A protest is the importer's formal objection to a CBP decision on an entry, filed on CBP Form 19 under 19 USC 1514, within 180 days after the date of liquidation. The protest is the only way to challenge the liquidation: the classification, the value, the rate, the origin, or any other decision CBP made on the entry. It is filed electronically in ACE, it must state the specific decision being protested and the grounds, and it must be filed on time, because a late protest is not a protest. It is a letter CBP will deny. The 180-day window is the most important number in the protest process, and the importers who miss it are the ones who learn about it from a denied claim.
What a protest can and cannot do
A protest can challenge any decision CBP made on the entry: the classification, the value, the rate of duty, the country of origin, the application of a 9903 line, or the denial of a preference claim. It cannot challenge a decision CBP has not made yet, and it cannot be used to protest a liquidation that has not happened. The protest is filed after liquidation, not before, and the 180 days run from the liquidation date, not from the import date. An importer who files before liquidation has filed too early. An importer who files after 180 days has filed too late.
The protest must be specific. CBP Form 19, under 19 CFR 174.12, requires the importer to identify the entry, the decision being protested, and the grounds for the protest, with enough detail for CBP to understand the claim. A protest that says the duty is wrong, without saying which decision is wrong and why, will be denied. A protest that cites the correct classification, the correct value, or the correct 9903 line, with the ruling or the regulation that supports it, has a chance. The grounds are the protest. Without them, the form is just paper.
And a protest is not the only remedy. If the entry has not yet liquidated, the importer can file a post-entry amendment, correcting the entry before CBP acts on it. If the entry has liquidated and the protest is denied, the importer can seek further review or take the case to the Court of International Trade. But the protest is the first step, and it is the step that preserves the right to take the later ones. An importer who does not protest cannot go to court, because the court requires exhaustion of administrative remedies, and the protest is the remedy.
The 180-day window, and how importers miss it
The window is 180 days after the date of liquidation, and the date of liquidation is the date CBP posts the liquidation notice, not the date the importer receives it. The importer who waits for the paper notice has already lost days, and the importer who does not monitor the liquidation status in ACE will not know the window has opened until it is half gone. The discipline is to check the liquidation status of every entry, every week, and to calendar the protest deadline the day the liquidation posts.
The most common way to miss the window is to discover the error late. An importer who finds a classification error during an internal audit, six months after liquidation, has no protest remedy left, and the only remaining option is a prior disclosure or a voluntary tender, neither of which recovers the overpaid duty. The error was discoverable at liquidation, and the importer who did not review the liquidation in time has lost the right to challenge it. The review should happen at liquidation, not at audit.
And the window is per entry, not per importer. Each entry liquidates on its own date, and each has its own 180-day window. An importer with a hundred entries has a hundred deadlines, and the ones that matter are the ones where the duty is wrong. The importer's job is to know which entries are wrong, which requires reviewing the liquidation against the entry as filed, and to file the protest on the ones that are, before the window closes.
Filing the protest so it survives
File in ACE, on CBP Form 19, with the entry number, the liquidation date, the decision being protested, and the grounds, stated specifically. Attach the supporting documents: the ruling, the regulation, the invoice, the classification analysis, whatever supports the claim. And request further review if the claim is novel or the amount is significant, because further review puts the protest before a more senior reviewer and preserves the record for court. A protest that does not request further review is a protest that will be decided at the port, by the same office that made the decision being protested.
Then track it. A protest can take months or years to decide, and the importer should monitor its status in ACE and respond to any request for additional information promptly, because a protest that goes unanswered is a protest that gets denied. And keep the records: the protest, the supporting documents, the CBP response, and the decision, because if the protest is denied and the importer goes to court, the court will review the administrative record, and the record is what the importer filed.
Frequently asked questions
What is a customs protest?
A formal objection to a CBP decision on an entry, filed on CBP Form 19 under 19 USC 1514, within 180 days after liquidation. It is the only way to challenge the liquidation: the classification, the value, the rate, the origin, or any other decision CBP made.
How long do I have to file a protest?
180 days after the date of liquidation, which is the date CBP posts the liquidation notice, not the date the importer receives it. A late protest will be denied. Importers should check liquidation status in ACE every week and calendar the deadline the day liquidation posts.
What must a protest include?
The entry number, the liquidation date, the specific decision being protested, and the grounds, with enough detail for CBP to understand the claim. A protest that says the duty is wrong without saying which decision is wrong and why will be denied.
What if my protest is denied?
The importer can seek further review or take the case to the Court of International Trade. But the protest is the first step, and it preserves the right to take the later ones. An importer who does not protest cannot go to court, because the court requires exhaustion of administrative remedies.