After setting up a deal in Menu, click on the Calculate button. Hold down the CTRL key on your keyboard and simultaneously click on the payment amount in the Plan Payment row.
A new window will open showing you the details of the transaction. You will see the calculated details of the deal. You can see the details of the deal without products, and the how the numbers change when products are added.
Some of the items you have visibility to are:
Total Taxable Fees
Total Taxable Products
Total Tax Amount
Product Cost Per Month
NOTE: If you are having issues with your payments not matching, please reference the "Payments not Matching in Menu" article by clicking here.