You are asking since you purchased a RX6800XT at AMD Store in USA that if you will need to pay "CUSTOMS" or "duty" when it is shipped to you in Italy?
I needed to translate Dogane which means "Customs" in Italian.
Here is AMD Store FAQ concerning paying Taxes: https://www.amd.com/en/support/kb/faq/amdonlinestorefaq
I guess it depends on what type of VAT AMD Charges.
Here is all the information about purchasing from Non-European to EU Countries and whether you need to pay Custom/Duties and VAT and other fees (Official EU Website): https://ec.europa.eu/taxation_customs/individuals/buying-goods-services-online-personal-use/buying-g...
EDIT: You can ask AMD Support and see if they can answer your question or not from here: https://www.amd.com/en/support/contact-email-form