20 C.F.R. § 229.58 Rounding of overall minimum amounts.
Title 20 - Employees' Benefits
The overall minimum amount for each beneficiary which is not a multiple of $0.10 is rounded to the next lower multiple of $0.10. After reducing each beneficiary's share for other benefits, if the result is not a multiple of $1.00 it is rounded to the next lower multiple of $1.00.
Title 20: Employees' Benefits
PART 229—SOCIAL SECURITY OVERALL MINIMUM GUARANTEE
Subpart F—Computation of the Overall Minimum Rate
§ 229.58 Rounding of overall minimum amounts.