244
Opinion of the Court
tions periods for designated items), but in the case where the taxpayer has filed a timely tax return and the IRS is claiming a deficiency in taxes from that return, the interplay of §§ 6512(b)(3)(B) and 6511(b)(2) generally ensures that the taxpayer can obtain a refund of any taxes against which the IRS is asserting a deficiency. In most cases, the notice of deficiency must be mailed within three years from the date the tax return is filed. See 26 U. S. C. §§ 6501(a) and 6503(a)(1); Badaracco v. Commissioner, 464 U. S. 386, 389, 392 (1984). Therefore, if the taxpayer has already filed a return (albeit perhaps a faulty one), any claim filed "on the date of the mailing of the notice of deficiency" would necessarily be filed within three years from the date the return is filed. In these circumstances, the applicable look-back period under § 6512(b)(3)(B) would be the 3-year period defined in § 6511(b)(2)(A), and the Tax Court would have jurisdiction to award a refund.
Therefore, in the case of a taxpayer who files a timely tax return, § 6512(b)(3)(B) usually operates to toll the filing period that might otherwise deprive the taxpayer of the opportunity to seek a refund. If a taxpayer contesting the accuracy of a previously filed tax return in Tax Court discovers for the first time during the course of litigation that he is entitled to a refund, the taxpayer can obtain a refund from the Tax Court without first filing a timely claim for refund with the IRS. It does not matter, as it would in district court, see § 7422 (incorporating § 6511), that the taxpayer has discovered the entitlement to a refund well after the period for filing a timely refund claim with the IRS has passed, because § 6512(b)(3)(B) applies "whether or not [a claim is] filed," and the look-back period is measured from the date of the mailing of the notice of deficiency. Ibid. Nor does it matter, as it might in a refund suit, see 26 CFR § 301.6402- 2(b)(1) (1995), whether the taxpayer has previously apprised the IRS of the precise basis for the refund claim, because 26 U. S. C. § 6512(b)(3)(B) posits the filing of a hypothetical claim
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