TIME & CREDITS — TWO SYSTEMS

First Step Act Credits vs. Good Conduct Time

Two different federal time reductions run at the same time, on different rules, and families constantly collapse them into one. Good conduct time is nearly automatic and capped. First Step Act credits are earned through programming and, on the prerelease side, uncapped. Understanding how they differ — and how they stack — is the key to reading any release date correctly.

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

TIME LEDGER — CASE FILE SUMMARY THEY STACK

Good conduct time	54 days per year of sentence imposed, under 18 U.S.C. §3624(b)
FSA time credits	10–15 days per 30 days of programming, under §3632(d)(4)
How GCT is earned	Nearly automatic; lost only through discipline
How FSA credits are earned	Through participation in EBRR programs and productive activities
The caps	GCT is fixed by sentence length; FSA credits cap at 365 days to the date, uncapped to prerelease custody
Do they combine?	Yes — they are separate reductions that stack

The one-sentence difference

Good conduct time rewards following the rules; First Step Act credits reward doing the programming. Good conduct time is granted at a flat statutory rate for staying out of serious disciplinary trouble, and it is lost only when discipline takes it. First Step Act credits must be actively earned through participation in evidence-based recidivism reduction programs and productive activities, and they accrue month by month for people doing the work.

Because they run on different logic, they behave differently on the computation sheet, and a family reading a release date needs to see both. Our good conduct time guide and FSA flagship each go deep; this page is about how they relate.

How good conduct time works

Under 18 U.S.C. §3624(b), a person earns up to 54 days of good conduct time for each year of the sentence imposed. After years of litigation over how to calculate it, the First Step Act itself settled the method so that the full 54 days per year is credited — a fix that gave many people back roughly a week per year they had been denied under the old calculation.

Good conduct time is close to automatic: the BOP awards it unless it is taken through the disciplinary process. A disciplinary hearing resulting in a sanction can forfeit good conduct time, which is one reason clean conduct has direct sentence value. Good conduct time applies to nearly everyone, including many people who are excluded from earning FSA credits.

How First Step Act credits work

FSA credits accrue at 10 days for every 30 days of successful programming, rising to 15 days per 30 for people assessed at minimum or low PATTERN risk across two consecutive assessments. Unlike good conduct time, they must be earned through participation, and they are subject to the offense-based exclusion list. A person doing consistent programming builds credits steadily.

The application side is where FSA credits get their power. Up to 365 credits can move the release date itself earlier — an early transfer to supervised release. Beyond that ceiling, credits apply toward prerelease custody with no statutory cap, which is why long-sentence programmers can earn a year off plus many additional months in a halfway house or on home confinement.

How they stack on the computation

The two reductions do not compete; they combine. Good conduct time shortens the sentence on its own schedule, and FSA credits apply on top, first toward the release date and then toward prerelease custody. On a sentence-monitoring computation, a family should be able to identify the projected release date reflecting good conduct time, and then the FSA credits pushing the effective date and the prerelease-custody window earlier still.

This stacking is exactly where confusion breeds. A date that already reflects good conduct time may look wrong to a family expecting FSA credits to move it further, when in fact the FSA credits are shown separately or are being applied to prerelease custody rather than the release date itself. Our sentence computation guide shows where each figure appears.

Why families mix them up — and why it matters

The most common error is treating a good-conduct-time release date as the final answer and concluding that FSA credits "aren't working" because that date did not move. In reality the FSA credits may be correctly applied to prerelease custody, advancing the halfway house or home confinement date rather than the release date. Both are real reductions; they just land in different columns.

The reverse error also happens: assuming FSA credits will substitute for good conduct time, or double-counting the same days. They are distinct authorities. Reading them separately — good conduct time under §3624(b), FSA credits under §3632(d)(4) and §3624(g) — is the only way to know whether a computation is right.

Auditing both at once

A complete audit checks four things. Is good conduct time credited at the full 54 days per year, with no unexplained forfeitures? Is the person coded eligible for FSA credits, and earning at the right rate? Are FSA credits being applied — to the date up to the 365 ceiling, and to prerelease custody beyond it? And do the resulting figures show up in the projected release date and the conditional placement date?

Our free calculator estimates the FSA side independently, and the release-date guide shows where to find every number. When the math does not match, the miscalculation guide and remedy program are the tools to fix it.

Frequently asked questions

What's the difference between good conduct time and First Step Act credits?

Good conduct time is a near-automatic 54 days per year of the sentence imposed (18 U.S.C. §3624(b)), lost only through discipline. First Step Act credits are earned through programming at 10–15 days per 30 days (§3632(d)(4)) and are subject to an offense-based exclusion list. They are separate reductions that stack.

Do good conduct time and FSA credits stack?

Yes. They are distinct authorities that combine. Good conduct time shortens the sentence on its own schedule, and FSA credits apply on top — up to 365 days toward the release date and, beyond that, without cap toward prerelease custody like a halfway house or home confinement.

How many days of good conduct time can you earn?

Up to 54 days for each year of the sentence imposed. The First Step Act settled the calculation method so the full 54 days per year is credited, which restored roughly a week per year that many people had been denied under the older calculation.

Why didn't FSA credits move the release date?

Often because they were correctly applied to prerelease custody — advancing the halfway house or home confinement date — rather than to the release date itself, which caps at 365 credits. Both are real reductions; they just appear in different places on the computation. Check the conditional placement date, not only the release date.

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