PHILLIPS, Circuit Judge:
Jay and Elizabeth Karpa appeal from the Tax Court's decision upholding the Commissioner's proposed imposition of a tax penalty under former I.R.C. § 6661(a). The Karpas argued that the § 6661(a) tax penalty for substantial understatement of tax liability, as applied retroactively to their 1984 return, was unconstitutional as violative of the ex post facto clause. Both parties moved for judgment on the pleadings, and the Tax Court...
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