in individual files and with identifying names. Communicate this change to all professionals in the law firm handling this type of applications.
4. Identify constitutional remedy applications in progress whose filing is scheduled after September 15, 2026 and apply the new system from that date.
5. Consult the Constitutional Court's electronic office to access the new standardized model as soon as it is available, without waiting until the last moment.

Official source

Consult complete regulation at official source

Notice: This article is for informational purposes only and does not constitute legal advice. For specific decisions, consult a qualified professional. Source: https://www.boe.es/diario_boe/txt.php?id=BOE-A-2026-12768