After conviction and punishment for tax fraud during the years 1977 and 1978, John R. Louis ("Louis") challenges the IRS's imposition under 26 U.S.C. § 6653(b) of additions to tax for fraud for the years 1976, 1977 and 1978 as violative of: (1) the Double Jeopardy Clause; (2) the Eighth Amendment; and (3) the Fifth and Sixth Amendments. We review the tax court's rejection of Louis's challenges de novo and affirm.

This court recently held additions to tax for fraud to be a civil remedy, not a criminal punishment, and therefore beyond the scope of the Double Jeopardy Clause, which prohibits only multiple criminal punishments for the same offense. See I & O Publishing Co., Inc. v. Commissioner of Internal Revenue Serv., 131 F.3d 1314, 1316 (9th Cir.1997). Shortly before I & O Publishing was filed, the Supreme Court decided Hudson v. United States, 522 U.S. 93, 118 S. Ct. 488, 139 L. Ed. 2d 450 (1997), which considered the nature of monetary penalties imposed on bank officers previously convicted of misapplying bank funds. Hudson laid out a two-step analysis to determine whether a penalty is civil or criminal. See id. at 493, 118 S. Ct. 488. Apparently Hudson was not called to the attention of the I & O Publishing panel, which concluded that additions to tax for fraud are not punishment but did not explicitly employ the two-step Hudson test. We now apply that test and affirm.1

According to Hudson, determining whether a particular punishment is criminal or civil involves a two-step process: (1) statutory construction to determine whether Congress indicated an express or implied preference for one label or the other; and if Congress intended to establish a civil penalty, (2) an evaluation of " 'whether the statutory scheme [is] so punitive either in purpose or effect' " as to transform the intended civil sanction into a criminal penalty. Id. at 493, 118 S. Ct. 488 (quoting United States v. Ward, 448 U.S. 242, 248-49, 100 S. Ct. 2636, 65 L. Ed. 2d 742 (1980)). The following factors are "useful guideposts" in determining whether the second step is satisfied:

(1) "[w]hether the sanction involves an affirmative disability or restraint"; (2) "whether it has historically been regarded as a punishment"; (3) "whether it comes into play only on a finding of scienter "; (4) "whether its operation will promote the traditional aims of punishment-retribution and deterrence"; (5) "whether the behavior to which it applies is already a crime"; (6) "whether an alternative purpose to which it may rationally be connected is assignable for it"; and (7) "whether it appears excessive in relation to the alternative purpose assigned."

Id. at 493, 118 S. Ct. 488 (quoting Kennedy v. Mendoza-Martinez, 372 U.S. 144, 168-69, 83 S. Ct. 554, 9 L. Ed. 2d 644 (1963)). These factors are to be considered in relation to the "statute on its face," and "only the clearest proof" will suffice to override legislative intent that a remedy be civil in nature. Id. at 493, 118 S. Ct. 488 (citing Ward, 448 U.S. at 249, 100 S. Ct. 2636).

There is no double jeopardy problem with the addition to tax for fraud imposed for 1976, since Louis was not criminally prosecuted for that year. Turning to 1977 and 1978, it is clear Congress intended additions to tax for fraud to be "a civil, not a criminal, sanction." Mitchell, 303 U.S. at 402, 58 S. Ct. 630. Mitchell 's conclusion that Congress intended additions to tax for fraud to be a civil sanction is not limited to cases in which the taxpayer has previously been acquitted, rather than convicted, of criminal tax fraud. See Mitchell, 303 U.S. at 401-05, 58 S. Ct. 630.

Considering the "guidepost" factors laid out in Hudson, Louis has produced little evidence, much less the "clearest proof," that the additions to tax for fraud imposed in his case are so punitive as to overcome clear congressional intent that they be civil rather than criminal in nature. Additions to tax for fraud do not amount to an affirmative disability or restraint, nor have they historically been regarded as punishment. See Hudson, 522 U.S. at ----, 118 S. Ct. at 496. Their purpose is remedial; they "are provided primarily as a safeguard for the protection of the revenue and to reimburse the Government for the heavy expense of investigation and the loss resulting from the taxpayer's fraud." Mitchell, 303 U.S. at 401, 58 S. Ct. 630; see also I & O Publishing, 131 F.3d at 1316. Even if deterrence is an additional purpose for the additions, the Supreme Court has recognized that monetary penalties may deter others without being criminal in nature. See Hudson, 522 U.S. at ----, 118 S. Ct. at 496 ("[T]he mere presence of this purpose is insufficient to render a sanction criminal.").

Several of the guidepost factors are present to some degree, but they are insufficient to render the additions to tax criminal. Although it is certainly true that fraud, and therefore fraudulent intent, are prerequisites to the imposition of an addition to tax for fraud, punishing fraudulent intent is not the central focus of these additions to tax. The fraud requirement is designed to ensure that the additions are imposed only on taxpayers who engage in the type of deceptive behavior that is difficult and costly for the IRS to detect. See Mitchell, 303 U.S. at 401, 58 S. Ct. 630; see also United States v. Alt, 83 F.3d 779, 782-83 (6th Cir.1996) ("fraudulent filings are more difficult to catch than merely negligent ones"). To the extent this factor may favor a finding that the addition to tax is punitive, it does so only to a very limited degree.

It is clear that Congress intended tax fraud to be subject to both criminal sanctions and additions to tax for fraud. This factor alone, however, "is insufficient to render the money penalties ... criminally punitive." Hudson, 522 U.S. at ----, 118 S. Ct. at 496. Congress may impose both civil and criminal penalties in connection with the same proscribed behavior without violating the Double Jeopardy Clause. See id. at ----, ----, 118 S. Ct. at 493, 496.

Finally, while it is true that the magnitude of the addition will fluctuate somewhat over time as tax rates rise and fall, the addition achieves "rough justice" and is not "so divorced from the reality of what the government suffered in damages and expenses as to constitute punishment." United States v. Morgan, 51 F.3d 1105, 1115 (2d Cir.1995) (citing United States v. Halper, 490 U.S. 435, 449, 109 S. Ct. 1892, 104 L. Ed. 2d 487 (1989) (overruled in part on other grounds by Hudson, 522 U.S. at ---- - ----, 118 S. Ct. at 494-95)); see also Alt, 83 F.3d at 782.2 Moreover, even if we agreed with Louis that this final guidepost factor may suggest the additions to tax for fraud were punitive, it would be improper to elevate this factor to dispositive status, as the Court did in Halper. See Hudson, 522 U.S. at ----, 118 S. Ct. at 494.

The Excessive Fines Clause of the Eighth Amendment prohibits the government from imposing excessive fines as punishment. U.S. Const. amend. VIII. Even a civil sanction may be punitive for Eighth Amendment purposes. See Austin v. United States, 509 U.S. 602, 610, 113 S. Ct. 2801, 125 L. Ed. 2d 488 (1993). A civil sanction is punitive if "it can only be explained as serving in part to punish." Id.; see also United States v. Bajakajian, 524 U.S. 321, ----, 118 S. Ct. 2028, 2034 n. 4, 141 L. Ed. 2d 314 (1998). In making this determination, the court considers factors such as the language of the statute creating the sanction, the sanction's purpose(s), the circumstances in which the sanction can be imposed, and the historical understanding of the sanction. See Bajakajian, 524 U.S. at ----, 118 S. Ct. at 2033-35.

Although § 6653(b)(3) provides an "innocent spouse exception" similar to the "innocent owner defense" of the forfeiture statute considered punitive in Austin, 509 U.S. at 619, 113 S. Ct. 2801, the statutory language provides no other indication of punitive intent. Furthermore, as we noted in Part II, the purposes of additions to tax for fraud are primarily remedial: to protect the revenue and to reimburse the government for the expense of investigating fraud. Moreover, unlike the forfeiture at issue in Bajakajian, additions to tax for fraud can be imposed regardless of whether the taxpayer has been convicted of a felony, and are not imposed as part of a criminal sentence. See Mitchell, 303 U.S. at 406, 58 S. Ct. 630 (taxpayer liable for additions to tax for fraud even though he was acquitted of the criminal charges).

The eighteenth-century predecessors to § 6653(b) which Louis cites do not support his argument that additions to tax for fraud have historically been understood as punitive. The statutes merely provide that a person who did not pay his taxes was subject to a fine equal to a stipulated percentage of the underpayment. Louis has not shown that § 6653(b)'s many predecessors were considered punitive rather than remedial.

We therefore conclude that additions to tax for fraud are "properly ... characterized as remedial," Austin, 509 U.S. at 608 n. 4, 113 S. Ct. 2801, and as such, are not subject to review under the Excessive Fines Clause. Cf. Little v. Commissioner, 106 F.3d 1445, 1454 (9th Cir.1997) (finding that additions to tax for negligence under 26 U.S.C. § 6653(a) are remedial for purposes of the Excessive Fines Clause).

Louis' argument that the Fifth and Sixth Amendments were violated by the administrative assessment of additions to tax for fraud fails for the same reason as his Double Jeopardy challenge-the additions are civil, not criminal, in nature.

AFFIRMED.