38
O'Connor, J., concurring in judgment
repose. For example, a "wholly new tax" cannot be imposed retroactively, United States v. Hemme, 476 U. S. 558, 568 (1986), even though such a tax would surely serve to raise money. Because the tax consequences of commercial transactions are a relevant, and sometimes dispositive, consideration in a taxpayer's decisions regarding the use of his capital, it is arbitrary to tax transactions that were not subject to taxation at the time the taxpayer entered into them. See Welch v. Henry, supra, at 147.
Although there is also an element of arbitrariness in retroactively changing the rate of tax to which the transaction is subject, or the availability of a deduction for engaging in that transaction, our cases have recognized that Congress must be able to make such adjustments in an attempt to equalize actual revenue and projected budgetary requirements. In every case in which we have upheld a retroactive federal tax statute against due process challenge, however, the law applied retroactively for only a relatively short period prior to enactment. See United States v. Hemme, supra, at 562 (1 month); United States v. Darusmont, supra, at 294-295 (10 months); United States v. Hudson, 299 U. S. 498, 501 (1937) (1 month). In Welch v. Henry, supra, the tax was enacted in 1935 to reach transactions completed in 1933; but we emphasized that the state legislature met only biannually and it made the revision "at the first opportunity after the tax year in which the income was received." 305 U. S., at 151. A period of retroactivity longer than the year preceding the legislative session in which the law was enacted would raise, in my view, serious constitutional questions. But in keeping with Congress' practice of limiting the retroactive effect of revenue measures (a practice that may reflect Congress' sensitivity to the due process problems that would be raised by overreaching), the December 1987 amendment to § 2057 was made retroactive only to October 1986. Given our precedents and the limited period of retroactivity, I con-
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