How do you change tax total to vat total on invoice?

Tax terminologies depend on what is used in your region, naglememorials.

Changing the Sales Tax into VAT in QuickBooks Online (QBO) is not an option. It works as designed and is dependent on your location's tax system. With that, QBO automatically calculates your tax according to your region's tax regulations.

Furthermore, your QBO is using Sales Tax because it's the default terminology in your region. It functions similarly to VAT, which calculates the taxes for every sale your business makes.

You may also utilize the Tax Liability report in QBO to check and review the total amount of sales tax you owe and need to pay. For a complete reference, kindly click this article: Check how much sales tax you owe in QuickBooks Online.

You can always reply to this thread should you have additional concerns with your sales tax in QuickBooks. We'll ensure you're taken care of here in the Community forum. Have a great day.