On the SalesVu app for iOS devices (iPad, iPhone, & iPod Touch) you can use the 'Remove Tax' button to remove the tax from the total charged to your customer.
See the instructions below,
1. Add products to your order
2. Next the order number above the order details there is a '+' button that allows you to expand the order detail further. If it is in the '+' state touch it, if it is already in the '-' state please move to step 3
3. Touch the 'Remove' button at the bottom of the order detail next to 'Tax'
4. An alert will appear that says, 'Do you want to remove tax?' touch 'Yes'
The tax will now be removed from this order.