Salon Maid Software HOW TO CHANGE THE TAX?

You change the tax by going to "Inventory" > "Fill, Update or Delete in Inventory", typing in a product's ItemID that the tax change needs to apply for, then tab away to a different field so that the rest of the fields will be filled in and then simply change the tax field's number and click "Update".
 
Also please remember that you do not need to change the tax for each item, one by one, for all of your items in inventory, you only need to do this class by class, in other words for one item per class.
The classes' sales tax is always the same for all the items in that class.  If you have more than one item in a certain class, after you change the tax for any one item in it and click update, that tax will update to whatever you have changed it to for all the items in this class (for the entire class).  In other words all the products in one class regardless if there are two products or two thousand products, will always have the same tax.  If food is not taxable in your state by law, than everything that belongs to the class food will not be taxable or in other words will have the same tax of 0%.  Two items can not belong to the same class and be taxed at a different rate.  As soon as you change the tax of one item in inventory, that change takes affect for the rest of the items in inventory that belong to the same class as that item.