I understand that correct calculation of sales tax is crucial. Let me go ahead and assist you.

I'd like to ask if you've tried opening your account using other supported browsers? If you haven't yet, I suggest utilizing it to help isolate possible issues.

Below is the list:
 

• Google Chrome: version 78 or newer
• Mozilla Firefox: version 76 or newer. Note: To preview and print forms on Mac OS, you'll also need the Firefox PDF plugin.
• Microsoft Edge: version 79 or newer
• Safari: version 12 or newer (Mac only)
• Opera: version 68 or newer
• Samsung: version 10 or newer

Note: Internet Explorer is no longer a supported browser.

If the issue persists, I suggest contacting our QuickBooks Support team to have this further investigated and have this fixed as soon as possible.

If you still have questions about sales taxes in QuickBooks, you can always reply to this thread or post a new one. Take care and have a good one.