The taxes field when writing cheques is suddenly empty and I am unable to add gst to my suppliers payment

Being able to process your vendor transactions without any issues is our goal, @SLAntiques.

Allow me to help you out so you're able to add your tax codes to the cheques. I have a couple of suggestions to resolve this problem. For now, try to open your account in a private web browser and create the checks from there. We need see if this is a caching problem.

Unexpected issues with the features in QuickBooks, like creating vendor or sales forms, are sometimes associated with the amount of data stored in the cache. This is because a regular browser will constantly overwrite itself and will not remove history unless done manually.

Private browsing will not save any history, so it's a great place to identify issues in the browser. Use these keyboard shortcuts to launch a new private window:

• Google Chrome: press Ctrl + Shift + N  
• Mozilla Firefox: press Ctrl + Shift + P
• Safari: press Command + Shift + N

If the problem doesn't come up, clear the cache to resolve browser issues in QBO. You can also use a different browser and see if the issue persists there.

Please come back here and update me with the result. I want to get this resolved for you and I'm here anytime. Have a good one!