May I know why Quickbook ignore GST 8% when issue credit note reverse previous invoice? Pls advise. Thanks.

Thanks for checking in with us, useraccounts48.

If you updated the GST rate from 7% to 8%, we'll need to manually enter them in QuickBooks Online (QBO), as well as your recurring transaction in QuickBooks. That said, you'll need to create a new tax rate in the program. Before we proceed, please take note of some reminders below: 

• Existing transactions that used the earlier rate remain unchanged unless you edit the transaction and specifically select a different GST rate.
• For recurring templates that use the changed component, new transactions created with the template use the new rate. Existing transactions created with the template and the earlier rate remain unchanged.
• The new rate will be available for new transactions entered after the Effective date. 
• If you create a new transaction dated before the set Effective date, the transaction uses the old rate. 
• If you create a new transaction but use dates in the past, the transaction uses the new rate. 

Once done, let's go ahead and create a new GST rate in QuickBooks. 

1. Go to Taxes.
2. Select Add tax. 
3. Choose What type of tax do you want to add?
4.  Enter all the information needed. 
5. Press Save once done. 

Once finished, you can modify the recurring transaction manually. Please visit this article for more details about recurring transactions: Edit a recurring template. 

Then, create a credit a credit note again to apply the new GST rate. If the same thing happens, let's access your account through an incognito window to rule out the possibility of a webpage issue. You can refer to these shortcut keys to open an incognito window in all supported browsers:

• Chrome: Ctrl+Shift+N
• Firefox: Ctrl+Shift+P
• Safari: Command+Shift+N

If it works, I recommend clearing your browser's cache so you can access QuickBooks with a clean slate. You can also use a different supported browser. When you run reports the data still shows for both rates (before and after) if there are transactions for both the rates in a particular period. 

That's it. Please don't hesitate to reach out here in the Community. If you have clarification about the tax rate in QuickBooks. Take care!