Pub. L. 100-647, tit. I, sec. 1019
EFFECTIVE DATE.
SEC. 1019. EFFECTIVE DATE. (a) General Rule.—Except as otherwise provided in this title, any amendment made by this title shall take effect as if included in the provision of the Reform Act to which such amendment relates. (b) Waiver of Estimated Tax Penalties.—No addition to tax shall be made under section 6654 or 6655 of the 1986 Code for any period before April 16, 1989 (March 16, 1989 in the case of a taxpayer subject to section 6655 of the 1986 Code) with respect to any underpayment to the extent such underpayment was created or increased by any provision of this title or title II.