I use quickbooks online on a desktop no issues. When i am on my mobile or tablet i can raise an invoice but i am unable to add vat /sales tax what am i doing wrong please

I appreciate you taking the time to raise this matter with us, @colinbland. Let's work together to resolve this issue and get you back on track. By performing some troubleshooting on your QuickBooks Online application, you can successfully add your VAT/sales tax.

To start, please check if your QBO mobile app is up to date by visiting the Play Store or App Store. Once you've confirmed it's updated, you can refresh the app data so you can see the newest information added to your account. Here are the steps you can follow to do this.

If you're on an iOS device:

1. Navigate to Settings, then tap on General.
2. Go to iPhone Storage and select the QuickBooks Online app.
3. Choose Offload App.

If you're on an Android device:

1. Open the Menu ☰, then tap on More Options ⋮.
2. Select Settings, followed by Refresh Data.
3. Tap YES to confirm.

For more troubleshooting guides, I recommend checking this article: Use the QuickBooks Online desktop.

If the problem with the images continues, please proceed in uninstall and reinstall the QBO mobile app. Before you do this, ensure you have backed up all your essential data.

If you have further inquiries related to your QuickBooks Online Desktop app, please reply in the thread below, and we'll get back to you immediately. Best wishes!