With new invoice form I lost the cell to input location of sale for sales tax purposes, where can I input location of sale now?

I got you back, Jsn80. Let's find out where to enter your sales tax by location in QuickBooks Online.

First off, I recognize the changes between the old layout and the new design of our invoice, as QuickBooks aims to provide the most convenient experience they can offer.

Since you need to input your sales tax by location, we need to scroll down a bit from the invoice page and tap See the Math option. Once the left panel shows, it will let you modify or enter relevant details for your sales taxes. 

Here's a sample illustration below for additional reference:

I've got you this article that will help you set up, edit, or deactivate your sales taxes in the future: Set up your sales tax in QuickBooks Online.

If you need to make personalized sales forms with a new layout, refer to this page for the complete instructions: Customize invoices and estimates with the new design.

Please notify us again if you have other concerns with pulling up sales reports. We are here to lend a hand. Have a great day.