Demurrage and detention charges are two of the most common ways a shipment quietly erodes its own margin — fees that accrue simply because a container sat somewhere too long. Understanding exactly what triggers each one is the difference between a minor line item and an unpleasant invoice.
What Demurrage Actually Charges For
Demurrage is charged by the shipping line for a container sitting at the port or terminal beyond the agreed free time, before it has even left the terminal. It is a port-side charge, tied to how long the container occupies terminal space.
What Detention Actually Charges For
Detention is charged for a container held outside the port — at your warehouse or an inland location — beyond the agreed free time, before it is returned empty to the carrier. It is the equivalent charge for the period after the container leaves the terminal.
Why Both Happen
Most demurrage and detention charges trace back to delays in customs clearance, incomplete or inconsistent documentation, or simply underestimating how long unloading and return logistics will take at the destination. Free time is usually short — often just a handful of days — and charges escalate the longer a container overstays.
How to Avoid Them
Preparing customs documentation before the vessel arrives rather than after, tracking free-time deadlines actively rather than reactively, and having unloading and return logistics arranged in advance are the practical steps that keep these charges from accumulating. This is exactly the kind of coordination gap that causes costly delays on complex routes like the Turkey–Central Asia corridor.
Who Bears the Cost
Responsibility for demurrage and detention should be addressed explicitly in the sales contract, since the party controlling customs clearance and inland logistics is usually the one best positioned to avoid the charge — and the one who should bear it if it occurs through their delay.
Keeping Containers Moving
We actively track free-time deadlines and coordinate customs and delivery logistics to keep demurrage and detention exposure to a minimum. Explore our trade and logistics services or book a discovery call.
Frequently Asked Questions
What is the difference between demurrage and detention?
Demurrage is charged for a container sitting at the port or terminal beyond free time, before leaving the terminal. Detention is charged for a container held outside the port — such as at your warehouse — beyond free time, before it’s returned empty.
What usually causes demurrage and detention charges?
Delays in customs clearance, incomplete or inconsistent documentation, and underestimating how long unloading and return logistics will take at the destination are the most common causes.
Who should be responsible for demurrage and detention charges in a contract?
This should be addressed explicitly in the sales contract, typically assigned to the party controlling customs clearance and inland logistics, since they are best positioned to avoid the charge.