To ensure smooth customs clearance for international orders, sellers must provide the appropriate tax identification number based on the destination market. Merchize currently supports the following tax information types:

• IOSS: For orders shipped to the European Union (EU)
• VOEC: For orders shipped to Norway
• UK Tax: For orders shipped to the United Kingdom

Sellers can configure tax information at either of the following levels:

• Store level – applies automatically to all eligible orders within the store.
• Order level – applies to individual orders, including orders imported from external platforms.

Note: Tax Information settings are only available for stores with Auto Fulfillment by Merchize enabled.

Configure Tax Information for an Entire Store

Tax information configured at the store level will be applied automatically to all orders shipped to the EU, Norway, or the United Kingdom.

1. Navigate to Home → Settings → Fulfillment.

2. Locate the Tax Information section.

3. Enter the appropriate tax number in the corresponding fields:

• • IOSS
  • VOEC
  • UK Tax

4. Ensure the entered values meet the following requirements:

IOSS: 

• Must begin with the prefix IM
• Maximum length: 12 characters
• Must not contain spaces or special characters
• Example: IM7807000742

VOEC Requirements

• Maximum length: 7 numeric characters
• Must not contain spaces or special characters
• Format example: 2021137

UK Tax Requirements: No character limit

5. Click Save to apply the changes.

Update Tax Information for Individual Orders

This option applies to orders that are:

• Created manually
• Imported via CSV
• Imported via API
• Synced from external platforms

1) Update During Manual Order Creation

When creating an order manually, enter the tax information in the Tax Information section.

The system will automatically validate the entered tax number based on the order’s destination address.

2) Update from the Order Details Page

1. Navigate to Home → Orders.
2. Open the order that requires an update.
3. Locate the Tax Information section (IOSS, VOEC, or UK Tax) in the right-hand sidebar.
4. Enter the appropriate tax number.
5. Save the changes.

3) Update via CSV Import or API

When importing orders through CSV files or API, sellers can include tax information directly in the import data.

Requirements

• Tax information must be included in the imported order data.
• Tax values must follow the required format for the destination country.

If the provided tax information does not match the required format, the system will return the following error message: Invalid tax format for [country]

Note: Tax information can only be modified before the order is sent to FFM (Fulfillment). Once the order has been transferred to FFM, the tax information is locked and can no longer be changed.

Important Notes

• If no IOSS number is provided for EU orders, VAT may be charged at customs clearance, and the recipient may be required to pay additional fees.
• An IOSS number consists of up to 10 digits following the IM prefix.
• VOEC numbers are applicable only to orders shipped to Norway.
• Tax information cannot be edited after an order has entered FFM status.
• The Tax Information feature is available only for stores with Auto Fulfillment by Merchize enabled.