OPINION OF THE COURT
The sole issue on this appeal is the determination of the proper method by which civil tax fraud penalties are to be assessed under 26 U.S.C. § 6653. The Internal Revenue Service (“IRS”) assessed a 50% fraud penalty on the difference between taxpayers’ true tax liability and the tax liability shown on taxpayers’ original tax returns. The district court upheld this method of computation and we affirm.
Taxpayers’ returns for 1967 through 1959 were timely filed and the taxes shown thereon timely paid. When the IRS subsequently conducted routine examinations of these returns, adjustments were made resulting in the assessment of additional taxes. Subsequent to this, taxpayers filed amended returns reporting income which had not been included in the original tax returns. The IRS then began an investigation which uncovered further unreported income of taxpayers and which eventually resulted in the bringing of fraud charges against taxpayers. On this appeal taxpayers do not contest their tax liability or the finding of fraud.
Taxpayers do contend, however, that the fraud penalty should not be applied to those deficiencies assessed because of adjustments made to the original tax return at the time routine audits were conducted. The additional taxes assessed at this time resulted from adjustments to inventories and business deductions. These adjustments apparently were not the subject of the subsequent fraud investigation which was based on omitted income. Thus the taxpayers suggest that the fraud penalty should have been computed by the following formula:
50% x [correct tax — (tax shown on original timely filed return + additional tax assessed because of routine audit on original return) ]
The fraud penalty was actually computed on the basis of this formula:
50% X [correct tax — tax shown on original timely filed return]
Taxpayers argue that the decisional law and applicable statute supports their view that the fraud penalty should not apply to nonfraudulent deficiencies assessed as a result of routine adjustments made to their original returns. We do not agree.
Under the Internal Revenue Code of 1939, the fraud penalty provision, section 293(b), provided that “if any part of any deficiency is due to fraud . then 50 per centum of the total amount of the deficiency . . . shall be so assessed . . . .” (Emphasis added.) “Deficiency” was defined un*653der section 271(a) by the following formula:
deficiency = correct tax — (tax shown on return + amounts previously assessed or collected without assessment —rebates)1
Where there have been several deficiencies, this definition quite logically requires that, in computing the amount of any new deficiency, credit should be given for deficiencies previously assessed or collected.
In computing the fraud penalty under the 1939 Code, however, courts consistently refused to apply the penalty to only this narrowly defined deficiency. E.g., Middleton v. Commissioner, 200 F.2d 94 (5th Cir. 1952); Romm v. Commissioner, 245 F.2d 730 (4th Cir.), cert. denied, 355 U.S. 862, 78 S.Ct. 94, 2 L.Ed.2d 68 (1957). Since the fraud penalty provision referred to “the total amount of the deficiency,” courts consistently reasoned that where more than one deficiency had been assessed, the penalty applied to all of the deficiencies ;2 thus, the total deficiency was held to be the difference between the correct tax and the tax shown on the original return. Romm v. Commissioner, supra; Middleton v. Commissioner, supra; Still, Inc. v. Commissioner, 19 T.C. 1072 (1953); Wilson v. Commissioner, 7 T.C. 395 (1946); J. S. McDonnell v. Commissioner, 6 B.T.A. 685 (1927).
Contrary to what taxpayers suggest, we have found no decision under the 1939 code which deviated from this method of computing the fraud penalty or even suggested that in certain situations a different method of computation would apply. Taxpayers rely heavily on J. S. McDonnell v. Commissioner, 6 B.T. A. 685 (1927) as support for the proposition that in computing the fraud penalty the IRS should allow taxpayers “legitimate adjustments” to the tax as reported on the original return.3
Taxpayers, however, have misread McDonnell. The 50% fraud penalty in that case was applied to the difference between the correct tax and the tax shown on the original return.4 The court specifically held that no error had been committed in the method of computation of the penalty.5 What the court did say, which is far different from that contended by the taxpayers, is that in computing the total tax liability and hence the correct deficiency, the IRS had failed to give credit for legitimate deductions and losses. Taxpayers, however, have not contested the final tax liability determined by the IRS and therefore McDonnell does not support taxpayers’ position. It is also significant that McDonnell was specifically cited by the same court in Wilson v. Commissioner, 7 T.C. 395, 398 (1942) when it noted that,
“[Sjince the Revenue Act of 1918, the [IRS] has consistently computed the [fraud] penalty upon the total amount understated on the return and in every instance in those cases coming before us of which we are aware, we have approved the computation.” (Emphasis added.)
We therefore conclude that under the Internal Revenue Code of 1939, it was the court-sanctioned practice of the IRS to compute fraud penalties on the difference between the correct tax and the tax shown on the original return. The only question remaining then is whether the *654enactment of the Internal Revenue Code of 1954 affected changes in this substantive policy. We think not.
The present fraud penalty provision, 26 U.S.C. § 6653(b), differs from its predecessor only in its use of the word “underpayment” rather than deficiency:
“If any part of any underpayment ... of tax required to be shown on a return is due to fraud, there shall be added to the tax an amount equal to 50 percent of the underpayment.” (Emphasis added.)
“Underpayment” is defined in section 6653(c) 6 by reference to the definition of deficiency in 26 U.S.C. § 62117 which is virtually identical to its predecessor, section 271(a). Section 6653(c), however, states that for purposes of defining deficiency, only the tax shown on the original timely filed return is to be considered.
On their face these changes appear minor and at most appear to merely clarify what the practice had been under the 1939 Code. That this was the Congressional intent is unquestionably clear from the legislative history.8 We thus agree with the Second Circuit that the Internal Revenue Code of 1954 did not change the method of computing the fraud penalty and that the method by which the IRS has computed the penalty in the present case is proper under 26 U.S.C. § 6653. See Papa v. Commissioner, 464 F.2d 150 (2nd Cir. 1972).
In view of taxpayers’ insistence that deficiencies assessed as a result of the routine audit of their returns must be applied as a credit pursuant to 26 U.S.C. § 6211(a) (1) (B), a few further observations appear necessary. First, section 6211(a)(1)(B) is identical to its predecessor under the 1939 Code, section 271(a)(1)(B), and as noted previously, prior deficiencies were never applied under the 1939 Code as a credit in determining the “total” deficiency subject to the fraud penalty.
Second, taxpayers suggest that previously assessed deficiencies should be applied as credit under section 6211 (a)(1)(B) just in some circumstances9 Yet, there is no support in the statute, its legislative history or in the case law for applying section 6211(a)(1)(B) selectively.
Third, the inequities of taxpayers’ position is manifest. Had there been only one deficiency assessed coupled with a finding that at least a part of the underpayment was due to fraud, then there would not have been any previously assessed deficiency for which taxpayers could claim a credit under section *6556211(a)(1)(B). The fraud penalty quite clearly would have been applied to the total underpayment, i. e., the difference between the correct tax and the tax shown on the original timely filed return. It does not seem likely that Congress would have conditioned the severity of the fraud penalty on such a fortuity as whether or not a routine audit had been conducted prior to the assessment giving rise to the fraud charge.
Lastly, if there is ambiguity in the statutory language, we think the clear Congressional purpose must prevail.10 Since Congress unquestionably did not intend to modify the substantive law under the 1939 Code, we agree with the Second Circuit that the fraud penalty under 26 U.S.C. § 6653 is properly computed on the basis of the difference between the correct tax and the tax shown on the original timely filed return. Accord, Papa v. Commissioner, 464 F.2d 150 (2nd Cir. 1972).
The order of the district court of-August 29,1973 will be affirmed.