20 C.F.R. § 225.32 DRC's and the Special Minimum PIA.
Title 20 - Employees' Benefits
Delayed retirement credits cannot be added to the Special Minimum PIA. Delayed retirement credits can only be added to the regular PIA's used in computing the benefits outlined in §225.31.
Title 20: Employees' Benefits
PART 225—PRIMARY INSURANCE AMOUNT DETERMINATIONS
Subpart D—Delayed Retirement Credits
§ 225.32 DRC's and the Special Minimum PIA.