together with interest (at a reasonable rate) calculated from the termination date in accordance with regulations prescribed by the corporation. The liability under this subsection shall be due and payable to such trustee as of the termination date, in cash or securities acceptable to such trustee.
before provision for or deduction of Federal or other income tax, any contribution to any single-employer plan of which such person is a contributing sponsor at any time during the period beginning on the termination date and ending with the end of such fiscal year, and any amounts required to be paid for such fiscal year under this section. The corporation may by regulation require such information to be filed on such forms as may be necessary to determine the existence and amount of such pre-tax profits.
The corporation shall, as soon as practicable thereafter, determine whether there is liability resulting from the withdrawal of the substantial employer and notify the liable persons of such liability.
In addition to and in lieu of the manner prescribed in the preceding sentence, the corporation may also determine such liability on any other equitable basis prescribed by the corporation in regulations. Any amount collected by the corporation under this subsection shall be held in escrow subject to disposition in accordance with the provisions of paragraphs (2) and (3) of subsection (c) of this section.
and section 1368 (a) of this title shall be applied separately with respect to each controlled group. The corporation may also determine the liability of each such contributing sponsor and member of its controlled group on any other equitable basis prescribed by the corporation in regulations.
The report shall be filed within 6 months after the close of the plan year to which it relates. The corporation shall cooperate with the Secretary of the Treasury and the Secretary of Labor in an endeavor to coordinate the timing and content, and possibly obtain the combination, of reports under this section with reports required to be made by plan administrators to such Secretaries.