I'm here to continue to help you in adding VAT to your invoices.
You'll need to enter your VAT registration number first once you set up your VAT. This should, thereafter, populate automatically on the invoices. To setup your VAT, please follow these steps:
From the left navigation bar, choose Taxes.
Click the Edit VAT drop down then click Edit Settings.
Make necessary changes then enter the VAT registration number.
You can also visit this link for more information about getting started with VAT: VAT getting started
If you're referring to the posting account, QuickBooks is a double entry accounting, therefore there will be one or more accounts that will be affected.
Once done, you can use this item when creating an expense or a bill transaction. Also, you might want to check your accountant about recording VAT payments in QuickBooks.
Stay around if you have other questions.
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