Thanks for getting back with the Community, zenkiag.
 

If you've already performed the troubleshooting steps shared by ArielI, you'll want to be aware that QuickBooks supports the current and two previous versions of browsers. If you find that you're using an unsupported version, be sure to update it to its latest release. Steps for doing so can be found on the particular company's website.
 

In the event you've found no problems that could be causing this with your browser, you'll want to check the operating system and internet speed you're working with.
 

Here's our recommended operating systems and internet speeds:
 

• Windows PC: Windows 10, Intel Core i5 or comparable processor (2015 or newer) with at least 4 GB of RAM.
• Mac: OS X "Big Sur" 11.1 or newer.
• Internet connection: 3 Mbps or higher.

Here's our minimum requirements for operating systems and internet speed:
 

• Windows PC: Windows 10, Intel Core i3 or a comparable processor (2013 or newer) with at least 2 GB of RAM.
• Mac: OS X El Capitan 10.11 or newer.
• Internet connection: 1.5 Mbps.

If you meet each of our system requirements, but are still noticing sales taxes disappearing, I'd recommend using a different device and/or internet connection. If it continues happening on other devices and internet connections, you'll want to get in touch with our Customer Care team. They'll be able to pull up your account in a secure environment, conduct further research, and create an investigation ticket if necessary.
 

They can be reached while you're signed in.
 

Here's how:

1. Use the Help (?) icon.
   
   
    
2. Click Contact Us.
   
   
    
3. Enter a description of your situation in the What can we help you with? field, then hit Let's talk.
   
   
    
4. Select Start messaging or Get a call.
   
   

Be sure to review their support hours so you'll know when agents are available.
 

I've also included a detailed resource about system requirements for QuickBooks which may come in handy moving forward: System requirements
 

I'll be here to help if there's any additional questions. Have a lovely Thursday!