I am new to Magento and trying to setup Tax Rules based upon certain product combinations in the basket.
There are three possible tax valuations that I am trying to apply:
STANDARD which is 20% and applied to all "default" users and products.
ZERO which is 0% applied to products with the "Assistive" class and applies only to "Registered" users.
COMPOSITE which is 4% and only applies when "Assistive" class products are chosen with "Hardware" class and "Installation" class products. 1 and 2 are standard tax rules and have been setup. What I am having difficulty working out is how to create a tax rule which requires more than one Product Class for it to apply.
Is this possible with the core Magento or would it require an additional extension?
Unfortunately, this isn't possible in native Magento. You can make a tax rule that applies the same rate to more than one class but there is no way to make a rule that applies ONLY when a combination of classes is in the cart. You'll need to customize Magento or find an extension that supports this.
One possible workaround could be to create fixed-priced bundled products containing the product combinations and assign the bundles to your 4% tax class. However, this will really limit the ways in which the products can be combined and very well might not be suited to your catalog.
Thanks for your reply. I had a feeling this would be the case and I'm looking into extensions to find a solution. The bundled products approach would be too constrictive to the catalog I'm afraid.