System stopped charging sales tax on some items. All lines on invoice are marked as taxable. What could cause?

Hello there, KenatRD.

We've received similar cases or reports about invoices being marked as taxable. With this, I recommend contacting our support so they can add you to the affected users list.

Here's how:

1. Select Help at the top.
2. Click the Search tab, then choose Contact Us.
3. Select a topic or enter a brief description of your concern.
4. Hit Continue, then select Start a chat and Get a callback.

In the meantime, we can troubleshoot through some browser troubleshooting steps to isolate the issue.

To start, open your account in a private browsing window. This step can help identify if the issue is related to a cache-related problem. You can activate private mode using the following shortcuts:

• Google Chrome: Ctrl + Shift + N
• Safari 11 or newer: ⌘ + Shift + N
• Mozilla Firefox: Shift + Ctrl + P
• Microsoft Edge: Ctrl + Shift + N

In addition, you can consider checking this article to personalize and add specific info to your sales forms: Customize invoices, estimates, and sales receipts in QuickBooks Online.

Let me know if you need further assistance managing your invoices. I'm always here to help.