My customers are ringing up tax exempt-how do I correct that. I have not changed in ever

I hope you're doing great today, @skinlikerissas.

I can walk you through how to make your customer exempted from sales tax in QuickBooks Online.

You'll need to remove the check-mark of the This customer is taxable box from your customer's profile. This way, he will be exempted from the taxes to any sales transactions.

Know that the changes will reflect on your previous and future transactions. If you happen to have a negative balance for this customer, you can just issue a refund.

To remove the taxable mark:

1. Select Sales from the left menu, then Customers at the top.
2. Choose a name of the customer.
3. Select Edit at the top.
4. From the Tax Info tab, remove the check-mark on the "This customer is taxable" checkbox. 
5. Select Save.

You can also run the =Customer Contact List report and customize it to determine if a customer is taxable or not.

Let me show you how:

1. Go to Reports and run the Customer Contact List report.
2. Click the Small Gear icon, then check the Taxable box.
3. Select Run report.

To learn more about modifying sales tax in QuickBooks Online, you can always read through these great links:

• Edit sales tax rate in QuickBooks Online
• Default customer sales tax rate in QuickBooks Online

Should you have any follow-up questions or concerns, don't hesitate to post again here in the Community or leave a comment on this thread. Take care and have a good one.