The International Chamber of Commerce (ICC) has developed several publications providing sellers and buyers with guidance on the use of Incoterms 2010. My favorite is Incoterms rules, Publication No. 715e.
According to the ICC, Delivered Duty Paid (DDP) means:
[T]he seller delivers the goods when the goods are placed at the disposal of the buyer, cleared for import on the arriving means of transport, ready for unloading at the named place of destination. The seller bears all the costs and risks involved in bringing the goods to the place of destination and has an obligation to clear the goods not only for export but also for import, to pay any duty for both export and import and to carry out all customs formalities.
The ICC was succinct in its description of obligations for the seller in this paragraph. However, there’s more detail to consider for the seller and for the buyer when establishing a contract that references DDP.