UNDERWITHHOLDING.

SEC. 304. UNDERWITHHOLDING. No person shall be liable in respect of any failure to deduct and withhold under section 3402 of the Internal Revenue Code of 1954 (relating to income tax collected at source) on remuneration paid before January 1, 1977, to the extent that the duty to deduct and withhold was created or increased by any provision of the Tax Reform Act of 1976.