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What Is RDAP, and How Is Its Early-Release Benefit Different from Time Credits and Good-Conduct Time?

A treatment program under part 550, and a separate statutory benefit under § 3621(e) — participation, completion and eligibility are three different questions.

In custody • Programming Last reviewed: September 6, 2026

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Short answer

The Residential Drug Abuse Treatment Program has components defined in 28 C.F.R. § 550.53, including a unit-based component of at least six months and Community Treatment Services. Separately, 18 U.S.C. § 3621(e)(2)(B) provides that the period of custody of a prisoner convicted of a nonviolent offense who successfully completes a treatment program may be reduced by not more than one year, with eligibility governed by 28 C.F.R. § 550.55. Participation, completion and eligibility for that benefit are three separate questions, and none of this is good-conduct time or a First Step Act Time Credit.

Attorney review pending. This is general education, not legal advice.

Plain-English overview

The direct answer: RDAP is a treatment program. The possible early-release benefit associated with it comes from a separate statute, 18 U.S.C. § 3621(e), and has its own eligibility rules in 28 C.F.R. § 550.55.

28 C.F.R. § 550.53 describes the program's components, including a unit-based component of at least six months in a treatment unit set apart from the general population, follow-up treatment, and Community Treatment Services when the person transfers to community confinement.

18 U.S.C. § 3621(e)(2)(B) provides that the period of custody of a prisoner who was convicted of a nonviolent offense and who successfully completes a treatment program may be reduced by the Bureau of Prisons, but the reduction may not be more than one year from the term the prisoner must otherwise serve. 'May' is the statute's word.

Participation, successful completion and eligibility for the § 3621(e) benefit are three separate questions. 28 C.F.R. § 550.55 sets out who is not eligible for early release, including categories tied to current or prior convictions. CaseSteps does not determine anyone's eligibility and does not predict any reduction.

Why this matters

RDAP, good-conduct time and First Step Act credits are three different things that people add together into one expected release date. They come from different statutes and are decided in different ways.

Three different reductions, three different sources

RDAP and 18 U.S.C. § 3621(e)

A possible reduction of the period of custody of not more than one year for an eligible person convicted of a nonviolent offense who successfully completes treatment. Program components are in 28 C.F.R. § 550.53; early-release eligibility is in § 550.55.

Good-conduct time

Up to 54 days for each year of the sentence imposed, under 18 U.S.C. § 3624(b), based on the Bureau's determination about compliance with institutional disciplinary regulations. Not tied to programming.

First Step Act Time Credits

Earned under 18 U.S.C. § 3632(d)(4) by eligible people for successfully completing assigned evidence-based recidivism reduction programming or productive activities, and applied under 28 C.F.R. § 523.44 toward prerelease custody or early transfer to supervised release.

Ten authorities people treat as one

Second Chance Act prerelease placement

18 U.S.C. § 3624(c)(1) permits a portion of the final months of imprisonment, not to exceed 12 months, in conditions that afford a reasonable opportunity to prepare for reentry. A ceiling on an authority, not an award.

First Step Act Time Credits

A separate credit under 18 U.S.C. § 3632(d)(4) earned by eligible people for successfully completing assigned qualifying programming, with its own earning, recording and application rules in 28 C.F.R. part 523, subpart E.

Residential Reentry Center (RRC) placement

Placement in a community correctional facility as described in 28 C.F.R. § 570.20(a). A Residential Reentry Center (RRC), often called a halfway house, is ordinarily a form of Bureau of Prisons prerelease custody.

Home confinement

Home detention as defined in 28 C.F.R. § 570.20(b), confinement to a residence except for authorized absences. Section 3624(c)(2) limits use of that subsection's authority to the shorter of 10 percent of the term or 6 months.

RDAP and 18 U.S.C. § 3621(e)

The residential drug abuse treatment program has components defined in 28 C.F.R. § 550.53. A separate provision, § 3621(e)(2)(B), permits a reduction of the period of custody of not more than one year for an eligible person who completes treatment.

Good-conduct time

Up to 54 days per year of the sentence imposed under 18 U.S.C. § 3624(b), based on the Bureau's determination about compliance with disciplinary regulations. Not a program credit.

Early transfer to supervised release using credits

18 U.S.C. § 3624(g)(3) permits transfer to begin a court-imposed supervised-release term at an earlier date, not to exceed 12 months, based on the application of time credits.

The court-imposed term of supervised release

A term imposed by the sentencing court under 18 U.S.C. § 3583 that, under § 3624(e), commences on the day the person is released from imprisonment. Overseen through the federal judiciary. Not parole.

Modification and early termination

Court decisions under 18 U.S.C. § 3583(e)(1) and (e)(2). Early termination becomes available after the expiration of one year of supervised release; it is not automatic at that point.

Revocation

A separate court decision under § 3583(e)(3), on a finding by a preponderance of the evidence, with the protections of Federal Rule of Criminal Procedure 32.1.

What the regulation says about early-release eligibility

  • 28 C.F.R. § 550.55(a) states who may be considered for early release: inmates who were sentenced to a term of imprisonment under the United States Code for a nonviolent offense, and who successfully complete RDAP, subject to the exclusions that follow.
  • Section 550.55(b) lists categories of inmates who are not eligible for early release, including, among others, inmates whose current offense is a felony that has as an element the actual, attempted or threatened use of physical force, or that involved carrying, possession or use of a firearm or other dangerous weapon or explosives, or that by its nature or conduct presented a serious potential risk of physical force, or that by its nature or conduct involved sexual abuse offenses committed upon children.
  • The regulation also addresses prior convictions for homicide, forcible rape, robbery, aggravated assault, arson, kidnapping and sexual abuse offenses committed upon children.
  • Whether any of these applies to a particular person is an individual determination the Bureau makes, and a legal question for counsel. CaseSteps does not make it and does not read anyone's record.
  • Successful completion of RDAP and eligibility for the § 3621(e) benefit are separate. A person can complete the program without the benefit applying.

Common misunderstandings

  • "RDAP takes a year off automatically." Section 3621(e)(2)(B) says the period of custody may be reduced, by not more than one year, for an eligible person who successfully completes treatment.
  • "RDAP credit is a First Step Act credit." They come from different statutes with different rules and different destinations.
  • "RDAP time is good-conduct time." Good-conduct time under § 3624(b) is about compliance with disciplinary regulations, not treatment.
  • "Finishing RDAP settles the halfway-house question." RRC placement and home confinement are decided under § 3624(c) and 28 C.F.R. part 570, separately.
  • "Someone can tell me whether I qualify." Eligibility is an individual determination. CaseSteps does not make eligibility determinations.

Dated rule change — checked September 6, 2026

Through September 29, 2026, the existing version of 28 C.F.R. § 523.42(a) remains the currently effective regulatory text. It ties the start of First Step Act Time Credit earning to the date the person arrives, or voluntarily surrenders, at the designated Bureau of Prisons facility.

Effective September 30, 2026, revised § 523.42(a) states: “An eligible inmate begins earning FSA Time Credits after the inmate’s term of imprisonment commences.” The amendment removes the language that tied commencement to arrival or voluntary surrender at the designated Bureau facility.

This does not mean credits begin automatically merely because a sentence was imposed. The person must still be eligible and must successfully complete assigned, approved evidence-based recidivism-reduction programming or productive activities. The change does not promise retroactive credits and does not establish any individual release, placement or transition date. Implementation guidance and practices may change. Check the current regulation and current Bureau of Prisons guidance.

The same rule revises 28 C.F.R. § 523.44(a)(3). It states that the paragraph does not bar application of First Step Act Time Credits for a person serving a sentence imposed in a foreign country when the U.S. Parole Commission has determined an equivalent U.S. Code sentence under 18 U.S.C. § 4106A.

The document is an interim final rule and request for comments, published August 31, 2026 at 91 FR 55740, effective September 30, 2026. Comments are accepted through September 30, 2026. The Bureau invoked the Administrative Procedure Act’s good-cause provisions rather than using prior notice and comment.

This page describes a regulation that changes on September 30, 2026. Confirm the current regulation and Bureau of Prisons guidance before relying on it.

Where credits are part of the answer on this page, that rule could change the answer. CaseSteps records the rule as dated and pending rather than describing how it will apply to anyone.

The interaction between a § 3621(e) reduction and the application of time credits is addressed in Bureau policy rather than on this page; ask appropriate staff and counsel about how policy handles a case involving both.

Records that may help clarify the issue

  • Any written record of an RDAP eligibility interview or placement decision.
  • The current sentence computation.
  • The First Step Act Time Credit assessment sheet, kept separate from RDAP records.
  • Do not upload any of these records to CaseSteps, and do not type case numbers, register numbers, dates or names anywhere on this site. Nothing here accepts files or keeps what you type.

Questions for the drug abuse program coordinator or unit team

  • What is the general process for being considered for RDAP at this institution?
  • In general terms, what is the difference between completing the program and being eligible for the § 3621(e) benefit?
  • Which record would show a decision about early-release eligibility?

Exactly where each statement above comes from — source checked: September 6, 2026

  • Program components, including the unit-based component of at least six months and Community Treatment Services: 28 C.F.R. § 550.53, current eCFR text, read September 6, 2026.
  • The possible reduction of the period of custody by not more than one year for an eligible person convicted of a nonviolent offense who successfully completes treatment: 18 U.S.C. § 3621(e)(2)(B), official U.S. Code text on GovInfo.
  • Early-release eligibility and the exclusion categories: 28 C.F.R. § 550.55(a) and (b).
  • Good-conduct time: 18 U.S.C. § 3624(b).
  • First Step Act Time Credits: 18 U.S.C. § 3632(d)(4) and 28 C.F.R. § 523.44.
  • The Bureau's public description of its substance abuse treatment programs: Bureau of Prisons Substance Abuse Treatment page.

What CaseSteps cannot do

CaseSteps does not calculate First Step Act Time Credits, good-conduct time, a release date, a placement length or any other figure.

CaseSteps does not decide eligibility, predict whether anyone will receive Residential Reentry Center placement, home confinement, an RDAP early-release benefit or early transfer to supervised release, and does not predict how a court will rule on modification, early termination or an alleged violation.

CaseSteps does not draft motions, administrative remedies or responses to alleged violations. Individual questions belong with qualified counsel, appropriate Bureau of Prisons staff and, once supervision begins, the supervising probation officer.

Questions to discuss with counsel

  • In general terms, what is the difference between completing RDAP and qualifying for the § 3621(e) benefit?
  • Are there aspects of my case counsel would expect the eligibility regulation to reach?
  • How is this different from good-conduct time and from First Step Act credits?
  • What records would counsel want to review about program placement?
  • What should I avoid assuming about timing?

Official sources

This is general federal legal education, not legal advice. Procedures and outcomes depend on the facts, the controlling law, court orders and local practices. Confirm deadlines and decisions with qualified counsel.

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