Sentence Consolidation and Unrelated Pre-Trial Detention: STS 188/2026

Sentence consolidation is one of the most practically significant institutions in Spanish penitentiary law from a defence perspective. Article 193.2 of the Prison Regulations (Reglamento Penitenciario) allows multiple sentences to be computed as a single unit for access to day-release permits, third-degree reclassification and conditional release, provided no period of effective liberty has occurred between them. STS 188/2026, of 4 March, precisely delimits when the continuity of deprivation of liberty genuinely justifies that linking — and when it does not.

The facts: pre-trial detention for unrelated offences

The case decided by the Second Chamber presents a situation commonly encountered in penitentiary practice: a prisoner who is at liberty after having served or having had a sentence expire is arrested and placed in pre-trial detention — not for the cause that gives rise to the new sentence, but for entirely different criminal acts. That pre-trial detention is eventually lifted or converted, and the individual is ultimately convicted of the new offences. The question before the Chamber was whether, in those circumstances, Article 193.2 of the Prison Regulations can be applied to link the earlier sentence — already served — to the new one, for the purpose of calculating the maximum term to be served.

The problem is not merely theoretical. If linking were permitted, the calculation of penitentiary time-limits could be more favourable to the prisoner, treating as a single unit periods of deprivation of liberty that in reality correspond to separate criminal proceedings. The Chamber addresses this directly.

The Supreme Court's ruling

The Chamber concludes that linking is not permissible. The central reasoning of STS 188/2026 rests on the requirement for genuine — not merely formal — penitentiary continuity. Article 193.2 of the Prison Regulations presupposes that the absence of liberty between sentences is attributable to the enforcement system itself: the prisoner was not released because subjection to the earlier sentence transformed directly into service of the new one.

Where the deprivation of liberty arises not from the sentence being served or the new sentence, but from pre-trial detention ordered in an unrelated case, that material link is absent. The Chamber rejects the view that the mere physical continuity of incarceration — the prisoner having never set foot outside the centre — suffices to activate Article 193.2 PR. What matters is not whether the individual physically left the establishment, but the legal cause of the deprivation of liberty.

Sentence linking, Art. 58 CP and the Art. 76 CP maximum

The ruling connects its doctrine to Articles 58 and 76 of the CP. Article 58 CP governs the crediting of pre-trial detention: time spent on remand is credited against the sentence provided the cause of detention is the same as that which gives rise to the conviction. Where the pre-trial detention relates to a different case, that time cannot be deducted from the new sentence.

Article 76 CP sets the maximum effective term when a prisoner accumulates multiple sentences. The Chamber emphasises that these limits operate rigorously: they do not admit shortcuts that would allow periods of deprivation of liberty attributable to unrelated causes to be incorporated into the calculation. Permitting linking in the scenario under analysis would effectively extend the credit beyond what the legislature envisaged, and would undermine the coherence of the criminal enforcement system.

The prison-law relationship does not equal linking

A technically significant aspect of the judgment is that the Chamber acknowledges the prison-law relationship is not formally broken in these cases: the prisoner remains in State custody. However, the Chamber clearly distinguishes two planes: the continuity of deprivation of liberty as a physical fact, and the legal basis supporting it.

The prison-law relationship is a broader category than sentence linking. A prisoner may remain continuously deprived of liberty and yet have no right to linking if the cause of that deprivation is pre-trial detention for different offences. The judgment thus makes clear that Article 193.2 PR has its own substantive prerequisite that is not exhausted by physical continuity but requires a causal connection to the sentences sought to be linked.

Practical significance for penitentiary defence

STS 188/2026 is essential reading for any file in which the prisoner has undergone a period of pre-trial detention for unrelated offences between the service of successive sentences. Its practical implications are several.

First, the penitentiary administration and supervisory courts must verify the specific cause of the pre-trial detention before applying Article 193.2 PR. An automatic application of linking without that analysis will be contrary to the doctrine laid down. Second, a defence challenging a refusal to consolidate must demonstrate that the deprivation of liberty between sentences was not caused by unrelated proceedings but by the enforcement system itself. Third, where linking is sought to be denied, the authority doing so must justify that the pre-trial detention targeted acts different from those underlying the new sentence.

The ruling is also relevant to accumulation proceedings conducted under Article 988 of the LECrim, since the calculation of the Article 76 CP maximum term may be affected by the same logic: periods of deprivation of liberty whose cause is unrelated to the accumulated sentences cannot be incorporated into the computation.