I see others have had a similar problem with the tax function and i was hoping you could help:
I'm trying to add a tax (5%) to anyone paying with paypal. No tax is added with other payment methods.
I've created a tax rule (and also tried with extended rule) but the cart will not update the tax after the details page.
I can add tax to the products individually but it simply will not update with the payment method.
I have tried all manner of configurations but nothing will work.