Jail credit: how time served before sentencing counts
Under 18 U.S.C. § 3585(b), a defendant receives credit for every day spent in official detention before the sentence commenced, as long as that time has not been credited against another sentence. BOP — not the judge — applies the credit (United States v. Wilson), which is why the Judgment often says nothing about it and the credit only appears on the BOP computation. Missing jail credit is one of the most common computation errors, especially after time in state custody, on a federal writ, or in multiple pretrial facilities.
Reviewed against 18 U.S.C. § 3585(b) and BOP Program Statement 5880.28. Last updated .
What time qualifies for credit?
- Official detention — jail, detention center, or prison custody. Time on pretrial release with conditions (home detention, ankle monitor, halfway-house residence as a release condition) generally does not count (Reno v. Koray, 515 U.S. 50 (1995)).
- As a result of the offense — custody for the offense of conviction, or for any other charge for which the person was arrested after committing the offense.
- Not already credited — the same days cannot count against both a state sentence and the federal sentence. This double-credit bar drives most disputes.
How do I check whether the credit was applied?
The Sentence Monitoring Computation Data printout shows a Jail Credit line with the exact date ranges BOP counted — how to read the sheet. Compare those ranges against the actual custody history (arrest date, bond status, transfers). If days are missing, the case manager can submit a correction to the DSCC; if that stalls, the administrative remedy process creates the paper trail a later habeas petition needs.
The OutDate calculator accepts jail-credit day ranges directly, so you can see what the release date should be with the credit applied and compare it against what BOP shows.
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The free OutDate calculator applies these rules to a real sentence — Good Conduct Time, First Step Act credits, halfway house and RDAP dates — with every assumption listed next to the answer. No account needed; nothing is stored.
Open the federal release date calculatorFrequently asked questions
Does time on an ankle monitor before sentencing count?
Generally no. Under Reno v. Koray, conditions of pretrial release — including home confinement with electronic monitoring — are not 'official detention' under § 3585(b). Only custodial detention counts.
Can the judge order extra jail credit?
Not through § 3585(b) — that computation belongs to BOP. A judge who wants to account for non-creditable custody can instead adjust the sentence itself downward under U.S.S.G. § 5G1.3 at sentencing, which is a conversation for the defense attorney before the Judgment enters, not after.
My loved one sat in county jail for 14 months before sentencing. Does that come off?
If it was custodial detention for the federal offense (or an arrest after the offense) and wasn't credited to another sentence, yes — all of it, applied by BOP when the computation is built. Verify the Jail Credit line on the computation sheet matches the real dates.
Primary sources
Everything on this page is drawn from the statutes, regulations, and BOP program statements below — read them directly:
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Estimates, not promises
This page describes federal law and Bureau of Prisons policy in general terms for education. It is not legal advice, it doesn't account for the facts of any individual case, and no attorney–client relationship is created by reading it. The BOP makes all final release-date determinations. Have an attorney review anything before you file it. Built by OutDate, the federal release date calculator.