PER CURIAM:

If a criminal defendant is sentenced to a term of imprisonment based on a provision of the United States Sentencing Guidelines (the "Guidelines") that is subsequently amended by the Sentencing Commission, a federal sentencing court may, in some circumstances, reduce the defendant's term of imprisonment based on the amended Guidelines provision. See 18 U.S.C. § 3582(c)(2). The question presented in this appeal is whether a sentencing court exercising this authority may give a defendant the additional benefit of a downward departure previously awarded in the original sentencing. We hold that the provisions of § 1B1.10 of the Guidelines, as incorporated by § 3582(c)(2), require a resentencing court to apply the amended Guidelines range that would have been applicable to the defendant under the retroactive amendment, without applying any previously-granted departure, except for a departure granted upon an appropriate motion by the government based on the defendant's substantial assistance to authorities. In other words, § 1B1.10 and § 3582(c)(2) together do not permit a resentencing court to downwardly depart from the amended Guidelines range, even if a downward departure was granted in the original sentencing, absent a government motion for a departure based on substantial assistance.

BACKGROUND

On December 11, 2006, a jury found defendant-appellant Terrence Steele guilty of (1) conspiring to possess with the intent to distribute, and to distribute, fifty grams or more of a mixture or substance containing cocaine base, in violation of 21 U.S.C. § 846; and (2) possessing with the intent to distribute fifty grams or more of a mixture or substance containing cocaine base, in violation of 21 U.S.C. § 841(a)(1), (b)(1)(A). At sentencing, the United States District Court for the District of Connecticut (Ellen Bree Burns, Judge) determined, as relevant here, that Steele's criminal history points and career offender designation corresponded to a criminal history category of VI. In his sentencing memorandum, however, Steele argued that this designation overstated his criminal history. The Court agreed to downwardly depart from this criminal history category and sentenced Steele based on a criminal history category of V. Following an initial appeal not relevant here, the District Court resentenced Steele, after downwardly departing to a criminal history category of V, to 151 months' imprisonment, and that sentence was affirmed on Steele's second appeal.1

After Steele's resentencing, the Sentencing Commission promulgated Amendment 750, which retroactively lowered the base offense levels for crack-cocaine offenses pursuant to the Fair Sentencing Act of 2010, Pub.L. No. 111-220, 124 Stat. 2372 (2010). Steele then moved in the District Court for yet another reduction in his sentence based on retroactive application of the new crack-cocaine sentencing rules in § 2D1.1 of the Guidelines. See U.S. Sentencing Guidelines Manual ("U.S.S.G.") § 1B1.10(c) (2012) (making retroactive the relevant part of Amendment 750). The government agreed that Steele was eligible for resentencing, see id. § 1B1.10(a), and should be resentenced based on a lower offense level. However, the government argued that the District Court must apply the sentencing range that would apply without departing from Steele's original criminal history category of VI, as it had done previously.

The District Court agreed with the government and therefore resentenced Steele based on a pre-departure Guidelines range of 140 to 175 months' imprisonment. The Court lowered Steele's prison sentence from 151 months to 140 months. See note 1, ante. Steele then brought the instant appeal (his third), arguing that the District Court miscalculated the relevant Guidelines range by not lowering his criminal history category from VI to V, as it had in the earlier sentencings.

DISCUSSION

Having reviewed de novo the legal questions presented in this appeal, see United States v. Williams, 551 F.3d 182, 185 (2d Cir.2009), we hold that the provisions of § 1B1.10 of the Guidelines, as incorporated by § 3582(c)(2), require a resentencing court to apply the amended Guidelines range that would have been applicable to a defendant, without applying any departures other than one granted upon appropriate motion by the government based on a defendant's substantial assistance.

Our holding follows from the plain language of 18 U.S.C. § 3582(c)(2) and the relevant provisions of the Guidelines. Section 3582(c)(2) provides statutory authority for limited resentencing proceedings:

18 U.S.C. § 3582(c)(2) (emphasis added). This rule — namely, that resentencings pursuant to § 3582(c)(2) must be consistent with the applicable Guidelines policy statement — is mandatory. Accordingly, § 3582(c)(2) does not authorize "a plenary resentencing proceeding," Dillon v. United States, ___ U.S. ___, 130 S.Ct. 2683, 2691, 177 L.Ed.2d 271 (2010), and the resentencing court must treat the Guidelines as binding — not as "advisory" as it would at a defendant's initial sentencing, id. at 2691-93 (holding that the constitutional rule of United States v. Booker, 543 U.S. 220, 125 S.Ct. 738, 160 L.Ed.2d 621 (2005) does not apply to resentencing).

According to the relevant policy statement issued by the Sentencing Commission, in setting a reduced sentence, a resentencing court must first "determine the amended guideline range that would have been applicable to the defendant if the amendment(s) to the guidelines ... had been in effect at the time the defendant was sentenced." U.S.S.G. § 1B1.10(b)(1). Amendment 759 to the Sentencing Guidelines, which became effective November 1, 2011, amended the advisory notes to § 1B1.10 to specify that this "applicable" Guidelines range "corresponds to the offense level and criminal history category determined pursuant to § 1B1.1(a), which is determined before consideration of any departure provision in the Guidelines Manual or any variance." U.S.S.G. § 1B1.10 cmt. n. 1(A) (emphasis added); see Stinson v. United States, 508 U.S. 36, 38, 113 S.Ct. 1913, 123 L.Ed.2d 598 (1993) ("[C]ommentary in the Guidelines Manual that interprets or explains a guideline is authoritative unless it violates the Constitution or a federal statute, or is inconsistent with, or a plainly erroneous reading of, that guideline."). The "applicable" amended Guidelines range under § 1B1.10(b)(1) therefore does not incorporate any Guidelines "departures."2 See U.S.S.G. § 1B1.1 cmt. n. 1 (E) (defining "departure" as "imposition of a sentence outside the applicable guideline range or of a sentence that is otherwise different from the guideline sentence," or, for purposes of criminal-history departures under § 4A1.3, "assignment of a criminal history category other than the otherwise applicable criminal history category, in order to effect a sentence outside the applicable guideline range").

Having determined the applicable amended Guideline range, a district court may resentence a defendant within that range, but "the court shall not reduce the defendant's term of imprisonment ... to a term that is less than the minimum of the amended guideline range" for any reason other than the defendant's substantial assistance to the government. Id. § 1B1.10(b)(2). In other words, on resentencing pursuant to 18 U.S.C. § 3582(c), a defendant's reduced sentence generally may not fall below the pre-departure Guidelines range that would have been "applicable" to him had he been sentenced after the relevant amendment to the Guidelines, with an exception only for a departure based on a defendant's substantial assistance.3 See, e.g., United States v. Berberena, 694 F.3d 514, 518-19 (3d Cir. 2012) ("[The policy statement] prohibits a reduction below the low end of a prisoner's new range, even if the prisoner originally received a below-Guidelines sentence. The only exception is for defendants whose below-Guidelines sentences were based on a government motion to reflect the defendant's substantial assistance to authorities." (internal quotation marks omitted)); United States v. Valdez, 492 Fed.Appx. 895, 900 (10th Cir.2012) (unpublished and nonprecedential decision) ("[I]t is clear as a matter of law that the district court correctly held that, except for a reduction for substantial assistance, it lacked the authority to depart further from the amended Guideline on the ground that Valdez had received a criminal history category reduction in his original sentencing proceeding.").

The Guidelines Manual Application Notes, as amended November 1, 2011, illustrate this rule by hypothetical, using the example of a defendant whose applicable Guidelines range at the time of sentencing was 70 to 87 months' imprisonment and whose applicable amended Guidelines range is 51 to 63 months' imprisonment. U.S.S.G. § 1B1.10 cmt. n. 3. In such a case, "if the term of imprisonment imposed... was not a sentence of 70 months (within the guidelines range) but instead was a sentence of 56 months (constituting a downward departure or variance), the court ... may reduce the defendant's term of imprisonment, but shall not reduce it to a term less than 51 months." Id. Accordingly, the District Court correctly determined that it lacked the authority to further reduce Steele's sentence based on its previously-awarded downward departure, which reduced his criminal history category from VI to V.

We are mindful that our decision today departs from the understanding of § 1B1.10 that we articulated in United States v. Rivera, 662 F.3d 166 (2d Cir. 2011). In that case, we explained that "the `guideline range applicable to the defendant' within the meaning of § 1B1.10 is the range that was actually used in sentencing the defendant," id. at 181 (quoting U.S.S.G. § 1B1.10). After that case was decided, however, the Sentencing Commission amended the Guidelines to specify, as noted above, that the "applicable Guidelines range" refers to "the guideline range that corresponds to the offense level and criminal history category determined pursuant to § 1B1.1(a), which is determined before consideration of any departure provision in the Guidelines Manual or any variance." U.S.S.G. § 1B1.10 cmt. n. 1(A) (emphasis added). Our decision in Rivera specifically acknowledged that this Guidelines amendment — which had been proposed pursuant to 28 U.S.C. § 994(u),4 but had not yet been enacted — would "prescribe the precise construction of `applicable guideline range' that we refuse to give the existing guideline, i.e., it is the pre-departure range from the initial sentencing." Rivera, 662 F.3d at 183. In other words, Rivera recognized that its holding was limited and that it would not apply to cases where, as here, a defendant petitions for relief under § 3582(c)(2) after the 2011 amendments to § 1B1.10 became effective.5

CONCLUSION

To summarize:

The amended judgment of the District Court is AFFIRMED.