What is Demurrage?
Demurrage charges are levied by the shipping line (or the port) to the importer. When a vessel arrives and discharges its cargo, the terminal provides a set window of "free time" for the consignee or their freight forwarder to arrange customs clearance and truck pickup.
If the container sits at the terminal after the free time expires, demurrage fees are applied per container, per day. These fees can escalate rapidly, often increasing the longer the container remains on site.
Common Causes of Demurrage:
- Customs clearance delays or missing documentation.
- Port congestion preventing trucks from entering the terminal.
- Consignee lacking the warehouse space to accept the delivery immediately.
What is Detention?
Detention charges relate to the physical equipment (the container itself). Once the forwarder or consignee successfully picks up the full container from the port and drives it to the warehouse to be unloaded, the clock starts on detention free time.
If the empty container is not returned to the designated shipping line depot within the agreed timeframe, detention fees are charged per day.
Common Causes of Detention:
- Slow unloading processes at the importer's warehouse.
- Shortage of truck drivers to return the empty container.
- Consignee holding the container to use as temporary on-site storage.
Demurrage vs. Detention: Key Comparisons
To summarize the operational boundaries of these charges, use the table below:
| Charge Type | Location of Container | Status of Container | Primary Purpose of Fee |
|---|---|---|---|
| Demurrage | Inside the terminal / port | Full (loaded with cargo) | To free up physical space in congested ports. |
| Detention | Outside the terminal / port | Empty (usually after unloading) | To get the shipping line's equipment back into circulation. |
How to Avoid Demurrage and Detention Fees
For shippers and freight forwarders, avoiding these fees requires strict operational visibility. Pre-clearing customs while the vessel is still on the water, securing advanced trucking capacity, and maintaining a tight CRM pipeline for container tracking are the most effective ways to avoid thousands of pounds in margin-eroding penalties.
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