; and (ii) each such amount as in effect for plan years beginning in the preceding calendar year. If any amount determined under this subparagraph is not a multiple of $1, such product shall be rounded to the nearest multiple of $1. (F) Definitions For purposes of this paragraph: (i) Small employer The term small employer means an employer who has 500 or fewer employees on the first day of the plan year. (ii) Multiple employer plan The term multiple employer plan means a single-employer plan maintained by more than one employer (as determined under section 210(a)). (iii) Single-employer pension insurance program funded percentage The term single-employer pension insurance program funded percentage for a fiscal year means the ratio (expressed as a percentage) of— (I) the value of all assets held by the corporation in any trust or revolving fund on the last day of such fiscal year available for the payment of basic benefits guaranteed under section 4022, to (II) the present value (as determined in accordance with section 303(h) without regard to paragraph (2)(C)(iv)) of the liabilities of the corporation attributable to such guaranteed benefits on the last day of such fiscal year. (iv) Unfunded vested benefits The term unfunded vested benefits has the meaning given such term in paragraph (3)(E)(iii), except that with respect to a CSEC plan (as defined in section 210(f)), such term means the excess of— (I) the plan’s funding liability (as defined in section 306(j)(5)(C)), determined by only taking into account vested benefits, over (II) the fair market value of plan assets for the plan year which are held by the plan on the valuation date. . (b) Individuals participating in more than one plan Section 4006(a)(3)(B) of the Employee Retirement Income Security Act of 1974 ( 29 U.S.C. 1306(a)(3)(B) ) is amended by inserting or paragraph (9) after subparagraph (A)(i) . (c) Conforming amendment Section 4006(a)(3)(A) of the Employee Retirement Income Security Act of 1974 ( 29 U.S.C. 1306 ) is amended in the matter preceding