Please note that the app currently supports collecting and handling the customer’s VAT ID. However, Company ID / registration number, Company address, Company name and local tax ID cannot be configured or handled at the moment.
Setup (1 min)
In Shopify Admin
Settings → Checkout
In the Customer information section, set Company VAT number to Optional
Save
Please note: Shopify applies the reverse charge to valid VAT numbers for eligible EU cross-border orders. VAT number validation at checkout requires Shopify Tax, which is free up to Shopify’s yearly sales threshold; after that, Shopify may charge a transaction-based fee. This is controlled by Shopify, not by our app: our app can only read and forward the VAT number once Shopify makes it available on the order or customer data.
How it works after setup:
Step 1 – Customer enters VAT ID
The customer can simply enter their VAT ID during checkout, and Shopify VIES-validates it in real time.
Please note: if VAT ID validation is not included in your selected tax service option, customers may still be able to submit any entered value, not only a VIES-validated VAT ID.
The Postal code (ZIP) and Country/region must be entered first for the VAT number field to appear:
Step 2 – VAT ID is saved to the customer
The VAT number is saved under Customer → VAT number
This works both for checkout orders and manually created admin orders.
Step 3 – We send the VAT ID to FastBill ✅
We send this VAT number to the invoicing system as part of the customer contact details, so it appears in the correct place on the document.
Legacy Address line 2 method (Deprecated)
There is also an older Address line 2 method.
This method is deprecated and should not be used as the default setup.
It still exists in the backend because some existing merchants use it.
Support can enable it if needed.
If both methods are enabled, the checkout VAT ID always wins when it is available.