Error - Address cannot be changed as it changes the applied tax

Problem Statement

I tried to update the billing info (VAT number) on an invoice and got "Address cannot be changed as it changes the applied tax." How do I fix this?

Solution

Country and VAT registration number cannot be changed on an invoice after it is generated, because VAT is used for reverse charge and tax calculation.

Option 1: Update the VAT number at the customer level. New invoices will use the updated VAT number.

Option 2 (current-term invoices only): Void the invoice and regenerate it. Before regenerating, update the VAT number in the customer's billing information. See Void and regenerate an invoice and Limitations of voiding and regenerating.