Magento Open Source, 1.9.x

Order Review

During Order Review, the total appears at the bottom of the order, with any adjustments for discounts, gift cards, shipping charges, store credit, and tax. The order of each item determines the sequence of the calculations, and is set by a number that is assigned to each item. for example, the Subtotal is the first item in the section, and is assigned a value of 10. The Grand Total appears last, and is assigned a value of 100. All of the other items in the totals section are assigned a value between the first and the last.

Checkout Totals

To configure the checkout totals:

1. On the Admin menu, select System > Configuration. Then in the panel on the left under Sales, choose Sales.
2. Click to expand the Checkout Totals Sort Order section.
3. Change the number assigned to each item to determine its order in the Totals section..
4. When complete, click the Save Config button.