Boggs, J., delivered the opinion of the court, in which SILER, J., joined. SUHRHEINRICH, J. (pp. 716-723), delivered a separate dissenting opinion.
OPINION
BOGGS, Circuit Judge.
On March 29, 2000, a grand jury returned a superseding indictment charging Virginia Cockett with twenty-two counts of aiding and assisting in the preparation of a false federal income tax return, in violation of 26 U.S.C. § 7206(2), and four counts of failing to file a federal tax return, in violation of 26 U.S.C. § 7203. After the district court severed the four failure-to-file counts from the indictment, a jury trial commenced in which the remaining twenty-two counts of aiding and assisting in the preparation of a false tax return were tried. The government dismissed Count One of the indictment due to the unavailability of a witness during the trial and on November 30, 2000, the jury found Cockett guilty on Counts Two through Twenty-two of the indictment.
On May 1, 2001, the district court departed downward from a sentencing range of 15-21 months’ incarceration to two years’ probation on each count, to be served concurrently. The government appeals Cockett’s criminal sentence, arguing that the district court’s finding at sentencing, that Cockett was suffering from a significantly reduced mental capacity at the time of the offense, directly conflicts with the jury’s verdict and therefore the downward departure was in violation of law. In the alternative, should we find that such a departure is permissible as a matter of law, the government contends that the record clearly did not support the district court’s factual determination. We reject these arguments and affirm the district court’s decision to depart downward.
[708]*708I
In 1997 and 1998, Virginia Cockett prepared twenty-one false federal tax returns for nine individual low-income women, in order to obtain a refund for each woman under the Earned Income Tax Credit provision of the Internal Revenue Code.1 At that time, Cockett was a nurse at the Grace Ross Medical Center in Detroit, Michigan. While at the medical center, she met several women who brought their children in for health services. Cockett offered to prepare tax returns for these women, along with other women she knew in her neighborhood. Cockett entered inflated income figures and false information regarding each woman’s dependants on the returns. Several of the women for whom she prepared returns testified that Cockett requested one-half of the refund received from the IRS as compensation for preparing each return, yet in several cases she did not receive this “payment.” When the refunds did not arrive from the IRS as anticipated, Cockett, on two occasions, wrote letters to the IRS inquiring into the status of the refunds.
Although Cockett prepared these returns and letters, she did not enter her name as the tax preparer on the forms, nor did she sign her name to the letters sent to the IRS. Cockett also back-dated several returns, in order to make it appear that they were filled out before the filing deadline. When the authorities finally caught up with Cockett, she admitted having prepared the twenty-one returns at issue in this case, but told the IRS agent investigating her case that the income information reported on the returns was provided by the respective taxpayers. Cockett was indicted on March 29, 2000, on twenty-two counts of aiding and assisting in the preparation of false federal tax returns.
As of April 5, 2000, Cockett began seeing a psychologist, Dr. Michael Abramsky, on a weekly basis. Dr. Abramsky sought a psychiatric consultation for psychotropic medication and prescribed Prozac for Cockett. In taking Cockett’s history, Dr. Abramsky noted that Cockett appeared to have suffered from intermittent immobilizing depressions over the last fifteen years and was somewhat naive, rigid, and had difficulty “being insightful about her own situation.”
Based on Dr. Abramsky’s representations, the district court ordered a psychological evaluation of Cockett, to determine her competency to stand trial. The court ordered that the evaluation be done by another psychologist, Dr. Newton Jackson, who was agreed to by both the government and the defense counsel. Dr. Jackson met with Cockett for a total of three hours on April 11, 2000 and April 17, 2000. She also completed the Minnesota Multi-phasic Personality Test — Second Edition (MMPI-2). Dr. Jackson stated in his report that Cockett was experiencing perceptual disturbances and that she appeared “to exhibit moderate to severe symptoms of both a depressive disorder and a thinking disorder at the present time.” In analyzing the MMPI-2 results, Dr. Jackson noted that “[pjersons with this broad-ranging form of profile elevation often are diagnosed as seriously mentally ill,” and that since her “F(p) scale scores” were all within normal limits, it was unlikely that she was attempting to fake an impairment. On this basis, Dr. Jackson [709]*709concluded that although Cockett “appears to understand in general the nature and object of the proceedings against her,” she was not competent to stand trial since her mental condition prevented her from cooperating “in a rational manner with an attorney in preparing a defense for herself.” Nevertheless, Dr. Jackson noted that if Cockett were to be provided with appropriate psychoactive medications and psy-chotherapeutic treatment, she would be able to achieve the competency necessary to stand trial within the time limit permitted by statute. Finally, Dr. Jackson stated that he was unable, during this initial evaluation, to form an opinion regarding her legal sanity at the time of the alleged offenses.
Relying on Dr. Jackson’s report, the district court declared Cockett incompetent to stand trial on April 28, 2000, but further ordered that Cockett submit to psychological treatment, pending a re-evaluation of her status. Cockett continued with her therapy under Dr. Abramsky’s care. In August 2000, Dr. Jackson again evaluated Cockett’s condition and determined that Cockett was now fit to stand trial. Furthermore, Dr. Jackson concluded that he could now address the question of her mental condition at the time of the alleged offenses, noting in relevant part:
Mrs. Cockett’s narrative indicated that at the time of the alleged offenses, she believes she was attempting to assist others in filing for tax refunds to which they were legitimately entitled. However, Mrs. Cockett also described experiencing significant symptoms of depression and occasional symptoms of a thought disorder at those times, and she recalled being so immobilized and confused that she was unable to bring enough coherency and organization to her own documents in order to file her personal tax returns on time.
Despite Mrs. Cockett’s admitted mental difficulties around the times of the alleged offenses, she insisted that at no time did she willfully or deliberately engage in any behavior which she knew would be wrongful.
In this examiner’s opinion, Mrs. Cock-ett’s ongoing psychiatric symptoms at the time of the alleged offenses did not rise to a level which would have caused her to be unable to appreciate the wrongfulness of her conduct. Mrs. Cockett is not viewed by this examiner as being able to meet the criteria for legal insanity at the time of the charged offenses. However, she does appear to have been experiencing confusion and impairment in her thinking and judgment during those periods of time.
On November 28, 2000, the trial commenced. The defense theory at trial was that Cockett did not act willfully, having prepared the returns for the women in this ease with a good-faith belief that she was not acting in violation of the law. In support of this theory, the defense presented the testimony of Cockett’s sister, Joyce Bloodsaw, and Dr. Jackson, as well as the records of her attendance at the medical center from 1994 through 1999. Bloodsaw provided information about Cockett’s difficult life,2 and described the changes that she observed in her sister’s appearance and mental condition during the relevant time period. The attendance records, testified to by Dwayne Ewell of the Human Resources Department at the medical center, demonstrated that Cockett was often late, took sick leave and vacation, and had unpaid absences. In response to the defense’s case, the government called Cock-ett’s supervisor, Marjorie Harris, as a Te-[710]*710buttal witness, who testified that she had not noticed a change in Cockett’s behavior in terms of her professionalism and organization until after her son died in August 1999. However, Harris acknowledged that she did not see Cockett every day, as they both had duties off site, and had not associated with Cockett outside of work.
On November 30, 2000, the jury rendered its verdict of guilty on all counts, thereby rejecting Cockett’s defense. The probation department subsequently issued a presentence investigation report, which calculated Cockett’s total offense level to be 14, with a criminal history category of I. The resulting sentencing range was 15 to 21 months of incarceration.
Prior to sentencing, Cockett moved for a downward departure on the basis of various grounds, including a diminished capacity and mental health condition pursuant to sections 5K2.13 and 5H1.6 of the United States Sentencing Guidelines (USSG). In support of the motion, Cockett submitted Dr. Jackson’s prior evaluation reports, along with a letter from Dr. Jackson dated March 19, 2001, and a letter from Dr. Abramsky, dated February 21, 2001.
In his March 2001 letter, Dr. Jackson took a stronger position than in his previous reports, stating in relevant part:
On the basis of my interviews with Mrs. Cockett, it appeared to me that although she engaged in illegal behaviors, she could not consider herself to have been a conscious and willful lawbreaker. Her image of herself is of a person who helps others, rather than a person who takes advantage of them.
At the time Mrs. Cockett committed the offenses leading to her finding of guilt, it is my opinion that she was experiencing ongoing symptoms of impairment in her ability both to exercise the power of reason and to control her behavior. Thus, although Mrs. Cockett has been found guilty of committing the offenses with which she was charged, it is my opinion that she did so while suffering a significantly reduced mental capacity. She continues to exhibit some of these symptoms, and ongoing support and followup care for her is indicated. She does not appear to exhibit any antisocial personality characteristics which would cause her to be a risk for further illegal actions if she was not incarcerated.
Dr. Abramsky similarly noted in his letter that “I have never found that Ms. Cockett can understand that she actually did something wrong ... [and] her denial of responsibility is not a conscious, manipulative or practiced one.” He also stated that for the last fifteen years, Cockett has suffered from an intermittent immobilizing depression.
The government objected to the downward departure requested by the defense, arguing primarily that her crime required a level of “acumen and intellectual sophistication” that could not be reconciled with a defense of diminished capacity, that her lack of signature on the returns combined with the fact that she did not give most of the taxpayers copies of their returns suggests that she knew what she was doing and was trying to avoid detection, and that there was no evidence of a link between Cockett’s emotional difficulties and her criminal behavior. Ultimately the district court granted Cockett’s request for a downward departure on the basis of USSG § 5K2.13, finding that Cockett had committed the offense of aiding and assisting in the preparation of false tax returns while suffering from a significantly reduced mental capacity.
II
Did the District Court Err as a Matter of Law in Departing Downward?
Although we generally review a district court’s decision to grant a down[711]*711ward departure for abuse of discretion, United States v. Stewart, 306 F.3d 295, 329 (6th Cir.2002), we review a district court’s determination that a particular factor is a permissible basis for departure de novo, as it is a question of law and not fact. United States v. Reed, 264 F.3d 640, 646 (6th Cir.2001). Since we are being asked to determine if the district court erred as a matter of law in departing downward on the basis of diminished capacity, where the jury determined that Cockett acted voluntarily and deliberately in committing her offense, we review this issue de novo.
As a preliminary matter, the government is correct that the district court, when sentencing a defendant under the guidelines, cannot rely on a finding that directly conflicts with the jury’s verdict. Reed, 264 F.3d at 648. In Reed, the defendant, a criminal defense attorney, was convicted of conspiracy to launder money based upon her conduct of using her office as a pick-up and drop-off point for money exchanged between a supplier and a distributor of narcotics. Reed facilitated the payments when the supplier, her client, informed Reed that he could not pay her legal fees until the distributor repaid his drug debt. When the exchange was made, a portion of the money exchanged was used to pay the legal fees owed to Reed by the drug supplier. The remaining money was stored in Reed’s office for her client’s drug courier to retrieve and transport out of state. Reed, 264 F.3d at 643-44.
At sentencing, the district court departed downwards from the applicable guideline range, relying on a number of different factors, including that “the record did not reflect that she intended to facilitate additional drug transactions.” Id. at 646. This court held that this was an impermissible basis for a downward departure, since it conflicted directly with the jury’s verdict that necessarily found beyond a reasonable doubt that Reed conspired to promote unlawful drug trafficking. Id. at 648.
Similarly, the government would prevail in this case if a finding by the district court of diminished capacity could only be understood to contradict directly with the jury’s verdict, which found Cockett guilty beyond a reasonable doubt of voluntarily and intentionally violating the tax laws. However, unlike the situation in Reed, it is possible to reconcile these two findings, given their differing scopes of application and the fact that a direct causal link between the sentencing factor and the offense conduct is unnecessary.
Diminished Capacity as a Sentencing Factor
The Guidelines’ approach to taking into account a defendant’s diminished capacity in sentencing began with the Sentencing Reform Act in which Congress directed the Commission to consider the relevance of certain offender characteristics, including a defendant’s “mental and emotional condition to the extent that such condition mitigates the defendant’s culpability.” 28 U.S.C. § 994(d)(4)(1994). The Commission followed through on this direction in its preliminary draft of the sentencing guidelines, noting that a “mitigating factor might be the presence of a serious mental disability that did not rise to the level of a successful defense.” Preliminary Draft of Sentencing Guidelines for United States Courts, 51 Fed.Reg. 35,080, 35,131 (Oct. 1, 1986). A year later, the Commission noted in its proposed guidelines that an offense level could be decreased for “Diminished Capacity” if “the defendant committed a non-violent offense while suffering from significantly reduced mental capacity not resulting from voluntary use of drugs or other intoxicants, ... provided that the defendant’s criminal history does not indicate a need for incarceration to protect the [712]*712public.” Proposed Sentencing Guidelines for United States Courts, 52 Fed.Reg. 3920, 3970 § Y218 (Feb. 6,1987).
The concept of diminished capacity was eventually codified and placed in Chapter 5, Part K (Departures) of the Guidelines, which lays out certain recognized factors for departure from an applicable sentencing range not “adequately taken into account by the Sentencing Commission in formulating the [G]uidelines.” 18 U.S.C. § 3553(b). See also USSG § 5K2.0; Koon v. United States, 518 U.S. 81, 94-96, 116 S.Ct. 2035, 135 L.Ed.2d 392 (1996). The Commission identified a defendant’s reduced mental capacity as one circumstance in which a departure would be encouraged, noting that such an impairment would normally constitute grounds for departure. See USSG § 5K2.13; USSG Ch. 1, Pt. A(b), Departures. Specifically, section 5K2.13 of the USSG authorizes a downward departure for diminished capacity “if the defendant committed the offense while suffering from a significantly reduced mental capacity.” The application note for this section illustrates that the departure is intended to address both cognitive and volitional impairments, stating that a “significantly reduced mental capacity” means “the defendant, although convicted, has a significantly impaired ability to (A) understand the wrongfulness of the behavior comprising the offense or to exercise the power of reason; or (B) control behavior that the defendant knows is wrongful.” USSG § 5K2.13, comment. (n.l).
Willfulness in the Context of a Criminal Tax Case
In criminal tax cases such as this one, the government must establish that the defendant acted “willfully” at the time of the offense. Cheek v. United States, 498 U.S. 192, 200, 111 S.Ct. 604, 112 L.Ed.2d 617 (1991). The government is required to establish “willfulness” in criminal tax cases because Congress determined that, due to the proliferation and complexity of tax laws, an individual should not be prosecuted for failing to adhere to a tax law unless the individual was aware of the law and consciously disregarded it. See id. at 199-200, 111 S.Ct. 604. Thus, in finding Cockett guilty of violating 26 U.S.C. § 7206(2), the jury was required to find that she had willfully aided and assisted in the preparation of false tax returns. United States v. Sassak, 881 F.2d 276, 278 (6th Cir.1989). At Cockett’s trial, the jury was instructed on the requisite mental state as follows:
“Willfully” means a voluntary, intentional violation of a known legal duty. In other words, to act willfully means to act voluntarily and deliberately with the specific intent to do something the Defendant knew the law prohibited. Willfulness necessarily depends on the Defendant’s state of mind at the time the acts for which she is charged were committed. The word “knowingly” also means to act voluntarily and intentionally, and not because of mistake, accident or other innocent reasons. Accidental, inadvertent or negligent conduct does not constitute willful conduct.
In returning a guilty verdict, the jury found beyond a reasonable doubt that Cockett acted voluntarily and understood that her behavior was wrong. The government argues that the judge could not, therefore, in the sentencing phase find, by a preponderance of the evidence, that Cockett had a significantly reduced mental capacity, as this would, in its opinion, contradict the jury’s verdict.
We have already stated that if the sentencing factor of diminished capacity can only be viewed as directly conflicting with the jury’s verdict in this case, it cannot stand. Furthermore, Cockett’s contention that the government’s position fails because there is a lower standard of proof at [713]*713sentencing, requiring only that a judge’s findings be supported by a preponderance of the evidence rather than proven beyond a reasonable doubt, is in error. In fact, the government would prevail despite the lesser burden at sentencing, if we assumed that the defense and the mitigating factor were not appreciably different. In other words, if a downward departure were available only where Cockett had not acted willfully, there is no question that the judge could not subsequently find by a preponderance of the evidence that Cock-ett had not acted willfully, since the jury found beyond a reasonable doubt that Cockett had acted willfully. For this reason, many of the cases cited by Cockett are not relevant, as they reflect situations, in which a defendant was not able to prove by clear and convincing evidence that he was insane, yet the judge at sentencing applied a lower standard and found that there was enough evidence for the application of a mitigating factor on this basis.
Nevertheless, the government is not correct in concluding that the jury’s verdict, finding that Cockett had acted willfully, and the judge’s finding of diminished capacity are necessarily in conflict. In other words, Cockett could voluntarily and intentionally violate the tax laws, but nevertheless be impaired in her ability to exercise the power of reason. Impairment does not mean total absence of reason. For example, a mentally retarded individual could know that throwing a grenade into a neighbor’s yard is wrong and against the law, yet still be eligible for a downward departure under section USSG § 5K2.13 because his power to exercise reason would be impaired. After all, it is reasonable to assume, as the Sentencing Reform Act directs, that the person’s mental retardation would in fact mitigate the defendant’s culpability, even though not negating it.3
This scenario raises the question of the extent to which an impairment must have a causal link to the offense committed. If a direct causal link were required between the sentencing factor of diminished capacity and the offense, it would be difficult in this case for Cockett to prevail, as it is not apparent that her impaired ability to reason directly caused her to commit the offense. However, while it is necessary for an acquittal that a defendant prove at trial that but for his mental health problems, he would not have committed the offense, see 18 U.S.C. § 17, such a direct link is not necessary for purposes of finding that a defendant’s mental health condition warrants a downward departure at sentencing, see United States v. Sadolsky, 234 F.3d 938, 942-43 (6th Cir.2000) (holding that section 5K2.13 “does not require a direct causal link between the [significantly reduced mental capacity] and the crime charged.”).
In Sadolsky, this court considered the question of whether a defendant’s gambling problem would justify a downward departure only if he had been arrested for gambling, rather than fraud. Ibid. The court ultimately held that it was possible to grant a downward departure to defendants who are compulsive gamblers for crimes other than, but motivated by, a gambling compulsion. Id. at 943. This result is supported by the plain language of section 5K2.13, which notes that “the [714]*714extent of the departure should reflect the extent to which the reduced mental capacity [of the defendant] contributed to the commission of the offense.” (emphasis added). After all, the “purpose of [section 5K2.13 is] to mitigate the sentence of one who suffers from a diminished mental capacity.” Ibid.
In sum, since it is possible to reconcile the jury’s verdict against Cockett with the existence of a “significantly reduced mental capacity” as defined by the sentencing guidelines, the district court did not err as a matter of law by taking into account this factor when departing downward from Cockett’s applicable sentencing range.
Ill
Did the District Court Commit Clear Error in Finding that Cockett Suffered from a Significantly Reduced Mental Capacity?
When examining factual determinations made by the district court for the purpose of applying the Sentencing Guidelines, we review for clear error. See 18 U.S.C. § 3742(e); United States v. Cooper, 302 F.3d 592, 594 (6th Cir.2002). Thus, we cannot disturb the district court’s determination that Cockett committed the offense of aiding and assisting in the preparation of twenty-one false federal income tax returns while suffering from a significantly reduced mental capacity, unless the judge committed clear error in doing so.
The government argues that the district court could not have found, after viewing all of the evidence, either that Cockett suffered from a reduced mental capacity at the time of the offense or, in the alternative, that her reduced mental capacity contributed to the commission of the offenses in this case. In support of these contentions, the government points out that in order for Cockett to have perpetrated this crime, she had to have understood the complexities of tax law, and thus her ability to reason was intact. Moreover, she had to be able to appreciate the wrongfulness of her behavior, since she did not sign the tax returns, demonstrating an effort to conceal her behavior, and also back-dated several of the forms. The government also contends that Cockett’s motive was clear, as she requested to be paid half of the refund in some cases and even put her own address on some of the returns, the government argues, so that she would be able to ensure her own compensation. Finally, the government argues that Cock-ett’s “clients,” her supervisor, and the IRS agent who interviewed her all testified that she was generally clear in her thinking during the time period in which she was committing the offense at issue. The government’s theory is that if Cockett does suffer from a diminished mental capacity, this condition arose after August 1999, when her son was killed, and was not a factor that contributed to the commission of her crime. Furthermore, the government argues that the district court in ruling otherwise, has done so out of sympathy for the defendant and the traumatic events in her life, rather than on the basis of facts that can be considered in relation to the Sentencing Guidelines.
A district court’s decision to depart from the guidelines is generally “due substantial deference, for it embodies the traditional exercise of discretion by a sentencing court.” Koon, 518 U.S. at 98, 116 S.Ct. 2035. The Supreme Court explained further:
Before a departure is permitted, certain aspects of the case must be found unusual enough for it to fall outside the heartland of cases in the Guideline. To resolve this question, the district court must make a refined assessment of the many facts bearing on the outcome, informed by its vantage point and day-today experience in criminal sentencing .... District courts have an institu[715]*715tional advantage over appellate courts in making these sorts of determinations, especially as they see so many more Guideline cases than appellate courts do.
Ibid. Thus, the government has a heavy burden to bear, for we must decide, in order to overturn the district court’s decision to depart downward in this case, that the district court was clearly erroneous in finding that Cockett committed her crime while suffering from a significantly reduced mental capacity and in finding that this case fell outside of the heartland of cases covered by the Sentencing Guidelines.
There is enough evidence to support the conclusion that Cockett suffered from a depressive disorder and a thinking disorder, which potentially impaired Cockett’s power of reasoning. Both psychologists, Dr. Abramsky and Dr. Jackson, came to this conclusion independently, and their conclusions were supported by the Minnesota Multiphasic Personality Test, which was administered by Dr. Jackson.4 Furthermore, such a disorder is explicitly linked to a diminished capacity to reason during the relevant time period. This is particularly true with respect to Dr. Jackson, who noted in his second evaluation that Cockett’s “operational judgment appears to have been significantly flawed for several years,” and later stated in his post-trial letter that “[a]t the time Mrs. Cockett committed the offenses leading to her finding of guilt, it is my opinion that she was experiencing ongoing symptoms of impairment in her ability both to exercise the power of reason and to control her behavior.” Moreover, no medical evaluations were offered to contradict these diagnoses. Instead, the government relies on testimony that she appeared to be clear in her thinking when carrying on conversations and on the alleged complexity of the crime, balanced against her sister’s testimony that she was paranoid and not rational in her thinking. However, not only was the crime itself fairly simplistic, the district court is in the best position to weigh the testimony of witnesses. The district court did not clearly err in finding that Cockett’s mental condition was impaired during the time of the offense.
The second question is whether it is possible to conclude that Cockett’s mental disorders contributed to her offense. The government lays out a very convincing argument that Cockett was intellectually sophisticated, understood that she was lying on the forms and violating the law, and was in control of her behavior to the point where she sought out clients and assisted these clients in filing false tax returns in order to receive refunds. However the psychologists contend that Cockett was significantly impaired in her ability to understand that what she was doing was wrong. Not that she didn’t know that she was technically lying on the forms, or that she did not understand that she was helping the women for whom she prepared the taxes to lie, but rather that her judgment was impaired so that she understood her actions as helping these women, and thus she had rationalized the lies.5 Further[716]*716more, the government's vision of Cockett as a sophisticated criminal is weakened by the fact that she hadn’t managed to file her own tax returns over this period and her financial gain from this scheme was de minimis, since she collected nothing in the vast majority of cases. This is enough evidence to suggest that Cockett had a significantly impaired ability to exercise the power of reason as required by the Sentencing Guidelines. Although the evidence could be read to suggest otherwise, the district court did not commit clear error in this case by departing downward.
IV
For the reasons given above, we AFFIRM Cockett’s sentence.