I understand the add to cart form can take a parameter to disable tax on a product like so.. (although the docs seem to indicate it should be 'tax_exempt'?)
{exp:cartthrob:add_to_cart_form on_the_fly="y" no_tax="yes"}
I am using this to create phone orders but sometimes a product may not have tax so I was hoping to add a checkbox, something like this:
<input type="checkbox" name="no_tax" value="yes" />
Unfortunately this does not appear to work for me, just wondering if there are any undocumented features that will do what I want?