After figuring out how to charge tax for only one state , I then needed to include the shipping in the taxable amount.
When I used the calculated field ( ({EMT Code Membership:30} + {Shipping:28} ) * .07 ) in Gravity Forms, the total would not refresh. I looked in the javascript for Gravity Forms and found the function gformCalculateTotalPrice($form_id). I added this function call to my jQuery code using my form ID and all is well. It calculates the tax and adds it to the total as expected.
jQuery(document).ready(function($) { $('#field_5_38').hide(); $('#input_5_25_4').change(function() { var state = $(this).val(); state = state.toLowerCase(); if (state == 'fl' || state == 'florida') { $('#field_5_38').show(); gformCalculateTotalPrice('5'); } else { $('#field_5_38').hide(); gformCalculateTotalPrice('5'); } }); $('#choice_30_0').change(function() { var state = $('#input_5_25_4').val(); state = state.toLowerCase(); if (state == 'fl' || state == 'florida') { $('#field_5_38').show(); gformCalculateTotalPrice('5'); } }); $('#choice_30_1').change(function() { var state = $('#input_5_25_4').val(); state = state.toLowerCase(); if (state == 'fl' || state == 'florida') { $('#field_5_38').show(); gformCalculateTotalPrice('5'); } }); });