19 U.S.C. § 1520: Refunds and errors

Whenever it is ascertained on liquidation or reliquidation of an entry or reconciliation that more money has been deposited or paid as duties than was required by law to be so deposited or paid. Whenever it is determined in the manner required by law that any fees, charges, or exactions, other than duties and taxes, have been erroneously or excessively collected. Whenever money has been deposited in the Treasury on account of a fine, penalty, or forfeiture which did not accrue, or which is finally determined to have accrued in an amount less than that so deposited, or which is mitigated to an amount less than that so deposited or is remitted. Prior to the liquidation of an entry or reconciliation, whenever an importer of record declares or it is ascertained that excess duties, fees, charges, or exactions have been deposited or paid. The necessary moneys to make such refunds are authorized to be appropriated annually from the general fund of the Treasury. a written declaration that the good qualified under the applicable rules at the time of importation; copies of all applicable certificates or certifications of origin; and such other documentation and information relating to the importation of the goods as the Customs Service may require. take effect on the date on which the USMCA enters into force [ July 1, 2020 ]; and apply with respect to a good entered for consumption, or withdrawn from warehouse for consumption, on or after that date. the amendments made by subsection (a) to section 520(d) of the Tariff Act of 1930 ( 19 U.S.C. 1520(d) ) shall not apply with respect to the good; and section 520(d) of such Act, as in effect on the day before that date, shall continue to apply on and after that date with respect to the good.”