Delivery duty unpaid (DDU) is a term that refers to goods being delivered without a seller having to pay duties and taxes. It means that the buyer is responsible for paying any duties and taxes due on the delivery.
A DDU shipment is typically used when shipping goods from one country to another, and the seller is not registered with the customs authority in the destination country. In this case, the seller cannot pay the duties and taxes on behalf of the buyer.
This is one of the most common delivery methods for e-commerce goods that are shipped to UK consumers. The consumer has to pay customs charges to the courier to receive the goods.