Let's perform some troubleshooting steps to help automate taxes when managing invoices, Mandi6630.
Sometimes, stored cache files can cause interruptions or data damage to your QuickBooks app. To help rectify these issues, let's reset the app data to refresh your device and set it to its default state. Refer to these steps:
For iOS
- Go to Settings and tap General.
- Click iPhone Storage, then select the QuickBooks Online app.
- Tap Offload App. This will free up the storage without deleting your app's documents and data.
For Android
- Go to the Menu ☰ icon and tap More Options ⋮.
- Click on Settings, then Refresh Data.
- Select YES to confirm.
I'm also including the screenshots below for reference when GST taxes are automatically added during invoicing. Please note that I'm using an iOS device, and these steps also work effectively on an Android mobile.

Once done, re-open the app and log back into your account. Here’s an article that will guide you on how to get the most up-to-date information: See your latest data in the QuickBooks Online app.
However, if the same thing happens, I recommend using the web browser available on your mobile device. This way, you can efficiently continue managing your invoices.
Additionally, check out this article to help you track customer-paid invoices: Record invoice payments in QuickBooks Online.
I'll be of any assistance if you have further queries or questions when tracking sales and taxes. Just let me know below. Have a good one.