7 Customs Clearance Mistakes That Cost Businesses Real Money

Most customs clearance problems are not caused by bad luck. They are caused by incomplete paperwork, wrong classifications, and assumptions that turned out to be wrong. Here are the seven mistakes we see most often — along with what to do instead.

Mistake 1: Wrong or Missing HS Code

The Harmonized System code tells customs what you are shipping. Use the wrong code and you may pay the wrong duty rate — sometimes higher, sometimes lower. Furthermore, using an incorrect HS code, even accidentally, can be treated as misdeclaration. The safest approach is to verify yours through the official US Harmonized Tariff Schedule before your first shipment of any new product.

Mistake 2: Undervaluing Goods on the Commercial Invoice

Customs authorities in most countries have access to market pricing databases. If your declared value is significantly below market value for the product, you will be flagged. Moreover, if it looks deliberate, you may face penalties and seizure. Always declare the actual transaction value.

Mistake 3: Incomplete Packing List

A packing list that does not match the commercial invoice — different quantities, different weights, different item descriptions — creates an immediate red flag at customs clearance. These two documents must align precisely. Check them against each other before the shipment leaves.

Mistake 4: Missing Country of Origin Certificate

Many trade agreements — including USMCA and various US free trade agreements — require a certificate of origin to qualify for reduced duty rates. Without one, you pay the standard duty rate. Consequently, if your goods qualify for preferential treatment, not having the certificate costs you money on every shipment.

Mistake 5: Ignoring Restricted and Prohibited Item Lists

Every country maintains a list of goods that are restricted or prohibited from import. These lists change, and they vary significantly by destination. Therefore, always check the destination country’s current list before shipping a new product type. The relevant US authority for exports is the Bureau of Industry and Security.

Mistake 6: Not Appointing a Customs Broker for Complex Shipments

A licensed customs broker is a specialist who manages the customs clearance process on your behalf. For routine shipments of simple goods, you may not need one. However, for commercial quantities, regulated goods, or any shipment where the duty liability is significant, a broker pays for itself quickly. In addition, a good broker catches documentation errors before they become customs holds.

Mistake 7: Booking Too Close to the Deadline

Customs clearance takes time — sometimes hours, sometimes days, depending on the shipment and the port. As a result, a shipment that was booked with no clearance buffer almost always misses its final delivery window. Book your freight with enough lead time that a two-day customs delay does not cost you a client or a retail slot. Read our full international shipping guide for a complete timeline breakdown.