If you don’t declare something at customs and a CBP officer finds it, expect the item to be seized on the spot, a fine equal to its full retail value, and a note in your file that will slow every future border crossing. In serious cases — deliberate concealment, large amounts of cash, drugs, or commercial-scale smuggling — the consequences escalate to federal criminal charges carrying up to 20 years in prison. What actually happens in your case depends on what you failed to declare, how much of it there was, and whether the officer believes you were trying to hide it.
What Happens at the Border
The first thing that happens is questions. An officer who spots something missing from your Form 6059B will ask what it is, where you got it, and why it wasn’t listed. From there, officers can search your luggage, your belongings, and your person. CBP has broad authority to seize property whenever an officer has reasonable cause to believe a customs law has been violated.1eCFR. 19 CFR Part 162 Subpart C – Seizures The undeclared items are taken, and you receive a seizure receipt before you leave the airport.
If you don’t contest the seizure or pay the associated fine, the goods are eventually forfeited to the government permanently. Items that fail health or agricultural inspection are destroyed outright. Once property has been forfeited, you have no further claim to it.
Fines for Undeclared Merchandise
The baseline penalty is simple and painful: CBP can seize the undeclared goods and fine you the full retail value of what you didn’t list.2Office of the Law Revision Counsel. 19 USC 1497 – Penalties for Failure to Declare Skip declaring $3,000 in watches and you can lose the watches and owe another $3,000 on top. For undeclared controlled substances, the penalty is $500 or ten times the value, whichever is greater.
A separate statute governs false statements and fraudulent paperwork, and the penalty depends on how CBP grades your conduct.3Office of the Law Revision Counsel. 19 USC 1592 – Penalties for Fraud, Gross Negligence, and Negligence Negligence can cost up to twice the duties the government lost, or up to 20% of the dutiable value if no duties were actually affected. Gross negligence pushes that to four times the lost duties, or 40% of the dutiable value. Fraud allows a penalty up to the full domestic value of the merchandise, regardless of whether any duties were owed. None of these carry jail time on their own, but they can be assessed even when the item was duty-free. A false statement on the form is enough.
Undeclared Cash Over $10,000
Cash gets treated differently from goods, and the outcome is often worse than travelers expect. Federal law requires anyone moving more than $10,000 in currency or monetary instruments into or out of the country to report it.4GovInfo. 31 USC 5316 – Reports on Exporting and Importing Monetary Instruments The threshold is per person, and there is no legal ceiling on how much you can carry. You just have to report it.
If you don’t, the entire amount is subject to seizure and forfeiture. Not the portion over $10,000. All of it.5GovInfo. 31 USC 5317 – Search and Forfeiture of Monetary Instruments Actively concealing the money — sewing it into clothing, hiding it inside luggage — turns the case into bulk cash smuggling, which carries up to five years in federal prison.6Office of the Law Revision Counsel. 31 USC 5332 – Bulk Cash Smuggling Into or Out of the United States
Food, Plants, and Agricultural Items
This is where honest travelers most often run into trouble. A piece of fruit from the plane, a homemade sausage from a relative abroad, seeds from a market — all of it must be declared, even if you assume it’s harmless.7U.S. Customs and Border Protection. Bringing Agricultural Products Into the United States Most fresh fruits and vegetables, meats, and soil are outright prohibited.8U.S. Customs and Border Protection. Bringing Food Into the U.S.
Civil penalties for failing to declare a prohibited agricultural product can reach $1,000 for a first non-commercial offense. Commercial quantities get hit far harder. Under the Plant Protection Act, individual penalties can reach $50,000 per violation, with an aggregate cap of $500,000 for non-willful conduct or $1,000,000 when the conduct is willful.9GovInfo. 7 USC 7734 – Penalties for Violation Initial violations by individuals not acting for monetary gain are capped at $1,000. The reason the numbers get so large is that one pest or plant disease introduced through undeclared food can devastate U.S. agriculture.
When It Becomes a Criminal Case
Civil fines cover carelessness. Criminal charges enter the picture when CBP believes the evidence shows deliberate fraud, concealment, or importation of prohibited items like narcotics or weapons.
Smuggling goods into the United States is a federal felony. Anyone who knowingly imports merchandise that should have been declared, or fraudulently brings in goods contrary to law, faces up to 20 years in prison.10Office of the Law Revision Counsel. 18 USC 545 – Smuggling Goods Into the United States Individual fines can reach $250,000.11Office of the Law Revision Counsel. 18 USC 3571 – Sentence of Fine The goods themselves, or their equivalent value, are forfeited. Prosecutors don’t have to prove you were the one who physically smuggled the items; possessing goods imported contrary to law is treated as sufficient evidence unless you can explain it.
Lying to a customs officer is a separate crime. Making a false statement to any federal agent — which includes checking “no” on a declaration form when the truthful answer is “yes” — is punishable by up to five years in prison, or up to eight if the statement relates to terrorism.12Office of the Law Revision Counsel. 18 USC 1001 – Statements or Entries Generally In practice, CBP tends to save criminal referrals for intentional concealment, repeated violations, or contraband, rather than an honest mistake about a souvenir.
How to Contest a Seizure or Fine
You are not stuck with what CBP hands you at the airport, but the clock starts immediately. For seizures, you have 30 days from the date you receive the seizure notice to file a petition for relief. For penalties, the window is 60 days.13eCFR. 19 CFR Part 171 Subpart A – Application for Relief Miss those deadlines and you lose the right to petition.
The petition goes to a CBP Fines, Penalties, and Forfeitures Officer, who has authority to reduce or cancel the penalty entirely if the facts support it. It doesn’t need to follow a specific format, but it must describe the property involved, the date and place of the violation, and the facts you’re relying on for relief.14eCFR. 19 CFR 171.1 – Petition for Relief Be truthful in the petition itself; a false statement inside it can trigger prosecution. If your petition is denied, you can file a formal protest within 180 days of the decision, and after that the next step is federal court.15Office of the Law Revision Counsel. 19 USC 1514 – Protest Against Decisions of Customs Service
What It Costs You After the Airport
Even after the fine is paid, the record stays. CBP’s databases keep customs violations on file, and travelers with prior violations get flagged for secondary inspection on future entries. For something that began as a $300 agricultural fine, the accumulated hours in secondary over years of travel often become the real cost.
Trusted traveler status is one of the first casualties. Global Entry, NEXUS, SENTRI, and TSA PreCheck memberships can be revoked over a customs violation, and CBP has stripped Global Entry from travelers caught with undeclared merchandise on the theory that expedited programs run on trust.16U.S. Customs and Border Protection. Global Entry Members Violate CBP’s Trust After Officers Catch Them With $36k in Undeclared Merchandise at Dulles Airport You can file a reconsideration request through the Trusted Traveler Programs website with documentation and an explanation to the CBP Ombudsman, but reinstatement is not guaranteed.17U.S. Customs and Border Protection. Trusted Traveler Application Denial
Non-citizens face the steepest consequences. Customs violations involving fraud or smuggling can render a person inadmissible to the United States. A visa holder can have the visa revoked, and travelers relying on the Visa Waiver Program can be turned around at the border on future trips. CBP screens criminal, customs, immigration, and agricultural violation histories for every arriving traveler,18U.S. Customs and Border Protection. Trusted Traveler Program Denials and a single failure to declare can shape every trip that follows.