TIME & CREDITS — GOOD CONDUCT TIME

Good Conduct Time: The 54 Days a Year, Done Right

Good conduct time is the oldest and broadest sentence reduction in the federal system — up to 54 days for every year of the sentence imposed, available to nearly everyone. The First Step Act fixed a decades-old calculation shortfall, but errors still happen, and disciplinary sanctions can claw days back. Here is the full picture.

LAST REVIEWED: July 5, 2026 · FEDERAL SYSTEM ONLY · EDUCATIONAL — NOT LEGAL ADVICE

TIME LEDGER — CASE FILE SUMMARY CHECK THE 54

Days at stake	54 days per year of the sentence imposed — about 15% of the sentence
Legal authority	18 U.S.C. §3624(b), as amended by the First Step Act of 2018
Who gets it	Nearly all federal prisoners serving more than one year, including people excluded from FSA credits
How it is lost	Disciplinary sanctions after a due-process hearing — see DHO hearings
Common errors	Pre-FSA-style computation remnants, unposted restoration, sanction math errors
Fix path	Unit team → BP-8–BP-11 → §2241 habeas petition

What good conduct time is

Good conduct time — GCT, or simply good time — is the statutory reduction under 18 U.S.C. §3624(b) that a federal prisoner serving more than one year receives for compliance with institutional rules. It exists to make sentences shorter for people who follow the rules and to give institutions a management tool. Unlike parole, which the federal system abolished for offenses after 1987, GCT is not discretionary release; it is a computed reduction baked into the projected release date from day one.

The projected release date you see on the BOP locator already assumes full GCT will be earned. That design has a consequence families should internalize: GCT is not a bonus that appears later. It is a balance the person effectively holds and can lose. Protecting it is as valuable as earning anything new.

The 54-day fix in the First Step Act

For decades the BOP computed good time in a way that yielded roughly 47 days per year rather than the 54 the public — and many judges — assumed the statute provided, because the agency calculated against time actually served rather than the sentence imposed. The First Step Act ended the argument in 2018 by amending §3624(b) to award up to 54 days for each year of the sentence imposed, and the fix applied to people already serving sentences.

The practical arithmetic: a 10-year sentence carries up to 540 days of GCT — roughly 18 months — so a person with clear conduct serves about 85% of the term before FSA credits are even considered. On long sentences the seven-day-per-year difference the FSA fix delivered added weeks or months, and in the transition period some computations were corrected late or imperfectly. Old sentences deserve a fresh look at this layer.

GCT versus FSA credits: two different machines

Families constantly merge good conduct time and First Step Act time credits into one mental bucket, and the merger causes real mistakes. GCT rewards the absence of misconduct; FSA credits reward the presence of programming. GCT applies to nearly everyone; FSA earning excludes a long statutory list of offenses. GCT is capped only by the 54-per-year rate; FSA application toward early release caps at 365 days with the surplus flowing to prerelease custody.

They also fail differently. GCT errors tend to be computation remnants or sanction math; FSA errors tend to be eligibility coding and application failures. And they stack: a person excluded from FSA still earns full GCT, and a person earning both is reducing the sentence on two independent tracks. When auditing a release date, check each machine separately before concluding anything.

How good conduct time is lost

GCT is taken through the disciplinary system, and only through it. An incident report leads to a Unit Discipline Committee review and, for serious charges, a Discipline Hearing Officer hearing with defined due-process rights: advance written notice, a staff representative if requested, the chance to present evidence, and a written decision. Sanction schedules tie GCT loss to offense severity, with the most serious categories carrying mandatory forfeitures measured in weeks per incident.

Two protections matter here. First, GCT cannot lawfully vanish without that process — a balance that drops with no disciplinary finding is a computation error to challenge, not a mystery to accept. Second, some forfeited time can be restored after a clean period, and restoration does not always post automatically. Our DHO hearings guide covers the hearing, the sanctions, and the appeal, which for DHO decisions goes straight to the regional office.

Verifying the GCT layer of a computation

Pull the Sentence Monitoring Computation Data and find the good conduct time entries. The check is nearly pure arithmetic: years of the sentence imposed multiplied by 54, prorated for any partial final year, minus documented disciplinary forfeitures, plus any restorations. Compare the result to the projected GCT on the computation. On a clean-conduct record, the two numbers should match to the day.

Where they diverge, identify which side is wrong before writing anything. A shortfall with no disciplinary history points at computation error; a shortfall matching an old sanction points at restoration worth pursuing; an overage usually means you prorated the final year differently than the BOP does. Then put the specific numbers in a written question to the case manager, and escalate through the remedy program if the answer does not add up.

Special situations that bend the math

Sentences of a year and a day exist precisely because §3624(b) grants GCT only to terms over one year — that one extra day unlocks roughly seven weeks of good time, which is why judges impose it. Consecutive sentences are aggregated into a single computation, so GCT runs against the combined term. Time in disciplinary segregation does not itself forfeit GCT, though the underlying incident might. And GCT vests under the statute’s scheme, but a person’s projected date always reflects the current balance after sanctions.

People with detainers and non-citizens facing removal still earn GCT — unlike FSA application, GCT is not frozen by immigration status, though it cannot make a sentence end before related detainer consequences begin. See our detainers guide for how holds interact with each kind of credit.

When the fight goes to court

A GCT dispute the administrative process will not fix is a classic §2241 habeas claim: it challenges the execution of the sentence, belongs in the district of confinement, names the warden, and rides on the documentary record — judgment, computation, disciplinary file. Courts have decided these disputes for decades and the law of the 54-day calculation is now settled in the statute itself, which narrows most modern cases to arithmetic and process.

Where the GCT loss came through a disciplinary hearing, the court challenge looks different: it asks whether the hearing met due-process minimums and whether some evidence supported the finding — a deferential but real standard. Either way, the person in custody files pro se for five dollars, and the record your family kept is the exhibit list. That is the whole design of this site: the paper, the process, and the patience are things families can supply themselves.

Frequently asked questions

How much good conduct time does a federal prisoner earn?

Up to 54 days for each year of the sentence imposed, prorated for a partial final year — roughly 15% of the sentence. The projected release date on the BOP locator already assumes the full amount will be earned.

Is good conduct time the same as First Step Act credits?

No. GCT under §3624(b) rewards clear conduct and applies to nearly everyone; FSA credits under §3632 reward programming and exclude many offenses. They are computed independently and both can reduce time — check each separately when auditing a date.

Can the BOP take good conduct time without a hearing?

No. Forfeiture is a disciplinary sanction requiring the incident-report process, with DHO-level due process for serious charges. A GCT balance that drops without a disciplinary finding is a computation error to challenge through the administrative remedy program.

Can lost good conduct time be restored?

Some forfeited GCT can be restored after a period of clear conduct under BOP procedures. Restoration is worth affirmatively requesting at program reviews — it does not reliably happen on its own, and unposted restoration is a recurring, fixable error.

Why did old-law prisoners hear about a 47-day versus 54-day dispute?

Before 2018 the BOP’s method yielded about 47 days per year because it computed against time served. The First Step Act amended the statute to award up to 54 days per year of the sentence imposed and applied the fix to existing sentences — older computations are worth re-verifying against the current rule.