Ocean freight can look cheap on the quote and expensive on the final invoice. The difference is often demurrage and detention, two charges that start when containers are not collected or returned on time.
Demurrage vs detention
- Demurrage is charged by the shipping line or terminal when a full container stays in the terminal beyond the free time
- Detention is charged when the container is outside the terminal, such as at your warehouse, beyond the free time for returning it empty
Free time is typically measured in days and varies by carrier, port and container type. After it ends, daily rates are charged and can rise in steps the longer the container stays out.
What usually causes the charges
- Customs holds caused by missing or inconsistent documents
- Late payment of freight or duties, which delays the release of cargo
- No delivery slot at the warehouse, or no unloading crew
- Congestion at the port or empty-return depot
- Weekends and public holidays, which often still count toward free time
How to avoid them
- Check the free days on your booking before the vessel sails
- Prepare customs documents before arrival, not after
- Book delivery and unloading early
- Ask your forwarder for the container’s last free day and track it
- Return the empty container promptly
Our team monitors arrival dates and free time on every shipment and warns you before charges begin. See how our customs clearance service prepares documents in advance.