Hi @Kraknmobile,

I would also feel the same with the issue if I'm unable to turn off the automated sales tax feature. Allow me to chime in and help you with your tax concern in QuickBooks Online.

The sales tax button will only work if there are no transactions created in the account. Also, this issue happens when there are zero dollar transactions tied to a zero balance sales tax line item.

Affected users will need to review the transactions remove any sales tax entries or delete/void the invoices in question. Since you've mentioned that you don't collect sales tax and never have, I recommend contacting our QuickBooks Support Team.

One of them will assist you further with the sales tax issue. Our support for Plus, Essentials, Simple Start is available from 6 AM - 6 PM PT (Monday - Friday) and 6 AM - 3 PM PT (Saturday). For Advanced, any time, any day.

Here's how you can reach them:

1. Click the Help tab in the upper-right corner.
2. Go to the Assistant tab.
3. Click Get help from a human.
4. Choose Chat with us or Have us call you. 

I've attached a link you can check out to know more about how you can personalize your sales forms in QuickBooks: Customizing Invoices Within QuickBooks Online.

I'm just a post away if you have any other questions about disabling sales tax in QBO. Take care.