20 CFR §726.306
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
Except as provided in § 726.307(c), if any person identified as potentially liable for the assessment does not, within 30 days after receipt of notice, contest the assessment, the Director's assessment shall be deemed final as to that person, and collection and recovery of the penalty may be instituted pursuant to § 726.320.