How do I add VAT to my invoices?

It's great to have you here, @ian11,

I can walk you through on how to enable VAT on your invoice transactions.

To get started, let's set up your account to  VAT, follow these steps:

1. Go to the Taxes menu from the navigation panel.
2. Tap the VAT tab and click on Set up VAT button.
3. Choose the beginning month of your current VAT period.
4. Fill out the Select Filing Frequency, VAT accounting, and VAT registration number fields.
5. Mark the Flat Rate Scheme (FRS), if your business is entitled to this.​
6. Click Save. 

Once set up, the system will create a VAT column on your invoices so you can assign the appropriate codes. Here's how it looks like:

To know more about the VAT feature in QuickBooks Online, check out these articles:

VAT: Getting Started

Set up and edit VAT settings, VAT codes and VAT rates

That should do it. If you need further assistance with VAT tracking, please know that I'm just a post away to help you. Have a nice weekend!