How to Input VAT/IOSS Numbers Into Customs Forms

Starting July 1, 2021, all commercial goods destined for the European Union (EU) are subject to Value Added Tax (VAT). This applies to deliveries of any value, including those below 22 euros (estimated $26). To help online retailers manage this tax collecting process, the EU member countries created the Import One-Stop Shop (IOSS), an electronic portal for online retailers to comply with the new VAT rules. After registering for an IOSS account, you will receive an IOSS tax identification number which should be inputted on all Customs Forms for your packages.
First 90 Days – How is the IOSS Working?
Stamps.com Customer Care has been monitoring the deliveries to the EU very closely since July 1, 2021. Overall, most packages have included the new IOSS information and packages are being delivered. We have discovered some shippers are inputting VAT/IOSS information incorrectly in the Stamps.com software interface, which is creating unnecessary duty and tax bills for shipments.
Customer Care has also noticed many shippers are NOT inputting IOSS numbers on low value orders, which is now required. This action pushes the responsibility of delivery fees, duties and taxes to the package recipient. If the recipient does not want to pay these extra charges, the package will be returned to sender.
INSTRUCTIONS FOR INPUTTING VAT/IOSS NUMBERS INTO CUSTOMS FORMS USING STAMPS.COM
Stamps.com Software

1) From the “International” tab, input the delivery address and package details.
2) In the “Customs” section, please click on the “Edit Form”.
3) Input your IOSS tax identification number in the designated field. Finish by clicking “Add Item” (on far right side) and then “OK”
Stamps.com Website

#1 Input the international delivery address and select the carrier info for the label.
#2 In the “Contents” section, click on “Customs Form” button.
#3 Input your IOSS tax identification number in the designated field. Finish inputting the item description and click “Add item”.
Important information to remember:
- For orders being delivered to the United Kingdom, “IOSS #” field will be labeled “VAT #” in the Customs Form.
- If you are selling through a marketplace, such as eBay or Amazon, be sure to include that marketplace’s IOSS number in the Customs Form. If you do not, the receiving EU country will assume VAT has not been collected.
Learn more about the European VAT requirements that started July 1, 2021.
Don’t worry about IMI compliance with Stamps.com. Learn more
Frequently Asked Questions
How fast is Priority Mail Express International?
Delivery is made by the country's postal service in 3 - 5 business days, depending on the destination.
How fast is Priority Mail International?
Generally, it takes Priority Mail International six to ten business days. USPS hands off shipments at the border of the destination country before the local postal service completes the delivery.
How much does USPS First Class Package International® cost?
While price varies depending on weight and destination, rates for this service begin at $17 dollars.
UPS Worldwide Saver vs. UPS Worldwide Expedited: What is the speed comparison?
UPS Worldwide Saver is faster than UPS Worldwide Expedited, offering delivery by the end of the next business day to major business centers, compared to 2-5 business days for Worldwide Expedited. Worldwide Saver provides a more economical alternative to premium express services while maintaining quick delivery.
What are the UPS Worldwide Saver delivery times?
UPS Worldwide Saver guarantees delivery by the end of the business day, one day faster than UPS Worldwide Expedited. This service connects major business centers in over 220 countries and territories with time-definite delivery and customs clearance included.
What is DHL Express
DHL Express is a premium international shipping service that offers fast, time-definite delivery to over 220 countries and territories. It's designed for urgent packages, with door-to-door tracking, customs support, and express delivery options for businesses and individuals.
When using Priority Mail International, should I ship Flat Rate or by weight?
Flat Rate Envelopes are ideal for documents or small, dense items weighing 4 lbs or less, as they offer a single price based on the destination country. For items between 4 lbs and 70 lbs, or those that don't fit into the Flat Rate Envelopes, you'll need to ship by weight using your own packaging. It’s more affordable to use Flat Rate boxes if your item is under 20 lbs.
Why is it easier to ship internationally with Stamps.com?
Stamps.com makes international shipping easy by offering international services from USPS, UPS, and other carriers including GlobalPost. We make customs forms hassle free, so you can complete them online with ou guidance, and simply print to include with your international shipment.
Will my package be checked?
Yes. Your packages may be inspected to ensure compliance, as USPS is very strict about what items qualify for Media Mail.