I can help you set up notifications for changes to employee tax codes within your system, Aimen.

If you've registered with the HMRC online service, notifications about tax code updates will be sent directly to your email inbox. You can check your junk or spam folders from there.

With that, log in to the HMRC portal and verify that all notice settings are enabled. Here's how:

1. Access the HMRC PAYE dashboard.
2. Navigate to the Messages section.
3. Select the Notice Preferences and then the Notice Options to enable notices by setting them to Yes.
4. Once done, any new notices will automatically update in QuickBooks.

Once this setup is completed, any new notifications regarding tax codes should automatically update in QuickBooks Online.

However, if the auto-updates don't occur, you'll have the option to manually adjust the tax codes for your employees within QuickBooks.

Furthermore, if you're unable to log in to the online service, I suggest reaching out directly to HMRC. They can provide support in activating notices to ensure updates on employee tax code changes are appropriately communicated.

Moreover, I'm including this guide to help you track and view your VAT info: Check how much VAT you owe in QuickBooks Online.

If anything comes to mind, please let us know your queries on this thread. I'll be around to provide further support. Stay safe!