Hi, Account615. In QuickBooks Online (QBO) South Africa, it’s not possible to directly add VAT details to customer profiles. However, you can create custom tax rates that you can manually apply whenever you create a transaction for a client.

Here's how you can add tax rates: 

1. Go to the Tax tab and select Add tax.
2. Choose which type of tax rate you want to set up.
3. Enter the details of your tax rate.
4. Select Save when finished.

Feel free to access this article for additional guidance: How do I set up sales VAT rates and use them on forms? (International QBO).
 

If you have other questions, don’t hesitate to reach out in the comments. We're here for you.