If non-blank, enables automatic addition of sales tax based on the order form. The value is one of three types of values:
The special value "multi" enables table-based lookup of taxing rates based on the value of user form values, by default country and state.
If the value has a left square bracket, it is interpolated for ITL tags and the result used as the amount of the salestax.
A comma-separated list of the field names (as placed in the checkout page, for example ord/checkout.html) in priority order. These are be used to look up sales tax percentage in the salestax.asc ASCII table. (This table is not supplied with Interchange.)
SalesTax zip state