On anything you buy here or for the maintenance of the vessel, you always have to pay VAT in the EU. If you have a Temporary Import Permit, you can sail freely in the EU for 18 months. After those 18 months, you must temporarily leave the EU and report back to Customs upon arrival. You can then get another permit. Provided you still meet the conditions. De totale tijd is beperkt tot 10 jaar. See https://ec.europa.eu/taxation_customs/system/files/2018-04/rules_for_private_boats-faq_en.pdf