What it is
Special customs procedures (besondere Verfahren) are the toolkit the Union Customs Code gives you to import, store, process or temporarily use goods without paying the full duty and VAT up front. Inward processing (aktive Veredelung), outward processing (passive Veredelung), customs warehousing (Zolllager), end-use and temporary admission each follow their own rules, each need their own authorisation, and each demand their own stock records and discharge logic. Used well, they are the single biggest legal duty-saving instrument inside the EU customs system.