To file a motion for modification of sentence in federal court, you prepare a written motion in the district that sentenced you, ground it in the specific statute or rule that authorizes the change you want, attach the evidence that supports it, and serve a copy on the U.S. Attorney’s office that prosecuted your case. The motion is not an appeal of your conviction. It is a focused request to the sentencing judge to change the punishment, and it will only be considered if it fits one of the narrow grounds federal law recognizes.
Before going further: this covers federal sentences. State systems have their own rules for reconsidering or reducing sentences, and they differ widely from state to state. If you were sentenced in state court, the procedure below does not apply to you.
Pick the Legal Ground First
Federal courts cannot modify a sentence just because you think it was too harsh. Your motion has to identify a specific statutory or rule-based authority for the court to act. Five grounds cover almost every situation.
Rule 35(a): Clear Error
Federal Rule of Criminal Procedure 35(a) lets the court fix an arithmetical, technical, or other clear mistake in the sentence. The window is 14 days after the sentence is orally announced.1Cornell Law School. Federal Rules of Criminal Procedure Rule 35 – Correcting or Reducing a Sentence This is not a vehicle for arguing the sentence was unfair. It catches real errors, like a miscalculated guideline range or a term that is legally impossible for the offense.
Rule 35(b): Substantial Assistance
If you helped the government investigate or prosecute someone else after sentencing, the government may file a Rule 35(b) motion asking the court to reduce your sentence. Only the government can bring this motion. You cannot file it yourself. The deadline is generally one year after sentencing, with extensions when the useful information only came to light later.1Cornell Law School. Federal Rules of Criminal Procedure Rule 35 – Correcting or Reducing a Sentence
Section 3582(c)(2): Retroactive Guideline Changes
Under 18 U.S.C. § 3582(c)(2), a court can reduce a sentence when the U.S. Sentencing Commission lowers the guideline range that applied to your offense and makes the change retroactive. You, the Bureau of Prisons, or the court on its own can start this process.2Office of the Law Revision Counsel. 18 USC 3582 – Imposition of a Sentence of Imprisonment The court then applies the sentencing factors in 18 U.S.C. § 3553(a) and confirms the reduction is consistent with the Commission’s policy statements.
A current example is Amendment 821, effective November 1, 2023 and made retroactive on February 1, 2024. Part A limits the extra criminal history points added when a defendant committed the offense while on probation, parole, or supervised release. Part B creates a two-level reduction for certain zero-point offenders whose offense did not involve violence, firearms, terrorism, sex offenses, or other listed aggravating factors.3United States Sentencing Commission. Amendment 821 The First Step Act of 2018 is another route: it made the Fair Sentencing Act of 2010 retroactive for people sentenced under the old crack cocaine disparity and expanded the safety valve for certain low-level, nonviolent drug offenders.4Federal Bureau of Prisons. First Step Act Overview
Section 3582(c)(1)(A): Compassionate Release
Compassionate release under 18 U.S.C. § 3582(c)(1)(A) allows a court to reduce a sentence when extraordinary and compelling reasons justify it. Since the First Step Act, you can file it yourself. The Sentencing Commission’s policy statement at USSG §1B1.13 defines the qualifying categories: terminal illness, a serious medical condition that substantially reduces your ability to care for yourself in prison, inadequate medical care for a serious condition, age (at least 65 with serious age-related deterioration and having served at least 10 years or 75 percent of the sentence), and specific family circumstances involving the death or incapacitation of a caregiver.5United States Sentencing Commission. USSG 1B1.13 – Reduction in Term of Imprisonment Under 18 USC 3582(c)(1)(A)
Section 3583(e): Supervised Release
If you are on supervised release rather than in custody, 18 U.S.C. § 3583(e) lets the court change the conditions, extend the term, or terminate supervision early. Early termination becomes available after you have completed at least one year of supervised release, and the court must be satisfied that your conduct and the interest of justice support it.6Office of the Law Revision Counsel. 18 USC 3583 – Inclusion of a Term of Supervised Release After Imprisonment The court weighs many of the same § 3553(a) factors.
The Warden Request Before Compassionate Release
Compassionate release has a prerequisite that trips up self-filers. Before you can file in court, you must either exhaust the BOP’s administrative process or wait 30 days after the warden of your facility receives your written request, whichever comes first. Once those 30 days pass, you can file even if the BOP has not responded.2Office of the Law Revision Counsel. 18 USC 3582 – Imposition of a Sentence of Imprisonment7Federal Bureau of Prisons. Procedures for Implementation of 18 USC 3582 and 4205(g) Send the warden request in writing, keep proof of when it was received, and attach that proof to your court motion.
What the Motion Has to Contain
A sentence modification motion needs to do three things: identify who you are and what case this is, lay out the facts that have changed since sentencing, and explain why the law entitles you to relief.
Start with the caption: your full legal name, inmate registration number, the criminal case number, and the sentencing court. Have your original judgment and commitment order in front of you. It contains the exact sentence you are asking the court to change, and the judge will compare any proposed change against it.
The body should include a statement of facts covering the case history and the new circumstances that justify modification, followed by a legal argument section that connects those facts to the specific ground you are relying on: § 3582(c)(1)(A) for compassionate release, § 3582(c)(2) for a retroactive guideline change, Rule 35 for a sentencing error, or § 3583(e) for supervised release. Close with a request for relief that says exactly what you want: a specific number of months off, immediate release, a change to a supervised release condition, discharge from supervision.
Evidence to Attach
What you attach depends on the ground. For compassionate release, include comprehensive medical records, physician letters explaining diagnosis and prognosis, and documentation of any gaps in prison medical care. For a retroactive guideline amendment, attach the original presentence report and the calculations showing the amendment lowers your range. Across any ground, evidence of post-sentencing rehabilitation helps: completed educational or vocational programs, a clean disciplinary record, employment commitments, and letters from family, employers, or program staff. A viable release plan supports the argument that a reduced sentence serves the interests of justice and that you are not a danger to the community.
Where and How to File
File the motion and all supporting documents with the clerk of the federal district court where you were sentenced. Depending on the district’s local rules, filing may be electronic through CM/ECF, by mail, or in person. Incarcerated filers typically use mail. There is generally no filing fee for a motion in an existing criminal case, unlike civil actions.
After filing, serve a copy on the U.S. Attorney’s office that prosecuted your case, and file proof of service with the court. Skip this step or do it sloppily and the government has an easy basis to object.
After You File
The government gets a chance to respond, either supporting the motion, opposing it, or taking no position. Response deadlines are set by local rule and often run 14 to 30 days. Some districts have standing orders with specific briefing schedules for compassionate release motions.
The judge may rule on the papers or set a hearing. There is no fixed timeline. Motions based on a retroactive guideline change often move faster because the math is straightforward. Compassionate release motions, which require the court to weigh competing § 3553(a) factors, generally take longer.8Office of the Law Revision Counsel. 18 USC 3553 – Imposition of a Sentence
If the motion is granted, the court issues a new order modifying the sentence. Partial grants are common. If it is denied, your original sentence stays in effect, and the judge’s written order goes into the case record. A denial does not permanently bar a new motion if circumstances genuinely change, such as a medical condition that worsens after a compassionate release denial. What it does bar is refiling the same arguments in a new wrapper.
If the Motion Is Denied
You can appeal a denial to the federal circuit court of appeals. The notice of appeal must be filed in the district court within 14 days after the order denying the motion is entered.9Legal Information Institute. Federal Rules of Appellate Procedure Rule 4 – Appeal as of Right, When Taken Miss that deadline and you generally forfeit the appeal. The circuit court reviews for abuse of discretion, which is a deferential standard, so a successful appeal usually requires showing a procedural error or a result no reasonable judge could reach, not just disagreement with the outcome.
Getting a Lawyer
There is no guaranteed right to court-appointed counsel for a sentence modification motion. The Sixth Amendment right to counsel applies at sentencing, and courts have generally held that post-conviction motions like compassionate release fall outside that protection. Some district judges appoint counsel for complex compassionate release cases at their discretion, but you should not count on it. Private attorneys who handle these motions typically bill in the range of $150 to $500 per hour, with total cost varying with case complexity.
If you are filing on your own, check with the clerk’s office in your sentencing district about any local forms, particularly for § 3582(c)(2) motions, and see whether your federal public defender’s office publishes sample motions or guides for pro se filers.