For purposes of IRC section 415(b), the "annual benefit" means a benefit payable annually in the form of a straight life annuity (with no ancillary benefits) without regard to the benefit attributable to after-tax employee contributions (except pursuant to IRC section 415(n)) and to rollover contributions (as defined in IRC section 415(b)(2)(A)). The "benefit attributable" shall be determined in accordance with Treasury Regulations ( 26 CFR 1.415(b)(2)(A)).
Ill. Admin. Code tit. 50, § 4440.160