What is a VAT Registration No. in Business Central?

The VAT Registration No. is the tax identification number stored on a customer, a vendor or your own company record and printed on Business Central documents.

The VAT Registration No. is the identifier a tax authority assigns to a business. In Business Central it is stored on the customer card, on the vendor card and in the company information for your own entity. It appears on sales and purchase documents and supports how a trading partner is treated for VAT, but it is a data field, not a calculation rule: the VAT amounts come from the posting groups.

On a customer or vendor card the field sits with the other invoicing details, and your own number is kept in Company Information, which you can reach with Alt+Q. Search for VAT Registration No. Formats to define the accepted pattern per country or region code. For EU counterparties there is a setup page for the EU VAT registration number validation service, and a VAT registration log that records the answers received.

You create vendor Muster Handels GmbH with Country/Region Code DE and VAT Registration No. DE123456789. Because a format exists for DE, Business Central checks the pattern when you leave the field, and it warns you if another record already uses that number. On the purchase invoice of 8 April 2026 for EUR 4,800, the number is stored with the document and printed on the document layout.

Format errors usually come from the country prefix: some formats expect the two letter code inside the field and some do not, so the same number is accepted on one record and refused on another. Setting the wrong Country/Region Code makes the check apply the wrong rule entirely. Validating an EU number confirms the number, not the address or the legal name, and Swiss numbers fall outside the EU service, so they are only checked against the format you defined.

Zentriq Document Capture reads the header data of a scanned vendor invoice, including the VAT number when it is printed, which helps confirm the document was matched to the right vendor before anything is created in Business Central. Keeping the field filled consistently also makes VAT extracts easier to reconcile, because records without a number stand out immediately in a list filtered on blanks.

Frequently asked questions

Related terms

• VAT Posting Setup, The Business Central matrix of VAT business and product posting group combinations that determines VAT rates, calculation types, and VAT accounts.
• Reverse Charge VAT, Reverse Charge VAT is a VAT calculation type where the buyer accounts for the tax instead of the vendor charging it on the invoice.
• Vendor (Supplier), A company or person from whom you purchase goods or services, represented as a Vendor Card in Business Central.
• Customer, A Customer is the Business Central master record for a buyer, holding the address, posting groups, payment terms and credit limit used on every sales document.
• E-Document, The Business Central framework for sending and receiving structured electronic invoices in formats such as PEPPOL BIS, XRechnung, and Factur-X.

How Zentriq helps

Zentriq's AI tools automate many of the manual processes around vat registration no. in Business Central. Learn about the Zentriq Agent or try Zentriq PunchOut to see how AI simplifies procurement in BC.