Sentence Computation, Jail Credit and Earned Time

A release date is arithmetic. Start from the commencement date, add credit for qualifying time already served, subtract credit earned in custody, and account for how multiple terms interact. Every step depends on a document, and most errors are errors in a document rather than in the arithmetic.

When the sentence begins

Under 18 U.S.C. 3585(a), a sentence to a term of imprisonment commences on the date the person is received in custody awaiting transportation to, or arrives voluntarily to commence service at, the official detention facility at which the sentence is to be served.

That is not the date of sentencing. A person sentenced while at liberty and ordered to surrender begins the term on the surrender date. A person already in state custody who is produced for federal sentencing on a writ does not begin the federal term on that date, because the writ borrows the person without transferring custody. Getting this date wrong shifts everything downstream.

Credit for time already served

Section 3585(b) gives credit toward the term for time spent in official detention prior to the date the sentence commences, where the detention resulted from the offense for which the sentence was imposed, or from any other charge for which the person was arrested after the commission of the offense for which the sentence was imposed. The section then adds the controlling limitation: only where that time has not been credited against another sentence.

That limitation prevents double counting and is the source of most disputes. Time spent in state custody that a state court credited against a state sentence cannot also reduce the federal term, even where the person was held partly on a federal detainer. The way to test a claim is to obtain both computations and identify the days each one used.

Official detention means custody, not restriction. Reno v. Koray held that time spent released on bail subject to restrictive conditions, including confinement to a treatment facility, is not official detention for this purpose. That decision draws the practical line: a person subject to a condition is not in detention, however restrictive the condition.

Good conduct time and earned time

Good conduct time under 18 U.S.C. 3624(b) accrues at up to fifty-four days for each year of the sentence imposed, conditioned on compliance with institutional disciplinary regulations. The award for the final year or part-year is prorated. Disciplinary sanctions can disallow or forfeit credit, and the distinction between the two, along with the route to restoration, is set out under loss of good conduct credit and its restoration.

Federal Time Credits are a separate currency earned by completing recidivism reduction programming and productive activities. They are unavailable for a list of disqualifying offenses and are affected by the assessed risk level. Their principal effect is on placement in prerelease custody and on early transfer to supervised release, rather than on the raw term.

Prerelease custody is governed by 18 U.S.C. 3624(c), which directs that a person be afforded, to the extent practicable, a portion of the final part of the term under conditions that will prepare for reentry, including residential reentry center placement and home confinement, subject to statutory limits on duration.

Multiple terms and how they aggregate

Section 3584 supplies the rules. Multiple terms imposed at the same time run concurrently unless the court orders otherwise. A term imposed on a person already subject to an undischarged term runs consecutively unless the court orders otherwise. Multiple terms, whether concurrent or consecutive, are treated as a single aggregate term for administrative purposes.

Aggregation matters because good conduct time is computed on the aggregate. A judgment that is silent, ambiguous, or inconsistent between its oral pronouncement and its written form produces a computation dispute that the agency cannot resolve on its own; the answer is a motion to the sentencing court for clarification.

Correcting a computation

Errors are corrected administratively first. File through each level of the administrative remedy process, attaching the judgment, the computation sheet, and the records establishing the disputed period, and state the arithmetic rather than the grievance. The requirement to complete every level before filing suit, and the narrow circumstances in which a remedy is unavailable, are set out under grievance exhaustion before suit.

If the administrative levels do not correct it, the judicial vehicle is a habeas petition filed in the district of confinement, because a corrected computation would shorten the time in custody. A motion to the sentencing court is the wrong vehicle for a computation dispute, and a civil rights action is the wrong vehicle for anything that would shorten a term.

Time matters here more than in most areas. A miscomputation discovered near the projected release date leaves no room for administrative levels to run, so the computation sheet is worth checking early in the term rather than at the end. Where the term is followed by supervision, the release date also sets the start of the supervision term, and the conditions and revocation framework are described under parole and supervised release revocation. Placement decisions in the final portion of the term follow the classification framework in classification, custody levels and transfer.