What you need to do to ship postal to the U.S.
Saint Lucia Postal Service has worked with Zonos to offer the Zonos app as a fast, easy way for casual shippers to continue shipping to the U.S. while meeting the new requirements. Saint Lucia Postal Service is available in the Zonos app starting March 16, 2026.
Use the Zonos app for the retail counter
- Anytime you ship something under $2,500 USD to the U.S. via Saint Lucia Postal Service, use the Zonos app to pay duties upfront.
- When you drop your package off at the post office, show them the Declaration ID or QR code from your confirmation page.
- When the post delivers your item to the U.S. recipient, they will not be asked to pay duties at the time of delivery.
How much does it cost?
There are no subscription costs.
There is a postal clearance fee charged per shipment, which is clearly calculated and shown alongside the duty calculation in the app.
Watch the video tutorial
Watch how to quickly prepare your package and pay U.S. duties using the Zonos app. No subscription required.
Step-by-step
Download the app and create an account
Download the Zonos app to use when shipping to the U.S. There are no subscription costs—just pay as you go. The app will only prompt for duty payment (and include a clearance/processing fee) when you use it to ship an item to the U.S.
Enter your item info (or just snap a photo)
Snap a single photo that includes all of the items being shipped, or add multiple photos. Alternatively, add your item information manually. If you do not know the HS code, don't worry—the app will automatically classify your items and supply the HS code.
Let AI magically suggest complete customs information
Zonos' patent-pending AI tools automatically suggest required customs information, saving everyone time and streamlining processes. Shippers simply review the suggested information and make any adjustments needed.
Pay duties
The app will automatically calculate the applicable duties and postal clearance fees, and prompt for payment. Payment can be made directly in the app and is processed in the local currency. Duty payments made via the Zonos app are guaranteed—no additional duties will be charged to you or the recipient.
Show proof of payment
With duties prepaid, shippers can now ship their package to the U.S.. To show proof of payment, simply show the declaration ID to the postal clerk.
Zonos is the trusted leader in cross-border technology.
For more than 16 years, we've been powering international commerce by classifying products with HS codes and calculating duties and taxes with accuracy and reliability. Today, our technology supports some of the world's largest brands, logistics providers, and thousands of ecommerce businesses.
Our mission has always been to increase trust in cross-border trade by making cross-border simple, transparent, and compliant. From APIs that integrate directly with custom setups to checkout experiences that make duty and tax collection easy for anyone, Zonos ensures international customers have good delivery experiences, building your brand in the process.
Frequently Asked Questions (FAQs)
Additional information is available in our Zonos app user guide.
Keep shipping to the U.S. with Saint Lucia Postal Service + Zonos
As of August 29, 2025, a U.S. executive order requires duties to be paid on all shipments before clearing into the U.S. As of July 24, 2026, the duty prepayment threshold for postal shipments has risen from $800 to $2,500 USD. If you're shipping parcels under $2,500 USD from St. Lucia to the United States using Saint Lucia Postal Service, you must prepay duties before your parcel crosses the border. Saint Lucia Postal Service has partnered with Zonos to offer the Zonos app as a way to pay U.S. duties on postal shipments.