I have recently registered for VAT and just got my VAT number from HMRC how do i add this VAT number to my invoices?

I'm glad to know that you already got your VAT number from HMRC, @fdcarroll.

Adding your VAT number in the invoice is just a few clicks. And I'm happy to walk you through the detailed steps to accomplish this in your QuickBooks Online account. 

Here's how: 

1. Go to the Taxes tab on the left side. 
2. Click Edit VAT drop-down and choose Edit settings. 
3. Enter the number in the VAT registration box. 
4. Hit Save. 

Once done, the VAT number will auto-populate on your sales forms. You can create a sample invoice to see what it looks like. Refer to the screenshot below for your reference. 

Please visit the links below to learn how VAT is calculated in your invoices, configure tax codes, schemes, and other related issues:

• Set up and edit VAT settings, codes, and rates
• VAT: Getting started

• Customise invoices, estimates, and sales receipts in QuickBooks Online

Don't hesitate to leave a comment below if you have further questions about your taxes. I'm always here to help you. Take care, @fdcarroll.