George S. Nalle III and Carole Nalle, and Charles A. Betts and Sylvia I. Betts (“Nalle and Betts”) appeal from the Tax Court’s denial of their request for an award of attorney’s fees as provided by 26 U.S.C. § 7430 (1988). The Tax Court- decided that Nalle and Betts had failed to establish as required by § 7430 that the position of the Commissioner of Internal Revenue (“Commissioner”) in the underlying litigation was not substantially justified. Finding no abuse of discretion, we affirm.
I
This appeal concerns the second phase of litigation between Nalle and Betts and the Commissioner over the Commissioner’s denial of rehabilitation tax credits claimed by Nalle and Betts for the substantial rehabilitation of several houses in Austin, Texas. Pursuant to Treasury Regulation § 1.48-12(b)(5), 1 the Commissioner disallowed credits which Nalle and Betts had claimed under 26 U.S.C. § 48 (1988) 2 because they had moved the houses prior to rehabilitating them.
Nalle and Betts contested the Commissioner’s decision. On appeal from the Tax Court,
3
this Court held the Treasury Regulation invalid because it contradicted the plain
*191
meaning of § 48.
Nalle v. Commissioner,
Having won on the merits, Nalle and Betts petitioned the Commissioner for reimbursement of their attorney’s fees. The Commissioner denied the petition, and the Tax Court upheld the Commissioner’s decision.
Nalle v. Commissioner,
II
Nalle and Betts contend that the district court should have granted their petition for attorney’s fees. We review the Tax Court’s determination of whether the Commissioner’s position was not substantially justified for abuse of discretion.
Bouterie v. Commissioner,
Section 7430 of the Internal Revenue Code provides that parties who prevail in tax proceedings may recover their attorney’s fees.
See Bouterie,
(1) The position of the United States in the proceeding was not substantially justified;
(2) they have substantially prevailed with respect to the amount in controversy or with respect to the most significant issue or set of issues presented; and
(3) they meet applicable net worth requirements.
26 U.S.C. § 7430(c)(4)(A). The only element at issue in this case is whether the Commissioner’s position was not substantially justified. Substantially justified means “justified to a degree that could satisfy a reasonable person” and having a “reasonable basis both in law and fact.”
Pierce v. Underwood,
In determining whether the Commissioner’s position was not substantially justified, the question is whether the Commissioner acted unreasonably — that is, whether she knew or should have known that her position was invalid at the onset of the litigation.
See Bouterie,
In this ease, the validity of Regulation 1.48 — 12(b)(5) under 26 U.S.C. § 48 presented an issue of first impression. Although other courts have held that the Commissioner was substantially justified in defending her position when her interpretation of a relevant statute had not previously been
*193
ruled on,
10
this Court has held that “[w]hen Congress adopts a new law the clear and unequivocal language of which unmistakably [excludes the Commissioner’s position], the absence of a new decision recognizing the obvious does not equate with unsettled law or first impression in the context of this matter.”
Estate of Perry v. Commissioner,
Nalle and Betts argue that this is one of those cases — that is, that § 48’s language was clear and unequivocal and that the Commissioner’s position was so clearly contrary to that language that its invalidity should have been obvious. In
Nalle I,
this Court held that the Commissioner’s interpretation of § 48 was “logically] incoherent,”
The Commissioner cannot explain away th[e] ultimate incompatibility of his regulation with the statute by reference to the legislative history; where a plain reading of the statute precludes the Commissioner’s interpretation, no legislative history— be it ever so favorable — can redeem it.
Id. at 1140. Consequently, we rejected the Commissioner’s reliance on the legislative history. Id. Given this Court’s findings in Nalle I, Nalle and Betts accordingly argue that the Tax Court abused its discretion in finding that they had failed to prove that the government’s position had a unreasonable basis and consequently was not substantially justified.
The Commissioner responds that, although this court in Nalle I rejected her interpretation of § 48, we did not hold that her interpretation as promulgated in Regulation 1.48-12(b)(5) had no basis in the legislative history. Indeed, we noted that:
[T]he Tax Court’s conclusion that the ... regulation vindicated the statute’s intent to revitalize depressed areas, stated most forcefully in the legislative history appended to the 1981 amendments, is not entirely *194 without foundation; Congress undoubtedly considered the bill’s revitalizing potential as among its more attractive features.
Id. at 1137-38. Nevertheless, we rejected her interpretation in favor of “[a] better reading of the legislative history” and the plain wording of the statute. Id. at 1138.
Based on these holdings in
Nalle I,
the Tax Court determined that the legislative history gave enough support to the Commissioner’s interpretation of § 48 to make her defense of Regulation 1.48 — 12(b)(5) reasonable: “Given the gradual development of the law respecting eligibility for the investment tax credit for rehabilitation costs under section 48 and the known facts concerning petitioners’ activities, we conclude that it was reasonable for [the Commissioner] to both enforce [the regulation] and defend its validity in this case.”
Nalle II,
Nalle and Betts suggest that the holdings in
Nalle I
require us to hold that the Tax Court abused its discretion because reliance on a regulation that conflicts with the plain language of a federal statute is necessarily unreasonable. However, whether the Tax Court abused its discretion in denying attorney’s fees turns not on the
existence of
a conflict between the regulation and the statute, but on how
obvious
that conflict was at the onset of litigation.
Cf. Federal Election Comm’n v. Rose,
In this case, although the Commissioner’s reliance on selected legislative history of § 48 was in error, her interpretation of § 48 was “not entirely without foundation.”
Nalle I,
Ill
For the foregoing reasons, we AFFIRM *195 the judgment of the Tax Court. 15
Notes
. Regulation 1.48 — 12(b)(5) states that:
A building ... is not a qualified rehabilitation building unless it has been located where it is rehabilitated for the thirty-year period immediately preceding the date physical work on the rehabilitation began in the case of a "30-year building” or the forty-year period immediately preceding the date physical work on the rehabilitation began in the case of a "40-year building.”
. This section defines a “qualified rehabilitated building” as:
[A]ny building (and its structural components)—
(i) which has been rehabilitated;
(ii) which was placed into service before the beginning of the rehabilitation; and
(iii) 75 percent or more of the existing external walls of which are retained in place as external walls in the rehabilitation process.
26 U.S.C. § 48(g)(1)(A).
.The Tax Court had upheld the regulation.
Nalle v. Commissioner,
.
See, e.g., Underwood,
.
See, e.g., Bouterie,
.
See, e.g., Estate of Johnson v. Commissioner,
.
See Lennox,
.
See, e.g., Heasley,
.
See, e.g., Smith v. United States,
.
See TKB Int'l,
.
See Commissioner v. Acker,
.See also City of Tucson v. Commissioner,
. Given that we base our conclusion on the statute and legislative history, we do not reach either (1) Nalle and Betts arguments that the Tax Court improperly relied on whether the Commissioner acted in good faith or (2) the Commissioner's contentions that she was substantially justified in defending her position because she relied on a final regulation rather than a proposed regulation.
. Accordingly, while the Commissioner’s use of legislative history may have been " 'the equivalent of entering a crowded cocktail party and looking over the heads of the guests for one's friends,'”
Nalle I,
.
Compare Portillo,
Because we maintain the requirement that the Commissioner have some rational basis for her regulations even on issues of first impression, we avoid Nalle and Betts dire prediction that the first challenge to any regulation will be “free of charge” to the Commissioner no matter how egregious the regulation.
See Mearkle,
