Big problem with VAT in invoice

Hi, first of all, sorry for my english, I'm spanish man, and I don't speak and write very well in english. Sorry.

Now my question. I make a online shop with ZenCart, but when I see if it works, with my user, all works fine. Then when some people register in the shop, and the buy, and the ZenCart shop sends the invoice, the price of the articles appears with out VAT, in Spain IVA. And then the INVOICE appears without all VAT, and the ZenCart make Invoice without VAT. I checked all the users, my user and all else is equal, the Zone is the same, only one (Spain), only one VAT is declarated, and the articles are fine.

Client e-mail

My e-mail

Please, if you have any idea, answer this Thread, I'm desperate.

The VAT tax (IVA) in Spain is 16%

Thanks for all, and again sorry for my english. I hope everything is understood.

It's quite simple. You have to activate ot_tax module. This module is in
Modules -> order Total -->

But remember: it will works only for new orders.