by Richard Resch

When the United States Sentencing Commission lowers a Guideline range, the revision ordinarily applies only to defendants sentenced after the effective date. For the thousands of people already serving sentences calculated under the old, harsher Guideline range, the change might seem irrelevant. But a motion under 18 U.S.C. § 3582(c)(2) provides one narrow mechanism through which a previously sentenced defendant can seek relief. The U.S. Sentencing Commission’s 2026 Primer on Retroactive Guideline Amendments reviews the statute, the governing policy statement, and the substantial body of case law that has developed around this provision. What emerges is a process that, while offering genuine hope to some defendants, is constrained by procedural limitations and interpretive disagreements that can determine whether relief is available at all.

The Statutory Framework

A federal sentence is ordinarily a final judgment that is not subject to modification. Section 3582(c)(2) carves out an exception. It authorizes a court to reduce a term of imprisonment when the defendant was sentenced under a Guideline range that the Commission has subsequently lowered, provided any reduction is consistent with the Commission’s policy statements. The Supreme Court confirmed this framework in Dillon v. United States, 560 U.S. 817 (2010), describing the provision as allowing only a “limited adjustment” to an otherwise final sentence.

The policy statement that governs these proceedings is § 1B1.10 of the Guidelines Manual. Under this provision, courts must follow a three-step analysis. First, they check whether any of the retroactive amendments listed in § 1B1.10(d) applies to the defendant’s case. Second, they calculate the amended Guideline range that would have applied had the retroactive amendment been in effect at the original sentencing, substituting only the listed amendment while leaving every other Guideline calculation untouched. Third, they determine whether a reduction is warranted for the individual defendant and, if so, how large it should be. At this final step, the court considers the factors set forth in 18 U.S.C. § 3553(a), the defendant’s post-sentencing conduct and public safety concerns.

That It is the second step which merits further attention because it imposes a significant constraint. The court may not revisit any Guideline determination other than the one affected by the retroactive amendment. If the sentencing judge made an error in calculating criminal history, for instance, or misapplied a specific offense characteristic, those mistakes remain part of the amended Guideline range. The proceeding is a targeted recalculation, and defendants who were sentenced with errors elsewhere in the Guideline computation have no opportunity to correct them through this method. 

However, the prohibition on revisiting “other guideline application decisions” is not as absolute as it may first appear. The Seventh Circuit drew an important distinction in United States v. Koglin, 822 F.3d 984 (7th Cir. 2016), holding that this instruction bars relitigating factual findings made at the original sentencing but does not prevent the court from recognizing how a retroactive amendment affects other Guideline provisions whose operation depends on the amended one. Where one provision interacts with the output of the amended provision, the amended result must be carried through those interacting provisions when determining the amended Guideline range. The Second Circuit adopted the same principle in United States v. Jarvis, 883 F.3d 18 (2d Cir. 2018) (per curiam), holding that a court is not required “to ignore the effect of a lowered base offense level on the other Guidelines provisions that, combined with [the] original base offense level, produced the defendant’s initial sentencing range.” More recently, the Fourth Circuit applied this reasoning in United States v. Barrett, 133 F.4th 280 (4th Cir. 2025), holding that the District Court erred when it gave retroactive effect to Amendment 821’s change to the defendant’s criminal history category but failed to carry that change through to the offense level, where the two interacted under the version of § 2D1.1(b)(17) then in effect.

Notably, the cascading effect does not always benefit the defendant. In both Koglin and Jarvis, carrying the amendment through the full calculation revealed that the defendant’s ultimate Guideline range remained unchanged, defeating eligibility for a reduction. This distinction is worth raising in any case where a retroactive amendment affects a provision that feeds into other parts of the Guideline computation, whether the resulting interaction favors the defendant or not.

Procedural Limitations That Disadvantage Defendants

Because § 3582(c)(2) authorizes only a limited sentence adjustment, courts have held that the procedural protections afforded at an original sentencing do not apply. The differences are stark.

Defendants have no right to a hearing. Courts can resolve these motions entirely on paper, and most do. While a defendant must be given the opportunity to respond to any new information the court relies upon, that opportunity can be satisfied through written submissions alone. The Eleventh Circuit confirmed in United States v. Caraballo-Martinez, 866 F.3d 1233 (11th Cir. 2017), that District Courts need not hold hearings or even require the defendant’s presence.

More troubling, every circuit to address the question has concluded that defendants have no constitutional or statutory right to appointed counsel in § 3582(c)(2) proceedings. The practical consequence is that incarcerated individuals, many without legal training, must identify applicable retroactive amendments, calculate amended Guideline ranges, and present legal arguments to the court, all without professional assistance. Given the technical complexity of Guidelines calculations, this gap between the sophistication the process demands and the resources defendants can actually access is substantial.

The Supreme Court has acknowledged that the depth of a court’s explanation may vary with the complexity of the case. In Chavez-Meza v. United States, 585 U.S. 109 (2018), the Court ruled that in straightforward cases, a brief statement referencing the record and the § 3553(a) factors may suffice. However, the Fourth Circuit has cautioned that a court cannot ignore mitigation evidence and summarily deny a motion, leaving both the defendant and the appellate court without any understanding of its reasoning. United States v. Martin, 916 F.3d 389 (4th Cir. 2019).

Drug Quantity: A Procedural Opening Worth Examining

The Primer identifies an issue that is worth examining carefully. At the original sentencing, a court may have found only a threshold drug quantity because a more precise calculation was unnecessary under the then-applicable Guideline. A retroactive amendment might raise that threshold, making the defendant’s eligibility turn on whether the actual quantity fell above or below the new line. In that situation, the § 3582(c)(2) court must make a new, more specific finding. The Sixth Circuit addressed this in United States v. Moore, 582 F.3d 641 (6th Cir. 2009), and the D.C. Circuit confirmed the principle in United States v. Wyche, 741 F.3d 1284 (D.C. Cir. 2014). Any supplemental finding must be supported by the record and cannot contradict findings from the original sentencing. The Ninth Circuit has further held in United States v. Rodriguez, 921 F.3d 1149 (9th Cir. 2019), that the court is bound by a quantity from the original sentencing only if the judge made a specific finding or the defendant admitted to a specific amount. Defense counsel reviewing a client’s presentence report should look for threshold-only drug findings, because they may create an opening to contest the quantity and establish eligibility for a reduction.

Who Qualifies:
The “Based On” Requirement

Section 3582(c)(2) limits relief to defendants sentenced to a term of imprisonment “based on a sentencing range that has subsequently been lowered.” The Supreme Court interpreted this language in two companion decisions issued in 2018, and the results point in different directions depending on the circumstances.

In Hughes v. United States, 584 U.S. 675 (2018), the Court held that defendants who entered binding plea agreements under Federal Rule of Criminal Procedure 11(c)(1)(C), so-called Type-C pleas, generally satisfy the “based on” requirement. The reasoning was straightforward. Because a District Court must evaluate the recommended sentence against the defendant’s Guidelines range before accepting such a plea, the Guidelines remain a relevant part of the sentencing framework.

The same day, the Supreme Court decided Koons v. United States, 584 U.S. 700 (2018), and reached a far less favorable conclusion for a different category of defendants. In Koons, the defendants’ initial Guideline ranges fell entirely below a statutory mandatory minimum. Although they ultimately received sentences below the mandatory minimum based on their substantial assistance to the Government, the Court held that their sentences were “based on” the mandatory minimum and the separate substantial-assistance provisions, not on the Guideline range. From the Court’s perspective, a Guideline range that falls below a mandatory minimum is “tossed aside” in favor of the statutory floor. Defendants in this situation are categorically ineligible for relief under § 3582(c)(2), regardless of how dramatically the Commission has lowered the applicable Guideline.

Koons left open the question of how to treat defendants whose Guideline ranges straddled a mandatory minimum or a statutory maximum. The circuits have not reached consensus. The Ninth Circuit extended Koons to bar relief where the Guideline range straddled the mandatory minimum, reasoning in United States v. Buenrostro, 895 F.3d 1160 (9th Cir. 2018), that the mandatory minimum displaces the range even in those circumstances. On the statutory maximum side, the Third and Fifth Circuits have split. The Third Circuit held in United States v. Rivera-Cruz, 904 F.3d 324 (3d Cir. 2018), that a Guideline range straddling the statutory maximum means the sentence is not “based on” the range, while the Fifth Circuit reached the opposite result in United States v. Lopez, 989 F.3d 327 (5th Cir. 2021). These unresolved splits mean that a defendant’s eligibility for relief may depend as much on geographic happenstance as on the merits of the claim.

Career Offenders and the Eligibility Barrier

Defendants sentenced under the career offender Guideline at § 4B1.1 face an additional obstacle. That provision requires courts to apply the greater of the career offender offense level or the offense level derived from the underlying offense of conviction. When the career offender level is higher, as it typically is, a retroactive amendment to the underlying offense Guideline does nothing to lower the defendant’s applicable range. Without a lower range, no reduction is available.

However, there is an exception. In cases where the offense level for the underlying crime exceeded the career offender offense level at the original sentencing, a retroactive amendment to the Chapter Two offense Guideline can reduce the defendant’s range. Even then, the career offender provision continues to operate as a floor because the amended sentence cannot drop below the range that would have applied under § 4B1.1. The result is that career offenders are largely excluded from the benefits of retroactive amendments, even when the Commission itself has determined that the underlying offense Guideline was too severe.

Reductions Below the
Amended Guideline Range

The general rule is clear. A court may not reduce a defendant’s sentence below the minimum of the amended Guideline range. The sole exception applies to defendants who received a downward departure at the original sentencing based on a government motion recognizing their substantial assistance. For these defendants, the court may grant a “comparably less” reduction below the amended range. Several circuits have endorsed two methods for calculating this comparable reduction, one based on the percentage departure from the original range and another based on the number of offense levels the departure represented.

A contested question is whether the court’s authority to impose a sentence below the amended Guideline range extends beyond the substantial-assistance departure to encompass other reductions granted at the original sentencing. The Sixth and Eleventh Circuits have said no, limiting the below-range reduction to the portion attributable to substantial assistance. See United States v. Taylor, 815 F.3d 248 (6th Cir. 2016); United States v. Marroquin-Medina, 817 F.3d 1285 (11th Cir. 2016). The Seventh and Ninth Circuits have taken a broader view. See United States v. Phelps, 823 F.3d 1084 (7th Cir. 2016); United States v. D.M., 869 F.3d 1133 (9th Cir. 2017). In the Ninth Circuit’s formulation, the court may consider “additional applicable departures” from the original sentence, not just the portion attributed to substantial assistance. D.M. For defendants who received multiple downward reductions, the difference between these approaches can translate into years of imprisonment.

A related split concerns whether courts may consider a § 5G1.3(b) adjustment when determining the amount of a reduction. Section 5G1.3(b) instructs a sentencing court to adjust the sentence to credit the defendant for time already served on an undischarged term of imprisonment that resulted from another offense that is relevant conduct to the instant offense under § 1B1.3(a)(1), (a)(2), or (a)(3), if the court determines that the Bureau of Prisons will not credit that time to the federal sentence. The Second and Eighth Circuits have held that this adjustment may not be used to reduce a sentence below the amended Guideline range in a § 3582(c)(2) proceeding. See United States v. Zapatero, 961 F.3d 123 (2d Cir. 2020); United States v. Helm, 891 F.3d 740 (8th Cir. 2018). The Eleventh Circuit disagreed in United States v. Gonzalez-Murillo, 852 F.3d 1329 (11th Cir. 2017) (per curiam), holding that, when a § 5G1.3(b) adjustment applied at the original sentencing, the District Court must reapply that adjustment to any reduced sentence it imposes under § 3582(c)(2). For defendants who received this credit at their original sentencing, the split can determine whether that credit survives the reduction.

Successive Motions, Sua Sponte Denials, and Waiver

Neither the statute nor the policy statement expressly prohibits successive motions based on the same retroactive amendment, and every circuit to consider the issue agrees there is no jurisdictional bar. See United States v. Mofle, 989 F.3d 646 (8th Cir. 2021) (collecting cases). The practical picture is more complicated.

The Fourth Circuit takes the hardest line, treating § 3582(c)(2) as containing an implied, nonjurisdictional prohibition on both motions for reconsideration and successive motions based on the same amendment. United States v. May, 855 F.3d 271 (4th Cir. 2017); United States v. Goodwyn, 596 F.3d 233 (4th Cir. 2010). The Seventh, Eighth, and Tenth Circuits allow motions for reconsideration but impose the same time limit that applies to filing a notice of appeal under Federal Rule of Appellate Procedure 4(b). United States v. Redd, 630 F.3d 649 (7th Cir. 2011); Mofle; United States v. Warren, 22 F.4th 917 (10th Cir. 2022); United States v. Randall, 666 F.3d 1238 (10th Cir. 2011). Miss that window, and a later motion raising the same issue is untimely. 

A related concern arises when a District Court raises and denies a § 3582(c)(2) motion on its own initiative, without any input from the defendant. The Seventh Circuit has held that a court may not recharacterize a defendant’s request in a way that effectively uses up the defendant’s opportunity to seek a reduction without first warning the defendant. United States v. Guerrero, 946 F.3d 983 (7th Cir. 2020). In contrast, the Eighth Circuit has strongly suggested that a defendant who wants to be heard after a sua sponte denial must file within the Rule 4(b) appeal deadline, even though the defendant may not have known the court was considering the issue at all. Mofle. The Fourth Circuit has acknowledged the “self-evident” unfairness of this situation but stopped short of adopting a rule to address it. May. For incarcerated defendants who depend on prison mail systems for legal communications, a sua sponte denial they learn about weeks later can effectively eliminate their access to this relief.

Defendants may also waive the right to seek a reduction under § 3582(c)(2) as part of a plea agreement, though courts scrutinize the specificity of such waivers. The Tenth Circuit held in United States v. Chavez-Salais, 337 F.3d 1170 (10th Cir. 2003), that a general waiver of collateral attacks does not clearly encompass a § 3582(c)(2) motion, since such a motion seeks a modification rather than an attack on the original sentence. Defense counsel negotiating plea agreements should be aware of this distinction, because broadly worded waiver language prohibiting “any collateral attack” may not foreclose a § 3582(c)(2) motion in circuits that follow Chavez-Salais. Even where a defendant has signed a valid waiver, the statute preserves the court’s independent authority to reduce the sentence on its own motion. The Ninth Circuit underscored this in United States v. Sainz, 933 F.3d 1080 (9th Cir. 2019), holding that a court may not sua sponte invoke a defendant’s waiver to deny an otherwise valid motion. It remains the Government’s responsibility to assert the waiver, and the Government may choose not to do so. A defendant whose plea agreement contains waiver language should not assume that the waiver forecloses relief, particularly if the waiver is broadly framed as a collateral-attack waiver rather than a specific waiver of § 3582(c)(2) relief. Counsel should examine the waiver language and governing circuit law and, where a nonfrivolous argument remains, consider filing and requiring the Government to decide whether to invoke the waiver.

Interaction with Habeas Relief and the First Step Act

Section 3582(c)(2) and habeas relief under 28 U.S.C. § 2255 serve distinct functions, and courts have firmly resisted efforts to blur the line between them. When the relief sought is a sentence reduction based on a retroactive Guideline amendment, the proper avenue is § 3582(c)(2), not § 2255. See Simon v. United States, 359 F.3d 139 (2d Cir. 2004); United States v. Carter, 500 F.3d 486 (6th Cir. 2007). Conversely, a motion that attacks the validity of the conviction or original sentence is treated as a § 2255 motion even if it is styled as a § 3582 motion. Carter. Courts have also held that a sentence reduction under § 3582(c)(2) does not create a new, intervening judgment or reset the count for purposes of the Antiterrorism and Effective Death Penalty Act’s restrictions on second or successive § 2255 motions. See United States v. Jones, 796 F.3d 483 (5th Cir. 2015); White v. United States, 745 F.3d 834 (7th Cir. 2014); Sherrod v. United States, 858 F.3d 1240 (9th Cir. 2017); United States v. Quary, 881 F.3d 820 (10th Cir. 2018) (per curiam); Armstrong v. United States, 986 F.3d 1345 (11th Cir. 2021).

First Step Act § 404 motions occupy separate procedural ground as well. Several circuits have classified them under § 3582(c)(1)(B), a different exception to the finality rule. See United States v. Holloway, 956 F.3d 660 (2d Cir. 2020); United States v. Easter, 975 F.3d 318 (3d Cir. 2020); United States v. Chambers, 956 F.3d 667 (4th Cir. 2020); United States v. Alexander, 951 F.3d 706 (6th Cir. 2019); United States v. Mannie, 971 F.3d 1145 (10th Cir. 2020). The Seventh and Eleventh Circuits have characterized the First Step Act itself as the operative procedural vehicle. See United States v. Sutton, 962 F.3d 979 (7th Cir. 2020); United States v. Edwards, 997 F.3d 1115 (11th Cir. 2021). Either way, § 404 relief is not governed by § 3582(c)(2). That distinction is significant because the limitations specific to § 3582(c)(2) proceedings, including the constraints of § 1B1.10, do not automatically apply to First Step Act § 404 motions. See Concepcion v. United States, 597 U.S. 481 (2022).

Supervised Release:
An Alternative Avenue

Section 3582(c)(2) does not authorize a court to reduce a term of supervised release. But the commentary to § 1B1.10 identifies an alternative path. When the prohibition on reducing a sentence below time already served prevents a court from granting a reduction in imprisonment, the court may take that unrealized reduction into account when considering a motion for early termination of supervised release under 18 U.S.C. § 3583(e)(1). The commentary cautions that this factor alone does not automatically justify early termination. The court must still evaluate the totality of the circumstances, including the term of supervised release that would have been appropriate had the sentence reduction been possible. For defendants who have already served their prison terms but remain on supervision, this provision may offer the only practical benefit from a retroactive amendment.

Appellate Review and the
Sixth Circuit Outlier

Most circuits have treated orders denying § 3582(c)(2) motions as final decisions reviewable under the general appellate jurisdiction statute, 28 U.S.C. § 1291, rather than as sentencing appeals confined by § 3742(a)’s narrower categories. The Second, Third, Fifth, Seventh, Ninth, Tenth, and D.C. Circuits all follow that general approach. See United States v. McGee, 553 F.3d 225 (2d Cir. 2009); United States v. Rodriguez, 855 F.3d 526 (3d Cir. 2017); United States v. Calton, 900 F.3d 706 (5th Cir. 2018); United States v. Purnell, 701 F.3d 1186 (7th Cir. 2012); United States v. Dunn, 728 F.3d 1151 (9th Cir. 2013); United States v. Washington, 759 F.3d 1175 (10th Cir. 2014); United States v. Jones, 846 F.3d 366 (D.C. Cir. 2017). The result is broader appellate review than the Sixth Circuit allows, though courts do not always describe the merits standard in identical terms.

The Sixth Circuit remains the outlier, although its current doctrine is more precise than the original jurisdictional framing. In United States v. Bowers, 615 F.3d 715 (6th Cir. 2010), the Court held that Booker-style unreasonableness in a § 3582(c)(2) proceeding is not a cognizable “violation of law” under § 3742(a)(1). The Sixth Circuit later clarified that § 1291 supplies subject-matter jurisdiction and that § 3742(a) operates as a nonjurisdictional limit on the relief available, but it continues to restrict § 3582(c)(2) appeals to claims that fit § 3742(a)’s statutory gateways, such as a violation of law or an incorrect application of the Guidelines. See United States v. Smithers, 960 F.3d 339 (6th Cir. 2020); United States v. Marshall, 954 F.3d 823 (6th Cir. 2020). While the practical impact of this split may be modest given the other limits on § 3582(c)(2) relief, it adds yet another layer of geographic inconsistency to a process that already varies meaningfully from one circuit to the next.

Conclusion

The retroactive amendment process represents Congress’ recognition that when the Sentencing Commission determines a Guideline range was too severe, fairness demands that those already sentenced under the harsher standard have some opportunity for relief. But the mechanism is constrained at every turn. Defendants must proceed without guaranteed counsel through a process that demands technical precision. Career offenders are largely excluded. Mandatory minimums can render Guideline amendments meaningless. Circuit splits on fundamental eligibility questions mean that identically situated defendants may receive different outcomes based solely on where they were prosecuted.

For the incarcerated individuals who stand to benefit from retroactive amendments, understanding these rules is a practical necessity. And for anyone concerned with the fairness of the federal sentencing system, the limitations of § 3582(c)(2) serve as a reminder that the difference between a sentencing reform on paper and actual relief for the person serving the sentence is often simply a matter of geography.   

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