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B2B handling: collect VAT ID and send it to FastBill

Use Shopify’s built-in VAT ID field to collect VAT ID (USt-IdNr.) during checkout and send them to FastBill automatically

Updated today

Setup (1 min)

In Shopify Admin

  1. Settings → Checkout

  2. Company VAT number and

  3. set it to Optional

  4. Save

Important sidenote:

  • Shopify’s native Company VAT number field may require Shopify Tax for EU/UK VAT validation. Shopify Tax is free up to Shopify’s yearly sales threshold, but 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/customer data.

  • Optional workaround: in Tax services, Shopify also offers Basic Tax, which is free, and in some cases VAT ID collection can work with Basic Tax as well.

How it works after setup:

Step 1 – Customer enters VAT ID

The customer can simply enter their VAT ID during checkout, and Shopify validates it in real time.

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.

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