Timing of deduction of contributions

Except as otherwise provided in this paragraph, any payment described in paragraph (1) shall (subject to the last sentence of subsection (a)(1)(A)) be deductible under this section when paid.

Subparagraph (A) shall not apply (and subsection (a)(1)(A) shall apply) to any payments described in paragraph (1) which are paid to terminate a plan under section 4041(b) of the Employee Retirement Income Security Act of 1974 to the extent such payments result in the assets of the plan being in excess of the total amount of benefits under such plan which are guaranteed by the Pension Benefit Guaranty Corporation under section 4022 of such Act.

Subparagraph (A) shall not apply to any payment described in paragraph (1) which is made under section 4062(c) of such Act and such payment shall be deductible at such time as may be prescribed in regulations which are based on principles similar to the principles of subsection (a)(1)(A).