Prison Good Time Credits: 54 Days, First Step Act, and RDAP

Federal prison good time credits can shorten a sentence in three distinct ways: up to 54 days per year of good conduct time, 10 to 15 days of First Step Act earned time credits for every 30 days of approved programming, and up to a full year off through the Residential Drug Abuse Program. Each pathway has its own eligibility rules, its own math, and its own ways the credits can disappear.

Who Qualifies for Good Conduct Time

Good conduct time is available only to people serving a federal sentence longer than one year. A sentence of exactly 12 months or less earns no credit at all. Life sentences are also excluded, because there is no projected release date to calculate against.¹

That threshold matters more than people realize. Defense attorneys sometimes negotiate a 365-day sentence to avoid conditions that attach to longer terms, but the tradeoff is losing good conduct time entirely. The difference between a 12-month sentence and a 13-month sentence can mean the 13-month sentence results in less time actually served.

How the 54 Days Per Year Is Calculated

Eligible inmates can earn up to 54 days of credit for each year of the sentence the judge imposed. Before the First Step Act of 2018, the Bureau of Prisons (BOP) calculated credits based on time actually served rather than the full sentence, producing fewer days off. The First Step Act fixed the calculation to the sentence imposed.² On a 10-year sentence, an inmate earning the maximum each year now accumulates 540 days of credit instead of roughly 470.

Credits apply on each anniversary of the sentence. When the remaining time is less than a full year, the BOP prorates the credit.³ The credits are not guaranteed. The BOP evaluates whether the inmate has displayed satisfactory behavior during that year and can withhold some or all of the credit for that period based on disciplinary infractions.

The Education Requirement

To earn the full 54 days per year, you must either have a high school diploma or GED already, or be making satisfactory progress toward one. Without that credential and without active enrollment, the maximum drops to 42 days per year.³ The 12-day annual difference compounds. On a 10-year term, that is 120 days of credit lost by not enrolling.

When Credits Actually Vest

For offenses committed on or after April 26, 1996, good conduct time does not vest until the actual date of release.¹ Credits are projected and applied to your release-date calculation each year, but they stay provisional until you walk out. A serious infraction late in a sentence can forfeit credits that looked locked in.

First Step Act Earned Time Credits

The First Step Act created a second category of credits sitting on top of good conduct time. These reward active participation in rehabilitation programs rather than just staying out of trouble. The baseline rate is 10 days of credit for every 30 days of successful participation in approved programs.⁴

Inmates classified as minimum or low risk who maintain that rating across two consecutive assessments earn an additional 5 days per 30-day period, for a total of 15 days.⁴ Risk levels come from a standardized tool called PATTERN (Prisoner Assessment Tool Targeting Estimated Risk and Needs), administered at regular intervals by BOP staff.

These credits work differently from good conduct time. They do not simply subtract days from the sentence. They move you into prerelease custody earlier, meaning a halfway house (Residential Reentry Center) or home confinement. For inmates who maintain minimum or low risk levels, credits can also trigger early transfer to supervised release, but that transfer cannot happen more than 12 months before supervised release would otherwise begin.⁵ That 12-month ceiling caps the practical value no matter how many credits accumulate.

Offenses That Block First Step Act Credits

A long list of federal offenses disqualifies inmates from earning First Step Act time credits. The categories include:⁴

Violence and homicide: murder, manslaughter (with limited exceptions), kidnapping, carjacking, assault with intent to commit murder, assault resulting in substantial bodily injury to a spouse or intimate partner, and domestic assault by a habitual offender.
Terrorism and espionage: offenses involving biological or chemical weapons, gathering defense information for a foreign government, and attacks on railroad carriers or mass transportation.
Sex offenses and exploitation: sexual abuse, sexual exploitation of children, failure to register as a sex offender, and related child pornography offenses.
Firearms: using, carrying, or possessing a firearm during a crime of violence or drug trafficking offense under 18 USC 924(c).
Other serious offenses: arson in federal jurisdiction, bank robbery resulting in death, human trafficking (with exceptions for victim-related provisions), destruction of aircraft, and certain high-level drug offenses.

Inmates with disqualifying offenses can still participate in programming, but the credits that lead to earlier prerelease placement are off the table.²

Noncitizens subject to a final order of removal cannot apply earned time credits toward prerelease custody or supervised release.⁴ Internal BOP policy issued in 2025 further restricted prerelease placements for noncitizens with active immigration detainers.

Up to a Year Off Through RDAP

The Residential Drug Abuse Program (RDAP) is one of the largest single sentence reductions in the federal system. Completion can shave up to a full year off a sentence.⁶ The program runs at least six months of intensive individual and group treatment in a residential setting separated from the general population, followed by institutional and community-based aftercare.

Eligibility is limited to people convicted of nonviolent offenses, and the BOP defines “nonviolent” more narrowly than many inmates expect. Any current offense involving carrying, possessing, or using a firearm or other dangerous weapon disqualifies you from the early release benefit, even if the underlying charge does not read as violent.⁷ A drug trafficking conviction paired with a firearm enhancement under 18 USC 924(c) will cost you the sentence reduction even after you finish every phase of treatment.

Even for eligible inmates, the actual reduction is at the BOP’s discretion. Shorter sentences often draw six or nine months rather than the full year. Verify eligibility with case management staff before counting on this reduction, because the categorical exclusions go beyond the statute’s plain language.

How Credits Move You Into Prerelease Custody

Federal law directs the BOP to place inmates in less restrictive conditions during the final portion of the sentence. Under the Second Chance Act provisions of 18 USC 3624(c), halfway house placement can run up to the final 12 months. Home confinement is capped at the shorter of 10 percent of the total sentence or six months.¹ On a three-year sentence that works out to roughly 3.6 months on home confinement. Available halfway house beds and local BOP office staffing heavily influence the actual placement.

First Step Act credits open a separate pathway. When accumulated credits equal the remaining time and the inmate meets the risk-level requirements, those credits can trigger halfway house or home confinement placement earlier than the 12-month Second Chance Act window would allow.⁵

How Credits Are Lost

The BOP’s disciplinary system uses a four-tier severity scale, and each level carries different consequences for credits.⁸

Greatest severity (killing, assaulting staff, escape, rioting): 27 to 41 days of good conduct time disallowed per incident, plus forfeiture of up to 41 days of First Step Act credits.
High severity (fighting with serious injury, possessing weapons or drugs, sexual assault): 14 to 27 days of good conduct time disallowed, plus forfeiture of up to 27 days of First Step Act credits.
Moderate severity (fighting without serious injury, possessing unauthorized items, tattooing): 1 to 14 days of good conduct time disallowed.
Low severity (minor disruptions, being unsanitary, malingering): good conduct time loss only applies to repeat offenders, with 1 to 7 days disallowed for a second violation and 1 to 14 days for a third violation of the same act within six months.

Disallowed Versus Forfeited

The BOP draws a distinction that matters for anyone trying to recover lost time. “Disallowed” means credit was never formally awarded for that year. “Forfeited” means credit already projected or credited gets taken away. Once good conduct time is forfeited, it cannot be restored.⁹ Disallowed credits likewise cannot be restored except by appealing the underlying disciplinary decision. Only the Disciplinary Hearing Officer (DHO) can impose either sanction, and neither can be suspended as part of a negotiated resolution.

Challenging a BOP Credit Decision

When the BOP makes a decision you believe is wrong, whether a disciplinary credit loss, a sentence computation error, or a program-based denial, the administrative remedy process is the required first step before any court can hear the dispute.

The three levels run as follows:¹⁰

Institution level (Form BP-9): 20 calendar days from the incident to attempt informal resolution and file a formal written request with the Warden.
Regional appeal (Form BP-10): 20 calendar days from the date the Warden signed the response.
Central Office appeal (Form BP-11): 30 calendar days to appeal to the General Counsel in Washington.

Appeals of DHO disciplinary decisions skip the Warden and go directly to the Regional Director as the first step.¹⁰ Each incident report must be appealed separately, with copies of all prior filings attached at each level. Missed deadlines and wrong forms are where most challenges die. Exhausting all three levels is generally required before a federal court will hear a habeas petition on sentence computation.

Credit for Time Served Before Sentencing

Pretrial jail time does not become good conduct time, but it does count toward the total sentence. Under 18 USC 3585(b), a defendant receives credit for time spent in official detention before sentencing if that time was related to the offense of conviction or to any charge that led to arrest after the offense was committed.¹¹ The time cannot have already been credited against another sentence. Pretrial detention credited on a state sentence cannot also apply to a federal sentence.

The BOP, not the sentencing judge, makes the final prior custody calculation. Errors in this computation are among the most common sentence disputes filed through the administrative remedy process, and they directly affect when good conduct time accrual begins and how the release date is projected.

State Prisons Follow Different Rules

Everything above applies to the federal system only. State prisons operate under their own laws, and the variation is wide. At least 42 states have some form of sentence credit system, with roughly 33 using traditional good time laws and 34 offering earned time credits tied to programming. Earning rates, eligible offenses, forfeiture rules, and the interaction with parole all differ by state. For a state sentence, the relevant state’s department of corrections or sentencing statutes will contain the rules that apply. The federal framework described here does not govern state sentences.

1
Office of the Law Revision Counsel. 18 USC 3624 – Release of a Prisoner
2
Federal Bureau of Prisons. First Step Act Overview
3
eCFR. 28 CFR 523.20 – Good Conduct Time
4
Office of the Law Revision Counsel. 18 USC 3632 – Development of Risk and Needs Assessment System
5
eCFR. 28 CFR Part 523 Subpart E – First Step Act Time Credits
6
Office of the Law Revision Counsel. 18 USC 3621 – Imprisonment of a Convicted Person
7
eCFR. 28 CFR Part 550 Subpart F – Drug Abuse Treatment Program
8
eCFR. 28 CFR 541.3 – Prohibited Acts and Available Sanctions
9
Federal Bureau of Prisons. Inmate Discipline Program – Program Statement 5270.09
10
eCFR. 28 CFR Part 542 – Administrative Remedy
11
Office of the Law Revision Counsel. 18 USC 3585 – Calculation of a Term of Imprisonment