Hello there, TaylorHeating.
The option to change a non-taxable to taxable customers by batch isn't available in QuickBooks Online.
Once imported, we'll have to manually change them on your QuickBooks account. I'll show you how:
- From the Sales tab, select Customers.
- Click your customer's name.
- Select the Edit button.
- Go to the Tax info tab.
- Enter their exemption details.
- Click Save.
I've also added these links as your guide when tracking sales tax:
Let me know if there's anything that I can help. Have a great day!