Required for goods valued at over $2,500 being imported into the United States, this document is a legal agreement that outlines and verifies that all required importing fees, duties, and taxes have been paid.
This is also called an import bond.
A customs bond is a form of insurance to protect the U.S. Treasury in the event an importer fails to pay the duties, taxes, and fines or fees incurred on their imports. Customs bonds are purchased from government-licensed surety companies (financial entities that specialize in these types of bonds).