Prison Time Is Service of Sentence, Not “Credit for Time Served”: No Double-Credit and No Parolee Elapsed-Time Credit

Introduction

In L. Short v. Salmonsen (Mont. Feb. 24, 2026), the Montana Supreme Court addressed a recurring sentence-administration dispute: whether an inmate can obtain additional “credit for time served” by aggregating jail, prison, and placement time across multiple concurrent sentences and revocations—especially where the Department of Corrections (DOC) has recalculated credits after receiving final written judgments.

The petitioner, Laurance Eric Short, sought habeas relief, claiming he was owed more than 1,300 days of credit across a series of sentences and revocations spanning 2013 through 2024. The respondent (the DOC, via prison administration) maintained that the controlling credits were those reflected in the final written judgments and that Short’s claim improperly sought “double credit,” particularly for time spent in Montana State Prison (MSP) and other DOC placements.

The key issues were (1) the legal boundary between “credit for time served” and time that is simply the service of a sentence; (2) whether concurrency/“merger” principles allow stacking credit beyond actual presentence detention; and (3) whether time in facilities or placements (holding, CCP West, prerelease) could be awarded as “elapsed time credit,” particularly where Short was on parole rather than probation.

Summary of the Opinion

The Court denied and dismissed Short’s petition for writ of habeas corpus. It held that Short had already received all credit available under the final written judgments and applicable law, and that the DOC’s earlier suggestion Short might be entitled to an additional 896 days was legally incorrect because it treated time served in prison as if it were “credit” that could be added again to reduce sentence length.

The Court further held Short was not entitled to additional “elapsed time credit” for 424 days spent in the Butte Holding Facility, CCP West, and MCPS prerelease placements, because Short was a parolee during that time, and the record did not support awarding such credit.

Analysis

Precedents Cited

State v. Kortan, 2022 MT 204, § 18, 410 Mont. 336, 518 P.3d 1283

The DOC invoked State v. Kortan for “the principle that unrelated sentences merge when run concurrently,” arguing that because Short was continuously confined (jails/prison) between May 26, 2020 and April 4, 2024, he should receive additional credit on the revocation sentence.

The Court’s treatment of State v. Kortan is clarifying: concurrency/merger principles do not convert post-sentence incarceration (i.e., time served in prison on an existing sentence) into additional “credit for time served” against a later revocation term. In other words, even if sentences run concurrently, the concept of “credit” remains tethered to legally creditable detention time (typically presentence or otherwise creditable confinement) and cannot be used to “double count” prison time already served as the sentence itself.

Gonzalo v. Green, No. OP 25-0049, 2025 Mont. LEXIS 387, Order, at *3-*5 (Apr. 15, 2025)

The Court relied on Gonzalo v. Green when addressing whether time in a holding center, CCP West, prerelease (MCPS/MCSP), or house arrest is creditable under § 46-18-203(7)(b), MCA. The Court agreed with the DOC’s position (as supported by Gonzalo) that such time was not creditable as “credit for time served” in the manner Short sought—particularly when framed as a substitute for jail-time credit.

While Gonzalo v. Green is an order and not a full merits opinion, its citation here signals the Court’s continued adherence to a restrained approach: credit is governed by statute and judgment terms, and not every form of DOC placement time is interchangeable with jail-time credit.

Legal Reasoning

1) “Credit for time served” is not the same as time served in prison

The Court drew a bright practical and legal line: time served in prison is service of the sentence, not a separate credit that can be applied again to shorten the same (or another concurrent) sentence. Citing §§ 46-18-201(9) and 46-18-203(7)(b), MCA, the Court explained that presentence detention credit alters the sentence commencement/ending dates, whereas prison time does not “credit” the term—it simply is the term being served. Awarding both would create an impermissible double credit.

This reasoning directly rejected the DOC’s suggested additional 896 days. The Court identified that 673 of the days Short sought to “credit” were MSP prison days; counting them again would double count time already served.

2) The arithmetic “cap” on jail-time credit is actual jail days during the claim period

Using the DOC’s Location Term Listing, the Court treated the record as establishing a maximum possible additional jail-credit universe once prison days were removed. It then compared that universe to the credits already awarded by the written judgments (including credit totals in multiple cases). Even acknowledging some ambiguity because several judgments listed totals rather than precise date ranges, the Court concluded that the credits already awarded during the claim period exceeded the remaining jail-day maximum—confirming Short had already received all possible additional jail credit.

3) Final written judgments control the DOC’s sentence calculation

The Court accepted the DOC’s affidavit that earlier calculations were outdated and that the revised calculation (Sept. 4, 2025) properly implemented the final written judgments. The habeas claim failed because the revised calculation reflected the correct credits (e.g., 131 days on the 2024 DUI sentence; 171 days on the 2018 sentence) and there was no legal basis to go beyond the judgments with aggregated credit theories.

4) “Elapsed time credit” was unavailable for Short’s 424 days because he was on parole

The Court scrutinized the revocation hearing transcript and DOC records and found Short was a parolee during the 424 days in the Butte Holding Facility/CCP West/MCPS. It contrasted parole supervision under § 46-23-1021, MCA with probation supervision under § 46-23-1011, MCA, emphasizing that DOC “retains custody” of parolees. On that basis, the Court concluded Short was not entitled to the elapsed-time credit he sought.

Impact

  • Clarifies anti-double-credit rule in concurrent/revocation contexts: Even where sentences run concurrently (and even accepting “merger” language), an inmate cannot repackage time already served in prison as additional “credit for time served” to reduce the term again.
  • Reinforces “judgment controls” administration: Habeas challenges to DOC calculations will likely fail where DOC can demonstrate the calculation matches the final written judgments, even if earlier internal calculations differed.
  • Limits “elapsed time credit” arguments for parolees: The decision signals that elapsed-time credit theories face steep barriers where the defendant was on parole (DOC custody retained), and where the district court expressly declined to award such time (beyond any limited credit it did grant).
  • Encourages precise credit findings in sentencing judgments: The Court noted practical difficulty where judgments list only totals rather than date ranges. Future litigation may press district courts to specify creditable date periods to reduce later disputes.

Complex Concepts Simplified

  • “Credit for time served” (jail credit): Days counted against a sentence because the person was detained before sentencing (or in other statutorily creditable detention). This typically reduces the remaining time to be served because it moves the sentence’s effective start earlier.
  • Service of sentence (prison time): Once sentenced to prison, each day in prison is not a “credit” added later; it is the sentence being served. Counting it again as “credit” would be double counting.
  • Concurrent sentences: Two sentences served at the same time. Concurrency does not automatically mean a person can stack credits from one case onto another beyond what the sentencing court awarded and what the statutes permit.
  • Parole vs. probation: Probation is typically a suspended sentence with community supervision; parole is supervised release from prison where the DOC retains custody and the Board sets conditions. The Court treated that distinction as critical to whether certain “elapsed time” arguments could succeed.
  • Elapsed time credit: A discretionary/technical credit concept sometimes applied to certain supervision or placement periods depending on legal posture and court findings. Here, the Court rejected using placement time as elapsed-time credit where Short was a parolee and the sentencing court declined to award it.

Conclusion

L. Short v. Salmonsen establishes (and forcefully applies) a practical rule for Montana sentencing-credit disputes: time served in prison is service of the sentence, not “credit for time served,” and it cannot be counted twice—even under concurrency/merger theories. The Court also underscored that DOC calculations must track the final written judgments and that parole status can foreclose attempts to convert placement time into elapsed-time credit. The decision will likely narrow habeas challenges premised on aggregated credit arithmetic and sharpen the doctrinal line between presentence jail credit and post-sentence incarceration.