Important U.S. & International Customs Rules
Accuracy: Description & Value
It all starts with providing detailed content descriptions and accurate values. General categories won’t be acceptable and will only cause headaches for your shipment’s transit with delays or even worse, refused entry. Gifts, documents and other shipment types are not exempt.
It’s a good idea to review all your shipment descriptions when shipping to any international destination so that the description is in plain language and precise enough for customs authorities to be able to identify the goods. When in doubt, be specific with your product description and include quantities and an accurate retail value.
| ❌Vague Description | ✔️Specific & Detailed Description |
| Apparel | Men’s shirt, Lingerie, Girl’s vest, Boy’s jacket |
| Gifts | Scented candle, remote-controlled car, cashmere scarf |
| Handcraft | Describe the type: handcraft vase porcelain, handcraft beaded plastic necklace |
Shipment Line Items
If you ship multiple items in one package, ensure to add each item on a separate line. For example: 1 men’s tshirt; 2 baseball caps
If you import shipments using our CSV template, reference this article that provides details on how to import multiple items easily with our advanced CSV template.
With the recent customs regulations put in place it’s important that you include specific information about your shipment. This makes sure that there are no delays or even worse refused or returned packages.
Country of Origin (COO)
The Country of Origin refers to where a product was manufactured or produced. This designation is essential for determining whether duties or taxes apply when the item is imported, as well as the applicable rate. Different countries have varying duty rates—some may be higher, while others may not have any. As of February 2025, shipping regulations require all shipments crossing the border to include the Country of Origin (COO) for each product. This requirement applies to all shipments destined for the U.S. and other international locations. If you would like to learn more about how to determine your product’s COO, consult our support article.
Harmonized Tariff Schedule (HTS) Codes
Harmonized Tariff Schedule (HTS) codes are 10-digit numerical codes that help identify the goods in your package and determine the applicable taxes and duty fees for shipments. These codes are required for shipments destined for the U.S. for customs purposes.
As of February 2025, all shipments heading to the U.S. originating from China or Hong Kong will need to include an HTS code for border clearance.
In addition, HTS codes are required for all shipments using Tracked Packet USA, no matter the Country of Origin.
Need to find an HTS Code >> Chit Chats HTS Lookup Tool (available in English only)
Note: This tool should be used in conjunction with the official U.S. HTS resource in order to confirm the accuracy of the provided code.
Other tools to find HTS Codes
- Tariff Finder (HTS and HS codes)
- You may need to expand the subheader in order to see the 10 digit HTS code.
- Canada Post – Find a Harmonized System Code (HS and HTS codes)
- You will have to add the country of origin in order to find the HTS code after obtaining the HS code.
HTS Code Format
- 10 digits for each item in your shipment
Do you import your shipments using the Chit Chats CSV? Find instructions on how to import HTS codes here.
Do you import shipments with a store integration? Find details on how HTS codes can be imported based on your ecommerce platform.
Harmonized System (HS) Codes
Harmonized System (HS) Codes are important because customs uses this as a reference to identify the goods in your package. The Harmonized System is a standardized numerical method of classifying traded products for customs processing. This allows shipments to move smoothly through the network and help decrease the risk of fraud and security threats.
As of March, 2025, all international shipments will require accurate HS coding.
Need to find an HS Code?
- Tariff Finder (HTS and HS codes)
- Canada Post – Find a Harmonized System Code (HS and HTS codes)
HS Code Format
- minimum 6 digits for each item in your shipment
- additional digits depend on destination of the shipment
Do you import your shipments using the Chit Chats CSV? Find instructions on how to import HS codes here.
Do you import shipments with a store integration? Find details on how HS codes can be imported based on your ecommerce platform.
Customs Tax Reference Numbers
Certain countries mandate customs tax reference numbers for importing shipments, specifically EU countries and the UK. Additionally, other regions, like Brazil, have similar requirements, where a CPF or CNPJ number is necessary. It is your responsibility to know whether or not your country of destination requires a tax reference number. Here are a few examples:
Import One-Stop Shop (IOSS)
- The Import One-Stop Shop (IOSS) was created as an optional program to facilitate and simplify the declaration and payment of the value added tax (VAT) for goods sold from a distance by sellers from either the European Union (EU) or from a non- EU country or territory.
Value Added Tax Identification Number (VAT)
- A Value Added Tax Identification Number or VAT Identification Number (VATIN) is an identifier used in many countries for value added tax purposes. Each country has a slightly different format for their VAT number system.
VAT on E-Commerce (VOEC)
- The VAT system for Norway. Similarly to the IOSS, it is used to declare the payment of the value added tax for goods sold from outside of Norway.
If you have an IOSS, VOEC, or VAT number simply provide this in the customs tax reference number field when creating your shipment. Reference numbers must follow the correct formatting. This ensures that the information is passed onto our partner carriers.
- Maximum of 20 characters
- Cannot content any special characters (i.e. -, !, #)
- Not necessary to include the words ‘IOSS’ ‘VOEC’ or ‘VAT’
The IOSS VAT Identification Number contains a total of twelve (12) alphanumeric characters in the following format of IMxxxyyyyyyz (reference USPS IOSS FAQ). On the other hand, VOEC numbers are 7 digit reference numbers. Examples of correct formats can be found here.
| Correct formatting | Incorrect formatting |
| IM5280008075 | IOSS VAT ID: IM5280008075 |
| GB375197855 | UK VAT ID: GB375197855 |
| DE356983735 | VAT number, 356983735 |
| IM3720000224 | Etsy IOSS IM3720000224 |
| IM3720000224 | IM3720000224 11.26 euros |
| IM2760000742 | IOSS # – IM2760000742 |
| 1234567 | VOEC NO: 1234567 |
Find more examples in our support resource, “What customs information do I need to provide?”
If the incorrect format is provided this can impact the delivery of your shipment (potential delays, the recipient may be asked to pay duties, shipment may be undeliverable).
Additional resources:
International shipments can be a breeze and we are here to help! Based on our shipping experience we recommend that you provide:
- detailed shipment descriptions
- HS codes for all international shipments
These tips will help get your packages to move efficiently through international borders. Based on what we’ve seen in the logistics industry providing HS/HTS codes will become a standard requirement for all shipments.
As always it is the sole responsibility of the shipper to ensure that shipment’s description is detailed and accurate. International shipping doesn’t have to be daunting. Our support staff is always available to help so contact us if you need guidance or have questions.