If your charge carries a mandatory minimum, one number shapes everything else in the case. The federal sentencing process normally works in two steps: the judge calculates a guideline range, then weighs the factors in 18 U.S.C. section 3553(a) to pick a sentence that is sufficient but not greater than necessary. A mandatory minimum cuts across that sequence. It is a floor fixed by statute, and the judge cannot sentence below it no matter how sympathetic the broader factors look, unless one of two specific legal doors opens at sentencing. Understanding the floor, the doors, and what can still be disputed is the starting point for every decision that follows.
A floor set by Congress, not by the judge
Congress writes some criminal statutes with a lowest allowed sentence built in. The guideline range still gets calculated, but it cannot pull the sentence under the floor. The Guidelines Manual states the rule for the common situation this way: where the minimum sits above the top of the range, "the statutorily required minimum sentence shall be the guideline sentence." The Manual gives the arithmetic plainly. A range of 41 to 51 months paired with a required minimum of 60 months produces a guideline sentence of 60 months. The range did its work and the floor still won.
That is why a minimum changes plea discussions, trial decisions, and sentencing preparation all at once. It does not only raise the worst case. It removes the bottom of the range that the defense would otherwise argue for. And not every federal charge has one. Many fraud, theft, and conspiracy charges carry only a maximum, which leaves the judge free to impose anything from probation up to that ceiling. When no minimum is charged, the guideline range and the section 3553(a) factors do the real work. When one is charged, counsel builds the whole strategy around the floor.
Where minimums appear most: drug weight
Drug cases produce more mandatory minimums than any other kind of federal case. The ladder sits in 21 U.S.C. section 841(b), and the rung turns on the type and weight of the drug. At the top tier, section 841(b)(1)(A), the sentence "may not be less than 10 years or more than life." The weights that trigger it include 1 kilogram or more of heroin, 5 kilograms or more of cocaine, 280 grams or more of crack cocaine, 50 grams or more of actual methamphetamine or 500 grams or more of methamphetamine mixture, 400 grams or more of fentanyl mixture, and 1,000 kilograms or 1,000 plants of marijuana. At the middle tier, section 841(b)(1)(B), the sentence "may not be less than 5 years and not more than 40 years," with thresholds exactly one tenth of the top tier for most drugs: 100 grams of heroin, 500 grams of cocaine, 28 grams of crack, 5 grams of actual methamphetamine or 50 grams of mixture, 40 grams of fentanyl mixture, and 100 kilograms or 100 plants of marijuana.
Two details in that list decide real cases. First, mixture and purity count differently. For methamphetamine the 10-year line is drawn at 50 grams of actual drug but 500 grams of mixture, so laboratory results can move a case from one tier to another. Second, the next tier down, section 841(b)(1)(C), carries up to 20 years with no minimum at all, or up to 30 years after a prior felony drug offense, unless death or serious bodily injury results, in which case the range becomes 20 years to life, or life after such a prior. A case charged one tier down can look entirely different from the tier above it, which is why the drug trafficking page should be read alongside this one whenever weight is in dispute.
Weight is not the only thing that lifts the drug floor. Prior convictions raise the floors in the top two tiers. At the top tier, a prior conviction for a serious drug felony or serious violent felony that has become final lifts the range to 15 years to life, and two or more such priors lift it to 25 years. Congress lowered these particular floors in 2018. The amendment notes show the one-prior floor moving from 20 years to 15, and the two-prior penalty moving from life imprisonment to 25 years. Where death or serious bodily injury results, the penalties climb further, reaching life imprisonment. Supervised release follows the prison term by law: at least 5 years at the top tier and at least 4 at the middle tier, rising to 10 and 8 years respectively where a prior conviction is involved. And the statute closes two exits people often ask about. For these tiers, "the court shall not place on probation or suspend the sentence," and no person sentenced under them "shall be eligible for parole during the term of imprisonment imposed therein."
The gun minimum runs on top
The second great source of minimums is the firearm count, 18 U.S.C. section 924(c). It punishes anyone who uses or carries a firearm during and in relation to a federal violent crime or drug trafficking crime, or who possesses one in furtherance of such a crime, and the punishment lands "in addition to the punishment provided for such crime of violence or drug trafficking crime." That phrase is the whole point. The gun years stack on top of the drug or violence years. They do not merge into them.
The ladder has three rungs for ordinary firearms: a minimum of 5 years for using, carrying, or possessing; 7 years "if the firearm is brandished"; and 10 years "if the firearm is discharged." The law defines brandishing in practical terms: "to display all or part of the firearm, or otherwise make the presence of the firearm known to another person, in order to intimidate that person, regardless of whether the firearm is directly visible to that person." Showing the gun to threaten someone counts even if it stays hidden. Certain weapons start higher. A short-barreled rifle, short-barreled shotgun, or semiautomatic assault weapon carries a 10-year minimum, while a machinegun, a destructive device, or a gun with a silencer carries 30 years. A violation that "occurs after a prior conviction under this subsection has become final" draws 25 years, or life where the gun is a machinegun, a destructive device, or silencer equipped.
Three more rules make this count unusually severe. First, the time must run consecutively. The statute provides that "no term of imprisonment imposed on a person under this subsection shall run concurrently with any other term of imprisonment imposed on the person, including any term of imprisonment imposed for the crime of violence or drug trafficking crime during which the firearm was used, carried, or possessed." Second, "a court shall not place on probation any person convicted of a violation of this subsection." Third, the guideline treatment is mechanical. Under USSG section 2K2.4, for a section 924(c) conviction "the guideline sentence is the minimum term of imprisonment required by statute," and the adjustment and criminal history chapters do not apply to that count. The guideline does not soften the gun count. It repeats the statute. The details of how this charge is proved and defended are covered on the firearm in furtherance page.
How the floor meets the guideline range
Putting the pieces together, the guideline calculation and the statutory floor interact in only a few ways. If the range sits entirely above the minimum, the minimum rarely matters, because the sentence will land inside the range anyway. If the range sits entirely below the minimum, the minimum replaces the range as the guideline sentence. If they overlap, the bottom of the range is cut off at the floor. Either way, the sentence must stay at or above the minimum and at or below the statutory maximum.
Multiple counts follow their own rule. The Manual provides that a count whose statute both specifies a prison term and requires it to run consecutively "shall be determined by that statute and imposed independently." That is the section 924(c) situation: the gun count is scored by its statute and stacked onto whatever the other counts produce. The sentencing calculator shows how a guideline range is built for one fraud guideline, which helps to see the arithmetic, but it does not model minimums or consecutive gun counts, so its output never answers what the floor requires.
The first way below the floor: a cooperation motion
Congress created two exits from a minimum at sentencing, and the first belongs to the government. The statute says: "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." Three features of that sentence matter. The motion comes from the government, not from the defense and not from the judge. What earns it is substantial help against someone else, meaning information or testimony used to investigate or prosecute another person. And the authority it unlocks is the power to go below the floor, with the judge then deciding how far below.
This is the hardest decision many defendants face, because the help must be real and it usually cannot wait. Assistance that arrives after sentencing needs a different mechanism, the post-sentencing motion covered on the Rule 35 page. Counsel's job here is blunt advice given early: whether the person actually has anything the government wants, what telling it would cost in safety and in admissions to other conduct, and whether the likely reduction justifies the price. No one can promise a motion will be filed. The government decides, and the judge decides the size of any break.
The second way below the floor: the safety valve
The second exit belongs to the court and needs no government motion. For certain drug and related offenses, the statute directs that "the court shall impose a sentence pursuant to guidelines promulgated by the United States Sentencing Commission under section 994 of title 28 without regard to any statutory minimum sentence," if the court finds five things at sentencing after giving the government a chance to be heard. The five tests, tracked from the statute and the matching guideline at USSG section 5C1.2, are these. The defendant must have a limited record: no more than 4 criminal history points excluding 1-point offenses, no prior 3-point offense, and no prior 2-point violent offense. The defendant must not have used violence or threats, possessed a gun or other dangerous weapon, or talked someone else into doing so, in connection with the offense. The offense must not have caused death or serious bodily injury. The defendant must not have led, managed, or supervised others and must not have been part of a continuing criminal enterprise. And no later than the sentencing hearing, the defendant must have told the government everything known about the offense and any connected conduct.
That last requirement, the truthful proffer, is where cases are won and lost. The law is forgiving about value: having nothing useful to offer, or offering facts the government already knows, does not by itself fail the test. It is unforgiving about honesty and completeness. Holding back one fact can sink the whole application. Congress balanced that demand with a protection worth knowing. Information a defendant reveals to qualify "may not be used to enhance the sentence of the defendant unless the information relates to a violent offense." The full criteria and the preparation of a proffer are covered on the safety valve page, which should be read next whenever a drug minimum is charged.
Old convictions can raise the floor, but the government must give notice
A prior record does more than add criminal history points. Under the drug penalties it can lift the minimum itself, from 10 years to 15 or 25 at the top tier, or from 5 years to 10 at the middle tier. Because the stakes are that high, the law builds in a notice procedure with teeth. For drug offenses, "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" listing the convictions relied upon, with a copy served on the person or counsel.
What happens next is a short ritual with real content. After conviction but before sentencing, the court must ask whether the person admits or denies the priors and must warn that any challenge not made before sentencing may be lost for good. A denial or a claim that a conviction is invalid must be put in a written response, and "The court shall hold a hearing to determine any issues raised by the response." That hearing is before the judge without a jury, the government generally must prove disputed facts beyond a reasonable doubt, and either side may call for written findings. One limit runs the other way. A conviction that occurred more than five years before the information generally cannot be attacked through this procedure. In practice counsel tests every link: was the information filed and served on time, does the old conviction actually fit the qualifying category the penalty tier requires, and is there a live challenge to raise before the deadline passes. An enhancement the government never properly notices cannot apply.
How counsel fights a minimum before sentencing
With the floor understood, the work turns practical. Each of these lines of defense is litigated on the facts of the case, and none succeeds by itself in every case.
Weight and attribution come first in drug cases. The tier turns on the quantity the government can attribute to the person, and mixture against purity, laboratory analysis, and the scope of jointly undertaken conduct all get examined. A few grams at a threshold line can mean the difference between 5 years and 10, or between a minimum and none. Second, the gun facts get tested. Whether a firearm was possessed in furtherance of the crime, whether it was brandished or discharged, and what kind of weapon it was each move the number, and each must be proved. Third, the prior convictions get challenged through the notice procedure described above, on timeliness, on qualification, and on validity where the law allows. Fourth, the safety valve gets pursued early. Because the proffer must be complete by the sentencing hearing and the history, violence, weapon, injury, and role tests all turn on conduct from the start, counsel prepares for qualification from the first meeting rather than discovering a problem the week before sentencing. Fifth, cooperation gets an honest evaluation against the safety valve alternative. Where the person qualifies for the valve, cooperation may add little. Where the valve is out of reach, cooperation may be the only door at sentencing, and its timing and completeness decide its worth. The presentence report carries the probation officer's version of weight, role, history, and valve eligibility to the judge, so every one of these disputes should be raised as a written objection on time rather than left for argument at the hearing.
What these numbers mean, and what they do not
Every penalty figure on this page is a statutory maximum or minimum or a guideline sentence, never a prediction. A top-tier drug count may carry 10 years to life by statute while the real fight is over which tier the facts support, whether a prior was properly noticed, and whether a door below the floor stands open. A gun count adds consecutive years that no guideline adjustment softens. The facts of a case change everything: weight, purity, the gun's role, the record, honesty at the proffer, and help offered to the government can move the outcome far from where the charge first seemed to point it. Sentencing advocacy then returns to the full picture described in the sentencing overview, where the section 3553(a) factors shape everything the floor leaves open.