Good Conduct Time

By Elizabeth Franklin-Best, Esq., and Christopher Zoukis, JD, MBA

What is good conduct time?

Good conduct time is a credit of up to 54 days for each year of the sentence the judge imposed, awarded by the Bureau of Prisons for satisfactory institutional conduct under 18 U.S.C. § 3624(b). It applies to sentences of more than one year other than life, and a person who earns all of it serves roughly 85 percent of the sentence.

Key takeaways on good conduct time

• The statute allows “up to 54 days for each year of the prisoner’s sentence imposed by the court.” Before the First Step Act, the Bureau computed against time served, which the Supreme Court upheld in Barber v. Thomas, 560 U.S. 474 (2010), and which produced about 47 days per year instead.
• On a ten-year sentence, the change is worth 70 days: 470 days of credit under the old method, 540 under the new one.
• The 54-day figure is not universal. 28 C.F.R. § 523.20(d)(2) reduces it to up to 42 days a year for a person who has not earned and is not making satisfactory progress toward a high school diploma or equivalent.
• Good conduct time applies only to a term of imprisonment of more than one year, and not to a life sentence.
• Only a Discipline Hearing Officer can take it. A Unit Discipline Committee is expressly barred from doing so by 28 C.F.R. § 541.7(f).
• Good conduct time and first step act time credits are separate systems that stack. A person disqualified from time credits still earns good conduct time.

What the statute actually says

Here is the operative language of 18 U.S.C. § 3624(b)(1), quoted rather than paraphrased, because every misunderstanding on this subject starts with a paraphrase:

“Subject to paragraph (2), a prisoner who is serving a term of imprisonment of more than 1 year other than a term of imprisonment for the duration of the prisoner’s life, may receive credit toward the service of the prisoner’s sentence of up to 54 days for each year of the prisoner’s sentence imposed by the court, subject to determination by the Bureau of Prisons that, during that year, the prisoner has displayed exemplary compliance with institutional disciplinary regulations.”

Six things are doing work in that sentence.

“More than 1 year.” A twelve-month sentence earns nothing. A twelve-month-and-one-day sentence earns credit on the whole term. That single day is the reason “a year and a day” is a familiar phrase in federal sentencing, and it is a real consideration for any federal sentence mitigation attorney advising on a short sentence.

“Other than… life.” Life sentences are excluded outright.

“May receive.” Permissive, not mandatory — the award is conditioned on the Bureau’s determination about conduct.

“Up to 54 days.” A ceiling, not a floor. The same paragraph provides that where the Bureau determines the prisoner “has not satisfactorily complied with such institutional regulations, the prisoner shall receive no such credit toward service of the prisoner’s sentence or shall receive such lesser credit as the Bureau determines to be appropriate.”

“For each year of the prisoner’s sentence imposed by the court.” This is the First Step Act’s fix, and the whole of the next section.

“Exemplary compliance with institutional disciplinary regulations.” In practice this is not a high bar — the credit is presumptively awarded and taken away by sanction — but the statutory language is worth knowing, because it is the standard the Bureau is applying.

The same paragraph adds an education provision: “In awarding credit under this section, the Bureau shall consider whether the prisoner, during the relevant period, has earned, or is making satisfactory progress toward earning, a high school diploma or an equivalent degree.” That sentence is the statutory root of the 42-day rule discussed below.

And two structural rules close the paragraph. “Credit that has not been earned may not later be granted” — the Bureau cannot retroactively award credit for a year in which it was withheld. And “credit for the last year of a term of imprisonment shall be credited on the first day of the last year of the term of imprisonment.”

Paragraph (2) adds the vesting rule: “Notwithstanding any other law, credit awarded under this subsection after the date of enactment of the Prison Litigation Reform Act shall vest on the date the prisoner is released from custody.”

The First Step Act changed the arithmetic, and the change is worth 70 days on a ten-year sentence

This is the central fact on this page, and it is the one the search results get wrong most often.

Before December 2018, the Bureau of Prisons awarded good conduct time at the end of each year actually served. A prisoner earning the maximum thus received 54 days at the end of each completed year of confinement — but because the credit shortened the confinement, there were fewer completed years to earn against than there were years in the sentence.

Prisoners challenged that method and lost. In Barber v. Thomas, 560 U.S. 474 (2010), the Supreme Court held that “the Bureau’s method reflects the most natural reading of the statute,” and worked the arithmetic in the opinion itself:

“In sum, a prisoner subject to a 10-year (3,650-day) sentence who earns the maximum number of days the statute permits will serve 3,180 days in confinement and receive 470 days of ‘good time’ credit, about 15% of the prison time actually served.”

The petitioners had argued that the statute “permits a maximum good time award of 540 days (10 years times 54 days), not the 470 days that the method described above would allow.” They lost that argument in 2010. In 2018, Congress adopted it.

Section 102 of the First Step Act amended § 3624(b) to read “for each year of the prisoner’s sentence imposed by the court.” The Bureau’s own First Step Act overview states the result on exactly the hypothetical Barber used: “this change means that an offender sentenced to 10 years in prison and who earns the maximum good time credits each year will earn 540 days of credit.”

Good conduct time before and after the First Step Act — the same ten-year sentence

	Before the First Step Act	After the First Step Act
Statutory language	“up to 54 days at the end of each year of the prisoner’s term of imprisonment”	“up to 54 days for each year of the prisoner’s sentence imposed by the court” — 18 U.S.C. § 3624(b)(1)
What BOP computed against	Time actually served	The sentence the judge imposed
Upheld or changed by	Upheld — Barber v. Thomas, 560 U.S. 474 (2010)	Changed by Congress — First Step Act of 2018 § 102
Maximum credit, 10-year (3,650-day) sentence	470 days (Barber, 560 U.S. at 479)	540 days (BOP)
Days served on that sentence	3,180 days	3,110 days
Effective rate per year of sentence imposed	≈ 47 days	54 days
Percentage of the imposed sentence served	≈ 87.1%	≈ 85.2%
Difference	—	70 days, or about 2.3 months
When the change took effect	—	19 July 2019, the date DOJ published the risk and needs assessment system (BOP FAQ)
Retroactive?	—	Yes, to offenses committed before enactment, subject to the 1 November 1987 (federal) and 5 August 2000 (D.C. Code) dates (BOP FAQ)

The 3,110-day and percentage figures are arithmetic on the sourced credit totals; the credit totals themselves are from the Supreme Court and from BOP.

The retroactivity point matters and is easy to miss. The change was not limited to people sentenced after December 2018. BOP’s FAQ: “the changes to the calculation of good conduct time are retroactive, which means they apply to inmates who committed their crime prior to the enactment of the FSA on December 21, 2018.” Thousands of recomputations followed in July 2019.

Is this the “85 percent rule”?

Not by name, but the concept behind the phrase is real, and the honest version is more useful than the slogan.

Federal parole was abolished for offenses committed on or after 1 November 1987. What replaced it is a system in which the sentence pronounced is close to the sentence served, with good conduct time as the only broadly available reduction from the term itself. That is where “85 percent” comes from.

The arithmetic: 54 days of credit against a 365-day year leaves 311 days to serve, which is 85.2 percent of the year. Repeat that across a sentence and the whole-sentence figure lands in the same place. On the ten-year example above, 3,110 days served out of 3,650 imposed is 85.2 percent.

Two qualifications that pages repeating “85 percent” tend to omit:

It is 85 percent only if you earn all of it. Any disciplinary disallowance moves the number up. So does the literacy provision — a person capped at 42 days a year serves about 88.5 percent of each year rather than 85.2.

Eighty-five percent of the sentence is not eighty-five percent of the time in a prison. The last stretch of a federal sentence is frequently served in the community — in a residential reentry center or on federal home confinement — and, for those who qualify, first step act time credits can move both that placement and the transfer to supervised release earlier still. Good conduct time sets the release date. It does not set the date someone comes home. The community portion has its own ceilings: up to 12 months in a halfway house under 18 U.S.C. § 3624(c)(1), and 180 days or 10 percent of the sentence, whichever is shorter, on home confinement under § 3624(c)(2) — both extendable where First Step Act credits apply, under § 3624(g).

The method, worked on a hypothetical

This is arithmetic, not a prediction, and it is not a substitute for the Bureau’s computation. What follows shows the method so you can follow the Bureau’s own work on the sentence computation sheet.

Take a 60-month sentence with no disciplinary history and a high school diploma on file.

Step one — is there eligibility at all? Sixty months is more than one year and is not life, so § 3624(b)(1) applies.

Step two — how many years of sentence imposed? Five full years.

Step three — the annual rate. With a high school credential, up to 54 days a year under 28 C.F.R. § 523.20(d)(2)(i). Without one, and without satisfactory progress toward one, up to 42.

Step four — the total. Five years × 54 = 270 days of projected good conduct time. At the 42-day rate it would be 210 days — a 60-day difference on a five-year sentence.

Step five — the partial year, if there is one. Sentences rarely land on a round number of years. 28 C.F.R. § 523.20(b)(2) provides that “[t]he Bureau will award prorated credit for any partial final year of the sentence imposed,” and that “BOP calculates the projected GCT credit to be awarded for any portion of a sentence that is less than a full year at a prorated amount.” On a 66-month sentence, the extra six months generates roughly half a year’s worth of credit.

Step six — what it is subtracted from. The credit comes off the term. It does not come off the time already credited under 18 U.S.C. § 3585(b) for prior custody, which is a separate computation applied separately. Anyone whose numbers do not reconcile should look there next; the bop sentence computation page covers it.

Step seven — everything else is layered on top. Good conduct time sets a projected release date. From that date, rdap eligibility may support a further reduction of up to a year under 18 U.S.C. § 3621(e), First Step Act credits may move the transfer to supervised release up to twelve months earlier, and prerelease custody under the second chance act determines where the last stretch is served.

We are not going to run that sequence on your sentence. The Bureau does it, on a document you are entitled to see, and comparing the Bureau’s work against the method above is a far better use of your time than comparing it against an internet calculator.

Applied Insight — Christopher Zoukis, JD, MBA, Managing Director: Ask for the sentence computation sheet — the SENTRY sentence monitoring computation data printout — by name, and ask for it early. It shows the sentence imposed, the jail credit applied, the projected good conduct time, the statutory release date, and the projected release date on one page. Most families spend months arguing about a number without ever seeing the document the number comes from. When we look at a computation problem, that sheet is the first thing we want and it is usually the fastest thing to obtain.

Who earns good conduct time, and at what rate?

The eligibility thresholds

18 U.S.C. § 3624(b)(1) sets two: the term must be more than one year, and it must not be for the duration of the prisoner’s life.

Beyond that, the offense-date rules in 28 C.F.R. § 523.20 govern which version of the credit applies. Subsection (b) covers “inmates serving a sentence for offenses committed on or after November 1, 1987” — the Sentencing Reform Act population, which is nearly everyone in federal custody today. BOP’s FAQ confirms the coverage: only people convicted of federal offenses committed after 1 November 1987, and D.C. Code felony offenses committed on or after 5 August 2000, are eligible for up to 54 days.

People serving “old law” sentences — federal offenses before November 1987 — are under a different statutory regime with statutory and extra good time under the repealed provisions preserved at 28 C.F.R. Part 523, Subparts A and B. That population is now very small.

The 42-day literacy rule

This is the most consequential detail on the page that almost no competing page states.

28 C.F.R. § 523.20(d)(2), effective 14 March 2022, provides that for inmates serving a sentence for an offense committed on or after 26 April 1996, the Bureau will award:

“(i) Up to 54 days of GCT credit for each year of the sentence imposed, applied on the anniversary date of his or her imposed sentence, if the inmate has earned or is making satisfactory progress toward earning a high school diploma, equivalent degree, or Bureau-authorized alternative program credit; or (ii) Up to 42 days of GCT credit for each year of the sentence imposed, applied on the anniversary date of his/her imposed sentence, if the inmate does not meet conditions described in paragraph (d)(2)(i) of this section.”

Twelve days a year. Over a ten-year sentence that is 120 days — four months — turning on whether a person holds, or is progressing toward, a high school credential.

The word “or is making satisfactory progress toward” is doing important work. Enrollment and participation count; completion is not required to hold the 54-day rate. This is one of the few places in the federal system where signing up for something has an immediate, quantified effect on a release date, and it is the reason the Bureau’s literacy program is worth taking seriously from the first week.

There is a carve-out. § 523.20(d)(3): “a noncitizen (inmate who is not a citizen of the United States) who is subject to a final order of removal, deportation, or exclusion, is not required to participate in a literacy program to earn yearly awards of GCT credit.”

When the credit is applied, and when it vests

Timing matters more than people expect, because it determines what a sanction can reach.

Under 28 C.F.R. § 523.20(d)(2), the annual award is “applied on the anniversary date of his or her imposed sentence.” Not the calendar year, not the fiscal year — the anniversary of the sentence.

The final year has its own rule. Section 523.20 provides that “[c]redit for the last year of a term of imprisonment is awarded the day after the end of the final ‘anniversary period,’ unless the final year is a complete year, in which case credit for the last year is awarded on the first day of the final anniversary period,” and that “[w]hen the inmate reaches the Bureau-projected release date, the sentence will be satisfied and the inmate will be eligible for release.”

Vesting depends on the offense date, and § 523.20 sets it out in tiers:

Offense date	Vesting rule	Source
On or after 1 Nov. 1987, before 13 Sept. 1994	“GCT credit is vested once received and cannot be withdrawn”	28 C.F.R. § 523.20(c)
On or after 13 Sept. 1994, before 26 Apr. 1996	Vests annually, but only for inmates who have earned or are making satisfactory progress toward a high school diploma or equivalent	28 C.F.R. § 523.20(d)(1)
On or after 26 Apr. 1996	Awarded at 54 or 42 days per year depending on the literacy condition; vests on release under the PLRA rule at 18 U.S.C. § 3624(b)(2)	28 C.F.R. § 523.20(d)(2)

For the modern population, the practical meaning of the PLRA vesting rule is blunt: credit “shall vest on the date the prisoner is released from custody.” Until release, awarded credit remains exposed to disciplinary forfeiture.

How good conduct time is lost

Good conduct time comes off through the inmate discipline system at 28 C.F.R. Part 541, and only through it. Understanding that process is the difference between losing 41 days and keeping them.

The process, step by step

The incident report. A staff member writes it, and a staff investigation follows.

The Unit Discipline Committee. Under 28 C.F.R. § 541.7(c), “[t]he UDC will ordinarily review the incident report within five work days after it is issued, not counting the day it was issued, weekends, and holidays,” and review “may also be suspended if it is being investigated for possible criminal prosecution.” The UDC “ordinarily consists of two or more staff,” none of whom may be “victims, witnesses, investigators, or otherwise significantly involved in the incident.”

The referral. The UDC either finds the act committed, finds it not committed, or refers the matter onward. Referral is automatic in the serious cases: “[i]f you are charged with a Greatest or High severity prohibited act, or are an inmate covered by § 541.4, the UDC will automatically refer the incident report to the DHO for further review.”

The limit on UDC power. This is the sentence to know. Section 541.7(f): “If you committed a prohibited act or prohibited acts, the UDC can impose any of the available sanctions in Tables 1 and 2 of § 541.3, except loss of good conduct time credit, FSA Time Credits, disciplinary segregation, or monetary fines.”

A Unit Discipline Committee cannot take good conduct time. If good time was disallowed and the paperwork shows the UDC did it, that is not a judgment call — it is a defect on the face of the regulation.

The DHO hearing. Under 28 C.F.R. § 541.8, the Discipline Hearing Officer “will only conduct a hearing on the incident report if referred by the UDC.” The rights attaching to that hearing are specific:

• Notice. “You will receive written notice of the charge(s) against you at least 24 hours before the DHO’s hearing. You may waive this requirement.”
• A staff representative. You may request one of your choice, so long as they were not “a victim, witness, investigator, or otherwise significantly involved in the incident.” If your requests cannot be met and you still want one, “the Warden will appoint one.” The Warden will also appoint one “if it appears you are unable to adequately represent yourself before the DHO, for example, if you are illiterate or have difficulty understanding the charges.” Before the hearing the representative helps you understand the charge and its consequences, and “may also assist you by speaking with and scheduling witnesses, obtaining written statements, and otherwise helping you prepare evidence.”
• Appearance. In person or electronically, at the DHO’s discretion, and waivable.
• Statement and documentary evidence. “You are entitled to make a statement and present documentary evidence to the DHO on your own behalf.”
• Witnesses. The DHO “will call witnesses who have information directly relevant to the charge(s) and who are reasonably available,” and you may request witnesses on your behalf. They may be excluded if “not reasonably available,” if their presence “would jeopardize institution security,” or if they “would present repetitive evidence.”
• A written decision. The report must document whether you were advised of your rights, “[t]he evidence relied on by the DHO,” the decision, the sanction, and “[t]he reason(s) for the sanction(s) imposed.”
• Appeal. “You may appeal the DHO’s action(s) through the Administrative Remedy Program, 28 CFR part 542, subpart B.”

Before the hearing: the incident report and the investigation

Two procedural protections sit ahead of the UDC, and both are worth knowing because both are checkable after the fact.

28 C.F.R. § 541.5(a): “The discipline process starts when staff witness or reasonably believe that you committed a prohibited act. A staff member will issue you an incident report describing the incident and the prohibited act(s) you are charged with committing. You will ordinarily receive the incident report within 24 hours of staff becoming aware of your involvement in the incident.”

Then an investigation, and the investigator has specific duties under § 541.5(b)(1). The investigator “will specifically inform you: (A) of the charge(s) against you; and (B) that you may remain silent at all stages of the discipline process, but that your silence may be used to draw an adverse inference against you at any stage of the process.”

And then the sentence that matters most: “Your silence alone, however, cannot be the basis for finding you committed the prohibited act(s).”

That is a real limit, and it is checkable. A DHO report that identifies no evidence beyond a refusal to answer has not met the Bureau’s own standard.

The investigation is also where evidence gets preserved or lost. Section 541.5(b)(2): “When the investigator asks for your statement, you may give an explanation of the incident, request any witnesses be interviewed, or request that other evidence be obtained and reviewed.” A camera recording that is overwritten because nobody asked for it at the investigation stage is not recoverable at the hearing.

One suspension rule: “the staff investigation of the incident report may be suspended before requesting your statement if it is being investigated for possible criminal prosecution.”

And there is an off-ramp. Section 541.5(b)(3): “The incident report may be informally resolved at any stage of the disciplinary process, except for prohibited acts in the Greatest and High severity levels, or as otherwise required by law or these regulations. If the incident report is informally resolved, it will be removed from your records.”

For a Moderate or Low severity charge, informal resolution does not merely avoid a sanction — it removes the report. That matters well beyond good conduct time, because incident reports score on three separate items of the pattern risk assessment and can cost first step act time credits as well. A Low severity report resolved informally in the first week is worth far more than the same report appealed successfully a year later.

The two standards of proof, and why the difference matters

Constitutionally, the floor is low. In Superintendent v. Hill, 472 U.S. 445 (1985), the Supreme Court held that “the requirements of due process are satisfied if some evidence supports the decision by the prison disciplinary board to revoke good time credits,” and that testing that standard “does not require examination of the entire record, independent assessment of the credibility of witnesses, or weighing of the evidence.”

But the Bureau’s own regulation says more. 28 C.F.R. § 541.8(f): “The DHO’s decision will be based on at least some facts and, if there is conflicting evidence, on the greater weight of the evidence.” The same language appears for the UDC at § 541.7(e).

That is a meaningfully better standard than Hill requires, and it is the Bureau’s own. Where the evidence genuinely conflicted — your account against a single officer’s, with no corroboration either way — and the written decision does not show the DHO weighing it, the argument is that the agency failed to follow its own regulation. That is a stronger and narrower claim than arguing the evidence was thin.

The constitutional protections from Wolff v. McDonnell, 418 U.S. 539 (1974), sit underneath all of this: advance written notice, “a written statement by the factfinders as to the evidence relied on and reasons” for the action, and a qualified right “to call witnesses and present documentary evidence in his defense when permitting him to do so will not be unduly hazardous to institutional safety or correctional goals.” Wolff did not require confrontation, cross-examination, or counsel, and later cases have not extended it to require them.

How much is lost

For most of the current population, disallowance is mandatory and scaled to severity. 28 C.F.R. § 541.4(a) identifies two groups for whom loss is a “mandatory disciplinary sanction”:

“(1) VCCLEA-violent inmates. The date of your U.S. Code offense was on or after September 13, 1994, but before April 26, 1996, and you committed a ‘crime of violence’ as defined by the Violent Crime Control and Law Enforcement Act of 1994 (VCCLEA); or (2) PLRA inmates and DC Code offenders. The date of your U.S. Code offense was on or after April 26, 1996… or the date of your District of Columbia (DC) Code offense was on or after August 5, 2000.”

The second group is nearly everyone sentenced in the last three decades.

Mandatory good conduct time loss by severity level

Severity level of the prohibited act	Minimum loss	If fewer than 54 days are available for the prorated period	Trigger
Greatest	At least 41 days	75% of available credit	Each act committed
High	At least 27 days	50% of available credit	Each act committed
Moderate	At least 14 days	25% of available credit	After two or more Moderate acts in the current year of credit availability
Low	At least 7 days	12.5% of available credit	After three or more Low acts in the current year of credit availability

Source: 28 C.F.R. § 541.4(b).

Three features of that table repay attention. The figures are minimums — “at least” — so a DHO can take more. Greatest and High severity acts trigger loss on a single act; Moderate and Low require repetition within the year of credit availability, which means the second Moderate offense in a year is far more expensive than the first. And the percentages apply where fewer than 54 days are available for the prorated period, which scales the loss down to the smaller amount of credit available rather than making an early-year incident proportionally more expensive.

Restoration

Lost good conduct time is not always gone. Restoration is available through the disciplinary process itself, on the Bureau’s own procedures, and is a matter of demonstrated conduct over time rather than argument about the original finding.

That is a different mechanism from the one that applies to First Step Act credits, which have their own restoration rule at 28 C.F.R. § 523.43(c) — restoration “on a case-by-case basis, after clear conduct… for two consecutive risk and needs assessments,” decided at the Warden level and reapplicable after six months if denied. The two systems run in parallel and a single incident report can hit both — see first step act time credits.

If a DHO finding is expunged on appeal, the consequences are wider than the credit itself. Bureau policy on RDAP early release, for instance, provides a specific path for reinstating a § 3621(e) date where an incident report “is later expunged by the DHO.” An expungement that never propagates through the systems it should touch is one of the more common and more fixable problems we see.

Good conduct time versus First Step Act time credits

These are two different credits, from two different statutes, with two different sets of rules. They are frequently conflated, including on pages that should know better. They stack.

Good conduct time and First Step Act time credits compared

	Good conduct time	First Step Act time credits
Statute	18 U.S.C. § 3624(b)	18 U.S.C. § 3632(d)(4)
Regulation	28 C.F.R. § 523.20	28 C.F.R. §§ 523.40–523.44
How it is earned	Near-automatically, for satisfactory conduct	Only by successful participation in Bureau-recommended programming
Rate	Up to 54 days per year of sentence imposed (42 without the literacy condition)	10 days per 30 days of participation, plus 5 more for minimum or low risk meeting the two-assessment condition
Who is excluded	Sentences of one year or less; life sentences; pre-Nov. 1987 offenses	Convictions under the provisions listed at § 3632(d)(4)(D), plus the prior-conviction bar in Bureau policy
Does PATTERN risk level matter?	No	Yes, for the extra five days and for applying credits at all
Does a detainer matter?	No	Does not stop earning; blocks application
What it changes	The projected release date	The date of transfer to prerelease custody, and up to 365 days of the transfer to supervised release
How it is lost	DHO sanction under 28 C.F.R. § 541.4, mandatory and scaled by severity	DHO sanction under 28 C.F.R. § 523.43; only credits already earned
Restoration	Available through the disciplinary process	Available after clear conduct across two consecutive assessments, at Warden level
If you are disqualified from the other	You still earn this — BOP FAQ	You do not earn this if disqualified

The last row is the one that matters most to families of people with disqualifying offenses. BOP’s FAQ states it without qualification: “all inmates convicted of a federal offense committed after November 1, 1987 are eligible to earn up to 54 days of good conduct time.” A First Step Act disqualification is not a total exclusion from sentence credit. It removes the smaller and more conditional of the two credits — and it has no effect at all on placement in a residential reentry center or on federal home confinement.

The sequencing when everything applies

Where a person qualifies for more than one reduction, the order of operations is set by policy and it is not arbitrary.

BOP’s First Step Act FAQ states the good conduct time / RDAP sequence: “an inmate’s projected release date will first be adjusted due to application of the Good Conduct Time changes. The BOP will review inmates participating in RDAP to determine the amount of sentence reduction that would be appropriate.”

PS 5410.01 CN-2 states the RDAP / time credit sequence: “The 3621(e) benefit will be applied first to the inmate’s sentence computation, followed by the application of FTCs, however, an inmate must have sufficient time remaining to serve to complete all required components of the RDAP program (i.e., 120-day community-based treatment).” Where there is not enough time for both, “the number of FTC days applied will be reduced to allow for, at a minimum, the 120-day community-based placement.”

So: good conduct time first, then the rdap eligibility reduction, then First Step Act credits — with the credits yielding where they would otherwise crowd out RDAP’s community treatment requirement.

Applied Insight — Elizabeth Franklin-Best, Esq., Principal Attorney: Good conduct time disputes reach federal court through 28 U.S.C. § 2241, filed in the district of confinement, and they get dismissed on exhaustion more often than they get decided on the merits. The Bureau’s administrative remedy deadlines are short — twenty calendar days for the BP-9 — and a DHO appeal starts at the Regional Director rather than the Warden. We have seen strong claims lost because the first filing went to the wrong level or arrived a week late. If the disallowance is significant, treat the twenty-day clock as the operative deadline in the case, not the eventual habeas petition.

How to check and challenge a good conduct time computation

Get the document

The sentence computation sheet is the starting point. It sets out the sentence imposed, prior custody credit under 18 U.S.C. § 3585(b), projected good conduct time, the statutory release date, and the projected release date. Everything on this page is a way of reading that sheet.

For First Step Act credits, the parallel document is the FSA Time Credit Assessment — the FTC worksheet — which Bureau policy requires be uploaded to the central file at each auto-calculation and provided at each program review.

What to check

• The sentence imposed. Multiple counts, concurrent and consecutive terms, and aggregated sentences are where computation errors concentrate. Compare the sheet against the Judgment and Commitment order.
• The rate. Fifty-four days a year, or forty-two? If forty-two, is the literacy record accurate — is there a diploma or GED on file, or documented enrollment?
• Prior custody credit. Time in official detention that “has not been credited against another sentence” belongs under § 3585(b). This is the single largest source of computation disputes.
• Disallowances. Every disallowed day should trace to a DHO decision, not a UDC one, with a written report.
• Expungements. If a finding was reversed on appeal, confirm the days came back.

Where to raise it

Through the BOP administrative remedy program at 28 C.F.R. Part 542. Ordinary issues begin with informal resolution and a BP-9 to the Warden within 20 calendar days of the event under § 542.14; a BP-10 to the Regional Director within 20 days of the Warden’s signed response, and a BP-11 to the General Counsel within 30 days of the Regional Director’s, under § 542.15. DHO appeals skip the Warden and begin at the Regional Director under § 542.14(d)(2).

If nobody answers, the regulation gives you an exit. Section 542.18: “If the inmate does not receive a response within the time allotted for reply, including extension, the inmate may consider the absence of a response to be a denial at that level.” The response times are 20 calendar days at the institution, 30 at the region, and 40 at Central Office, each extendable once — 20, 30, and 20 days respectively — with the extension confirmed to the inmate in writing.

That structure exists because the courts require exhaustion. In United States v. Wilson, 503 U.S. 329 (1992), the Supreme Court confirmed both that the Attorney General through the Bureau computes credit rather than the sentencing judge, and that “[f]ederal regulations have afforded prisoners administrative review of the computation of their credits, see 28 CFR §§ 542.10–542.16… and prisoners have been able to seek judicial review of these computations after exhausting their administrative remedies.”

Our bop sentence computation page walks the whole sequence, including what to do when the computation itself — rather than a disciplinary finding — is the problem.

What the release date actually produces

Good conduct time sets a date. It is worth knowing what the statute says happens on it, because families plan around a day and the day can move by two.

The release itself. 18 U.S.C. § 3624(a) provides that “[a] prisoner shall be released by the Bureau of Prisons on the date of the expiration of the prisoner’s term of imprisonment, less any time credited toward the service of the prisoner’s sentence as provided in subsection (b).” Good conduct time is that credit. The projected release date on the computation sheet is the arithmetic already done.

The weekend rule. The same subsection provides that “[i]f the date for a prisoner’s release falls on a Saturday, a Sunday, or a legal holiday at the place of confinement, the prisoner may be released by the Bureau on the last preceding weekday.” That is why a Sunday date often becomes a Friday date, and it is permissive — “may” — not mandatory. A family that has booked travel for the calendar date on the sheet should confirm the operative date with the unit team.

What the Bureau must provide. Section 3624(d) requires the Bureau to furnish, on release at the expiration of the term: “(1) suitable clothing; (2) an amount of money, not more than $500, determined by the Director to be consistent with the needs of the offender and the public interest, unless the Director determines that the financial position of the offender is such that no sum should be furnished; and (3) transportation to the place of the prisoner’s conviction, to the prisoner’s bona fide residence within the United States, or to such other place within the United States as may be authorized by the Director.” The $500 is a statutory ceiling on the gratuity, not an entitlement to that figure.

Where the person goes. Section 3624(e): “A prisoner whose sentence includes a term of supervised release after imprisonment shall be released by the Bureau of Prisons to the supervision of a probation officer.” Release from custody and the end of the sentence are not the same event, and the supervised release term that follows has its own rules and its own exit — see early termination of supervised release.

None of this changes the arithmetic. It changes what a family should expect on the day, which is a different kind of useful.

The education program behind the 42-day rule

The literacy condition in 28 C.F.R. § 523.20(d)(2) does not stand alone. It has a statutory partner that creates an obligation running the other way.

18 U.S.C. § 3624(b)(3) provides: “The Attorney General shall ensure that the Bureau of Prisons has in effect an optional General Educational Development program for inmates who have not earned a high school diploma or its equivalent.”

Read the two provisions together and the structure is clear. Congress conditioned part of the credit on educational progress, and in the same breath required that the means of making that progress be available. The Bureau maintains the program through its Literacy Program — Program Statement 5356.01, dated 22 June 2026 on the Bureau’s current policy index, and agency policy rather than law.

The practical consequence: if a person is on the 42-day rate and there is no seat in the literacy program at their institution, that is a problem worth raising in writing rather than absorbing. The statute contemplates the program being in effect; twelve days a year turn on access to it. The same logic runs through the pattern risk assessment, where the education item scores −1 for enrollment in a GED program and −2 for holding the credential. Enrollment does work on two systems at once.

The Bureau’s First Step Act FAQ also confirms that mandatory programs now interact with the credit system: “Some mandatory programs, such as Drug Education and GED, now count as FSA programs. Refusing participation in mandatory programs results in consequences, such as pay limits, commissary limits, or ‘poor’ responsibility on custody classification. Inmates will not earn FTC if they refuse a mandatory program.”

So a refusal of the literacy program costs the 12 days a year on good conduct time, costs points on PATTERN, and stops first step act time credits accruing at all. It is one decision with three prices.

D.C. Code offenders

The Bureau houses people sentenced under the District of Columbia Code, and their good conduct time follows the federal rules with a date shift and one additional credit.

BOP’s First Step Act FAQ states the parity rule: “pursuant to DC Code § 24-403.01, inmates convicted of DC Code felony offenses committed on or after August 5, 2000 have good conduct time calculated in the same manner as federal inmates.” Those offenders are eligible for up to 54 days a year on the same terms, and 28 C.F.R. § 541.4(a)(2) places them in the same mandatory-disallowance group as PLRA inmates.

There is also a credit with no federal equivalent. The Bureau maintains a program statement titled Educational Good Time Sentence Credit for D.C. Code Offenders, PS 5885.01, dated 7 May 2026 on the current policy index — a fresh reissue, and agency policy rather than law. Anyone serving a D.C. Code sentence should ask the unit team whether that credit has been assessed, because it is separate from the § 3624(b) award and separately capable of going unclaimed.

The contrast with First Step Act credits is stark and worth stating plainly. D.C. Code offenders receive good conduct time on the same footing as federal offenders, but 28 C.F.R. § 523.44(a)(3) and Bureau policy provide that they can neither earn nor apply First Step Act time credits “unless and until the DC Council defines eligibility.” For that population, good conduct time is not merely the larger credit — for the moment it is the only one.

Working with a federal prison early release lawyer

Most good conduct time work is quiet: reading a computation sheet against a judgment, checking a disallowance against the regulation that authorized it, confirming that an expungement propagated. It is worth doing carefully because the stakes are measured in months, and because the same record drives first step act time credits and the pattern risk assessment.

The problems that recur:

An aggregated sentence computed wrong. Multiple judgments, or a federal sentence running alongside a state term, produce the hardest computations in the system and the highest error rate.

Prior custody credit that was never applied. Time in a county facility on a federal detainer, time in state custody that the state did not credit — both belong under § 3585(b), and both get missed.

Good time taken by the wrong body or on the wrong record. A UDC that disallowed credit it had no authority to touch. A DHO report that does not identify the evidence relied on. A conflicting-evidence case decided without any weighing.

A 42-day rate applied to someone who holds a diploma. More common than it sounds, and worth 12 days a year until corrected.

Elizabeth Franklin-Best, P.C. is a boutique federal criminal defense and appellate firm founded in 2019, with offices in Columbia and Mount Pleasant, South Carolina, serving clients nationwide on an intentionally small caseload. Elizabeth Franklin-Best has more than 20 years of federal and appellate criminal defense experience, is admitted to the U.S. Supreme Court and twelve of the thirteen U.S. Courts of Appeals, and has handled more than 330 federal proceedings. Christopher Zoukis, JD, MBA, leads the firm’s federal prison consulting work.

We do not promise outcomes. We do read the documents.

Schedule a consultation

If a projected release date does not match the arithmetic, or good conduct time was disallowed in a proceeding that did not follow the regulation, we can review the computation and the disciplinary record.

Schedule a consultation with Elizabeth Franklin-Best, P.C. Our practice is nationwide, in every federal district.

For how the credits fit together with the placements and the court-based routes, start at our federal prison early release lawyer hub. For the credit that runs alongside this one, see first step act time credits and the pattern risk assessment that gates it. For what happens after release, see early termination of supervised release.

Frequently Asked Questions About Good Conduct Time

Reviewed for legal accuracy by Elizabeth Franklin-Best, Esq., Principal Attorney·September 2026