Hi there, AGordon.
Thanks for joining us in this thread. I'm here to share a few details about entering discounts in QuickBooks Desktop.
When using the Cash method, it is beneficial in terms of tracking how much cash you received at any given time. If you've applied a discount to the customer's payment transaction, the amount will probably show up on your Profit and Loss Report.
Otherwise, the discounted amount will show up on the report using the Accrual method if you've applied a discount on the invoice.
You can check out this article that will give you detailed information with handling cash basis sales tax.
That should do it. Please leave a comment below if you have further questions. I'll get them answered for you.