How do I save this credit card credit/ supplier credit when it keeps encountering an error while calculating tax? I cannot save this transaction with a basic tax code.

Hi hannah-wong-ides,

Welcome to the Community. Being able to record yur supplier credit is essential to keep your books balance. QuickBoooks Online is a great program that offers the ability to simply track sales and expenses. I'd be glad to point you in the right direction to record supplier credit.

This type of issue can be caused by browser cache and cookies as they can prevent the system from functioning effectively. I'd encourage you to refer to the following steps to complete some browser troubleshootings.
 

• Clear browser cache.
• Try in a private browser window.
• Use another browser type.
• Make sure you're using supported browsers.
• Turn off any ad and popup blockers temporarily.
   

If the steps provided above don't work, I recommend that you contact our customer support team as they can have a closer look at how to resolve this. Here are some options available to reach out to our team.
 

• Schedule a Callback or start a Chat: click (?)Help in the upper right > type and enter "Contact support" into the QB Assistant > click Contact Us > explain your situation > click Let's Talk > choose Get a callback or Start a Chat.
• Social Media: Facebook, Twitter, in a private message.
   

Feel free to reach out if you have any questions, I'll be happy to help.