Published July 27, 2026 · Navigate Justice

The Federal Credit System: Good Time, FSA, and RDAP in 2026

When a federal judge announces a sentence, that number and the time actually spent in custody are rarely the same thing. Three separate credit systems (Good Conduct Time, First Step Act (FSA) earned time credits, and the Residential Drug Abuse Program (RDAP)) can each shorten time in a facility, and a fourth, prerelease community placement, can move the final stretch out of a facility entirely.

The math behind each of these credits is public and well documented. The law has stayed stable while practice has been anything but, especially on the community-placement side, where Bureau of Prisons (BOP) policy has changed direction more than once in the past year. Understanding the statutes gets you the ceiling. Understanding recent BOP practice gets you a realistic floor. Both matter.

Estimate your own range with the Navigate Justice Sentencing Calculator, which applies the 2024 U.S. Sentencing Guidelines and layers in good-time, FSA, and RDAP credits. It's a free educational tool, not a guarantee of any outcome.

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Good Conduct Time: the one credit that's actually simple

Under 18 U.S.C. § 3624(b), as amended by the First Step Act, federal inmates serving more than 12 months earn up to 54 days of Good Conduct Time (GCT) for every year of the sentence imposed, not the time actually served [1]. That works out to roughly 85% of the sentence [2]. GCT is calculated based on the imposed sentence but can be forfeited as a disciplinary sanction under 28 CFR Part 541, so it functions more like a bank account you can draw down than a reward paid at release [1][23].

Sentence	Good Conduct Time	Approx. time served
12 months	54 days	~10 months
24 months	108 days	~20 months
36 months	162 days	~31 months
60 months	270 days	~51 months
84 months	378 days	~72 months
120 months	540 days	~102 months
180 months	810 days	~153 months
240 months	1,080 days	~204 months

First Step Act credits: the rate depends on a risk score, not a countdown clock

FSA earned time credits (ETCs) aren't awarded on a fixed schedule tied to sentence length. They're tied to a person's score on PATTERN, the BOP's recidivism risk-assessment tool, which is reassessed periodically throughout the sentence [3].

Here's the actual mechanism: everyone eligible starts out banking 10 days of credit for each completed 30-day stretch of approved programming or work assignments. Holding a minimum or low PATTERN score across a later reassessment raises that rate to the full 15 days per 30 [3][4]. Medium- and high-risk scorers don't earn these credits at all under current policy, no matter how long their sentence runs [3]. There's a ceiling on how much of this can shorten an actual release date (365 days total), and anything a person earns past that point converts instead into extra prerelease time rather than disappearing [5].

RDAP: the biggest single credit, but not a flat number

RDAP is typically nine months in duration and runs inside a dedicated treatment unit [6]. Completing it can reduce a sentence by up to one year, as authorized under 18 U.S.C. § 3621(e) [8]. That "up to one year" figure scales with sentence length rather than applying flatly: the BOP's own eligibility framework lays out a tiered structure, where a 37-month-or-longer sentence is needed to reach the full 12-month cut, sentences of 31 to 36 months top out around 9 months, and anything shorter earns proportionally less [7].

To qualify at all, someone generally needs at least 24 months remaining on the sentence, a documented substance abuse or dependence pattern within the 12 months before arrest (usually established in the presentence report), and no disqualifying prior convictions for violent offenses [7]. For context on scale, the Government Accountability Office has reported that roughly 20% of the BOP's approximately 175,000 inmates carry a diagnosed substance use disorder [18].

Community placement: where the calculator meets the news cycle

This is the part of the calculation that's genuinely unstable right now, and it's the reason a static number from a calculator can be misleading if you don't also know what's happening in BOP policy.

By statute, the Second Chance Act of 2008 (codified at 18 U.S.C. § 3624(c)(1)) authorizes the BOP to move a prisoner into a Residential Reentry Center (a halfway house) for as long as a year before release, with some of that stretch potentially converted to home confinement [9]. That statutory ceiling has not been amended.

What has moved is how much of that year people are actually receiving. In March 2025, the BOP issued a memo cutting most halfway-house stays to 60 days (125 days for RDAP graduates), which yanked already-approved release dates out from under people mid-transition [10]. The backlash from families and advocacy groups was immediate, and inside two weeks the BOP walked the cap back [11]. Then in June 2025 the agency reversed course again, telling wardens that FSA and Second Chance Act authority "are cumulative and shall be applied in sequence to maximize prerelease custody," and that a shortage of halfway-house beds could no longer be used to deny someone home confinement they otherwise qualified for [12].

But the deeper problem may not be policy reversals at all. A Government Accountability Office review released in February 2026 found that the BOP does not actually know how many people currently in its custody are already eligible to transfer to a halfway house or home confinement, because eligibility dates aren't tracked in any central system [13][19]. The same review found the agency has been paying halfway houses late often enough to trigger more than $12 million in required interest penalties under the Prompt Payment Act [13][20]. "If by the time you get to the [residential reentry centers], you don't have enough time, then that could really affect your ability to successfully reenter," GAO's Gretta Goodwin told reporters [20].

Eligibility itself also carries less certainty than the credit balance alone suggests. Forbes reporting from April 2026 quoted Rick Stover, special assistant to BOP Director William Marshall, acknowledging that as credit-driven stays in halfway houses and home confinement lengthen, "we only have a finite number of contractual spaces to go around" [21]. Becoming eligible for prerelease custody is not the same as being entitled to it: the Second Chance Act leaves the BOP discretion over whether, when, and for how long to grant placement, weighing factors like bed space and public safety alongside the earned-credit total [21]. FAMM president Shaneva McReynolds has raised a related point about the BOP's cost rationale for limiting placements, noting that prisons carry "fixed costs that do not apply to halfway houses," meaning the savings argument for keeping people institutionalized longer is weaker than the BOP has suggested [14].

The practical takeaway: the one-year figure is a legal maximum, not a planning number, and even a fully earned credit balance doesn't guarantee it. Ask a unit team or attorney what a specific facility is actually doing right now, since both the policy and the agency's own tracking of eligibility have been unsteady over the past year.

Sentence reductions after sentencing: a narrower door than it sounds

Separately from these credit programs, 18 U.S.C. § 3582(c)(1)(A) (often called compassionate release) lets a court reduce an already-imposed sentence [15][22]. It's worth being precise about what this statute actually requires, because it's sometimes described more loosely than the law allows. A motion under this section requires "extraordinary and compelling reasons," a standard the Sentencing Commission has defined mainly around serious or terminal medical conditions, advanced age combined with deteriorating health, or specific family circumstances [15][16]. Since the First Step Act, a prisoner can file this motion directly after exhausting BOP administrative remedies or waiting 30 days from a request to the warden, without needing the BOP's sign-off [22]. It is not, however, a general mechanism for rewarding programming, teaching, or mentoring on its own. That kind of record can support other things (RDAP recommendations, halfway house placement decisions, FSA programming credit), but the statutory test itself turns on an independent extraordinary-and-compelling basis, not on good conduct alone [15][16][22].

Stacking the credits: a seven-year sentence under best-case assumptions

Rather than treat these credits as independent line items, it helps to run them in sequence against one sentence length and see where the assumptions pile up. Take an 84-month term:

Imposed: 84 months
Good Conduct Time knocks off roughly 12.6 months, landing around 72 months
A maxed-out FSA credit (the full 365-day cap, which requires a sustained minimum/low PATTERN score plus continuous programming) brings that to roughly 60 months
A full RDAP reduction (available here because 84 months clears the 37-month threshold, assuming documented eligibility) brings it to roughly 48 months

Forty-eight months is a floor, not a forecast. Reaching it requires three things happening simultaneously and staying true for years: a PATTERN score that never drifts out of the low/minimum band, a substance-abuse history that clinically supports RDAP admission, and a disciplinary file with nothing on it. Any one of those slipping pushes the number back up.

Then there's the piece that's hardest to pin down: prerelease custody. Second Chance Act authority allows up to a year split between a halfway house and home confinement layered on top of that 48-month figure [9]. But GAO's finding that the BOP does not centrally track who has already earned that eligibility, combined with the agency's own acknowledgment of limited contractual bed space, means the gap between "eligible for" and "actually placed in" prerelease custody is a real, documented weakness in how the system currently operates [13][21]. That gap adds real uncertainty on top of the arithmetic above.

Want to see how these credits apply to a specific sentence?

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Frequently Asked Questions

How is a federal sentence calculated?

An offense level (1–43) is combined with a Criminal History Category (I–VI) on the U.S. Sentencing Guidelines table to produce an advisory range in months [17]. From there, Good Conduct Time, FSA credits, and RDAP (if applicable) determine actual time served.

Without any credits at all, what fraction of a sentence gets served?

Nearly all of it: Good Conduct Time is the only credit that applies automatically, and it brings the baseline down to roughly 85%. Everything past that (FSA, RDAP) has to be actively earned or qualified for [2][5][7].

Does everyone get Good Conduct Time?

Only people with sentences longer than 12 months, and only up to 54 days per year of the term imposed. It's not a bonus at the end; it's calculated up front and can be forfeited as a disciplinary sanction [1][23].

Does a longer sentence earn FSA credits faster?

No. The earning rate is set by PATTERN risk score, not by how long the sentence is. A minimum- or low-risk score earns the higher rate; a medium or high score earns nothing at all under current rules [3][5].

What sentence length is needed to get the full year off from RDAP?

Roughly 37 months or more. Shorter sentences can still qualify for RDAP admission but receive a smaller ceiling on the reduction, and eligibility separately requires a documented substance-abuse history and no disqualifying violent priors [6][7].

What happens to earned credit after a disciplinary write-up?

It can be forfeited. Both Good Conduct Time and FSA credits are subject to loss as a disciplinary sanction under 28 CFR Part 541, which is why a clean record matters for the entire sentence, not just the first year [1][5][23].

Should the release date shown on the BOP inmate locator be treated as final?

Treat it as a planning estimate rather than a guarantee. Reporting on inmate litigation over sentence calculations has described how projected and conditional dates reflect potential credits, not credits already earned and applied, and becoming eligible for a date doesn't guarantee placement on it [21].

Is compassionate release the same as being rewarded for good behavior?

No. It's a narrow statute requiring 'extraordinary and compelling reasons': typically serious medical circumstances, advanced age, or specific family circumstances, reviewed by a judge, not a general credit for programming or mentoring [15][16].

Try the calculator

The Navigate Justice Sentencing Calculator walks through offense level and criminal history category (federal) or your state's grid, then estimates Good Conduct Time, FSA, and RDAP credits against the 2024 Guidelines Manual [17]. It's built as an educational starting point for a conversation with a licensed attorney, not a prediction of any specific outcome. Treat the output the same way this article should be treated: as a ceiling and a framework, not a promise.

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Sources

Disclaimer

This article is for general educational purposes only and is not legal advice. Federal sentencing and BOP credit programs are fact-specific, change with policy updates, and depend on individual eligibility determinations made by the Bureau of Prisons and the courts. Nothing here creates an attorney-client relationship. If you or someone you know is facing federal sentencing or incarceration, consult a licensed criminal defense attorney about your specific situation.