To create a VAT compliant invoice:

Step 1: Visit Setup > Location Setup.
Step 2: Select the location at which you want to update your invoice.
Step 3: Click on Printer & Peripheral Settings Print Settings and click Edit against your Invoice Template.
Step 4: Under General Fields > General Settings, override the Title Label field with "Tax Invoice".
Step 5: Under Header, update your header with your address details and Tax Registration Number.
Step 6: If you want to display details on your invoice in the local language, simply edit the required fields with the language translations.
Step 7: Click Save.