Federal Mandatory Minimums

By Elizabeth Franklin-Best, Esq., and Christopher Zoukis, JD, MBA

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What is a mandatory minimum sentence?

A mandatory minimum is a term of imprisonment a statute requires a court to impose at least — regardless of the sentencing guideline range. In federal cases the most common sources are 21 U.S.C. § 841(b) (drug quantity), 18 U.S.C. § 924(c) (firearms in furtherance of a drug or violent crime), § 924(e) (the Armed Career Criminal Act), and 18 U.S.C. § 1028A (aggravated identity theft).

Key takeaways on federal mandatory minimums

• The statute beats the guideline. Where the statutory minimum exceeds the top of the guideline range, U.S.S.G. § 5G1.1 makes the statutory minimum the guideline sentence.
• There are exactly three doors below a mandatory minimum: the safety valve at 18 U.S.C. § 3553(f); a government motion under 18 U.S.C. § 3553(e) for substantial assistance; and executive clemency.
• A § 5K1.1 motion is not one of them. Melendez v. United States, 518 U.S. 120 (1996), held that a § 5K1.1 motion does not permit a sentence below a statutory minimum; § 3553(e) is required.
• Facts that raise a minimum are elements. Alleyne v. United States, 570 U.S. 99 (2013): “Facts that increase the mandatory minimum sentence are therefore elements and must be submitted to the jury and found beyond a reasonable doubt.”
• The prior-conviction enhancement requires a filing, before trial or plea. 21 U.S.C. § 851(a)(1): no increased punishment “unless before trial, or before entry of a plea of guilty, the United States attorney files an information.”
• § 924(c) sentences are consecutive to everything. § 924(c)(1)(D)(ii): “no term of imprisonment imposed on a person under this subsection shall run concurrently with any other term of imprisonment imposed on the person.”
• The First Step Act of 2018 changed the § 841 enhancement and the § 924(c) stacking rule, but not retroactively across the board.

Why a mandatory minimum overrides the guidelines

The guideline range is advisory; the statute is not. U.S.S.G. § 5G1.1 resolves the collision: where a statutorily required minimum sentence is greater than the maximum of the applicable guideline range, the statutory minimum becomes the guideline sentence.

The practical consequences are worth stating plainly.

Guideline reductions below the floor are worth nothing on their own. A defendant facing a ten-year statutory minimum whose guideline range would otherwise be 87–108 months does not benefit from acceptance of responsibility or a role reduction unless one of the three statutory doors opens. Those adjustments still belong in the record — they matter if the safety valve applies, and they matter for any later retroactive amendment — but standing alone they do not move the number.

A § 3553(a) variance cannot go below the floor either. The parsimony clause governs how a court chooses within its lawful authority. It does not create authority to sentence below a statutory minimum. See downward departure for what § 3553(a) can and cannot do.

§ 3582(c)(2) does not reach a sentence based on a minimum. Koons v. United States, 584 U.S. 700 (2018), held that defendants whose sentences rested on mandatory minimums and substantial-assistance departures were not eligible for a reduction when the drug guidelines were later lowered, because “[w]hat matters … is the role that the Guidelines range played in the selection of the sentence eventually imposed.”

This is why the charging decision matters more than almost anything else that happens in a federal case, and why counsel retained before an indictment has leverage that counsel retained afterwards does not.

The common federal triggers

Everything in the middle column below is the statutory floor — the least the statute permits. It is not a prediction of sentence. Read the three cautions immediately after the table before you take a number from it.

Statute	Statutory minimum (the floor)	Structure
21 U.S.C. § 841(b)(1)(A) — larger quantities	10 years; 15 years after one prior “serious drug felony or serious violent felony”; 25 years after two or more; 20 years if death or serious bodily injury results	Triggered by drug type and quantity. The statute’s own examples of (b)(1)(A) quantities include “1 kilogram or more of a mixture or substance containing a detectable amount of heroin”; “5 kilograms or more” of cocaine; “280 grams or more” of cocaine base; “400 grams or more” of a fentanyl mixture or “100 grams or more” of a fentanyl analogue
21 U.S.C. § 841(b)(1)(B) — mid-range quantities	5 years; 10 years after one prior serious drug felony or serious violent felony; 20 years if death or serious bodily injury results	The statute’s (b)(1)(B) quantities include “100 grams or more” of heroin; “500 grams or more” of cocaine; “28 grams or more” of cocaine base; “40 grams or more” of a fentanyl mixture or “10 grams or more” of a fentanyl analogue or “a fentanyl-related substance”; “100 kilograms or more” of marihuana or 100 plants
18 U.S.C. § 924(c)(1)(A) — firearm during a drug trafficking crime or crime of violence	5 years (possess in furtherance / use or carry); 7 years if brandished; 10 years if discharged	“in addition to the punishment provided for such crime of violence or drug trafficking crime.” Under § 924(c)(1)(D)(ii) it runs consecutively to everything
18 U.S.C. § 924(c)(1)(C) — repeat	25 years; life if the firearm “is a machinegun or a destructive device, or is equipped with a firearm silencer or firearm muffler”	Applies “[i]n the case of a violation of this subsection that occurs after a prior conviction under this subsection has become final”
18 U.S.C. § 924(e)(1) — Armed Career Criminal Act	15 years	A § 922(g) violation by a person with “three previous convictions … for a violent felony or a serious drug offense, or both, committed on occasions different from one another”
18 U.S.C. § 1028A(a)(1) — aggravated identity theft	2 years, consecutive	“in addition to the punishment provided for such felony.” Requires a predicate felony enumerated in § 1028A(c)
18 U.S.C. § 1028A(a)(2) — terrorism predicate	5 years, consecutive	Predicate offenses enumerated in 18 U.S.C. § 2332b(g)(5)(B)

Three reasons a floor is not a prediction

1. The quantity is a finding, not a fact you already know. The quantity that drives § 841(b) is the quantity the court attributes, and attribution runs through the relevant conduct rules at U.S.S.G. § 1B1.3 — which reach uncharged conduct and, in a conspiracy, co-participants’ conduct that was within the scope of, in furtherance of, and reasonably foreseeable in connection with the jointly undertaken activity. Two people in the same case routinely face different quantities. That is a contested finding, and it is contestable in the presentence report objection process.

2. The guideline range is frequently above the floor. A statutory minimum is the least the statute permits, not the most, and in many drug and firearms cases the guideline range calculated under Chapter Two sits well above it. A defendant who reads a five-year floor and stops reading has learned the wrong number.

3. What is charged decides what applies. Whether a § 924(c) count is added, whether a quantity is pleaded, whether a § 851 information is filed — these are prosecutorial decisions, and they are frequently the subject of negotiation.

§ 851: the filing that makes a prior-conviction enhancement possible

The enhanced minimums in § 841(b) do not apply automatically. 21 U.S.C. § 851(a)(1) sets a procedural precondition, and it has a hard deadline:

“No person who stands convicted of an offense under this part shall be sentenced to increased punishment by reason of one or more prior convictions, unless before trial, or before entry of a plea of guilty, the United States attorney files an information with the court (and serves a copy of such information on the person or counsel for the person) stating in writing the previous convictions to be relied upon.”

Before trial, or before entry of a plea. After that point the government cannot file it. That timing makes the § 851 information one of the few genuinely negotiable items in a drug case with priors, and it makes the plea timeline consequential in a way defendants rarely appreciate.

The rest of § 851 sets out how a prior is contested:

• § 851(b): after conviction and before sentencing the court “shall … inquire of the person … whether he affirms or denies that he has been previously convicted as alleged in the information, and shall inform him that any challenge to a prior conviction which is not made before sentence is imposed may not thereafter be raised to attack the sentence.” Silence at that moment forfeits the challenge.
• § 851(c)(1): a defendant who denies an allegation or claims a prior is invalid “shall file a written response to the information,” and “[t]he court shall hold a hearing to determine any issues raised by the response which would except the person from increased punishment.” The hearing “shall be before the court without a jury and either party may introduce evidence,” and “[t]he person shall have the burden of proof by a preponderance of the evidence on any issue of fact raised by the response.”
• § 851(c)(2): a constitutional challenge to a prior must be set out “with particularity.”
• § 851(e): there is a five-year limit — no person “may challenge the validity of any prior conviction alleged under this section which occurred more than five years before the date of the information alleging such prior conviction.”

Applied Insight — Elizabeth Franklin-Best, Esq., Principal Attorney: In a drug case with a qualifying prior, the § 851 information is often worth more than every guideline argument in the case combined, and it is decided before the plea. The firm’s first question on a case like that is not what the guideline range is; it is whether an information has been filed, whether the prior actually meets the current statutory definition of a “serious drug felony,” and whether the government will agree not to file. Once the plea is entered, that conversation is over.

What the First Step Act of 2018 changed

The First Step Act of 2018, Pub. L. No. 115-391 (Dec. 21, 2018), made three changes that matter on this page.

Change	Before	After
§ 841 prior-conviction predicate	Any “prior conviction for a felony drug offense”	A prior conviction for a “serious drug felony or serious violent felony” — a narrower, defined category
§ 841(b)(1)(A) enhanced minimums	“not … less than 20 years” for one prior; “a mandatory term of life imprisonment without release” for two or more	15 years for one prior; 25 years for two or more
§ 924(c) “stacking”	Enhanced penalties could apply to a “second or subsequent conviction” charged in the same indictment, producing consecutive 25-year terms in a single case	§ 924(c)(1)(C) now applies only “[i]n the case of a violation of this subsection that occurs after a prior conviction under this subsection has become final”
§ 3553(f) safety valve	Narrow criminal-history criterion (no more than 1 criminal history point) and drug offenses only	Section 402 of the Act “expanded the safety valve provision at 18 U.S.C. 3553(f) in two ways,” extending it to maritime offenses under 46 U.S.C. §§ 70503 and 70506 and replacing the criminal-history criterion with the three-part test in § 3553(f)(1)

The § 924(c) stacking change is the one that most transformed federal firearms sentencing. Before it, a defendant charged with three § 924(c) counts in a single indictment could face 5 + 25 + 25 years consecutive, all before the underlying offenses were sentenced. The current text requires the prior § 924(c) conviction to have become final, which means the enhanced 25-year penalty cannot be generated inside a single prosecution.

Two important limits. The § 924(c) change is not fully retroactive — it does not reach sentences imposed before December 21, 2018 that remain in place, although Hewitt v. United States, 606 U.S. 419 (2025), holds that it does apply when a pre-Act sentence is vacated and the defendant is resentenced after the Act. And the safety-valve expansion was narrowed by the Supreme Court in 2024; see the next section and the safety valve federal sentencing page.

Alleyne: facts that raise a minimum are elements

Alleyne v. United States, 570 U.S. 99 (2013), held:

“Facts that increase the mandatory minimum sentence are therefore elements and must be submitted to the jury and found beyond a reasonable doubt.”

The Court overruled Harris v. United States, 536 U.S. 545 (2002), explaining: “Because there is no basis in principle or logic to distinguish facts that raise the maximum from those that increase the minimum, Harris was inconsistent with Apprendi. It is, accordingly, overruled.”

Two boundaries matter.

It does not reach the fact of a prior conviction. Alleyne expressly left the prior-conviction exception undisturbed, which is why a § 851 prior is found by the judge at a bench hearing rather than by a jury.

It does not reach judicial factfinding that only influences discretion. “Our ruling today does not mean that any fact that influences judicial discretion must be found by a jury. We have long recognized that broad sentencing discretion, informed by judicial factfinding, does not violate the Sixth Amendment.”

What Alleyne does mean in practice is that drug quantity triggering a § 841(b) minimum, and the brandishing or discharge findings that raise the § 924(c) minimum from five years to seven or ten, must be charged and either admitted or found by a jury beyond a reasonable doubt. They cannot be added by a probation officer at sentencing.

Erlinger: the newest limit on judicial factfinding

In June 2024 the Supreme Court extended Apprendi and Alleyne into a corner of the Armed Career Criminal Act that had been treated as a judge’s question for decades.

Section 924(e)(1) applies only where the three qualifying priors were “committed on occasions different from one another.” Courts had routinely resolved that question themselves, on the theory that it was part of finding the fact of a prior conviction. Erlinger v. United States, 602 U.S. 821 (2024), held that the Fifth and Sixth Amendments require a unanimous jury to make that determination beyond a reasonable doubt.

The Court’s reasoning restates the governing principle: “virtually ‘any fact’ that ‘increase[s] the prescribed range of penalties to which a criminal defendant is exposed’ must be resolved by a unanimous jury beyond a reasonable doubt (or freely admitted in a guilty plea).”

Two practical points follow.

The prior-conviction exception is narrow and getting narrower. Erlinger describes the exception permitting judges to find “the fact of a prior conviction” as a “narrow exception,” and confirms that a sentencing judge may consult the charging documents, plea agreements and colloquies identified in Shepard v. United States, 544 U.S. 13 (2005), only for “the ‘limited function’ of determining the fact of a prior conviction and the then-existing elements of that offense.” As the Court put it, quoting Mathis v. United States, 579 U.S. 500 (2016): “‘[N]o more is allowed.'”

The remedy is procedural, not automatic. The Court noted that “[t]ools such as bifurcation in any event exist to address the prejudicial effect evidence about a defendant’s past crimes can have on a jury,” and the concurrence observed that violations of the right “are subject to harmless error review.” An Erlinger error therefore has to be preserved and then litigated as prejudicial — see preserving error for appeal and, for people already sentenced, retroactive Supreme Court decisions.

What a mandatory minimum actually means in time served

Families ask this constantly, and it is worth answering carefully because the answer is neither “the whole number” nor “half of it.”

Good conduct time still applies. 18 U.S.C. § 3624(b)(1) provides that “a prisoner who is serving a term of imprisonment of more than 1 year other than a term of imprisonment for the duration of the prisoner’s life, may receive credit toward the service of the prisoner’s sentence of up to 54 days for each year of the prisoner’s sentence imposed by the court, subject to determination by the Bureau of Prisons that, during that year, the prisoner has displayed exemplary compliance with institutional disciplinary regulations.”

Three things follow from that text. The credit is calculated on the sentence imposed by the court, not on time actually served. It is up to 54 days per year, and it is forfeitable through discipline. And it does not apply to a life sentence or to a sentence of a year or less.

Federal parole does not exist. The Sentencing Reform Act of 1984 abolished it for offenses committed after November 1, 1987. There is no parole board to appeal to.

First Step Act earned time credits are a separate system with exclusions. Credits earned through programming under the First Step Act operate differently from good conduct time and carry a statutory list of disqualifying offenses of conviction, together with a risk-level requirement. A number of the offenses that carry mandatory minimums are on that list. Do not assume the two systems stack. See First Step Act time credits and federal prison early release.

Halfway house and home confinement are placement decisions, not sentence reductions. They affect where the last part of a sentence is served, not how long it is. See halfway houses and home confinement.

The honest summary: a mandatory minimum is close to the number it says, reduced by good conduct time if it is earned and not lost, and reduced further only through the three statutory doors below or through post-sentencing relief. Anyone promising more than that is not describing federal law.

The three doors below a mandatory minimum

This is the section to keep. There are three, they are not interchangeable, and two of them are not yours to open.

Door	Authority	Who opens it	What it requires	What it reaches
1. Safety valve	18 U.S.C. § 3553(f); U.S.S.G. § 5C1.2	The court, on its own findings — no government motion needed	All five criteria in § 3553(f)(1)–(5). Criterion (1) is the criminal-history test construed in Pulsifer; criterion (5) requires truthful disclosure to the government about your own offense conduct by the time of sentencing	Qualifying drug offenses under 21 U.S.C. §§ 841, 844, 846, 960, 963 and 46 U.S.C. §§ 70503, 70506. The court sentences “without regard to any statutory minimum” — subject to § 5C1.2(b)’s floor of “not … less than 24 to 30 months” where the statutory minimum was five years or more
2. § 3553(e) substantial-assistance motion	18 U.S.C. § 3553(e)	The government, and only the government	A motion by the government. The statute: “Upon motion of the Government, the court shall have the authority to impose a sentence below a level established by statute as a minimum sentence so as to reflect a defendant’s substantial assistance in the investigation or prosecution of another person who has committed an offense”	Any statutory minimum. A § 5K1.1 motion is not enough — see below
3. Executive clemency	U.S. Const. art. II, § 2	The President	A commutation petition. No court involvement, no legal entitlement, no deadline	Any sentence. See federal clemency

The distinction that costs people years: § 5K1.1 versus § 3553(e)

This is the most consequential technical point on the page, and it is missed on almost every competing page.

U.S.S.G. § 5K1.1 authorizes a sentence below the guideline range on a government motion for substantial assistance. It does not authorize a sentence below a statutory minimum.

Melendez v. United States, 518 U.S. 120 (1996), is directly on point:

“The issue here is whether a Government motion attesting to the defendant’s substantial assistance in a criminal investigation and requesting that the district court depart below the minimum of the applicable sentencing range under the Sentencing Guidelines also permits the district court to depart below any statutory minimum sentence. We hold that it does not”

And: “§ 3553(e) requires a Government motion requesting or authorizing the district court to ‘impose a sentence below a level established by statute as minimum sentence’ before the court may impose such a sentence.” The Court added that magic words are not required, but “the Government must in some way indicate its desire or consent that the court depart below the statutory minimum before the court may do so.”

Practical consequence. A cooperating defendant facing a ten-year minimum whose guideline range is below ten years gains nothing from a § 5K1.1 motion alone. The plea agreement and the motion have to reach § 3553(e) in terms. This is checked before signing, not afterwards. Full treatment at 5k1.1.

One further asymmetry worth knowing. After sentencing, a government motion under Fed. R. Crim. P. 35(b) carries its own express authority to go beneath a statutory floor: Rule 35(b)(4), “Below Statutory Minimum,” provides that “[w]hen acting under Rule 35(b), the court may reduce the sentence to a level below the minimum sentence established by statute.” Three related provisions, three different reaches. See rule 35 motion.

The safety valve after Pulsifer

The safety valve is the only door a court can open without the government, which makes it the most important of the three for most defendants. It is also narrower than it was.

Pulsifer v. United States, 601 U.S. 124 (2024) — Kagan, J., for a six-Justice majority, decided March 15, 2024 — construed § 3553(f)(1)’s criminal-history test. The opinion’s own concluding statement of the holding:

“A defendant is eligible for safety-valve relief only if he satisfies each of the paragraph’s three conditions. He cannot have more than four criminal- history points. He cannot have a prior three-point offense. And he cannot have a prior two-point violent offense.”

A defendant must have none of the three. Many pages published before 2024, and a surprising number published since, describe the opposite reading — under which a defendant was disqualified only if he had all three. That reading is wrong and has been since March 15, 2024. If you find a page saying otherwise, do not rely on it. The full five criteria, the Pulsifer analysis, and the disclosure requirement are at safety valve federal sentencing.

The fourth question nobody asks: does the minimum apply at all?

Before looking for a door under the floor, it is worth asking whether the floor is properly there. A mandatory minimum is triggered by a legal characterisation, and legal characterisations are litigable.

Is the prior actually a qualifying predicate? Since the First Step Act, § 841(b)’s enhancement requires a “serious drug felony or serious violent felony,” not merely a “felony drug offense.” A prior that qualified under the old definition may not qualify under the new one. The same problem recurs under the Armed Career Criminal Act, where whether a state offense is a “violent felony” or a “serious drug offense” is the subject of a large and unstable body of Supreme Court and circuit law.

Were the ACCA priors committed on different occasions — and who decided? After Erlinger, that is a jury question.

Was the firearm possessed “in furtherance of” the offense? Section 924(c)(1)(A) reaches a person who “uses or carries a firearm” during and in relation to the predicate crime, “or who, in furtherance of any such crime, possesses a firearm.” Those are different standards, and the second requires a nexus between the weapon and the offense that mere presence does not supply.

Is the predicate a “crime of violence”? The § 924(c) predicate definition has been repeatedly narrowed by the Supreme Court, and a § 924(c) count resting on an offense that no longer qualifies is not merely a sentencing problem — it is a conviction problem, and one that can sometimes be raised after the fact. See retroactive Supreme Court decisions and grounds for a 2255 motion.

Was the quantity properly attributed? Section 841(b)’s thresholds attach to the quantity found, and after Alleyne the quantity that raises the minimum must be charged and admitted or found by a jury. A quantity established only by a probation officer’s calculation at sentencing cannot raise a statutory minimum, whatever it does to the guideline range.

These are questions for counsel with the indictment, the plea agreement and the discovery. They are also the questions most likely to be worth more than every other argument in the case.

What does not get you below a mandatory minimum

• A guideline argument. Acceptance of responsibility, a role reduction, the zero-point offender adjustment, and a corrected drug quantity all move the guideline range. None moves a statutory floor.
• A § 3553(a) variance. The parsimony clause governs the choice of sentence within lawful authority; it does not confer authority the statute withholds.
• Sympathy, however well documented. Health, age, family circumstances, and rehabilitation are powerful arguments in a case without a floor. Against a floor they are arguments for clemency, or arguments about which count to plead to.
• A § 5K1.1 motion standing alone. Melendez, above.
• A § 3582(c)(2) retroactive-amendment motion, where the sentence rested on the minimum. Koons v. United States, 584 U.S. 700 (2018).
• Cooperating without a written commitment. Under Wade v. United States, 504 U.S. 181 (1992), § 3553(e) and § 5K1.1 give the government “a power, not a duty,” and a claim that a defendant “merely provided substantial assistance will not entitle a defendant to a remedy or even to discovery or an evidentiary hearing.”

Applied Insight — Christopher Zoukis, JD, MBA, Managing Director: A statutory minimum also changes what happens inside the Bureau of Prisons. A defendant convicted of certain offenses may be ineligible to earn First Step Act time credits at all, and offense-of-conviction data drives PATTERN scoring and program eligibility. Families often assume that “good time” and programming will reduce a mandatory minimum meaningfully. Good conduct time under 18 U.S.C. § 3624(b) applies, but the exclusions matter, and they should be understood at sentencing rather than discovered in custody. See First Step Act time credits.

Where this leads next on minimum-sentence exits

• The exit a court can grant on its own: safety valve federal sentencing
• The exit that requires the government: 5k1.1
• The post-sentencing exit that reaches below a floor: rule 35 motion
• The role finding that can disqualify you from the safety valve: minor role reduction
• How the guideline range is built underneath all of this: federal sentencing guidelines
• The document where the quantity or the prior is first written down: presentence report
• The third door: federal clemency
• The full stage map: federal sentence mitigation attorney

Why work with Elizabeth Franklin-Best, P.C.

Elizabeth Franklin-Best, P.C. is a boutique federal criminal defense and appellate firm founded in 2019, practicing nationwide on an intentionally small caseload. Elizabeth Franklin-Best has more than twenty years of federal and appellate criminal defense experience, has handled more than 330 federal proceedings, over 100 of them appeals, with sixteen published decisions as counsel of record, and is admitted to the U.S. Supreme Court and twelve of the thirteen U.S. Courts of Appeals — every regional circuit (1st–11th) plus the D.C. Circuit. She is recognized by Best Lawyers in America 2026 for Appellate Practice and by Chambers USA 2026 for Litigation: White-Collar Crime & Government Investigations.

Christopher Zoukis, JD, MBA, the firm’s Managing Director, leads its federal prison consulting practice — Bureau of Prisons designation, sentence computation, First Step Act time credits, RDAP, and reentry planning — and is the author of the Federal Prison Handbook and four other books on the federal system.

Talk to a federal sentencing lawyer

If a charge in your case carries a statutory minimum, the questions that matter are specific and they are time-sensitive: has a § 851 information been filed, and can it be avoided? Is the safety valve realistically available after Pulsifer? Does the plea agreement reach § 3553(e), or only § 5K1.1? Is the attributed quantity supportable on the discovery?

Schedule a confidential consultation or call (843) 620-1100. Columbia office: 3710 Landmark Dr #113, Columbia, SC 29204; the firm also maintains an office in Mount Pleasant, South Carolina, and represents clients nationwide.

Frequently Asked Questions About Mandatory Minimums

Reviewed for legal accuracy by Elizabeth Franklin-Best, Esq., Principal Attorney·September 2026