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Add IOSS registration information to your company profile

This article applies to:AvaTax

The Import One-Stop Shop (IOSS) is an EU VAT registration system that requires sellers to apply VAT when selling goods to a buyer in an EU member state. Businesses that are not based in the EU may be required to appoint an EU-established IOSS intermediary. Add IOSS registration information to your AvaTax company profile to ensure accurate VAT calculations.


Need help with IOSS VAT registration?

Contact your Avalara Account Manager for help registering for IOSS. Registrants can trade into all EU member states with a single VAT registration. Learn more


Before you begin 

Obtain your IOSS registration number by registering your business on the IOSS portal of any EU member state.

Enhanced VAT Calculations must be enabled on your account in order to enter an IOSS number. Contact your Account Manager to learn more about this feature.


  1. In AvaTax, go to Settings > Company Details.
  2. Enter your IOSS Registration Number.
    • If you're a non-EU businesses or facilitating marketplace that's appointed an EU-resident intermediary, select I have appointed an IOSS-registered intermediary
  3. Select Save.

AvaTax will calculate VAT in the appropriate EU countries.

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