Skоshi Thedford Farr appeals her conviction for tax fraud. She alleges that during trial the government constructively amended the indictment against her — trying her not just for the crime described in the indictment but also for a separate and additional offense. We agree. The grand jury indicted Ms. Farr for one crime (failure to pay quarterly employment taxes for a medical clinic) but at trial the government pursued her for another offense (failure to pay a trust fund recovery penalty assessed against her personally). Under the Constitution, the government may only proceed at trial against the accused “for ... [an] infamous crime ... on presentment or indictment of a Grand Jury.” U.S. Const, amend. V. At the same time, we cannot agree with Ms. Farr’s additional argument that there exists insufficient evidence in this record to sustain her conviction and thus that she cannot be subjected tо retrial under a lawful indictment. Accordingly, we reverse but leave open the possibility of a new trial under a new indictment.
I
A
The Internal Revenue Code (“Code”) requires “employer[s]” to deduct from their employees’ wages the employees’ share of FICA and individual income taxes.
See
26 U.S.C. § 3102(a), 3402(a). The employer is liable for the withheld portion of the employees’ payroll taxes and must pay over the full amount to the government each quarter. 26 U.S.C. § 3403.
1
These withheld amounts are considered to be held in a “special fund in trust for the United States” after collection each pay period until they are remitted to the government. 26 U.S.C. § 7501;
see Slodov v. United States,
From 1984 through 1999, Ms. Farr servеd as the general manager or administrator of her husband’s alternative medicine clinic in Oklahoma City, which he operated from 1978 until his death in De *1177 cember 1998. Apparently to avoid Internal Revenue Service (“IRS”) scrutiny and collection efforts, the clinic used several names and associated tax identification numbers over the years, operating variously as “Genesis Medical Center,” “Crossroads Unlimited Trust,” and “ATHA-Gen-esis.” Throughout its years of operation, the clinic filed quarterly federal tax returns (IRS Form 941) reporting wages paid and federal taxes withheld for employees, but failed conspicuously to pay those withheld quarterly employment taxes over to the federal government. The clinic’s ever-changing name and tax identification number aided its efforts to avoid detection, making it difficult for IRS revenue officers to locate assets for the collection of the delinquent employment taxes.
The IRS is, of course, hardly without recourse in such circumstances. The Code provides a broad array of tools for the IRS to collect the withheld employment taxes from employers who neglect to pay as required by Section 3403.
See Slodov,
When Ms. Farr did not pay the penalty assessed against her, a civil proceeding evolved into a criminal one. The government sought and received an indictment in August 2006 against Ms. Farr. Specifically, the grand jury charged Ms. Farr under 26 U.S.C. § 7201, a generic tax evasion provision providing that
[a]ny person who willfully attempts in any manner to evade or defeat any tax imposed by this title or the payment thereof shall, in addition to other penalties provided by law, be guilty of a felony аnd, upon conviction thereof, shall be fined not more than $100,000 ($500,000 in the case of a corporation), or imprisoned not more than 5 years, or both, together with the costs of prosecution.
Significantly for our purposes, however, the government chose in this case not to seek a broad indictment simply reciting the generic language of Section 7201, but instead deliberately added additional detail to its charge. As adopted by the grand jury, the indictment alleged, in pertinent measure,
[t]hat beginning on or about the 12th day of November, 2001, and continuing until the present, in the Western District of Oklahoma and elsewhere, SKO-SHI THEDFORD FARR, the defendant *1178 herein, a resident of Oklahoma City, Oklahoma, and Grants Pass, Oregon, did ■willfully attempt to evade and defeat the payment of the quarterly employment tax for ATHA-Genesis Chapter due and owing by her to the United States of America for the quarters 6-99, 9-99, аnd 12-99 in the amount of $72,076.21 by concealing and attempting to conceal from the Internal Revenue Service the nature and extent of her assets and the location thereof and placing funds and property in the names of nominees. All in violation of Title 26, United States Code, Section 7201.
ApltApp. # 2 at 2-3 (emphasis added). 3
B
At trial, Ms. Farr’s counsel repeatedly called attention to the fact that the grand jury’s indictment charged her with evading payment of the “quarterly employment tax for [the clinic] due and owing by her.” Counsel urged that an acquittal was required because, under Section 3403, quarterly employment taxes are the sole responsibility of the “employer,” specifically identified in the indictment as the ATHA-Genesis Clinic. Counsel noted that Ms. Farr was not the “employer” and quarterly employment taxes thus were not and could never have been, as alleged, “due and owing from her.” Rather, counsel argued, Ms. Farr was only ever personally assessed, and failed to pay, a “trust fund recovery penalty” under Section 6672, a matter that counsel argued was not encompassed within the indictment. Counsel introduced this theory to the jury as early as his opening statement:
The evidence will be that she hasn’t been indicted for failure to pay, the testimony of witnesses will be trust fund recovery penalty assessments, but quarterly employment taxes. And I submit to you that the witnesses in this case will testify that she did not evade the payment of these quarterly employment taxes for Crossroads [or] ATHA-Gene-sis, as alleged by the government.
Aplt.App. # 6.
As counsel predicted, the government pursued at trial the theory that Ms. Farr should be found guilty by virtue of her failure to pay the trust fund recovery penalty assessed against her personally. Indeed, the government’s first witness, IRS officer Mr. Ambuehl, testified that the IRS had assessed the Seсtion 6672 trust fund recovery penalty against Ms. Farr for the clinic’s failure to pay its quarterly employment taxes, and that she had not paid the outstanding penalty. On cross examination, Ms. Farr’s counsel elicited testimony from Mr. Ambuehl that the “quarterly employment taxes” charged in the indictment were the responsibility solely of the clinic as the “employer”; that Ms. Farr was never the employer; that the unpaid quarterly employment taxes were not her taxes, but those of the clinic; that Ms. Farr’s failure to pay the trust fund recovery penalty when it was assessed against her was not charged in the indictment; and that quarterly employment taxes and trust fund recovery penalties are separate liabilities, due from different parties. Aplt-App. # 7.
This (promising for the defense) line of questioning continued throughout trial. Eventually, the district court intervened to address “the issue raised by the indictment.” Aрlt-App. # 11 at 112-13. Noting that the government had “four years [prior to trial] to get it right in the indictment,” the district court expressed concern that *1179 the indictment was legally deficient by charging Ms. Farr for a crime that its own witnesses suggested only the clinic could commit. ApltApp. # 16. After contemplating a motion for judgment of acquittal, however, the court eventually sought to save the trial by preparing a jury instruction requiring the jury to treat the trust fund recovery penalty discussed at trial and the quarterly employment tax referenced in the indictment as interchangeable terms:
You are instructed that, as a matter of law, for all purposes relevant to this case, the Trust Fund Recovery Penalty assessed against the defendant is to be treated as the equivalent of the quarterly employment tax referred to in Count 1 and Count 2 of the indictment.
ApltApp. at 7. The court acknowledged, with somе regret, that its jury instruction “forecloses [closing] argument that the defendant did not evade the quarterly employment tax because all she was ever assessed for was the trust fund recovery penalty,” and “cuts ... clean off’ Ms. Farr’s primary trial defense based on the language of the indictment. ApltApp. # 11 at 115, 114. The court went on to state that “it rankles me to be having to scab over this problem [that] could so easily have been avoided.... [B]y giving this instruction, I’m pulling the case out of the ditch for the government, and as I said, it rankles me to have to be doing that.” Id. ApltApp. #11 at 113, 115. Ultimately, the jury convicted Ms. Farr, and the district court sentenced her to thirty months in prison, three years of supervised release, and $72,076.21 in restitution, but suspended the sentence pending this appeal.
II
On appeal, Ms. Farr first asserts that the government’s evidence at trial and the contested jury instruction construсtively amended the indictment against her by allowing the jury to convict her for failing to pay the trust fund recovery penalty rather than evading the quarterly employment taxes of ATHA-Genesis, as alleged in the indictment. We review
de novo
the question whether the district court proceedings constructively amended the indictment,
United States v. Bishop,
A
It is axiomatic in our legal system that “a court cannot permit a defendant to be tried on charges that are not made in the indictment against him.”
Stirone v. United States,
[i]f it lies within the province of a court to change the charging part of an indictment to suit its own notions of what it ought to have been, or what the grand jury would probably have made it if their attention had been called to suggested changes, the great importance which the common law attaches to an indictment by a grand jury, as a prerequisite to a prisoner’s trial for a crime, and without which the constitution says *1180 ‘no person shall be held to answer,’ maybe frittered away until its value is almost destroyed....
... Any other doctrine would place the rights of the citizen, which were intended to be protected by the constitutional provision, at the mercy or control of the court or prosecuting attorney; for, if it be once held that changes can be made by the consent or the order of the court in the body of the indictment as presented by the grand jury, and the prisoner can be called upon to answer to the indictment as thus changed, the restriction which the constitution places upon the power of the court, in regard to the prerequisite of an indictment, in reality no longer exists.
Ex parte Bain,
These observations remain no less binding upon us today. Accordingly, “after an indictment has been returned its charges may not be broadened through amendment except by the grand jury itself.” Stirone,
B
Measuring against this standard, we are persuaded that the trial proceedings in this case effected a constructive amendment of the indictment against Ms. Farr. The indictment chargеd Ms. Farr with willfully attempting “to evade and defeat the payment of the quarterly employment tax for ATHA-Genesis Chapter due and owing by her.” But a potentially fatal incongruity soon emerged at trial: the government’s own witnesses indicated that quarterly employment taxes are only ever due from an employer, conceded that Ms. Farr was not the employer in this case, and admitted that she never owed quarterly employment taxes for the clinic. In the face of this, the government sought to proceed against Ms. Farr for her failure to pay the trust fund recovery penalty subsequently assessed against her personally by the IRS under Section 6672. The district court understandably sought to save the trial it had begun and agreed to give the contested jury instruction. But that instruction, by dictating to the jury that the trust fund recovery penalty and the quarterly employment taxes are the *1181 same thing, effеctively allowed the jury to convict Ms. Farr for failing to pay either the clinic’s quarterly employment taxes purportedly “due and owing by her” or the trust fund recovery penalty assessed personally against her. That is, the district court essentially allowed the jury to consider two possible bases for conviction— the flawed one outlined in the indictment and another more accurate one added at trial.
Had the government simply charged Ms. Farr generically under Section 7201 with the willful evasion of a tax, we might have a different situation. But it did not. Instead, the government opted to include in its indictment particulars about the nature of the tax at issue, specifically charging her with evading the “quarterly employment tax for ATHA-Genesis Chapter due and owing by her.” It is settled law in this circuit, as elsewhere, that the language employed by the government in its indictments becomes an essential and dеlimiting part of the charge itself, such that “[i]f an indictment charges particulars, the jury instructions and evidence introduced at trial must comport with those particulars.”
Bishop,
To be sure, the government submits that a constructive amendment did not occur because the employment tax and the trust fund recovery penalty are proverbial alter egos — different words meaning the same thing. And the government is also surely correct that not every minor variance between the facts as presented at trial and those alleged in the indictment amounts to an unconstitutional constructive amendment.
See Sells,
The difficulty for the government in this particular case is that the difference between the quarterly employment taxes and the trust fund recovery penalty is not merely a semantic one under our precedent. We have previously held that the trust fund recovery “penalty is distinct from and in addition to the employer’s liability for [the employment] taxes,”
Bradshaw,
In reaching the conclusion that the government at trial effected an impermissible constructive amendment of the indictment, we note that we have no occasion to pass on the additional — and purely hypothetical — question whether the government could have proceeded against Ms. Farr under Section 7201 on the theory that, while the clinic, not she, was the employer, she willfully attempted to “defeat” payment of the clinic’s Section 3403 quarterly employment taxes. That is a course the government did not pursue at trial or on appeal before us (neither is it clear whether the government could have pursued such a course under the terms of its indictment in this case: again, the indictment alleged, paradoxically in light of its own witnesses’ testimony that the clinic was the employer responsible for payment of quarterly taxes, that quarterly employment taxes “were due and owing by her [i.e., Ms. Farr]”). Likewise, we have no reason to pass on the parties’ pаssing and undeveloped dispute whether Section 7201, rather than Section 7202, is an appropriate vehicle for prosecuting evasion of the Section 6672 trust fund recovery penalty. 5 Instead, we limit our analysis and holding today to the question whether a constructive amendment of the indictment occurred when the government proceeded against Ms. Farr for nonpayment of the trust fund recovery penalty in the face of an indictment that never referenced such a liability.
On this dispositive score, our case is very much like
Stirone.
There, the indictment charged the defendant with unlawfully obstructing or affecting interstate commerce — specifically, the importation of sand for the manufacture of cement — by extortion and threats in violation of the Hobbs Act.
Stirone,
C
The government responds that Ms. Farr cannot credibly claim to have suffered from a prejudicial lack of notice about the government’s intentions. In doing so, the government rightly observes that Ms. Farr had been assessed the trust fund recovery penalty on the date cited in the indictment in an amount corresponding exactly to the amounts cited in the indictment. Even so, the question of a prejudicial lack of notice is not so clear cut. As defense counsel stresses, his primary trial tactic (suggesting that the clinic, not Ms. Farr, was the employer responsible and assessed for paying quarterly employment taxes) was stripped from him very near the end of trial, after he had devoted considerable time to its presentation and development in his opening statement and witness examinations before the jury. As the district court acknowledged, it is “not an unfair characterization of the situation” to say that counsel was “denied ... the right to present the defense based on the indictment [the government] g[ave]” him, and which he pursued through much of trial. Aplt.App. # 11 at 114,115.
More fundamentally still, the prohibition on constructive amendments is grounded not just in the Sixth Amendment’s notice requirement but also in the grand jury guarantee of thе Fifth Amendment. “As the dual source of the rule makes clear, it protects
both
a defendant’s right to be subjected only to charges set by a grand jury and his interests in having sufficient notice.”
United States v. Gonzalez-Edeza,
Separately, the government defends its expansion of the indictment on the basis of an unreported district court case which it reads as holding the trust fund recovery penalty “interchangeable” with the quarterly employment taxes,
United States v. Scotto,
On or about December 23, 1991, the IRS assessed SCOTTO personally, as a “person required to collect, truthfully account for, and pay over any tax imposed” by the Internal Review Code, 26 U.S.C. § 6672(a), approximately $32,428.98 for unpaid payroll taxes withheld from employees of Waterset, an amount known as a Trust Fund Recovery Penalty.... SCOTTO has evaded payment of Trust Fund Recovery Penaltiеs totaling approximately $49,663.24 for payroll taxes withheld from employees of Waterset and R3A6 for payment on their behalf to the IRS.
Id. at *5-6. In analyzing this language, the district court observed in the course of denying Mr. Scotto’s motion to dismiss the indictment that “[t]he Indictment explains that Scotto, pursuant to 26 U.S.C. § 6672(a), is a person responsible for the unpaid payroll taxes of these two corporate entities.... Scotto is charged as a responsible person pursuant to Section 6672, not as an employer pursuant to Section 3403.” Id. at *3, 4.
The Scotto court did not purport to hold that the trust fund recovery penalty is, as a matter of law, always and everywhere a synonym for quarterly employment taxes. Rather, it only held that, as used in the peculiar indictment before it, the use of the term “payroll tax” was not fatal because the document defined that term by express referenсe to the trust fund recovery penalty: “the term ‘Trust Fund Recovery Penalty’ is interchangeable with the language ‘payroll tax’ charged in Count One of the Indictment and the Indictment is not facially insufficient for the *1186 Government’s failure to use the term ‘Trust Fund Recovery Penalty’ in [one charging paragraph], especially since the term was used, and defined, elsewhere in the Indictment.” Id. at *5. 8 We have no quarrel with any of this. Our difficulty lies simply in the fact that the indictment against Ms. Farr did nothing of this sort, making no reference whatsoever to the trust fund recovery penalty or Section 6672; neither did the government mention the penalty in its responsive pleadings in the district court, including its bill of particulars. While the language of Mr. Scot-to’s indictment left no doubt that the grand jury charged him with evading the trust fund recovery penalty and afforded him notice that he would be tried for the payroll taxes “as a responsible pеrson pursuant to Section 6672,” the same simply cannot be said of Ms. Farr’s indictment. And each indictment must be assessed on its own terms. 9
Ill
In addition to challenging the propriety of the charge she faced before the jury, Ms. Farr contends there was insufficient evidence to convict her of that charge. She presses this separate challenge surely well aware of the “venerable principle of double jeopardy jurisprudence,” that “[t]he successful appeal of a judgment of conviction, on any ground other than the insufficiency of the evidence to support the verdict, poses no bar to further prosecution on the same charge.”
United States v.
Scott,
A
We begin by noting that our ruling on the constructive amendment question does not speak to the question of evidentiary sufficiency, and thus does not implicate double jeopardy concerns. While a ruling that the evidence is insufficient to support a conviction is equivalent to a judgment of acquittal, and any retrial would thus unconstitutionally place the defendant in double jeopardy,
10
the government may retry a defendant whose conviction is set aside due to defects in the trial process.
See Burks v. United States,
The point of the double jeopardy clause is to prevent retrial on a charge of which the defendant has been effectively acquitted (and to prevent second punishment for a crime for which the defendant has already been punished, a problem happily not at issue here).
See Hall,
B
Turning directly to Ms. Farr’s sufficiency challenge, and thus whether a retrial would expose her to impermissible double jeopardy, we consider whether sufficient evidence was introduced at trial to support the verdict the jury rendered,
Scott,
Before us, Ms. Farr challenges only the government’s evidence on the
*1188
third element of the crime, namely the existence of an affirmative act of evasion or attempted evasion.
11
“An affirmative act requires more than the passive failure to file a tax return; it requires a positive act of commission designed to mislead or conceal. The government only needed to show one affirmative act of evasion for each count of tax evasion.”
Thompson,
The quarterly employment taxes of ATHA-Genesis specified in the indictment agаinst Ms. Farr are not, as the government argues, synonymous with the trust fund recovery penalty assessed against Ms. Farr. Because the indictment specifically charged evasion of quarterly employment taxes but the evidence and jury instructions at trial allowed the jury to convict Ms. Farr for evading the — substantively different — trust fund recovery penalty, the district court proceedings unconstitutionally broadened the basis for conviction, constructively amending the indictment. At the same time, however, the government’s evidence at trial was legally sufficient to convict Ms. Farr for tax evasion and thus no double jeopardy im *1189 pediment exists to her retrial under a properly framed indictment.
Reversed and Remanded.
Notes
. Section 3403 provides in pertinent part that "[t]he employer shall be liable for the payment of the tax required to be deducted and withheld under this chapter....”
. Section 6672 provides, inter alia:
Any person required to colleсt, truthfully account for, and pay over any tax imposed by this title who willfully fails to collect such tax, or truthfully account for and pay over such tax, or willfully attempts in any manner to evade or defeat any such tax or the payment thereof, shall, in addition to other penalties provided by law, be liable to a penalty equal to the total amount of the tax evaded, or not collected, or not accounted for and paid over....
. This language is drawn from Count Two of the indictment. Count One similarly charged Ms. Farr with evading quarterly employment taxes due for 1995, a period during which Mr. Farr was still alive and operating the clinic; because the jury acquitted Ms. Farr on that count, it is not before us in this appeal.
. Courts and commentators have long referred to the equitable principle of lifting or drawing aside the "thin guise” that is “the veil of corporate entity" to exрose the actual individuals "hiding behind” it. I.M. Worm-ser,
Piercing the Veil of Corporate Entity,
12 Colum. L.Rev. 496, 504, 499, 497 (1912);
see Fairfield County Tpk. Co. v. Thorp,
. As the government notes, while there is a linguistic distinction between the term “tax” employed in Section 7201 and the term "penalty” used in Section 6672, 26 U.S.C. § 6671 explicitly states that, "[e]xcept as otherwise provided,” any Code reference to a “tax” imposed also includes penalties and liabilities such as the trust fund recovery penalty. At the same time, as the defendant notes, Section 7202 may provide a more tailored avenue for prosecution of those who fail to pay Section 6672 assessments: Section 7202 tracks the language of Section 6672 and makes a responsible employee’s willful failure to pay a felony punishable by five years in prison and a $10,000 fine. See 26 U.S.C. § 7202.
.
See also Hunter,
. We acknowledge that in some constructive amendment cases we have loosely invoked the term “harmless error.”
See Bishop,
. Further underscoring the unlikelihood that the court meant to equate the term "payroll tax” with "trust fund recovery penalty” as a matter of law for all purposes based merely on Section 6671's statement that the term "tax” in the Code usually also means "penalty,” see
Scotto,
. The government suggests it might have addressed the problem with its indictment in this case if Scotto had been decided earlier, but without the benefit of the case it could not have foreseen the problem. But, while it is surely true that Scotto was decided after the indictment in this cáse, it came only two weeks after the entry of this indictment, over five months beforе trial began, and the government was of course free to seek a superseding indictment at any time prior to trial.
.The double jeopardy clause provides, "nor shall any person be subject for the same of-fence to be twice put in jeopardy of life or limb.” U.S. Const, amend. V.
. In a footnote, Ms. Farr also asserts that there was insufficient evidence to support the first element of the crime because, as she asserted in her argument for reversal, she did not personally owe the quarterly employment taxes of ATHA-Genesis. We need not pass on this argument because sufficient evidence showed that she at least owed the trust fund recovery penalty, which is, as we have already explained in footnote 5, also a “substantial tax liability.’’ See 26 U.S.C. § 6671. To the extent that she challenges the use of Section 7201 rather than Section 7202 to prosecute hеr failure to pay a Section 6672 liability, that question does not pertain to evidentiary sufficiency but is a question of law we have left open. See supra Part II.B.
. Because we have resolved this appeal without the need to consider the items in the govemment's addendum to its supplemental appendix, we dismiss Ms. Farr’s motion to strike it as moot. We deny Ms. Farr's motion to strike the government’s entire answer brief. Because we reverse Ms. Farr’s conviction on the basis of an unconstitutional constructive amendment, we also have no need to consider her alternative challenge that the district court's contested jury instruction equating quarterly employment taxes and the trust fund recovery penalty impermissibly directed the jury that the government had proven the first essential element of Section 7201 (a substantial tax liability), except to note that it, too, does not implicate the sufficiency of the evidence against her and thus could not bar retrial.
