The BOND serves as a security deposit for customs duties and penalties paid by each import/export declarant. CBP requires ISF Filing to have a BOND before filing.
A single transaction bond specifically for one filing. This is suitable for importers to purchase if they have low annual transaction volume.
Regarding annual BOND purchased by importers/customs brokers/overseas freight forwarders. This BOND is valid for one year and can be used for multiple ISF filings. :
BOND of importers or customs brokers. For goods imported into the U.S., this BOND is preferred. If the importer or consignee has an annual BOND, use this BOND; if the consignee does not have an annual BOND.
The freight forwarder's C3 Bond can also be used for ISF filing. It can be used for both AMS and ISF filing. If the U.S. consignee does not have a BOND, the forwarder's own C3 Bond can be used
The cost vary among insurance companies, they are generally 0.5% to 1% of the insured amount as per below:
For imports to the U.S., prioritize using the U.S. consignee's annual BOND.
For goods transiting through the U.S., use your FF/NVOCC C3 Bond by entering in your own CBP Assigned Number for both "Importer of Record" and "BOND".