Apply VAT in N. Carolina customers

[panpan]

Hello there,

I'm trying to apply a tax calculation in VM2 for customers from N. Carolina. I add a new calculation and make the configuration there. After that I add a new customer from N. Carolina and I put the customer in A special Customer Group (N. Carolina). After that I apply the VAT in a couple of products. The problem is that every customer can see the VAT and not only customers from N. Carolina. Can anyone Help?

Thanks a lot.