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Demurrage and detention are both daily charges tied to shipping containers, and they are constantly confused because they are both about time. The difference is where the container is and what state it is in.
Demurrage is the charge for a container that sits inside the terminal past its allotted free time. Your box is available to pick up, you have not picked it up, and the terminal is charging you rent for the space it is occupying. The clock starts when free time expires.
Detention is the charge for keeping the container too long after you have taken it out of the terminal. You pulled the box, you are unloading it at your warehouse, and you are holding the carrier's equipment longer than the free period allows. The clock is on the equipment, not the terminal space.
A simple way to remember it: demurrage is "the box is still at the port"; detention is "the box left the port and you're sitting on it."
Neither charge is trivial, and they compound. Demurrage and detention accrue per container, per day, often at rates that escalate the longer the delay runs. At a busy port, a single container caught in a chassis shortage or a missed appointment can rack up hundreds of dollars a day, and importers have faced five-figure bills when multiple containers stalled at once.
There is often a related charge called per diem, the daily fee on the container or chassis equipment itself, which can overlap with detention depending on how the carrier structures it. The exact terms, free-time windows, and rates vary by terminal and carrier, which is part of why these fees catch people out — there is no single universal number to memorize.
The common thread is that all of them are penalties for the container not moving on schedule. They are avoidable, but only with planning.
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Beating demurrage means moving fast at the front end: track the container, know exactly when it becomes available, book the terminal appointment immediately, have the chassis lined up, and get a driver to the gate before free time runs out. Beating detention means being ready at the back end: have the dock, the labor, and the schedule set so the container is unloaded and returned quickly instead of parked at your warehouse for days.
A drayage operator who knows the Port of NY/NJ schedules the pickup tight against the free-time window and manages the equipment so the box keeps moving. Xentra Transport handles drayage out of Newark and Elizabeth and the freight legs beyond — see our Port Newark drayage guide for the full process. Call 877-709-2711 with your container and terminal details and we will move it before the clocks become a bill.
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