29 C.F.R. § 20.57 Accrual of interest.
Title 29 - Labor
Interest shall accrue from the date on which notice of the debt and the interest requirements is first mailed or hand-delivered to the debtor, using the most current address that is available to the agency.
Title 29: Labor
PART 20—FEDERAL CLAIMS COLLECTION
Subpart C—Interest, Penalties and Administrative Costs
§ 20.57 Accrual of interest.