August 15, 2026

Demurrage and Detention: What They Are and How to Avoid Them

Aerial view of a massive container port packed with stacked cargo containers, representing demurrage and storage charges for cargo sitting at port

Demurrage and detention charges catch importers off guard more than almost any other cost in the shipping process, mainly because they are rarely explained clearly until after they have already started accruing. Understanding what these charges actually are, and how free time works, is the difference between an avoidable expense and a normal part of shipping.

Three different charges, often confused

These terms get used loosely, but they refer to distinct things:

Demurrage is charged by the shipping line or terminal when a container sits in the port beyond its allotted free time, before you pick it up
Detention is charged when you keep the shipping line's container equipment outside the port beyond the allowed free time, for example while unloading it at your warehouse before returning the empty container
Storage is sometimes charged separately by the terminal itself for cargo occupying space in the yard, distinct from the shipping line's own demurrage charge

Depending on your shipment and terminal, you may encounter one, two, or all three of these as separate line items.

How free time works

Every shipping line and terminal allows a certain number of free days before these charges start, covering the period needed to clear customs and arrange pickup. The exact allowance varies by carrier, terminal, and sometimes by negotiated agreement, so there is no single fixed number that applies universally. What matters is knowing your specific free-time deadline for each shipment and treating it as a hard deadline, not a rough guideline.

Why these charges add up so easily

Free time starts counting from a fixed point, regardless of how quickly your paperwork or logistics are actually ready. If customs clearance at Chattogram Port takes longer than expected, or if arranging pickup and delivery takes a few extra days, the free-time clock keeps running the entire time. Charges are often billed per day and can escalate the longer a container sits, which is exactly why importers who are not actively tracking the deadline can end up with a larger bill than expected.

How to avoid unnecessary charges

Know your exact free-time deadline for every shipment, not just a general assumption, since it varies by carrier and terminal
Start customs clearance paperwork before the vessel even arrives, so clearance is not the bottleneck eating into your free time
Arrange pickup and inland transport in advance, so you are not scrambling to find a truck once cargo is cleared
Return empty containers promptly after unloading, since detention charges accrue separately from demurrage and are just as avoidable
Ask your freight forwarder to actively monitor your free-time deadline, rather than assuming you will be notified automatically

FAQ

Who actually charges demurrage and detention, the port or the shipping line?

It depends on the charge. Demurrage is typically charged by the shipping line for the container sitting in the terminal, while storage may be charged separately by the terminal operator. Detention is charged by the shipping line for the container itself being held outside the port.

Can free time be extended if I know I will need more time?

Sometimes, depending on the carrier and circumstances, but this needs to be requested and agreed before the free time expires, not after charges have already started.

Does tracking my shipment help avoid these charges?

Yes. Tracking your shipment closely around its arrival date helps you know exactly when your free-time clock starts, rather than discovering the deadline has already begun after the fact.

If you want a forwarder who actively tracks your free-time deadlines instead of leaving it to you, tell us about your shipment and we will manage the timeline.

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