30
Opinion of the Court
ered two factors paramount in determining whether retroactive application of a tax violates due process: whether the taxpayer had actual or constructive notice that the tax statute would be retroactively amended, and whether the taxpayer reasonably relied to his detriment on preamendment law. The court concluded that both factors rendered retroactive application of the amendment in this case unduly harsh and oppressive and therefore unconstitutional. Judge Norris dissented. In his view, the 1987 amendment was within the wide latitude of congressional authority to legislate retroactively in regulating economic activity. We granted certiorari, 510 U. S. 810 (1993).
II
This Court repeatedly has upheld retroactive tax legislation against a due process challenge. See, e. g., United States v. Hemme, 476 U. S. 558 (1986); United States v. Darusmont, 449 U. S. 292 (1981); Welch v. Henry, 305 U. S. 134 (1938); United States v. Hudson, 299 U. S. 498 (1937); Milliken v. United States, 283 U. S. 15 (1931); Cooper v. United States, 280 U. S. 409 (1930). Some of its decisions have stated that the validity of a retroactive tax provision under the Due Process Clause depends upon whether "retroactive application is so harsh and oppressive as to transgress the constitutional limitation." Welch v. Henry, 305 U. S., at 147, quoted in United States v. Hemme, 476 U. S., at 568-569. The "harsh and oppressive" formulation, however, "does not differ from the prohibition against arbitrary and irrational legislation" that applies generally to enactments in the sphere of economic policy. Pension Benefit Guaranty Corporation v. R. A. Gray & Co., 467 U. S. 717, 733 (1984). The due process standard to be applied to tax statutes with retroactive effect, therefore, is the same as that generally applicable to retroactive economic legislation:
"Provided that the retroactive application of a statute is supported by a legitimate legislative purpose furthered
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