Section 847.603 - Date of present value and deficiency determinations(a) For determining the deficiency under § 847.604 , OPM will determine, under §§ 847.605 through 847.607 , the present values of future retirement benefits (with and without credit for the NAFI service) as of the first date on which inclusion of credit for the NAFI service will affect the rate of annuity payable.(b) Appendix A to this subpart contains a table in which the left column is a list of events for which inclusion of credit for the NAFI service will affect the rate of annuity payable and the right column indicates the date on which the deficiency will be determined.