Federal time runs long because there is no federal parole. If you are sentenced in federal court, plan on serving at least 85% of the sentence the judge imposes, with the remaining sliver available only through good conduct credit and a few narrow programs. A 10-year federal sentence works out to roughly eight and a half years in custody for someone who keeps a clean record; a two-year sentence works out to about 20 months. How long is fed time, in practice, is mostly a question of what number the judge writes down, because the percentage served barely moves.
No Parole in the Federal System
The Sentencing Reform Act of 1984 eliminated parole for federal crimes committed after November 1, 1987.1U.S. Department of Justice. Organization, Mission, and Functions Manual – United States Parole Commission There is no board that can decide, a few years in, that someone has served enough. The sentence the judge imposes is the sentence, minus specific credits that Congress has authorized.
The main credit is good conduct time. An eligible inmate can earn up to 54 days off for each year of the imposed sentence by maintaining a clean disciplinary record.2Office of the Law Revision Counsel. 18 U.S. Code 3624 – Release of a Prisoner That is where the 85% figure comes from. Someone serving life is not eligible for any good conduct time. Serious disciplinary infractions can cost accumulated credit, but most inmates earn close to the full amount.
How the Judge Arrives at the Number
Every federal sentence begins with the U.S. Sentencing Guidelines, maintained by the U.S. Sentencing Commission under 28 U.S.C. § 994.3Office of the Law Revision Counsel. 28 U.S. Code 994 – Duties of the Commission The guidelines produce a range in months by combining an offense level (1 to 43) with a criminal history category (I to VI). The intersection on the sentencing table is the recommended range.4United States Sentencing Commission. 2025 Guidelines Manual – Chapter 5
The guidelines are advisory. Judges must consider them but can go higher or lower with a written explanation.5United States Sentencing Commission. An Overview of the Federal Sentencing Guidelines They also weigh the factors in 18 U.S.C. § 3553(a): nature of the offense, the defendant’s background, seriousness, deterrence, and public safety.6Office of the Law Revision Counsel. 18 U.S. Code 3553 – Imposition of a Sentence
For certain crimes, Congress has set a floor below which no judge can sentence regardless of what the guidelines say. Federal drug cases carry five- and ten-year mandatory minimums tied to the type and weight of the substance, rising to 20 years if a death or serious bodily injury resulted from the drugs.7Office of the Law Revision Counsel. 21 U.S. Code 841 – Prohibited Acts Using a firearm during a drug trafficking crime or crime of violence triggers separate mandatory sentences under 18 U.S.C. § 924(c) that run consecutively to the underlying sentence, so the years stack rather than overlap.8Office of the Law Revision Counsel. 18 U.S. Code 924 – Penalties
What Can Bring the Sentence Down Before It’s Imposed
Because 85% of the imposed sentence is close to fixed, the biggest reductions in fed time happen before the judge writes the number. Three mechanisms do most of the work.
Acceptance of responsibility. Defendants who plead guilty typically get a two-level reduction in offense level. When the offense level is 16 or higher and the plea is timely enough to spare trial preparation, the court can grant one more level.9U.S. Congress. CRS Legal Sidebar – Acceptance of Responsibility A three-level drop meaningfully shifts the range, which is part of why roughly 90% of federal defendants plead guilty.
Substantial assistance. Cooperating against someone else is the single most powerful reduction tool in federal court. When a defendant provides significant help, the government can file a 5K1.1 motion asking the judge to sentence below the guidelines range, and this is the only common mechanism that lets a judge go below a mandatory minimum.10United States Courts. Study Reveals Differences in Substantial Assistance Reductions Only the prosecutor can file the motion.
The safety valve. For certain drug offenses, a defendant can be sentenced below the mandatory minimum without cooperating against anyone. Under 18 U.S.C. § 3553(f), the defendant must have a limited criminal history (no more than four criminal history points, with no prior violent or serious offenses), must not have used violence or possessed a firearm during the offense, must not have been a leader or organizer, and must have truthfully disclosed everything they know about the crime.6Office of the Law Revision Counsel. 18 U.S. Code 3553 – Imposition of a Sentence The First Step Act expanded the safety valve in 2018 to reach defendants with slightly more criminal history than the original version allowed.
What Can Shorten Time Once the Sentence Is Running
After sentencing, four programs can reduce actual time in prison. None are automatic.
Good conduct time. Inmates serving sentences longer than one year, other than life, can earn up to 54 days per year of the imposed sentence.2Office of the Law Revision Counsel. 18 U.S. Code 3624 – Release of a Prisoner The Bureau of Prisons reviews compliance each year.
First Step Act earned time credits. The 2018 First Step Act created additional credits for inmates who participate in recidivism reduction programs and productive activities.11Federal Bureau of Prisons. Overview of the First Step Act Eligible inmates earn 10 days of credit for every 30 days of programming, with those at higher risk levels earning 15 days per 30.12United States Sentencing Commission. First Step Act Earned Time Credits Data Snapshot These credits don’t shrink the sentence itself; they move a person into pre-release custody, such as a halfway house or home confinement, earlier. Inmates convicted of certain disqualifying offenses, including many violent and sex-related crimes, cannot earn them at all.
Residential Drug Abuse Program. RDAP is a nine-month intensive treatment program for inmates with a documented substance abuse problem. Completing it can take up to 12 months off the sentence for inmates serving 37 months or more, up to nine months off for sentences of 31 to 36 months, and up to six months off for sentences of 30 months or less.13Federal Bureau of Prisons. Inmate Security Designation and Custody Classification – Program Statement 5331.002 Waitlists can be long.
Compassionate release. A court can reduce a sentence in extraordinary and compelling circumstances, such as a terminal illness or debilitating medical condition, either on a motion from the Bureau of Prisons director or from the defendant after exhausting administrative remedies.14Office of the Law Revision Counsel. 18 U.S. Code 3582 – Imposition of a Sentence of Imprisonment Most requests are denied. It is not a planning tool for a typical case.
What Federal Sentences Actually Look Like
The U.S. Sentencing Commission publishes annual data on actual sentences imposed. For fiscal year 2024, average sentences by offense type were:15United States Sentencing Commission. 2024 Annual Report and Sourcebook
- Drug trafficking: 82 months (about 6 years, 10 months)
- Firearms offenses: 50 months (about 4 years, 2 months)
- Fraud, theft, and embezzlement: 21 months (about 1 year, 9 months)
- Immigration offenses: 12 months
These averages span a wide range of conduct. A low-level drug courier with no record might receive 24 months; a cartel organizer with prior convictions could get 30 years or more within the same offense category. Apply the 85% rule to whatever number the judge lands on and you have a realistic estimate of time in custody.
Supervised Release After Prison
Federal time doesn’t end at the prison gate. Nearly every federal sentence includes a term of supervised release beginning the day a person walks out, governed by 18 U.S.C. § 3583. Maximum terms depend on the severity of the original offense: up to five years for a Class A or B felony, up to three years for a Class C or D felony, and up to one year for a Class E felony or misdemeanor.16Office of the Law Revision Counsel. 18 U.S. Code 3583 – Inclusion of a Term of Supervised Release After Imprisonment Certain offenses, particularly sex crimes and some drug trafficking, can carry supervised release for life.
During supervised release, a person reports to a federal probation officer, submits to drug testing, maintains employment, and avoids contact with other convicted individuals. Judges have wide discretion to tailor other conditions. Violations can send someone back to prison, with revocation maximums of five years for a Class A felony, three years for a Class B felony, two years for a Class C or D felony, and one year for lesser offenses.16Office of the Law Revision Counsel. 18 U.S. Code 3583 – Inclusion of a Term of Supervised Release After Imprisonment When people ask how long fed time is, that supervised tail is part of the honest answer.