I’m using the QuickBooks app on iPhone. On an invoice I’ll add multiple items. Then on one item it will cause the rest of the list to change to “no tax”.

Let's try refreshing your application's data, usereric-tapline.

Let me guide you how:

1. Tap the ☰ Menu icon.
2. Select Help & Feedback.
3. Tap Refresh Data and then Refresh.

Afterward, let's try adding multiple items again.

Also, if you want to reorder your inventory, you can check this reference: Reorder inventory or supplies from vendors.

Let me know how these steps work on your end. I'll be around to help you out!

Sadly it did not

Sadly it did not. When I make a list to an invoice and add this “corrupted” item it won’t allow me to add sales tax to any item on the list. The only way I found it will is if the corrupted item is on quantity I switch it to flat rate, save, back out and go back on the item. Then switch it back to quantity and it will allow sales tax. Then I go back and turn sales tax back on every other item on the list. 

I have to switch the “corrupted” item from quantity to flat rate, save, go back in and then change it back to quantity to allow me to add tax to it and every other item I wasn’t able to before.