If it's ordered before Sub-Total, then it's trying to calculate taxes without a sub-total (i.e. on a 0.00 cart total). You need to always have Sub-Total be first, and Total be last. Audacity
Also, if you have Taxes before Shipping, then it's not going to add in any tax on the shipping, Find My iPhone since the shipping will be calculated *after* the taxes. Origin You need to have the order of the Order Totals as they would be calculated.