How Are Customs Duties Calculated?

When you receive a unexpected customs bill, it is natural to wonder how that final number was determined. The calculation process follows a specific formula based on international standards. Understanding how this works helps you avoid the confusion often seen when a package is stuck in customs and allows you to verify that the fees requested by DHL customs clearance are actually accurate.

Track Parcels

What It Means

Customs duty is a percentage of the total value of your imported goods, determined by the product's classification and its origin. The base formula is Duty Owed = Customs Value × Duty Rate. Many regions also apply import VAT or sales tax on top of this. If you are tracking a shipment and see a UPS import scan or a notification that UPS customs clearance is in progress, these fees are likely being assessed at that stage.

Discover more
Learn a Language
Get Food Delivery
Book Freight

Why It Happens

The calculation relies on the Harmonized System (HS) code to categorize goods, which ensures consistent tax application. Declared value serves as the base for these calculations, and discrepancies here often lead to a FedEx clearance delay or other carrier holds. Additionally, many shipments undergo security checks, and receiving a notification that a DHL shipment is undergoing security inspection is a standard part of the process before final duty assessments are finalized.

How Long It Lasts

Duty calculation usually occurs within 1-3 business days after arrival. While this is a standard procedure, it can be extended by USPS customs clearance delay issues or further documentation requirements. You can monitor the progress of your delivery status to see when DHL clearance processing is complete or when the carrier indicates that the FedEx international shipment release has occurred.

Get Food Delivery

Should You Be Concerned?

In most cases, the calculation is a routine systematic event. You generally do not need to be worried if the paperwork is accurate. However, if you see an update like DHL customs status updated, it is worth monitoring to ensure the process continues smoothly. If the bill is significantly higher than your expectations, it is worth verifying if the product was classified correctly.

Discover more
Compare Couriers
Browse Reference
Buy GPS Trackers

What You Can Do

To prepare, check your country's de minimis threshold and estimate costs before purchasing. If you are currently waiting on an international order, remain patient, as how long customs clearance takes can fluctuate based on volume. If you receive a bill you believe is incorrect, contact the carrier immediately with your documentation to request a review of the duties applied.

When to Contact the Carrier

Contact the carrier if:

  • You've received a duty bill and want a detailed breakdown of how it was calculated
  • You believe the declared value or product classification used for the calculation is incorrect
  • You want to estimate potential duties before your package arrives

Carrier contacts:

  • USPS: 1-800-275-8777
  • UPS: 1-800-742-5877
  • FedEx: 1-800-463-3339
  • DHL: 1-800-225-5345

Related guides:

ShipTrack Research Team

Discover more
Ship Packages
Shipping
Mail

Our editorial team specializes in researching and explaining  shipping terminology and carrier processes. We review carrier documentation, analyze tracking patterns, and monitor system changes to provide accurate, up-to-date information.

✓ Editorial review completedLast updated: July 15, 2026

Frequently Asked Questions