Demurrage and Detention: How Port Fees Pile Up and How to Stop the Clock

You cleared customs. The container is on the ground at the port. And then the invoice shows up: hundreds of dollars a day, climbing, for a box you thought you had time to deal with. If you’ve ever stared at a demurrage or detention bill and wondered how a shipment that arrived on time suddenly cost more than the freight, you’re not alone. These charges are some of the fastest-growing line items an importer sees, and most of them are avoidable.

Here’s how the clock actually works, and where you can stop it.

Demurrage versus detention: two different clocks

People use these words like they mean the same thing. They don’t, and knowing the difference tells you who to call and what to fix.

• Demurrage is charged when your loaded container sits inside the terminal past its free time. The port gives you a set number of free days to pick the box up. Once you burn through them, the terminal starts charging you daily for the ground it’s occupying.
• Detention is charged when you keep the container itself too long after it leaves the terminal. You pulled it, took it to your dock, and now the carrier wants their equipment back. Every day past the free window is a detention day.

One is about the space the box takes up at the port. The other is about the box being out in the world instead of back in the pool. Both run on a clock, and both keep charging until you act.

Why the fees pile up so fast

The charges are daily and they often step up. The first few days past free time might be one rate, and then it climbs. Miss a week and the rate you’re paying on day seven is not the rate you paid on day one. Now multiply that across several containers arriving in the same window, and the total gets ugly quickly.

A few things make it worse:

• Free time is shorter than you think. It runs on calendar days at many terminals, so a weekend and a holiday can eat most of it before you’ve done anything.
• Chassis and appointment shortages. You can’t pull a box without a chassis and a terminal appointment. When those are tight, your free time bleeds out while you wait for a slot.
• No plan for the box once it’s off the port. You get it to your yard, unload it when you can, and forget the detention clock is running the whole time.

How to stop the clock

The fix is almost always the same: get the box moving, and have a plan before it lands, not after.

1. Line up the drayage before the vessel arrives. Don’t wait for the container to hit the ground to start looking for a truck and a chassis. Book the move ahead of arrival so you’re pulling the box inside free time, not scrambling after it expires.
2. Unload fast and turn the equipment. Once the container is at your dock, the detention clock is ticking. Strip it and get it back, or move the freight off it so you’re not paying to store product in someone else’s box.
3. Transload instead of holding the box. This is the big one. Instead of dragging the ocean container all the way to your facility and sitting on it, you pull it to a nearby facility, break the freight out, and return the box quickly. Your freight moves on over-the-road equipment, and the carrier’s container goes home before detention stacks up.

Where a transload facility changes the math

Comet National runs an Atlanta transload facility built for exactly this handoff. We take freight off a rail or ocean container and put it on over-the-road trucks, and we cross-dock and stage it so nothing sits longer than it has to. The point is simple: the sooner that container empties and goes back, the sooner both clocks stop.

Transloading also opens up your options once the freight is on the ground. If it’s palletized dry or refrigerated freight, we can move it truckload, partial van, or LTL. If some of it is oversized or has to ride on a deck, that’s our house specialty, and small partial open-deck loads can go through our sister brand, FlatbedLTL, at flatbed.delcoe.com. One box in, the right modes out.

And because we’re a single point of contact, you’re not coordinating a drayage company, a warehouse, and three carriers on your own while the fees climb. One call, one team, one plan for the box.

The short version

Demurrage and detention aren’t penalties for doing something wrong. They’re penalties for the container sitting still. Plan the move before the vessel lands, get the box pulled inside free time, and transload the freight so the equipment turns fast. That’s how you keep a clean freight cost from turning into a surprise bill.

If you’ve got containers coming into the Southeast and you’re tired of watching the clock run, call Comet about our Atlanta transload facility, or ask us to look at how your import freight is flowing. We’ll tell you where the time is leaking out.