First Step Act Credits: What Federal Defendants Actually Serve
The federal guideline range is only the starting point. What a defendant actually serves after the First Step Act (FSA) can be meaningfully shorter — sometimes by years. This guide explains how FSA earned time credits work, who qualifies, and how they interact with good-time credit and the guideline range shown by the calculator on this site.
Guideline range vs. actual time served
The calculator on this site estimates the U.S. Sentencing Guidelines range — the months the judge is expected to impose at sentencing. That is not the same as the number of months the defendant physically spends in Bureau of Prisons (BOP) custody. Two federal programs reduce actual time served:
- Good conduct time under 18 U.S.C. § 3624(b): up to 54 days per year served, roughly 15% off the sentence for defendants who avoid disciplinary infractions.
- FSA earned time credits under 18 U.S.C. § 3632(d)(4): 10 or 15 days of credit for every 30 days of successful participation in approved evidence-based recidivism reduction (EBRR) programs and productive activities (PAs).
How FSA credits are earned
Any eligible inmate who successfully completes 30 days of EBRR programming or productive activity earns 10 days of time credit toward supervised release or prerelease custody (halfway house / home confinement).
An inmate assessed at low or minimum risk of recidivism on the PATTERN tool for two consecutive assessments earns 15 days per 30 days of programming — a 50% bump over the baseline.
Credits apply toward prerelease custody or early transfer to supervised release, capped at 12 months of early supervised release. Time in a halfway house or home confinement counts as custody, but is spent outside of a BOP facility.
Who is eligible
Most federal defendants can earn FSA credits, but 18 U.S.C. § 3632(d)(4)(D) lists roughly 60 disqualifying offenses. Common exclusions in the Eastern District of Tennessee:
- Certain firearm offenses under 18 U.S.C. § 924(c)
- Fentanyl trafficking above threshold quantities
- Sex offenses and offenses against minors
- Terrorism-related offenses
- Certain violent offenses resulting in death or serious injury
Non-citizens with final orders of removal cannot apply FSA credits toward early release, though they can still earn them.
The figures: what this looks like in practice
A worked example
Consider a defendant sentenced to 120 months for a non-violent drug offense that is FSA-eligible, assessed at low risk on PATTERN, and clean of disciplinary infractions:
- Good-time credit at 54 days/year → ~18 months off
- FSA credits at 15 days/30 days of programming → up to 12 months applied to early supervised release
- Remaining time in halfway house / home confinement further reduces BOP facility time
A nominal 120-month sentence can realistically translate to roughly 80–85 months of actual BOP custody — a very different picture from the guideline range alone.
Use the calculator on the home page for the guideline estimate, then talk to a federal defense attorney about FSA eligibility, PATTERN scoring, and programming strategy — the details are case-specific and matter enormously.