Displaying the company's VAT number on the invoice is a straightforward process you can achieve in just a few simple steps, truenorthcarrie.
To show the VAT on your invoice template, you need to make sure the VAT Registration No is selected. Let me walk you through the process.
- Go to the Gear icon at the upper right corner and choose Custom form styles under Your Company.
- Find your invoice template and click on Edit under the Action column.
- Go to the Content tab.
- Tap the first part of the invoice template.
- Under Display, put a checkmark on Vat Registration No.

- Once done, click Done.
To personalise and add specific info to your sales forms, check out this article: Customise invoices, estimates, and sales receipts in QuickBooks Online.
I'm adding these materials for more hints about the VAT feature in QBO:
I'm still open to your replies, please let me know if you need further assistance setting up VAT or managing invoices. I'll be here to help you.