Penalty for improper importation: tiered sanctions for dealing with confiscable goods and value or duty misstatements. Section 112 fixes penalties for acts or omissions rendering goods liable to confiscation and for dealing with goods known or reasonably believed to be confiscable. Penalties vary by category: prohibited goods, dutiable goods (other than prohibited goods) with a duty-based sanction subject to a statutory proviso reducing penalty where assessed duty and interest are paid within a specified period, and penalties for declared value exceeding actual value; overlapping breaches attract the highest applicable penalty. The duty-based clause was amended by finance legislation.