@yujyuj, hashtrash and wahuka, I am so sorry that I missed your messages. Allow me to explain that we charge 21% VAT for packages to Spain.
Our item price includes item-unit price and shipping fee. The VAT tax does not apply to the shipping portion but only applies to the unit price. For example, for Item
SKU 9756438, the item-total price is $28.68. We separated the price into two parts: the unit price of $14.76 and shipping of $13.92. The VAT is charged based on the unit price of $14.76: $14.76*21%= $3.10. You can check the details from the order invoice:

The VAT tax we charged looks to be lower. But we declare it at the correct tax rate.
If you would like to have the VAT applied based on the total amount of your order, please feel free to contact us by
the service ticket. Thank you.